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• Configure PERL DBI and DBD in Linux

  - by Balualways

  I am new to Perl and I work in a Linux OEL 5x server. I am trying to configure the Perl DB modules for Oracle connectivity (DBD and DBI modules). Can anyone help me out in the installation procedure? I had tried CPAN didn't really worked out. Any help would be appreciated. I am not quite sure I need to initialize any variables other than $LD_LIBRARY_PATH and $ORACLE_HOME These are my observations: ISSUE:: I am getting the following issue while using the DBI module to connect to Oracle: install_driver(Oracle) failed: Can't locate loadable object for module DBD::Oracle in @INC (@INC contains: /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8 .) at (eval 3) line 3 Compilation failed in require at (eval 3) line 3. Perhaps a module that DBD::Oracle requires hasn't been fully installed at connectdb.pl line 57 I had installed the DBD for oracle from /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/DBD/DBD-Oracle-1.50 Could you please take a look into the steps and correct me if I am wrong: Observations: $ echo $LD_LIBRARY_PATH /opt/CA/UnicenterAutoSysJM/autosys/lib:/opt/CA/SharedComponents/Csam/SockAdapter/lib:/opt/CA/SharedComponents/ETPKI/lib:/opt/CA/CAlib $ echo $ORACLE_HOME /usr/local/oracle/ORA This is how I tried to install the DBD module: Download the file DBD 1.50 for Oracle Copy to /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/DBD Untar and Makefile.PL . Message: Using DBI 1.52 (for perl 5.008008 on x86_64-linux-thread-multi) installed in /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi/auto/DBI/ Configuring DBD::Oracle for perl 5.008008 on linux (x86_64-linux-thread-multi) Remember to actually *READ* the README file! Especially if you have any problems. Installing on a linux, Ver#2.6 Using Oracle in /opt/oracle/product/10.2 DEFINE _SQLPLUS_RELEASE = "1002000400" (CHAR) Oracle version 10.2.0.4 (10.2) Found /opt/oracle/product/10.2/rdbms/demo/demo_rdbms.mk Found /opt/oracle/product/10.2/rdbms/demo/demo_rdbms64.mk Found /opt/oracle/product/10.2/rdbms/lib/ins_rdbms.mk Using /opt/oracle/product/10.2/rdbms/demo/demo_rdbms.mk Your LD_LIBRARY_PATH env var is set to '/usr/local/oracle/ORA/lib:/usr/dt/lib:/usr/openwin/lib:/usr/local/oracle/ORA/ows/cartx/wodbc/1.0/util/lib:/usr/local/oracle/ORA/lib:/usr/local/sybase/OCS-12_0/lib:/usr/local/sybase/lib:/home/oracle/jdbc/jdbcoci73/lib:./' WARNING: Your LD_LIBRARY_PATH env var doesn't include '/opt/oracle/product/10.2/lib' but probably needs to. Reading /opt/oracle/product/10.2/rdbms/demo/demo_rdbms.mk Reading /usr/local/oracle/ORA/rdbms/lib/env_rdbms.mk Attempting to discover Oracle OCI build rules sh: make: command not found by executing: [make -f /opt/oracle/product/10.2/rdbms/demo/demo_rdbms.mk build ECHODO=echo ECHO=echo GENCLNTSH='echo genclntsh' CC=true OPTIMIZE= CCFLAGS= EXE=DBD_ORA_EXE OBJS=DBD_ORA_OBJ.o] WARNING: Oracle build rule discovery failed (32512) Add path to make command into your PATH environment variable. Oracle oci build prolog: [sh: make: command not found] Oracle oci build command: [] WARNING: Unable to interpret Oracle build commands from /opt/oracle/product/10.2/rdbms/demo/demo_rdbms.mk. (Will continue by using fallback approach.) Please report this to [email protected]. See README for what to include. Found header files in /opt/oracle/product/10.2/rdbms/public. client_version=10.2 DEFINE= -Wall -Wno-comment -DUTF8_SUPPORT -DORA_OCI_VERSION=\"10.2.0.4\" -DORA_OCI_102 Checking for functioning wait.ph System: perl5.008008 linux ca-build9.us.oracle.com 2.6.20-1.3002.fc6xen #1 smp thu apr 30 18:08:39 pdt 2009 x86_64 x86_64 x86_64 gnulinux Compiler: gcc -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -Wdeclaration-after-statement -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm Linker: not found Sysliblist: -ldl -lm -lpthread -lnsl -lirc Oracle makefiles would have used these definitions but we override them: CC: cc CFLAGS: $(GFLAG) $(OPTIMIZE) $(CDEBUG) $(CCFLAGS) $(PFLAGS)\ $(SHARED_CFLAG) $(USRFLAGS) [$(GFLAG) -O3 $(CDEBUG) -m32 $(TRIGRAPHS_CCFLAGS) -fPIC -I/usr/local/oracle/ORA/rdbms/demo -I/usr/local/oracle/ORA/rdbms/public -I/usr/local/oracle/ORA/plsql/public -I/usr/local/oracle/ORA/network/public -DLINUX -D_GNU_SOURCE -D_LARGEFILE64_SOURCE=1 -D_LARGEFILE_SOURCE=1 -DSLTS_ENABLE -DSLMXMX_ENABLE -D_REENTRANT -DNS_THREADS -fno-strict-aliasing $(LPFLAGS) $(USRFLAGS)] build: $(CC) $(ORALIBPATH) -o $(EXE) $(OBJS) $(OCISHAREDLIBS) [ cc -L$(LIBHOME) -L/usr/local/oracle/ORA/rdbms/lib/ -o $(EXE) $(OBJS) -lclntsh $(EXPDLIBS) $(EXOSLIBS) -ldl -lm -lpthread -lnsl -lirc -ldl -lm $(USRLIBS) -lpthread] LDFLAGS: $(LDFLAGS32) [-m32 -o $@ -L/usr/local/oracle/ORA/rdbms//lib32/ -L/usr/local/oracle/ORA/lib32/ -L/usr/local/oracle/ORA/lib32/stubs/] Linking with /usr/local/oracle/ORA/rdbms/lib/defopt.o -lclntsh -ldl -lm -lpthread -lnsl -lirc -ldl -lm -lpthread [from $(DEF_OPT) $(OCISHAREDLIBS)] Checking if your kit is complete... Looks good LD_RUN_PATH=/usr/local/oracle/ORA/lib Using DBD::Oracle 1.50. Using DBD::Oracle 1.50. Using DBI 1.52 (for perl 5.008008 on x86_64-linux-thread-multi) installed in /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi/auto/DBI/ Writing Makefile for DBD::Oracle Writing MYMETA.yml and MYMETA.json *** If you have problems... read all the log printed above, and the README and README.help.txt files. (Of course, you have read README by now anyway, haven't you?)

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• C++: Declaration of template class member specialization

  - by Ziv

  When I specialize a (static) member function/constant in a template class, I'm confused as to where the declaration is meant to go. Here's an example of what I what to do - yoinked directly from IBM's reference on template specialization: ===IBM Member Specialization Example=== template<class T> class X { public: static T v; static void f(T); }; template<class T> T X<T>::v = 0; template<class T> void X<T>::f(T arg) { v = arg; } template<> char* X<char*>::v = "Hello"; template<> void X<float>::f(float arg) { v = arg * 2; } int main() { X<char*> a, b; X<float> c; c.f(10); // X<float>::v now set to 20 } The question is, how do I divide this into header/cpp files? The generic implementation is obviously in the header, but what about the specialization? It can't go in the header file, because it's concrete, leading to multiple definition. But if it goes into the .cpp file, is code which calls X::f() aware of the specialization, or might it rely on the generic X::f()? So far I've got the specialization in the .cpp only, with no declaration in the header. I'm not having trouble compiling or even running my code (on gcc, don't remember the version at the moment), and it behaves as expected - recognizing the specialization. But A) I'm not sure this is correct, and I'd like to know what is, and B) my Doxygen documentation comes out wonky and very misleading (more on that in a moment a later question). What seems most natural to me would be something like this, declaring the specialization in the header and defining it in the .cpp: ===XClass.hpp=== #ifndef XCLASS_HPP #define XCLASS_HPP template<class T> class X { public: static T v; static void f(T); }; template<class T> T X<T>::v = 0; template<class T> void X<T>::f(T arg) { v = arg; } /* declaration of specialized functions */ template<> char* X<char*>::v; template<> void X<float>::f(float arg); #endif ===XClass.cpp=== #include <XClass.hpp> /* concrete implementation of specialized functions */ template<> char* X<char*>::v = "Hello"; template<> void X<float>::f(float arg) { v = arg * 2; } ...but I have no idea if this is correct. Any ideas? Thanks much, Ziv

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• About the MSDN NOTIFYICONDATA's cbSize member

  - by KenC

  Hi, I am reading the NOTIFYICONDATA documentation in MSDN. It says the NOTIFYICONDATA structure has a cbSize member should be set to the size of the structure, but NOTIFYICONDATA structure's size has different size in every Shell32.dll, so you should get the Shell32.dll version before setting cbSize. The following quotes from MSDN: If it is version 5.0 or later, initialize the cbSize member as follows. nid.cbSize = sizeof(NOTIFYICONDATA); Setting cbSize to this value enables all the version 5.0 and 6.0 enhancements. For earlier versions, the size of the pre-6.0 structure is given by the NOTIFYICONDATA_V2_SIZE constant and the pre-5.0 structure is given by the NOTIFYICONDATA_V1_SIZE constant. Initialize the cbSize member as follows. nid.cbSize = NOTIFYICONDATA_V2_SIZE; Using this value for cbSize will allow your application to use NOTIFYICONDATA with earlier Shell32.dll versions, although without the version 6.0 enhancements. I found it a bit of vague, because 'sizeof(NOTIFYICONDATA)' has different value in Win98 (using Shell32.dll version 4.x), Win2K (version 5.0) and WinXP (version 6.0). How could it 'enable all version 5.0 and 6.0 enhancements'? So I looked for the definition of NOTIFYICONDATA_V1_SIZE (source code as below), I see: NOTIFYICONDATA_V1_SIZE is for Win 2K (doesn't include 2K) NOTIFYICONDATA_V2_SIZE is for Win XP NOTIFYICONDATA_V3_SIZE is for Vista (not sure if I am right) It's completely different from what MSDN says? and none for Win2K? So, I am totaly confused right now. How should I set the cbSize member according to Shell32.dll version? Could anybody help me... Thanks in advance. //= = = = = = = = ShellAPI.h = = = = = = = = typedef struct _NOTIFYICONDATAA { DWORD cbSize; HWND hWnd; UINT uID; UINT uFlags; UINT uCallbackMessage; HICON hIcon; #if (NTDDI_VERSION < NTDDI_WIN2K) CHAR szTip[64]; #endif #if (NTDDI_VERSION >= NTDDI_WIN2K) CHAR szTip[128]; DWORD dwState; DWORD dwStateMask; CHAR szInfo[256]; union { UINT uTimeout; UINT uVersion; // used with NIM_SETVERSION, values 0, 3 and 4 } DUMMYUNIONNAME; CHAR szInfoTitle[64]; DWORD dwInfoFlags; #endif #if (NTDDI_VERSION >= NTDDI_WINXP) GUID guidItem; #endif #if (NTDDI_VERSION >= NTDDI_VISTA) HICON hBalloonIcon; #endif } NOTIFYICONDATAA, *PNOTIFYICONDATAA; typedef struct _NOTIFYICONDATAW { DWORD cbSize; HWND hWnd; UINT uID; UINT uFlags; UINT uCallbackMessage; HICON hIcon; #if (NTDDI_VERSION < NTDDI_WIN2K) WCHAR szTip[64]; #endif #if (NTDDI_VERSION >= NTDDI_WIN2K) WCHAR szTip[128]; DWORD dwState; DWORD dwStateMask; WCHAR szInfo[256]; union { UINT uTimeout; UINT uVersion; // used with NIM_SETVERSION, values 0, 3 and 4 } DUMMYUNIONNAME; WCHAR szInfoTitle[64]; DWORD dwInfoFlags; #endif #if (NTDDI_VERSION >= NTDDI_WINXP) GUID guidItem; #endif #if (NTDDI_VERSION >= NTDDI_VISTA) HICON hBalloonIcon; #endif } NOTIFYICONDATAW, *PNOTIFYICONDATAW; #define NOTIFYICONDATAA_V1_SIZE FIELD_OFFSET(NOTIFYICONDATAA, szTip[64]) #define NOTIFYICONDATAW_V1_SIZE FIELD_OFFSET(NOTIFYICONDATAW, szTip[64]) #ifdef UNICODE #define NOTIFYICONDATA_V1_SIZE NOTIFYICONDATAW_V1_SIZE #else #define NOTIFYICONDATA_V1_SIZE NOTIFYICONDATAA_V1_SIZE #endif #define NOTIFYICONDATAA_V2_SIZE FIELD_OFFSET(NOTIFYICONDATAA, guidItem) #define NOTIFYICONDATAW_V2_SIZE FIELD_OFFSET(NOTIFYICONDATAW, guidItem) #ifdef UNICODE #define NOTIFYICONDATA_V2_SIZE NOTIFYICONDATAW_V2_SIZE #else #define NOTIFYICONDATA_V2_SIZE NOTIFYICONDATAA_V2_SIZE #endif #define NOTIFYICONDATAA_V3_SIZE FIELD_OFFSET(NOTIFYICONDATAA, hBalloonIcon) #define NOTIFYICONDATAW_V3_SIZE FIELD_OFFSET(NOTIFYICONDATAW, hBalloonIcon) #ifdef UNICODE #define NOTIFYICONDATA_V3_SIZE NOTIFYICONDATAW_V3_SIZE #else #define NOTIFYICONDATA_V3_SIZE NOTIFYICONDATAA_V3_SIZE #endif (Seems like the code doesn't look good on the web site, but it from ShellAPI.h, all the same)

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• Why do I get the error "Only antlib URIs can be located from the URI alone,not the URI" when trying to run hibernate tools in my build.xml

  - by Casbah

  I'm trying to run hibernate tools in an ant build to generate ddl from my JPA annotations. Ant dies on the taskdef tag. I've tried with ant 1.7, 1.6.5, and 1.6 to no avail. I've tried both in eclipse and outside. I've tried including all the hbn jars in the hibernate-tools path and not. Note that I based my build file on this post: http://stackoverflow.com/questions/281890/hibernate-jpa-to-ddl-command-line-tools I'm running eclipse 3.4 with WTP 3.0.1 and MyEclipse 7.1 on Ubuntu 8. Build.xml: <project name="generateddl" default="generate-ddl"> <path id="hibernate-tools"> <pathelement location="../libraries/hibernate-tools/hibernate-tools.jar" /> <pathelement location="../libraries/hibernate-tools/bsh-2.0b1.jar" /> <pathelement location="../libraries/hibernate-tools/freemarker.jar" /> <pathelement location="../libraries/jtds/jtds-1.2.2.jar" /> <pathelement location="../libraries/hibernate-tools/jtidy-r8-20060801.jar" /> </path> <taskdef classname="org.hibernate.tool.ant.HibernateToolTask" classpathref="hibernate-tools"/> <target name="generate-ddl" description="Export schema to DDL file"> <!-- compile model classes before running hibernatetool --> <!-- task definition; project.class.path contains all necessary libs <taskdef name="hibernatetool" classname="org.hibernate.tool.ant.HibernateToolTask" classpathref="project.class.path" /> --> <hibernatetool destdir="sql"> <!-- check that directory exists --> <jpaconfiguration persistenceunit="default" /> <classpath> <dirset dir="WebRoot/WEB-INF/classes"> <include name="**/*"/> </dirset> </classpath> <hbm2ddl outputfilename="schemaexport.sql" format="true" export="false" drop="true" /> </hibernatetool> </target> Error message (ant -v): Apache Ant version 1.7.0 compiled on December 13 2006 Buildfile: /home/joe/workspace/bento/ant-generate-ddl.xml parsing buildfile /home/joe/workspace/bento/ant-generate-ddl.xml with URI = file:/home/joe/workspace/bento/ant-generate-ddl.xml Project base dir set to: /home/joe/workspace/bento [antlib:org.apache.tools.ant] Could not load definitions from resource org/apache/tools/ant/antlib.xml. It could not be found. BUILD FAILED /home/joe/workspace/bento/ant-generate-ddl.xml:12: Only antlib URIs can be located from the URI alone,not the URI at org.apache.tools.ant.taskdefs.Definer.execute(Definer.java:216) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105) at org.apache.tools.ant.Task.perform(Task.java:348) at org.apache.tools.ant.Target.execute(Target.java:357) at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:140) at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.parseBuildFile(InternalAntRunner.java:191) at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.run(InternalAntRunner.java:400) at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.main(InternalAntRunner.java:137) Total time: 195 milliseconds

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• Postfix configuration - Uing virtual min but server is bouncing back my mail.

  - by brodiebrodie

  I have no experience in setting up postfix, and thought virtualmin minght do the legwork for me. Appears not. When I try to send mail to the domain (either [email protected] [email protected] or [email protected]) I get the following message returned This is the mail system at host dedq239.localdomain. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to <postmaster> If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system <[email protected]> (expanded from <[email protected]>): User unknown in virtual alias table Final-Recipient: rfc822; [email protected] Original-Recipient: rfc822;[email protected] Action: failed Status: 5.0.0 Diagnostic-Code: X-Postfix; User unknown in virtual alias table How can I diagnose the problem here? It seems that the mail gets to my server but the server fails to locally deliver the message to the correct user. (This is a guess, truthfully I have no idea what is happening). I have checked my virtual alias table and it seems to be set up correctly (I can post if this would be helpful). Can anyone give me a clue as to the next step? Thanks alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases broken_sasl_auth_clients = yes command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix debug_peer_level = 2 html_directory = no local_recipient_maps = $virtual_mailbox_maps mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain myorigin = $mydomain newaliases_path = /usr/bin/newaliases.postfix readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES sample_directory = /usr/share/doc/postfix-2.3.3/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtpd_recipient_restrictions = permit_mynetworks reject_unauth_destination smtpd_sasl_auth_enable = yes soft_bounce = no unknown_local_recipient_reject_code = 550 virtual_alias_maps = hash:/etc/postfix/virtual My mail log file (the last entry) Sep 30 15:13:47 dedq239 postfix/cleanup[7237]: 207C6B18158: message-id=<[email protected]> Sep 30 15:13:47 dedq239 postfix/qmgr[7177]: 207C6B18158: from=<[email protected]>, size=1805, nrcpt=1 (queue active) Sep 30 15:13:47 dedq239 postfix/error[7238]: 207C6B18158: to=<[email protected]>, orig_to=<[email protected]>, relay=none, delay=0.64, delays=0.61/0.01/0/0.02, dsn=5.0.0, status=bounced (User unknown in virtual alias table) Sep 30 15:13:47 dedq239 postfix/cleanup[7237]: 8DC13B18169: message-id=<[email protected]> Sep 30 15:13:47 dedq239 postfix/qmgr[7177]: 8DC13B18169: from=<>, size=3691, nrcpt=1 (queue active) Sep 30 15:13:47 dedq239 postfix/bounce[7239]: 207C6B18158: sender non-delivery notification: 8DC13B18169 Sep 30 15:13:47 dedq239 postfix/qmgr[7177]: 207C6B18158: removed Sep 30 15:13:48 dedq239 postfix/smtp[7240]: 8DC13B18169: to=<[email protected]>, relay=gmail-smtp-in.l.google.com[209.85.216.55]:25, delay=1.3, delays=0.02/0.01/0.58/0.75, dsn=2.0.0, status=sent (250 2.0.0 OK 1254348828 36si15082901pxi.91) Sep 30 15:13:48 dedq239 postfix/qmgr[7177]: 8DC13B18169: removed Sep 30 15:14:17 dedq239 postfix/smtpd[7233]: disconnect from mail-bw0-f228.google.com[209.85.218.228] etc.aliases file below I have not touched this file - myvirtualdomain is a replacement for my real domain name # Aliases in this file will NOT be expanded in the header from # Mail, but WILL be visible over networks or from /bin/mail. # # >>>>>>>>>> The program "newaliases" must be run after # >> NOTE >> this file is updated for any changes to # >>>>>>>>>> show through to sendmail. # # Basic system aliases -- these MUST be present. mailer-daemon: postmaster postmaster: root # General redirections for pseudo accounts. bin: root daemon: root adm: root lp: root sync: root shutdown: root halt: root mail: root news: root uucp: root operator: root games: root gopher: root ftp: root nobody: root radiusd: root nut: root dbus: root vcsa: root canna: root wnn: root rpm: root nscd: root pcap: root apache: root webalizer: root dovecot: root fax: root quagga: root radvd: root pvm: root amanda: root privoxy: root ident: root named: root xfs: root gdm: root mailnull: root postgres: root sshd: root smmsp: root postfix: root netdump: root ldap: root squid: root ntp: root mysql: root desktop: root rpcuser: root rpc: root nfsnobody: root ingres: root system: root toor: root manager: root dumper: root abuse: root newsadm: news newsadmin: news usenet: news ftpadm: ftp ftpadmin: ftp ftp-adm: ftp ftp-admin: ftp www: webmaster webmaster: root noc: root security: root hostmaster: root info: postmaster marketing: postmaster sales: postmaster support: postmaster # trap decode to catch security attacks decode: root # Person who should get root's mail #root: marc abuse-myvirtualdomain.com: [email protected] My etc/postfix/virtual file is below - again myvirtualdomain is a replacement. I think this file was generated by Virtualmin and I have tried messing around with is with no success... This is the version without my changes. myunixusername@myvirtualdomain .com myunixusername myvirtualdomain .com myvirtualdomain.com [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected]

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• Android Dev Help: Saving an image from Res/raw or Asset folder to the Sd card

  - by Lucy

  Android Development Query Hello, I wonder if anyone could help me, i am trying to save an image (jpg or png) from the res/raw or assets folder to the SD card location (/sdcard/DCIM/). I have been following a tutorial which can save an image from a URL to the SD card Root, but i have looked everywhere to be able to save from res/raw or asset folder instead, and to a differnet location onthe sd card /sdcard/DCIM/ Here is the code, can anyone show me how to do the above from this? Thanks Lucy public class home extends Activity { private File file; private String imgNumber; private Button btnDownload; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btnDownload=(Button)findViewById(R.id.btnDownload); btnDownload.setOnClickListener(new OnClickListener() { public void onClick(View v) { btnDownload.setText("Download is in Progress."); String savedFilePath=Download("http://www.domain.com/android1.png"); Toast.makeText(getApplicationContext(), "File is Saved in "+savedFilePath, 1000).show(); if(savedFilePath!=null) { btnDownload.setText("Download Completed."); } } }); } public String Download(String Url) { String filepath=null; try { //set the download URL, a url that points to a file on the internet //this is the file to be downloaded URL url = new URL(Url); //create the new connection HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); //set up some things on the connection urlConnection.setRequestMethod("GET"); urlConnection.setDoOutput(true); //and connect! urlConnection.connect(); //set the path where we want to save the file //in this case, going to save it on the root directory of the //sd card. File SDCardRoot = Environment.getExternalStorageDirectory(); //create a new file, specifying the path, and the filename //which we want to save the file as. String filename= "download_"+System.currentTimeMillis()+".png"; // you can download to any type of file ex:.jpeg (image) ,.txt(text file),.mp3 (audio file) Log.i("Local filename:",""+filename); file = new File(SDCardRoot,filename); if(file.createNewFile()) { file.createNewFile(); } //this will be used to write the downloaded data into the file we created FileOutputStream fileOutput = new FileOutputStream(file); //this will be used in reading the data from the internet InputStream inputStream = urlConnection.getInputStream(); //this is the total size of the file int totalSize = urlConnection.getContentLength(); //variable to store total downloaded bytes int downloadedSize = 0; //create a buffer... byte[] buffer = new byte[1024]; int bufferLength = 0; //used to store a temporary size of the buffer //now, read through the input buffer and write the contents to the file while ( (bufferLength = inputStream.read(buffer)) > 0 ) { //add the data in the buffer to the file in the file output stream (the file on the sd card fileOutput.write(buffer, 0, bufferLength); //add up the size so we know how much is downloaded downloadedSize += bufferLength; //this is where you would do something to report the prgress, like this maybe Log.i("Progress:","downloadedSize:"+downloadedSize+"totalSize:"+ totalSize) ; btnDownload.setText("download Status:"+downloadedSize+" / "+totalSize); } //close the output stream when done fileOutput.close(); if(downloadedSize==totalSize) filepath=file.getPath(); //catch some possible errors... } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { filepath=null; btnDownload.setText("Internet Connection Failed.\n"+e.getMessage()); e.printStackTrace(); } Log.i("filepath:"," "+filepath) ; return filepath; } }

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• Xcode newb -- #include can't find my file

  - by morgancodes

  I'm trying to get a third party audio library (STK) working inside Xcode. Along with the standard .h files, many of the implementation files include a file called SKINI.msg. SKINI.msg is in the same directory as all of the header files. The header files are getting included fine, but the compiler complains that it can't find SKINI.msg. What do I need to do to get Xcode to happily include SKINI.msg? Edit: Here's the contents of SKINI.msg: /*********************************************************/ /* Definition of SKINI Message Types and Special Symbols Synthesis toolKit Instrument Network Interface These symbols should have the form: \c __SK_<name>_ where <name> is the string used in the SKINI stream. by Perry R. Cook, 1995 - 2010. */ /*********************************************************/ namespace stk { #define NOPE -32767 #define YEP 1 #define SK_DBL -32766 #define SK_INT -32765 #define SK_STR -32764 #define __SK_Exit_ 999 /***** MIDI COMPATIBLE MESSAGES *****/ /*** (Status bytes for channel=0) ***/ #define __SK_NoteOff_ 128 #define __SK_NoteOn_ 144 #define __SK_PolyPressure_ 160 #define __SK_ControlChange_ 176 #define __SK_ProgramChange_ 192 #define __SK_AfterTouch_ 208 #define __SK_ChannelPressure_ __SK_AfterTouch_ #define __SK_PitchWheel_ 224 #define __SK_PitchBend_ __SK_PitchWheel_ #define __SK_PitchChange_ 49 #define __SK_Clock_ 248 #define __SK_SongStart_ 250 #define __SK_Continue_ 251 #define __SK_SongStop_ 252 #define __SK_ActiveSensing_ 254 #define __SK_SystemReset_ 255 #define __SK_Volume_ 7 #define __SK_ModWheel_ 1 #define __SK_Modulation_ __SK_ModWheel_ #define __SK_Breath_ 2 #define __SK_FootControl_ 4 #define __SK_Portamento_ 65 #define __SK_Balance_ 8 #define __SK_Pan_ 10 #define __SK_Sustain_ 64 #define __SK_Damper_ __SK_Sustain_ #define __SK_Expression_ 11 #define __SK_AfterTouch_Cont_ 128 #define __SK_ModFrequency_ __SK_Expression_ #define __SK_ProphesyRibbon_ 16 #define __SK_ProphesyWheelUp_ 2 #define __SK_ProphesyWheelDown_ 3 #define __SK_ProphesyPedal_ 18 #define __SK_ProphesyKnob1_ 21 #define __SK_ProphesyKnob2_ 22 /*** Instrument Family Specific ***/ #define __SK_NoiseLevel_ __SK_FootControl_ #define __SK_PickPosition_ __SK_FootControl_ #define __SK_StringDamping_ __SK_Expression_ #define __SK_StringDetune_ __SK_ModWheel_ #define __SK_BodySize_ __SK_Breath_ #define __SK_BowPressure_ __SK_Breath_ #define __SK_BowPosition_ __SK_PickPosition_ #define __SK_BowBeta_ __SK_BowPosition_ #define __SK_ReedStiffness_ __SK_Breath_ #define __SK_ReedRestPos_ __SK_FootControl_ #define __SK_FluteEmbouchure_ __SK_Breath_ #define __SK_JetDelay_ __SK_FluteEmbouchure_ #define __SK_LipTension_ __SK_Breath_ #define __SK_SlideLength_ __SK_FootControl_ #define __SK_StrikePosition_ __SK_PickPosition_ #define __SK_StickHardness_ __SK_Breath_ #define __SK_TrillDepth_ 1051 #define __SK_TrillSpeed_ 1052 #define __SK_StrumSpeed_ __SK_TrillSpeed_ #define __SK_RollSpeed_ __SK_TrillSpeed_ #define __SK_FilterQ_ __SK_Breath_ #define __SK_FilterFreq_ 1062 #define __SK_FilterSweepRate_ __SK_FootControl_ #define __SK_ShakerInst_ 1071 #define __SK_ShakerEnergy_ __SK_Breath_ #define __SK_ShakerDamping_ __SK_ModFrequency_ #define __SK_ShakerNumObjects_ __SK_FootControl_ #define __SK_Strumming_ 1090 #define __SK_NotStrumming_ 1091 #define __SK_Trilling_ 1092 #define __SK_NotTrilling_ 1093 #define __SK_Rolling_ __SK_Strumming_ #define __SK_NotRolling_ __SK_NotStrumming_ #define __SK_PlayerSkill_ 2001 #define __SK_Chord_ 2002 #define __SK_ChordOff_ 2003 #define __SK_SINGER_FilePath_ 3000 #define __SK_SINGER_Frequency_ 3001 #define __SK_SINGER_NoteName_ 3002 #define __SK_SINGER_Shape_ 3003 #define __SK_SINGER_Glot_ 3004 #define __SK_SINGER_VoicedUnVoiced_ 3005 #define __SK_SINGER_Synthesize_ 3006 #define __SK_SINGER_Silence_ 3007 #define __SK_SINGER_VibratoAmt_ __SK_ModWheel_ #define __SK_SINGER_RndVibAmt_ 3008 #define __SK_SINGER_VibFreq_ __SK_Expression_ } // stk namespace And here's what the compiler said: CompileC build/StkCompile.build/Debug-iphonesimulator/StkCompile.build/Objects-normal/i386/BandedWG.o "../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp" normal i386 c++ com.apple.compilers.gcc.4_2 cd /Users/morganpackard/Desktop/trashme/StkCompile setenv LANG en_US.US-ASCII setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 -x c++ -arch i386 -fmessage-length=0 -pipe -Wno-trigraphs -fpascal-strings -fasm-blocks -O0 -Wreturn-type -Wunused-variable -D__IPHONE_OS_VERSION_MIN_REQUIRED=30000 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.2.sdk -fvisibility=hidden -fvisibility-inlines-hidden -mmacosx-version-min=10.5 -gdwarf-2 -iquote /Users/morganpackard/Desktop/trashme/StkCompile/build/StkCompile.build/Debug-iphonesimulator/StkCompile.build/StkCompile-generated-files.hmap -I/Users/morganpackard/Desktop/trashme/StkCompile/build/StkCompile.build/Debug-iphonesimulator/StkCompile.build/StkCompile-own-target-headers.hmap -I/Users/morganpackard/Desktop/trashme/StkCompile/build/StkCompile.build/Debug-iphonesimulator/StkCompile.build/StkCompile-all-target-headers.hmap -iquote /Users/morganpackard/Desktop/trashme/StkCompile/build/StkCompile.build/Debug-iphonesimulator/StkCompile.build/StkCompile-project-headers.hmap -F/Users/morganpackard/Desktop/trashme/StkCompile/build/Debug-iphonesimulator -I/Users/morganpackard/Desktop/trashme/StkCompile/build/Debug-iphonesimulator/include -I/Users/morganpackard/Desktop/trashme/StkCompile/build/StkCompile.build/Debug-iphonesimulator/StkCompile.build/DerivedSources/i386 -I/Users/morganpackard/Desktop/trashme/StkCompile/build/StkCompile.build/Debug-iphonesimulator/StkCompile.build/DerivedSources -include /var/folders/dx/dxSUSyOJFv0MBEh9qC1oJ++++TI/-Caches-/com.apple.Xcode.501/SharedPrecompiledHeaders/StkCompile_Prefix-bopqzvwpuyqltrdumgtjtfrjvtzb/StkCompile_Prefix.pch -c "/Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp" -o /Users/morganpackard/Desktop/trashme/StkCompile/build/StkCompile.build/Debug-iphonesimulator/StkCompile.build/Objects-normal/i386/BandedWG.o /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp:33:21: error: SKINI.msg: No such file or directory /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp: In member function 'virtual void stk::BandedWG::controlChange(int, stk::StkFloat)': /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp:326: error: '__SK_BowPressure_' was not declared in this scope /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp:342: error: '__SK_AfterTouch_Cont_' was not declared in this scope /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp:349: error: '__SK_ModWheel_' was not declared in this scope /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp:357: error: '__SK_ModFrequency_' was not declared in this scope /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp:359: error: '__SK_Sustain_' was not declared in this scope /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp:363: error: '__SK_Portamento_' was not declared in this scope /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp:367: error: '__SK_ProphesyRibbon_' was not declared in this scope

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• Secondary DHCP server won't start on Centos 6.2

  - by Slowjoe

  I'm trying to create a backup DHCP server. Server times are in sync. Primary server starts fine. Secondary server won't start. Error from /var/log/messages is: Sep 15 14:47:45 stream dhcpd: Copyright 2004-2010 Internet Systems Consortium. Sep 15 14:47:45 stream dhcpd: All rights reserved. Sep 15 14:47:45 stream dhcpd: For info, please visit https://www.isc.org/software/dhcp/ Sep 15 14:47:45 stream dhcpd: /etc/dhcp/dhcpd.conf line 25: invalid statement in peer declaration Sep 15 14:47:45 stream dhcpd: #011max-response-default Sep 15 14:47:45 stream dhcpd: ^ Sep 15 14:47:45 stream dhcpd: /etc/dhcp/dhcpd.conf line 41: failover peer dhcp-failover: not found Sep 15 14:47:45 stream dhcpd: failover peer "dhcp-failover" Sep 15 14:47:45 stream dhcpd: ^ Sep 15 14:47:45 stream dhcpd: /etc/dhcp/dhcpd.conf line 49: failover peer dhcp-failover: not found Sep 15 14:47:45 stream dhcpd: failover peer "dhcp-failover" Sep 15 14:47:45 stream dhcpd: ^ Sep 15 14:47:45 stream dhcpd: WARNING: Host declarations are global. They are not limited to the scope you declared them in. Sep 15 14:47:45 stream dhcpd: /etc/dhcp/dhcpd.conf line 70: failover peer dhcp-failover: not found Sep 15 14:47:45 stream dhcpd: failover peer "dhcp-failover" Sep 15 14:47:45 stream dhcpd: ^ Sep 15 14:47:45 stream dhcpd: /etc/dhcp/dhcpd.conf line 78: failover peer dhcp-failover: not found Sep 15 14:47:45 stream dhcpd: failover peer "dhcp-failover" Sep 15 14:47:45 stream dhcpd: ^ Sep 15 14:47:45 stream dhcpd: Configuration file errors encountered -- exiting Sep 15 14:47:45 stream dhcpd: Sep 15 14:47:45 stream dhcpd: This version of ISC DHCP is based on the release available Sep 15 14:47:45 stream dhcpd: on ftp.isc.org. Features have been added and other changes Sep 15 14:47:45 stream dhcpd: have been made to the base software release in order to make Sep 15 14:47:45 stream dhcpd: it work better with this distribution. Sep 15 14:47:45 stream dhcpd: Sep 15 14:47:45 stream dhcpd: Please report for this software via the CentOS Bugs Database: Sep 15 14:47:45 stream dhcpd: http://bugs.centos.org/ Sep 15 14:47:45 stream dhcpd: Sep 15 14:47:45 stream dhcpd: exiting. Config file contents: # DHCP Server Configuration file. # see /usr/share/doc/dhcp*/dhcpd.conf.sample # see 'man 5 dhcpd.conf' # option domain-name "eng.foo.com"; option domain-name-servers ns0.eng.foo.com, ns1.eng.foo.com; option ntp-servers ntp.eng.foo.com; #option time-servers ntp.eng.foo.com; default-lease-time 3600; max-lease-time 7200; authoritative; log-facility local7; failover peer "dhcp-failover" { secondary; address 10.0.1.70; port 647; peer address 10.0.1.11; peer port 647; max-response-default 30; max-unacked-updates 10; load balance max seconds 3; } # # Management subnet # subnet 10.0.0.0 netmask 255.255.255.0 { option subnet-mask 255.255.255.0; option broadcast-address 10.0.0.255; option routers 10.0.0.1; option domain-search "eng.foo.com", "foo.com"; # Unknown clients get this pool pool { failover peer "dhcp-failover"; max-lease-time 300; range 10.0.0.240 10.0.0.249; allow unknown-clients; } # Known clients get this pool pool { failover peer "dhcp-failover"; max-lease-time 28800; range 10.0.0.150 10.0.0.199; deny unknown-clients; } include "/etc/dhcp/dhcpd.conf-engmgmt"; } # # Data subnet # subnet 10.0.1.0 netmask 255.255.255.0 { option subnet-mask 255.255.255.0; option broadcast-address 10.0.1.255; option routers 10.0.1.1; option domain-search "eng.foo.com", "foo.com"; # Unknown clients get this pool pool { failover peer "dhcp-failover"; max-lease-time 300; range 10.0.1.240 10.0.1.249; allow unknown-clients; } # Known clients get this pool pool { failover peer "dhcp-failover"; max-lease-time 28800; range 10.0.1.150 10.0.1.199; deny unknown-clients; } # For centos network installs if substring (option vendor-class-identifier, 0, 8) = "anaconda" { filename "/autohome/distro/ks/"; next-server eng-data.eng.foo.com; } # For PXE network installs if substring (option vendor-class-identifier, 0, 9) = "PXEClient" { filename "pxelinux.0"; next-server eng-data.eng.foo.com; } # For KVM PXE network installs if substring (option vendor-class-identifier, 0, 9) = "Etherboot" { filename "pxelinux.0"; next-server eng-data.eng.foo.com; } include "/etc/dhcp/dhcpd.conf-engdata"; }

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• Is this question too hard for a seasoned C++ architect?

  - by Monomer

  Background Information We're looking to hire a seasoned C++ architect (10+years dev, of which at least 6years must be C++ ) for a high frequency trading platform. Job advert says STL, Boost proficiency is a must with preferences to modern uses of C++. The company I work for is a Fortune 500 IB (aka finance industry), it requires passes in all the standard SHL tests (numeric, vocab, spatial etc) before interviews can commence. Everyone on the team was given the task of coming up with one question to ask the candidates during a written/typed test, please note this is the second test provided to the candidates, the first being Advanced IKM C++ test, done in the offices supervised and without internet access. People passing that do the second test. After roughly 70 candidates, my question has been determined to be statistically the worst performing - aka least number of people attempted it, furthermore even less people were able to give meaningful answers. Please note, the second test is not timed, the candidate can literally take as long as they like (we've had one person take roughly 10.5hrs) My question to SO is this, after SHL and IKM adv c++ tests, backed up with at least 6+ years C++ development experience, is it still ok not to be able to even comment about let alone come up with some loose strategy for solving the following question. The Question There is a class C with methods foo, boo, boo_and_foo and foo_and_boo. Each method takes i,j,k and l clock cycles respectively, where i < j, k < i+j and l < i+j. class C { public: int foo() {...} int boo() {...} int boo_and_foo() {...} int foo_and_boo() {...} }; In code one might write: C c; . . int i = c.foo() + c.boo(); But it would be better to have: int i = c.foo_and_boo(); What changes or techniques could one make to the definition of C, that would allow similar syntax of the original usage, but instead have the compiler generate the latter. Note that foo and boo are not commutative. Possible Solution We were basically looking for an expression templates based approach, and were willing to give marks to anyone who had even hinted or used the phrase or related terminology. We got only two people that used the wording, but weren't able to properly describe how they accomplish the task in detail. We use such techniques all over the place, due to the use of various mathematical operators for matrix and vector based calculations, for example to decide when to use IPP or hand woven implementations at compile time for a particular architecture and many other things. The particular area of software development requires microsecond response times. I believe could/should be able to teach a junior such techniques, but given the assumed caliber of candidates I expected a little more. Is this really a difficult question? Should it be removed? Or are we just not seeing the right candidates?

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• Web service using Data Dynamics ActiveReports occasionally slows down

  - by Swoop

  My company is running into a problem with a web service that is written in C#/ASP.Net. The service receives an identity key for data in SQL Server and a path to generate and save a PDF report for this data. In most cases, this web service returns results to the calling web pages very quickly, usually within a few seconds max. However, it seems to occasionally hit a significant slowdown. The web application calling the web service will generate a timeout error when this slowdown occurs. We have checked and the PDF does get created and saved to the server, so it looks like the web service eventually finishes executing. It seems to take about 1 to 2 minutes for processing to have completed. The PDF is generated using ActiveReports from Data Dynamics. Wwhen this problem occurs, making a small change to the web service's config file (ie, adding a blank space to a connection string line) seems to restart the web service and everything is perfectly ok for a period of time afterwards. Other web applications that are running on the same web server do not seem to experience this type of behavior, only this particular web service. I have added the code for the web service below. It is basic calls to 3rd party libraries. We are not able to recreate this problem in test. I am wondering what might be causing this issue? [WebMethod] public string Publish(int identity, string transactionType, string directory, string filename) { try { AdpConnection Conn = new AdpConnection(ConfigurationManager.AppSettings["myDBConnString"]); AdpCommand Cmd = new AdpCommand("storedproc_GetData", oConn); AdpParameter Param; Cmd.CommandType = CommandType.StoredProcedure; Param = Cmd.CreateParameter("@Identity", DbType.Int32); Param.Value = identity; Cmd.Parameters.Add(oParam); Conn.Open(); string aResponse = Cmd.ExecuteScalar().ToString(); Conn.Close(); if (transactionType == "typeA") { //Parse response DataSet dsResponse = ParseDataResponse(aResponse); //dsResponse.WriteXml(@ConfigurationManager.AppSettings["DocsDir"] + identity.ToString() + ".xml"); DataDynamics.ActiveReports.ActiveReport3 rpt = new DataDynamics.ActiveReports.ActiveReport3(); rpt.LoadLayout(@ConfigurationManager.AppSettings["myReportPath"] + "TypeA.rpx"); rpt.AddNamedItem("ReportPath", @ConfigurationManager.AppSettings["myReportPath"]); rpt.AddNamedItem("XMLSTRING", FormatXML(dsResponse.GetXml())); DataDynamics.ActiveReports.DataSources.XMLDataSource xmlds = new DataDynamics.ActiveReports.DataSources.XMLDataSource(); xmlds.FileURL = null; xmlds.RecordsetPattern = "//DataPatternA"; xmlds.LoadXML(FormatXML(dsResponse.GetXml())); if (!System.IO.Directory.Exists(@ConfigurationManager.AppSettings["DocsDir"] + directory + @"\")) { System.IO.Directory.CreateDirectory(@ConfigurationManager.AppSettings["DocsDir"] + directory + @"\"); } string sXML = FormatXML(dsResponse.GetXml()); StreamWriter sw = new StreamWriter(@ConfigurationManager.AppSettings["DocsDir"] + directory + @"\" + filename + ".xml", false); sw.Write(sXML); sw.Close(); rpt.DataSource = xmlds; rpt.Run(true); DataDynamics.ActiveReports.Export.Pdf.PdfExport xPdf = new DataDynamics.ActiveReports.Export.Pdf.PdfExport(); xPdf.Export(rpt.Document, @ConfigurationManager.AppSettings["DocsDir"] + directory + @"\" + filename + ".pdf"); } } catch(Exception ex) { return "Error: " + ex.ToString(); } return @ConfigurationManager.AppSettings["DocsDir"] + directory + @"\" + filename + ".pdf"; }

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• Java 7 update 6 installation fails on Windows 7 when Chrome is default browser

  - by ali1234

  I am configuring a brand new Lenovo U410 system with Windows 7 Home Premium for a user. I received the system direct from the shop. As part of the configuration I installed Java using the online installer. This worked correctly. Later, due to a mistake I made, I needed to restore the system to factory default. The factory default FORMATS C:\ and puts back (supposedly) the exact factory configuration. However, after doing this, I was no longer able to install Java successfully using the same method I used before. Now, whenever I attempt to use the online Java installer, the following happens. First of all, a window always appears "Welcome to Java", "Downloading Java Installer...". After short time this window disappears and then one of three things happens: The very first time I do this after doing a factory reset, I get a Windows error report, which contains this information: Application Name: JavaSetup7u5.exe Application Version: 7.0.50.6 Application Timestamp: 4feacd84 Fault Module Name: JavaIC.dll Fault Module Version: 9.9.9.9 Fault Module Timestamp: 4f2343d6 Exception Offset: 000052cb Exception Code: c0000417 Exception Data: 00000000 OS Version: 6.1.7600.2.0.0.768.3 Locale ID: 1033 Additional Information 1: 773c Additional Information 2: 773cd78cf06816f8246f359fa270f3bb Additional Information 3: f51a Additional Information 4: f51aaea7d22f36fa9e3a626b5a5cd1c3 2. Subsequent runs produce either this error message: "Error: Java(TM) installer - Downloaded file C:\Users\\AppData\Local\Temp\fx-runtime.exe is corrupt." or Nothing happens at all. I Believe this is a red herring. Running the installer again causes a different error because the files were downloaded and the installer crashed before it could clean up. This isn't the actual problem, as when this happens the installer deletes the downloaded files, and then when you run it for the third time, it downloads everything again and does the javaic.dll crash. I suspect the downloader is appending to the existing files or something, causing the corruption. I have tried all of the above as Administrator and as a normal user. I have tried reseting the system to factory defaults several times. I have tried downloading with Chrome and Internet Explorer 9. I have tried uninstalling all anti-virus software and disabling the windows firewall entirely. The only thing which makes a difference is running the installer in Windows XP compatibility mode, which allows the installation to complete. I know I can workaround this error by using the offline installer so please don't post that as an answer. I am looking for an explanation of the root cause. Additionally, if I use the offline installer, the updater does not work. The updater also does not work if I install in XP mode. The updater fails because it works by just downloading the newest online setup and running it. Also remember that the installers are digitally signed. The signitures verify correctly so there is no way in hell that this is caused by corrupted downloads. Some theories I have: The Java setup files on java.com actually changed in between the first successful install and my later attempts. Seems unlikely as none of the version numbers have changed. However, I have seen a couple of reports of this error which showed up in the past 24 hours. This looks like the most likely explanation right now: http://www.oracle.com/us/corporate/press/1735645 - Oracle released 7 update 6 two days ago. Careful inspection of the installers reveal that they are in fact attempting to download .6, not .5 as the download page claims. Not actually correct. Only the update tool tries to install 7u6. The online installer still tries 7u5. However, 7u6 being released two days ago is too much of a coincidence to ignore. Update: The 7u6 online installer is available from Oracle technetwork. It crashes in exactly the same way. The factory reset software uses GMT-8 and I am on GMT-1. As a result, after factory reset, any software which cares to check would think that the system was restored 7 hours in the future, due to Window's awful policy of storing local time in the system clock. This could be confusing a certificate check or similar. Update: I discovered that this does cause Windows Update to fail. The workaround, setting the clock back before starting factory reset, does not enable Java to install correctly. The factory reset image isn't really the same as what is installed in the main partition when you buy the system. Naughty Lenovo. The installer appears to crash while installing or displaying something to do with the Ask.com toolbar. That seems to be what javaic.dll does. Microsoft Tuesday was the 14th. Some update in that could be causing this. However, I'm factory reseting the machine every time, so unless the patches get slipstreamed into the recovery image, or there is some mechanism by which they get silently installed even if updates are disabled, then I don't see how this can be the cause. Major breakthrough: The default browser on Lenovo systems is Google Chrome. I noticed that the JavaIC.dll "sponsor check" actually does a check on your default browser in order to decide which sponsor ad to display. Normally that would get you the Ask toolbar on IE9. But that toolbar doesn't work on Chrome, and so the installer tries to display a different ad. The different ad is what causes the crash. Changing the default browser to IE9 allows the installer to run correctly. So this looks like a genuine bug in the sponsor ad code in the installer, caused by a combination of Google Chrome default browser and not being in the US. (Installer also checks your location using IP geolocation service and displays different ads based on that.)

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• Dynamic Scoped Resources in WPF/XAML?

  - by firoso

  I have 2 Xaml files, one containing a DataTemplate which has a resource definition for an Image brush, and the other containing a content control which presents this DataTemplate. The data template is bound to a view model class. Everything seems to work EXCEPT the ImageBrush resource, which just shows up white... Any ideas? File 1: DataTemplate for ViewModel <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:vm="clr-namespace:SEL.MfgTestDev.ESS.ViewModel" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"> <DataTemplate DataType="{x:Type vm:PresenterViewModel}"> <DataTemplate.Resources> <ImageBrush x:Key="PresenterTitleBarFillBrush" TileMode="Tile" Viewbox="{Binding Path=FillBrushDimensions, Mode=Default}" ViewboxUnits="Absolute" Viewport="{Binding Path=FillBrushPatternSize, Mode=Default}" ViewportUnits="Absolute" ImageSource="{Binding Path=FillImage, Mode=Default}"/> </DataTemplate.Resources> <Grid d:DesignWidth="1440" d:DesignHeight="900"> <Grid.ColumnDefinitions> <ColumnDefinition Width="*"/> <ColumnDefinition Width="192"/> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="120"/> <RowDefinition Height="*"/> </Grid.RowDefinitions> <DockPanel HorizontalAlignment="Stretch" Width="Auto" LastChildFill="True" Background="{x:Null}" Grid.ColumnSpan="2"> <Image Source="{Binding Path=ImageSource, Mode=Default}"/> <Rectangle Fill="{DynamicResource PresenterTitleBarFillBrush}"/> </DockPanel> </Grid> </DataTemplate> </ResourceDictionary> File 2: Main Window Class which instanciates the DataTemplate Via it's view model. <Window x:Class="SEL.MfgTestDev.ESS.ESSMainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:vm="clr-namespace:SEL.MfgTestDev.ESS.ViewModel" Title="ESS Control Window" Height="900" Width="1440" WindowState="Maximized" WindowStyle="None" ResizeMode="NoResize" DataContext="{Binding}"> <Window.Resources> <ResourceDictionary Source="PresenterViewModel.xaml" /> </Window.Resources> <ContentControl> <ContentControl.Content> <vm:PresenterViewModel ImageSource="XAMLResources\SEL25YearsTitleBar.bmp" FillImage="XAMLResources\SEL25YearsFillPattern.bmp" FillBrushDimensions="0,0,5,110" FillBrushPatternSize="0,0,5,120"/> </ContentControl.Content> </ContentControl> </Window> And for the sake of completeness! The CodeBehind for the View Model using System; using System.Collections.Generic; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Shapes; namespace SEL.MfgTestDev.ESS.ViewModel { public class PresenterViewModel : ViewModelBase { public PresenterViewModel() { } //DataBindings private ImageSource _imageSource; public ImageSource ImageSource { get { return _imageSource; } set { if (_imageSource != value) { _imageSource = value; OnPropertyChanged("ImageSource"); } } } private Rect _fillBrushPatternSize; public Rect FillBrushPatternSize { get { return _fillBrushPatternSize; } set { if (_fillBrushPatternSize != value) { _fillBrushPatternSize = value; OnPropertyChanged("FillBrushPatternSize"); } } } private Rect _fillBrushDimensions; public Rect FillBrushDimensions { get { return _fillBrushDimensions; } set { if (_fillBrushDimensions != value) { _fillBrushDimensions = value; OnPropertyChanged("FillBrushDimensions"); } } } private ImageSource _fillImage; public ImageSource FillImage { get { return _fillImage; } set { if (_fillImage != value) { _fillImage = value; OnPropertyChanged("FillImage"); } } } } }

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• Can't run my servlet from tomcat server even though the classes are in package

  - by Mido

  Hi there, i am trying to get my servlet to run, i have been searching for 2 days and trying every possible solution and no luck. The servet class is in the appropriate folder (i.e under the package name). I also added the jar files needed in my servlet into lib folder. the web.xml file maps the url and defines the servlet. So i did everything in the documentation and wt people said in here and still getting this error : type Exception report message description The server encountered an internal error () that prevented it from fulfilling this request. exception javax.servlet.ServletException: Error instantiating servlet class assign1a.RPCServlet org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:108) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:558) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:379) org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:282) org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:357) org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1687) java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) java.lang.Thread.run(Thread.java:619) root cause java.lang.NoClassDefFoundError: assign1a/RPCServlet (wrong name: server/RPCServlet) java.lang.ClassLoader.defineClass1(Native Method) java.lang.ClassLoader.defineClassCond(ClassLoader.java:632) java.lang.ClassLoader.defineClass(ClassLoader.java:616) java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2820) org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1143) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1638) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1516) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:108) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:558) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:379) org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:282) org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:357) org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1687) java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) java.lang.Thread.run(Thread.java:619) note The full stack trace of the root cause is available in the Apache Tomcat/7.0.5 logs. Also here is my servlet code : package assign1a; import java.io.IOException; import java.util.logging.Level; import java.util.logging.Logger; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import lib.jsonrpc.RPCService; public class RPCServlet extends HttpServlet { /** * */ private static final long serialVersionUID = -5274024331393844879L; private static final Logger log = Logger.getLogger(RPCServlet.class.getName()); protected RPCService service = new ServiceImpl(); public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { response.setContentType("text/html"); response.getWriter().write("rpc service " + service.getServiceName() + " is running..."); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { try { service.dispatch(request, response); } catch (Throwable t) { log.log(Level.WARNING, t.getMessage(), t); } } } Please help me :) Thanks. EDIT: here are the contents of my web.xml file <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0" metadata-complete="true"> <servlet> <servlet-name>jsonrpc</servlet-name> <servlet-class>assign1a.RPCServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>jsonrpc</servlet-name> <url-pattern>/rpc</url-pattern> </servlet-mapping> </web-app>

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• Resilient backpropagation neural network - question about gradient

  - by Raf

  Hello Guys, First I want to say that I'm really new to neural networks and I don't understand it very good ;) I've made my first C# implementation of the backpropagation neural network. I've tested it using XOR and it looks it work. Now I would like change my implementation to use resilient backpropagation (Rprop - http://en.wikipedia.org/wiki/Rprop). The definition says: "Rprop takes into account only the sign of the partial derivative over all patterns (not the magnitude), and acts independently on each "weight". Could somebody tell me what partial derivative over all patterns is? And how should I compute this partial derivative for a neuron in hidden layer. Thanks a lot UPDATE: My implementation base on this Java code: www_.dia.fi.upm.es/~jamartin/downloads/bpnn.java My backPropagate method looks like this: public double backPropagate(double[] targets) { double error, change; // calculate error terms for output double[] output_deltas = new double[outputsNumber]; for (int k = 0; k < outputsNumber; k++) { error = targets[k] - activationsOutputs[k]; output_deltas[k] = Dsigmoid(activationsOutputs[k]) * error; } // calculate error terms for hidden double[] hidden_deltas = new double[hiddenNumber]; for (int j = 0; j < hiddenNumber; j++) { error = 0.0; for (int k = 0; k < outputsNumber; k++) { error = error + output_deltas[k] * weightsOutputs[j, k]; } hidden_deltas[j] = Dsigmoid(activationsHidden[j]) * error; } //update output weights for (int j = 0; j < hiddenNumber; j++) { for (int k = 0; k < outputsNumber; k++) { change = output_deltas[k] * activationsHidden[j]; weightsOutputs[j, k] = weightsOutputs[j, k] + learningRate * change + momentumFactor * lastChangeWeightsForMomentumOutpus[j, k]; lastChangeWeightsForMomentumOutpus[j, k] = change; } } // update input weights for (int i = 0; i < inputsNumber; i++) { for (int j = 0; j < hiddenNumber; j++) { change = hidden_deltas[j] * activationsInputs[i]; weightsInputs[i, j] = weightsInputs[i, j] + learningRate * change + momentumFactor * lastChangeWeightsForMomentumInputs[i, j]; lastChangeWeightsForMomentumInputs[i, j] = change; } } // calculate error error = 0.0; for (int k = 0; k < outputsNumber; k++) { error = error + 0.5 * (targets[k] - activationsOutputs[k]) * (targets[k] - activationsOutputs[k]); } return error; } So can I use change = hidden_deltas[j] * activationsInputs[i] variable as a gradient (partial derivative) for checking the sing?

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• How to overcome shortcomings in reporting from EAV database?

  - by David Archer

  The major shortcomings with Entity-Attribute-Value database designs in SQL all seem to be related to being able to query and report on the data efficiently and quickly. Most of the information I read on the subject warn against implementing EAV due to these problems and the commonality of querying/reporting for almost all applications. I am currently designing a system where almost all the fields necessary for data storage are not known at design/compile time and are defined by the end-user of the system. EAV seems like a good fit for this requirement but due to the problems I've read about, I am hesitant in implementing it as there are also some pretty heavy reporting requirements for this system as well. I think I've come up with a way around this but would like to pose the question to the SO community. Given that typical normalized database (OLTP) still isn't always the best option for running reports, a good practice seems to be having a "reporting" database (OLAP) where the data from the normalized database is copied to, indexed extensively, and possibly denormalized for easier querying. Could the same idea be used to work around the shortcomings of an EAV design? The main downside I see are the increased complexity of transferring the data from the EAV database to reporting as you may end up having to alter the tables in the reporting database as new fields are defined in the EAV database. But that is hardly impossible and seems to be an acceptable tradeoff for the increased flexibility given by the EAV design. This downside also exists if I use a non-SQL data store (i.e. CouchDB or similar) for the main data storage since all the standard reporting tools are expecting a SQL backend to query against. Do the issues with EAV systems mostly go away if you have a seperate reporting database for querying? EDIT: Thanks for the comments so far. One of the important things about the system I'm working on it that I'm really only talking about using EAV for one of the entities, not everything in the system. The whole gist of the system is to be able to pull data from multiple disparate sources that are not known ahead of time and crunch the data to come up with some "best known" data about a particular entity. So every "field" I'm dealing with is multi-valued and I'm also required to track history for each. The normalized design for this ends up being 1 table per field which makes querying it kind of painful anyway. Here are the table schemas and sample data I'm looking at (obviously changed from what I'm working on but I think it illustrates the point well): EAV Tables Person ------------------- - Id - Name - ------------------- - 123 - Joe Smith - ------------------- Person_Value ------------------------------------------------------------------- - PersonId - Source - Field - Value - EffectiveDate - ------------------------------------------------------------------- - 123 - CIA - HomeAddress - 123 Cherry Ln - 2010-03-26 - - 123 - DMV - HomeAddress - 561 Stoney Rd - 2010-02-15 - - 123 - FBI - HomeAddress - 676 Lancas Dr - 2010-03-01 - ------------------------------------------------------------------- Reporting Table Person_Denormalized ---------------------------------------------------------------------------------------- - Id - Name - HomeAddress - HomeAddress_Confidence - HomeAddress_EffectiveDate - ---------------------------------------------------------------------------------------- - 123 - Joe Smith - 123 Cherry Ln - 0.713 - 2010-03-26 - ---------------------------------------------------------------------------------------- Normalized Design Person ------------------- - Id - Name - ------------------- - 123 - Joe Smith - ------------------- Person_HomeAddress ------------------------------------------------------ - PersonId - Source - Value - Effective Date - ------------------------------------------------------ - 123 - CIA - 123 Cherry Ln - 2010-03-26 - - 123 - DMV - 561 Stoney Rd - 2010-02-15 - - 123 - FBI - 676 Lancas Dr - 2010-03-01 - ------------------------------------------------------ The "Confidence" field here is generated using logic that cannot be expressed easily (if at all) using SQL so my most common operation besides inserting new values will be pulling ALL data about a person for all fields so I can generate the record for the reporting table. This is actually easier in the EAV model as I can do a single query. In the normalized design, I end up having to do 1 query per field to avoid a massive cartesian product from joining them all together.

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• wmi not available for some time after reboot

  - by Alex Okrushko

  I'm having the problem with the WMI availability on logon. Right after reboot I open cmd and with python interpreter: >>> import wmi >>> c = wmi.WMI() >>> c.Win32_OperatingSystem() Traceback (most recent call last): File "<stdin>", line 1, in <module> File "C:\Python27\lib\site-packages\wmi.py", line 1147, in __getattr__ return getattr (self._namespace, attribute) File "C:\Python27\lib\site-packages\win32com\client\dynamic.py", line 516, in __getattr__ raise AttributeError("%s.%s" % (self._username_, attr)) AttributeError: winmgmts:.Win32_OperatingSystem >>> 5 minutes later I open another cmd and python interpreter: Python 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)] on win 32 Type "help", "copyright", "credits" or "license" for more information. >>> import wmi >>> c = wmi.WMI() >>> c.Win32_OperatingSystem() [<_wmi_object: \\W520-ALEX-WIN7\root\cimv2:Win32_OperatingSystem=@>] >>> NOTE: the first cmd still keeps saying AttributeError even 5 minutes later. NOTE 2: if I logout and login wmi is available, so it is somehow effected by reboot with process explorer I check the environmental variables and they are the same for both cmds What could that be? Please help. UPDATE: Apparently the problem is connecting to the wbem services: >>> import win32com.client >>> win32com.client.Dispatch('WbemScripting.SWbemLocator') <COMObject WbemScripting.SWbemLocator> >>> wmi_service= win32com.client.Dispatch('WbemScripting.SWbemLocator') >>> wbem_service = wmi_service.ConnectServer('.','root/cimv2') >>> wbem_service <COMObject <unknown>> >>> items = wbem_service.ExecQuery('Select * from Win32_OperatingSystem') Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<COMObject <unknown>>", line 3, in ExecQuery File "C:\Python27\lib\site-packages\win32com\client\dynamic.py", line 282, in _ApplyTypes_ result = self._oleobj_.InvokeTypes(*(dispid, LCID, wFlags, retType, argTypes ) + args) pywintypes.com_error: (-2147352567, 'Exception occurred.', (0, u'SWbemServicesEx ', u'Generic failure ', None, 0, -2147217407), None) >>> NOTE 3: wmic os always worked. NOTE 4: re-installing pywin32 package didn't help. Neither did Re-registering/re-compiling the WMI components and resetting of the WMI database (as recommended here) NOTE 5: my 4 Other laptops don't have this problem. Also wmiprov.log has: (Mon Oct 29 11:40:07 2012.248587) : *************************************** (Mon Oct 29 11:40:07 2012.248587) : Could not get pointer to binary resource for file: (Mon Oct 29 11:40:07 2012.248587) : C:\Windows\system32\drivers\ndis.sys[MofResourceName](Mon Oct 29 11:40:07 2012.248587) : (Mon Oct 29 11:40:07 2012.248587) : *************************************** (Mon Oct 29 11:40:07 2012.248587) : *************************************** (Mon Oct 29 11:40:07 2012.248587) : Could not get pointer to binary resource for file: (Mon Oct 29 11:40:07 2012.248587) : C:\Windows\system32\drivers\en-US\ndis.sys.mui[MofResourceName](Mon Oct 29 11:40:07 2012.248587) : (Mon Oct 29 11:40:07 2012.248587) : *************************************** (Mon Oct 29 11:40:07 2012.248603) : *************************************** (Mon Oct 29 11:40:07 2012.248603) : Could not get pointer to binary resource for file: (Mon Oct 29 11:40:07 2012.248603) : C:\Windows\system32\DRIVERS\wmiacpi.sys[MofResource](Mon Oct 29 11:40:07 2012.248603) : (Mon Oct 29 11:40:07 2012.248603) : *************************************** (Mon Oct 29 11:40:07 2012.248603) : *************************************** (Mon Oct 29 11:40:07 2012.248603) : Could not get pointer to binary resource for file: (Mon Oct 29 11:40:07 2012.248603) : C:\Windows\system32\DRIVERS\monitor.sys[MonitorWMI](Mon Oct 29 11:40:07 2012.248603) : (Mon Oct 29 11:40:07 2012.248603) : *************************************** NOTE 6: the WMIDiag tool report is at my dropbox

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• Xcode/iPhone Development 6 months in - Annoyances

  - by clearbrian

  Hi I've been iPhone programming for 6 months and come from a PC/Java/Eclipse background and still have a few annoyances with Xcode/iPhone programming I wonder are there any shortcuts to. Is there any way to prevent multiple windows opening all the time in XCode? a) When you click on the Errors/Warnings in the bottom right of the status bar build errors are shown in separate window. Any way to get these to show in the main editor? b) Anyway to get debugger to appear in main editor. I have a big screen iMac and it's still window hell on Macs. When you come from Alt-Tab the Mac is a nightmare. 2) Anyway to get a toolbar item on the main editor to: a) Open Console (I know CMD-thingy-R) b) Open Break points (you have to open Debugger first then breakpoints) I know there's keyboard shortcuts but I have only left hand free others on the trackball so any keys on right hand side of keyboard are too far. I know you can add Finder toolbar scripts (just wondering if anyway to extend Xcode). Are there utilities to extend Xcode? Scripts/Automator/Any Services I can setup to help. Can you automate Xcode like you can with Windows/ActiveX/VBA 3) Limit lookups using CMD + double click. If I double click on a variable to find its definition using CMD + double click it shows every occurrence of all variables with that name. (annoying it you name all you maps mapView) Anyway to get it to limit to the current class or at least order so current class is first. 4) Find doesn't seem to loop backwards if result all above cursor position I'm in a class and I hit CMD + F for find. Find box appears. I enter some text hit return. It says I have x matches but only back arrow is highlight in Find But when I hit < it does nothing. I need to scroll to the top and redo the search. If the text is both forwards and backwards then both < are highlighted and it works. is this a bug or a 'feature' Missing Eclipse features I have been looking at the User Script menu but was wondering how powerful they are? 5) any scripts around to generate source from members such as description: @property @synthesize if I add a new member, run a script will generate @property/@syntesize and release in dealloc 7) any good sites for scripts? SCM Im having problems with SCM and Folders on HD under project Classes directory. You get a library e.g. JSON. It usually comes as a folder. You copy it to the /Classes for your project. /Classes/JSON I create a Group for the Library in Xcode under Classes group. Classes JSON I drag the files from the folder into xcode into the JSON Group. I add them to the SCM and icon changes from ? to A but if I try and commit them it say folder /JSON is not under SCM. Can you drag a folder into Xcode so that it AND its files get included in SCM? Anyway to stop Xcode Help from being on top all the time. I keep feeling like punching it and telling it to get out of the way! :) I dont mind it open just not in the way once I've finished. Yes I know I can Ctrl-W Sites: the main site I use to learn Obj-C are : stackoverflow.com Google code Search - tonnes of full apps on here http://www.iphonedevsdk.com/forum/iphone-sdk-development/ Apple Developers Forums (anyway to get RSS feed to these or is that blasphemy :) ) Safari - 100s of IT book though prob too many to keep up :) any others? Any site that gives simple examples for Obj-C/ UIKit The docs just show the methods but actual examples (Google code search has helped a lot here)

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• Code Golf: Finite-state machine!

  - by Adam Matan

  Finite state machine A deterministic finite state machine is a simple computation model, widely used as an introduction to automata theory in basic CS courses. It is a simple model, equivalent to regular expression, which determines of a certain input string is Accepted or Rejected. Leaving some formalities aside, A run of a finite state machine is composed of: alphabet, a set of characters. states, usually visualized as circles. One of the states must be the start state. Some of the states might be accepting, usually visualized as double circles. transitions, usually visualized as directed arches between states, are directed links between states associated with an alphabet letter. input string, a list of alphabet characters. A run on the machine begins at the starting state. Each letter of the input string is read; If there is a transition between the current state and another state which corresponds to the letter, the current state is changed to the new state. After the last letter was read, if the current state is an accepting state, the input string is accepted. If the last state was not an accepting state, or a letter had no corresponding arch from a state during the run, the input string is rejected. Note: This short descruption is far from being a full, formal definition of a FSM; Wikipedia's fine article is a great introduction to the subject. Example For example, the following machine tells if a binary number, read from left to right, has an even number of 0s: The alphabet is the set {0,1}. The states are S1 and S2. The transitions are (S1, 0) -> S2, (S1, 1) -> S1, (S2, 0) -> S1 and (S2, 1) -> S2. The input string is any binary number, including an empty string. The rules: Implement a FSM in a language of your choice. Input The FSM should accept the following input: <States> List of state, separated by space mark. The first state in the list is the start state. Accepting states begin with a capital letter. <transitions> One or more lines. Each line is a three-tuple: origin state, letter, destination state) <input word> Zero or more characters, followed by a newline. For example, the aforementioned machine with 1001010 as an input string, would be written as: S1 s2 S1 0 s2 S1 1 S1 s2 0 S1 s2 1 s2 1001010 Output The FSM's run, written as <State> <letter> -> <state>, followed by the final state. The output for the example input would be: S1 1 -> S1 S1 0 -> s2 s2 0 -> S1 S1 1 -> S1 S1 0 -> s2 s2 1 -> s2 s2 0 -> S1 ACCEPT For the empty input '': S1 ACCEPT For 101: S1 1 -> S1 S1 0 -> s2 s2 1 -> s2 REJECT For '10X': S1 1 -> S1 S1 0 -> s2 s2 X REJECT Prize A nice bounty will be given to the most elegant and short solution. Reference implementation A reference Python implementation will be published soon.

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• Parsing a Directory of files - Check for a String

  - by i.h4d35

  This is my first post here so kindly pardon any mistakes that I have. I'm still learning to find my way around Stack Exchange. I am trying to write a Java program that tries to scan a Directory full of either .txt,.rtf or.doc files(and none other). The aim is to search all the files in the directory, and find out if a particular string exists in the file. If it does, it returns the string and the filename that it found the string in. The aim of this program is, it is a project for school wherein the program scans the personal folders of call center employees to check if they have stored any CC/DC nos and if yes, report the folder name - to reduce CC fraud. The search function was fairly straight forward and works when I individually specify the filename. However, the searching the directory and passing the files to the search function has me stumped. I've posted my code so far, if you guys could look thru it and give me some feedback/suggestions, I'd really appreciate it. Thanks in advance import java.io.*; import java.util.*; public class parse2{ void traverse(String directory) throws FileNotFoundException { File dir = new File(directory); if (dir.isDirectory()) { String[] children = dir.list(); for (int i=0; i<children.length; i++) { //System.out.println("\n" + children[i]); reader(children[i]); } } } void reader(String loc) throws FileNotFoundException { FileReader fr = new FileReader(loc); BufferedReader br = new BufferedReader(fr); Scanner sc = new Scanner(br); char[] chkArray; int chk=1; char ch; while(sc.hasNext()) { String chkStr = sc.next(); chkArray = chkStr.toCharArray(); if ((chkArray[0]=='4')&&(chkStr.length()>13)) { for(int i=0;i<chkArray.length;i++) { ch=chkArray[i]; if((ch=='0')||(ch=='1')||(ch=='2')||(ch=='3')||(ch=='4')||(ch=='5')||(ch=='6')||(ch=='7')||(ch=='8')||(ch=='9')) { chk=0; continue; } else { chk=1; break; } } if(chk==0) System.out.println("\n"+ chkStr); } else if((chkArray[0]=='5')&&(chkStr.length()>13)) { for(int i=0;i<chkArray.length;i++) { ch=chkArray[i]; if((ch=='0')||(ch=='1')||(ch=='2')||(ch=='3')||(ch=='4')||(ch=='5')||(ch=='6')||(ch=='7')||(ch=='8')||(ch=='9')) { chk=0; continue; } else { chk=1; break; } } if(chk==0) System.out.println("\n"+ chkStr); } else if((chkArray[0]=='6')&&(chkStr.length()>13)) { for(int i=0;i<chkArray.length;i++) { ch=chkArray[i]; if((ch=='0')||(ch=='1')||(ch=='2')||(ch=='3')||(ch=='4')||(ch=='5')||(ch=='6')||(ch=='7')||(ch=='8')||(ch=='9')) { chk=0; continue; } else { chk=1; break; } } if(chk==0) System.out.println("\n"+ chkStr); } } } public static void main(String args[]) throws FileNotFoundException { parse2 P = new parse2(); P.traverse("C:/Documents and Settings/h4d35/Desktop/javatest/chk"); } }

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• How can I get the output of a command terminated by a alarm() call in Perl?

  - by rockyurock

  Case 1 If I run below command i.e iperf in UL only, then i am able to capture the o/p in txt file @output = readpipe("iperf.exe -u -c 127.0.0.1 -p 5001 -b 3600k -t 10 -i 1"); open FILE, ">Misplay_DL.txt" or die $!; print FILE @output; close FILE; Case 2 When I run iperf in DL mode , as we know server will start listening in cont. mode like below even after getting data from client (Here i am using server and client on LAN) @output = system("iperf.exe -u -s -p 5001 -i 1"); on server side: D:\_IOT_SESSION_RELATED\SEEM_ELEMESNTS_AT_COMM_PORT_CONF\Tput_Related_Tools\AUTO MATION_APP_\AUTOMATION_UTILITYiperf.exe -u -s -p 5001 ------------------------------------------------------------ Server listening on UDP port 5001 Receiving 1470 byte datagrams UDP buffer size: 8.00 KByte (default) ------------------------------------------------------------ [1896] local 192.168.5.101 port 5001 connected with 192.168.5.101 port 4878 [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [1896] 0.0- 2.0 sec 881 KBytes 3.58 Mbits/sec 0.000 ms 0/ 614 (0%) command prompt does not appear , process is contd... on client side: D:\_IOT_SESSION_RELATED\SEEM_ELEMESNTS_AT_COMM_PORT_CONF\Tput_Related_Tools\AUTO MATION_APP_\AUTOMATION_UTILITYiperf.exe -u -c 192.168.5.101 -p 5001 -b 3600k -t 2 -i 1 ------------------------------------------------------------ Client connecting to 192.168.5.101, UDP port 5001 Sending 1470 byte datagrams UDP buffer size: 8.00 KByte (default) ------------------------------------------------------------ [1880] local 192.168.5.101 port 4878 connected with 192.168.5.101 port 5001 [ ID] Interval Transfer Bandwidth [1880] 0.0- 1.0 sec 441 KBytes 3.61 Mbits/sec [1880] 1.0- 2.0 sec 439 KBytes 3.60 Mbits/sec [1880] 0.0- 2.0 sec 881 KBytes 3.58 Mbits/sec [1880] Server Report: [1880] 0.0- 2.0 sec 881 KBytes 3.58 Mbits/sec 0.000 ms 0/ 614 (0%) [1880] Sent 614 datagrams D:\_IOT_SESSION_RELATED\SEEM_ELEMESNTS_AT_COMM_PORT_CONF\Tput_Related_Tools\AUTO MATION_APP_\AUTOMATION_UTILITY so with this as server is cont. listening and never terminates so can't take output of server side to a txt file as it is going to the next command itself to create a txt file so i adopted the alarm() function to terminate the server side (iperf.exe -u -s -p 5001) commands after it received all data from the client. could anybody suggest me the way.. Here is my code: #! /usr/bin/perl -w my $command = "iperf.exe -u -s -p 5001"; my @output; eval { local $SIG{ALRM} = sub { die "Timeout\n" }; alarm 20; #@output = `$command`; #my @output = readpipe("iperf.exe -u -s -p 5001"); #my @output = exec("iperf.exe -u -s -p 5001"); my @output = system("iperf.exe -u -s -p 5001"); alarm 0; }; if ($@) { warn "$command timed out.\n"; } else { print "$command successful. Output was:\n", @output; } open FILE, ">display.txt" or die $!; print FILE @output_1; close FILE; i know that with system command i cannot capture the o/p to a txt file but i tried with readpipe() and exec() calls also but in vain... could some one please take a look and let me know why the iperf.exe -u -s -p 5001 is not terminating even after the alarm call and to take the out put to a txt file

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• C# Request not timing out

  - by Joel Kennedy

  I have this code which runs in a BackgroundWorker, and should make a POST request to the server and get a response. It works fine when it is supposed to work, but when I try to induce a 404 error it doesn't catch the error reporting system. loginProcess.DoWork += delegate(object s, DoWorkEventArgs args) { // loginProcess BackgroundWorker try { // Try to login, if error, report loginProcess.ReportProgress(10); String method = "POST"; String postdata = "postdata=test"; String url = "http://localhost/dev/login.php"; loginProcess.ReportProgress(15); WebRequest rqst = HttpWebRequest.Create(url); rqst.Timeout = 5000; ((HttpWebRequest)rqst).KeepAlive = true; loginProcess.ReportProgress(20); //rqst.Timeout = this.Timeout; // only needed, if you use HTTP AUTH //CredentialCache creds = new CredentialCache(); //creds.Add(new Uri(url), "Basic", new NetworkCredential(this.Uname, this.Pwd)); //rqst.Credentials = creds; rqst.Method = method; if (!String.IsNullOrEmpty(postdata)) { //rqst.ContentType = "application/xml"; rqst.ContentType = "application/x-www-form-urlencoded"; loginProcess.ReportProgress(30); byte[] byteData = UTF8Encoding.UTF8.GetBytes(postdata); loginProcess.ReportProgress(40); rqst.ContentLength = byteData.Length; loginProcess.ReportProgress(50); using (Stream postStream = rqst.GetRequestStream()) { loginProcess.ReportProgress(50); postStream.Write(byteData, 0, byteData.Length); loginProcess.ReportProgress(60); postStream.Close(); loginProcess.ReportProgress(70); rqst.GetResponse().Close(); rqst.GetRequestStream().Close(); } } loginProcess.ReportProgress(90); using (var response1 = rqst.GetResponse()) { using (var responseStream1 = response1.GetResponseStream()) { using (var reader1 = new StreamReader(responseStream1)) { //StreamReader rsps = new StreamReader(rqst.GetResponse().GetResponseStream()); string strRsps = reader1.ReadToEnd(); loginProcess.ReportProgress(95); loginVars = strRsps; //rqst. //reader1.Close(); //rsps.Dispose(); } args.Result = "SUCCESS"; } } } catch(WebException err) { // Catch error and put into err variable if(err.Status == WebExceptionStatus.ProtocolError) { // If something is wrong with protocol LoginReporting.ErrorName = Convert.ToString(((HttpWebResponse)err.Response).StatusCode); LoginReporting.ErrorDescription = Convert.ToString(((HttpWebResponse)err.Response).StatusDescription); LoginReporting.ErrorNotes = "Error when logging in, Server returned: " + Convert.ToString(((HttpWebResponse)err.Response).StatusCode); LoginReporting.ErrorLocation = "LoginRequest.ProtocolError"; args.Result = "ERROR"; //MessageBox.Show(Convert.ToString(((HttpWebResponse)err.Response).StatusCode)); //MessageBox.Show(Convert.ToString(((HttpWebResponse)err.Response).StatusDescription)); } else { args.Result = "ERROR"; } } catch(Exception err) { // Catch unhandled error LoginReporting.ErrorName = Convert.ToString(err); LoginReporting.ErrorDescription = Convert.ToString(err.Message); LoginReporting.ErrorNotes = "Error when logging in, Server returned: " + Convert.ToString(err.Message); LoginReporting.ErrorLocation = "LoginRequest.ProtocolError"; args.Result = "ERROR"; } }; I have put a timeout on the request but it just doesn't work! Is this a bug, or am I doing something wrong here? Thanks

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• How do I add a namespace attribute to an element in JAXB when marshalling?

  - by Ryan Elkins

  I'm working with eBay's LMS (Large Merchant Services) and kept running into the error: org.xml.sax.SAXException: SimpleDeserializer encountered a child element, which is NOT expected, in something it was trying to deserialize. After alot of trial and error I traced the problem down. It turns out this works: <?xml version="1.0" encoding="UTF-8"?> <BulkDataExchangeRequests xmlns="urn:ebay:apis:eBLBaseComponents"> <Header> <Version>583</Version> <SiteID>0</SiteID> </Header> <AddFixedPriceItemRequest xmlns="urn:ebay:apis:eBLBaseComponents"> while this (what I've been sending) doesn't: <?xml version="1.0" encoding="UTF-8"?> <BulkDataExchangeRequests xmlns="urn:ebay:apis:eBLBaseComponents"> <Header> <Version>583</Version> <SiteID>0</SiteID> </Header> <AddFixedPriceItemRequest> The difference is the xml namespace attribute on the AddFixedPriceItemRequest . All of my XML is currently being marshalled via JAXB and I'm not sure what is the best way to go about adding a second xmlns attribute to a different element in my file. So that's the question. How do I add an xmlns attribute to another element in JAXB? UPDATE: package ebay.apis.eblbasecomponents; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlType; @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "AddFixedPriceItemRequestType", propOrder = { "item" }) public class AddFixedPriceItemRequestType extends AbstractRequestType { @XmlElement(name = "Item") protected ItemType item; public ItemType getItem() { return item; } public void setItem(ItemType value) { this.item = value; } } Added class definition by request. UPDATE 2: Edited the above class like so to no effect: @XmlAccessorType(XmlAccessType.FIELD) @XmlType(namespace = "urn:ebay:apis:eBLBaseComponents", name = "AddFixedPriceItemRequestType", propOrder = { "item" }) public class AddFixedPriceItemRequestType UPDATE 3: Here is a snippet of the BulkDataExchangeRequestsType class. I tried throwing a namespace="urn:ebay:apis:eBLBaseComponents" into the @XmlElement for AddFixedPriceItemRequest but it didn't do anything. @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "BulkDataExchangeRequestsType", propOrder = { "header", "addFixedPriceItemRequest" }) public class BulkDataExchangeRequestsType { @XmlElement(name = "Header") protected MerchantDataRequestHeaderType header; @XmlElement(name = "AddFixedPriceItemRequest") protected List<AddFixedPriceItemRequestType> addFixedPriceItemRequest; UPDATE 4: Here's the hideous chunk of code that is updating the xml after marshalling for me. This is currently working although I'm not particulary proud of it. DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); dbf.setNamespaceAware(true); DocumentBuilder db = dbf.newDocumentBuilder(); Document doc = db.newDocument(); marshaller.marshal(request, doc); NodeList nodes = doc.getChildNodes(); nodes = nodes.item(0).getChildNodes(); for(int i = 0; i < nodes.getLength(); i++){ Node node = nodes.item(i); if (!node.getNodeName().equals("Header")){ ((Element)node).setAttribute("xmlns", "urn:ebay:apis:eBLBaseComponents"); } } Update 5: For anyone else that runs into this problem with eBay and wonders why - The reasoning behind this most likely has to do with how eBay is handling these requests. The BulkDataExchange probably takes the XML payload, breaks it up, and send the pieces out to the Merchant or Trading API. The inner pieces of the payload then do not have the namespace and the get the error. This is a guess on my part but I wouldn't be surprised if this is what was going on behind the scenes. Thanks for all the help everyone.

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• Print driver installs failing

  - by Kasius

  All of the Windows 7 64-bit Enterprise machines in my organization are failing to install a good number of printer drivers that previously installed without issue. This only happens with printer drivers. And not with all printer drivers. Just some. Network drivers, video drivers, etc. have had no problems. Here is part of setupapi.dev.log for a Dymo LabelWriter printer driver that is failing to install: dvi: {Plug and Play Service: Device Install for USBPRINT\DYMOLABELWRITER_450_TURBO\6&538F51D&0&USB001} ump: Creating Install Process: DrvInst.exe 09:36:58.071 ndv: Infpath=C:\Windows\INF\oem0.inf ndv: DriverNodeName=dymo.inf:DYMO.NTamd64.6.0:LW_450_TURBO_VISTA:8.1.0.363:usbprint\dymolabelwriter_450_aa08 ndv: DriverStorepath=C:\Windows\System32\DriverStore\FileRepository\dymo.inf_amd64_neutral_3a631b118b7a5828\dymo.inf ndv: Building driver list from driver node strong name... dvi: Searching for hardware ID(s): dvi: usbprint\dymolabelwriter_450_aa08 dvi: dymolabelwriter_450_aa08 inf: Opened PNF: 'C:\Windows\System32\DriverStore\FileRepository\dymo.inf_amd64_neutral_3a631b118b7a5828\dymo.inf' ([strings]) dvi: Selected driver installs from section [LW_450_TURBO_VISTA] in 'c:\windows\system32\driverstore\filerepository\dymo.inf_amd64_neutral_3a631b118b7a5828\dymo.inf'. dvi: Class GUID of device changed to: {4d36e979-e325-11ce-bfc1-08002be10318}. dvi: Set selected driver complete. ndv: {Core Device Install} 09:36:58.133 inf: Opened INF: 'C:\Windows\INF\oem0.inf' ([strings]) inf: Saved PNF: 'C:\Windows\INF\oem0.PNF' (Language = 0409) dvi: {DIF_ALLOW_INSTALL} 09:36:58.164 dvi: Using exported function 'ClassInstall32' in module 'C:\Windows\system32\ntprint.dll'. dvi: Class installer == ntprint.dll,ClassInstall32 dvi: No CoInstallers found dvi: Class installer: Enter 09:36:58.164 dvi: Class installer: Exit dvi: Default installer: Enter 09:36:58.180 dvi: Default installer: Exit dvi: {DIF_ALLOW_INSTALL - exit(0xe000020e)} 09:36:58.180 ndv: Installing files... dvi: {DIF_INSTALLDEVICEFILES} 09:36:58.180 dvi: Class installer: Enter 09:36:58.180 inf: Opened INF: 'C:\Windows\System32\DriverStore\FileRepository\dymo.inf_amd64_neutral_3a631b118b7a5828\dymo.inf' ([strings]) inf: Opened INF: 'C:\Windows\System32\DriverStore\FileRepository\dymo.inf_amd64_neutral_3a631b118b7a5828\dymo.inf' ([strings]) !!! dvi: Class installer: failed(0x00000490)! !!! dvi: Error 1168: Element not found. dvi: {DIF_INSTALLDEVICEFILES - exit(0x00000490)} 09:37:22.063 ndv: Device install status=0x00000490 ndv: Performing device install final cleanup... ! ndv: Queueing up error report since device installation failed... ndv: {Core Device Install - exit(0x00000490)} 09:37:22.063 dvi: {DIF_DESTROYPRIVATEDATA} 09:37:22.063 dvi: Class installer: Enter 09:37:22.063 dvi: Class installer: Exit dvi: Default installer: Enter 09:37:22.063 dvi: Default installer: Exit dvi: {DIF_DESTROYPRIVATEDATA - exit(0xe000020e)} 09:37:22.063 ump: Server install process exited with code 0x00000490 09:37:22.063 ump: {Plug and Play Service: Device Install exit(00000490)} Notice these lines in particular: !!! dvi: Class installer: failed(0x00000490)! !!! dvi: Error 1168: Element not found. dvi: {DIF_INSTALLDEVICEFILES - exit(0x00000490)} 09:37:22.063 ndv: Device install status=0x00000490 From what I have read, the "Element not found" error should be accompanied by an event describing what element was not found. The error that appears in Device Manager is "The driver cannot be installed because it is either not digitally signed or not signed in the appropriate manner." It appears to be signed fine though. It has an accompanying .CAT file and worked previously. And when installing, the following messages are logged in setupapi.dev.log: sto: {DRIVERSTORE_IMPORT_NOTIFY_VALIDATE} 09:36:56.277 inf: Opened INF: 'C:\Windows\System32\DriverStore\Temp\{272e2305-961c-7942-9ede-966f01047043}\dymo.inf' ([strings]) sig: {_VERIFY_FILE_SIGNATURE} 09:36:56.292 sig: Key = dymo.inf sig: FilePath = C:\Windows\System32\DriverStore\Temp\{272e2305-961c-7942-9ede-966f01047043}\dymo.inf sig: Catalog = C:\Windows\System32\DriverStore\Temp\{272e2305-961c-7942-9ede-966f01047043}\DYMO.CAT sig: Success: File is signed in catalog. sig: {_VERIFY_FILE_SIGNATURE exit(0x00000000)} 09:36:56.355 sto: Validating driver package files against catalog 'DYMO.CAT'. sto: Driver package is valid. sto: {DRIVERSTORE_IMPORT_NOTIFY_VALIDATE exit(0x00000000)} 09:36:56.402 sto: Verified driver package signature: sto: Digital Signer Score = 0x0D000005 sto: Digital Signer Name = Microsoft Windows Hardware Compatibility Publisher Now here's where it gets strange. If I take it off the domain, it installs fine. But it doesn't seem to have anything to do with Group Policy. I moved the machine to an OU that blocks inheritance, ran a gpupdate, ran rsop.msc to verify, and tried again. And it still didn't work. Likewise, I removed a machine from the domain, manually set all of the domain Group Policy settings in gpedit.msc, and tried that way, and it worked fine. So it seems like the Group Policy settings are irrelevant. What other domain-related issue could be causing this though? Any ideas on what to try next would be greatly appreciated. I'm not sure where to go from here. Thanks!

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• LinkButtons Created Dynamically in a Repeater Don't Fire ItemCommand Event

  - by 5arx

  Hi. I've got a repeater that's used to display the output of a dynamic report that takes criteria from webcontrols on the page. Within the repeater's ItemDataBound method I'm adding controls (Linkbuttons for sorting by column values) dynamically to the header of the repeater based on values selected in a checkbox list and at this point setting the CommandArgument and CommandName properties of the linkbuttons. The issue is that when the linkbuttons are clicked they don't fire the ItemCommand event although they are clearly being correctly created and added to the header (there is some additional code to set the cssClass, text etc. and this works as expected.) The first column header in the repeater is set in the markup and the itemcommand event fires correctly on this one only. When the other column headers are clicked the repeater rebinds as programmed, but the columns are not dynamically re-generated. I would really appreciate somebody explaining what I'm doing wrong - afaik I'm following the approved way of doing this :-( Simplified code follows: Nightmare.ascx <asp:repeater runat="server" id="rptReport" OnItemDataBound="rptResults_ItemDataBound" OnItemCommand="rptResults_ItemCommand" EnableViewState="true"> <headertemplate> <table> <tr runat="Server" id="TRDynamicHeader"> <th> <!-- This one works --> <asp:Linkbutton runat="server" CommandName="sort" commandArgument='<%# Eval("Name")%?' /> </th> <!-- additional header cells get added dynamically here --> </tr> </headertemplate> <itemTemplate> <td><%# Eval("Name")</td> ... </itemTemplate> </asp:repeater> Nightmare.ascx.cs protected void PageLoad(object sender, eventArgs e){ if (! isPostback){ setupGui();//just binds dropdowns etc. to datasources } } protected void btnRunReport_Click(...){ List<ReportLines> lstRep = GetReportLines(); rptReport.DataSource = lstRep; repReport.DataBind(); } protected void rptReport_ItemDataBound (...){ if (e.Item.ItemType == ListItemType.Header) { foreach (ListItem li in chbxListBusFuncs.Items) { if (li.Selected) { th = new HtmlTableCell(); lb = new LinkButton(); lb.CssClass = "SortColHeader"; lb.CommandArgument = li.Text.Replace(" ", ""); lb.CommandName = "sort"; lb.Text = li.Text; th.Controls.Add(lb); ((HtmlTableRow)e.Item.FindControl("TRDynamicHeader")).Cells.Add(th); } } } if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) { //Row level customisations, totals calculations etc. } } <!-- this only gets called when the 'hardcoded' linkbutton in the markup is clicked. protected void rptReport_ItemCommand(object sender, Eventargs e){ lblDebug.Text = string.Format("Well? What's Happening? -> {0}:{1}", e.CommandName, e.CommandArgument.ToString()); } (The only thing that can call the runreport routine is a single button on the page, not shown in the code snippet above.)

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• Is SQL Server DRI (ON DELETE CASCADE) slow?

  - by Aaronaught

  I've been analyzing a recurring "bug report" (perf issue) in one of our systems related to a particularly slow delete operation. Long story short: It seems that the CASCADE DELETE keys were largely responsible, and I'd like to know (a) if this makes sense, and (b) why it's the case. We have a schema of, let's say, widgets, those being at the root of a large graph of related tables and related-to-related tables and so on. To be perfectly clear, deleting from this table is actively discouraged; it is the "nuclear option" and users are under no illusions to the contrary. Nevertheless, it sometimes just has to be done. The schema looks something like this: Widgets | +--- Anvils (1:1) | | | +--- AnvilTestData (1:N) | +--- WidgetHistory (1:N) | +--- WidgetHistoryDetails (1:N) Nothing too scary, really. A Widget can be different types, an Anvil is a special type, so that relationship is 1:1 (or more accurately 1:0..1). Then there's a large amount of data - perhaps thousands of rows of AnvilTestData per Anvil collected over time, dealing with hardness, corrosion, exact weight, hammer compatibility, usability issues, and impact tests with cartoon heads. Then every Widget has a long, boring history of various types of transactions - production, inventory moves, sales, defect investigations, RMAs, repairs, customer complaints, etc. There might be 10-20k details for a single widget, or none at all, depending on its age. So, unsurprisingly, there's a CASCADE DELETE relationship at every level here. If a Widget needs to be deleted, it means something's gone terribly wrong and we need to erase any records of that widget ever existing, including its history, test data, etc. Again, nuclear option. Relations are all indexed, statistics are up to date. Normal queries are fast. The system tends to hum along pretty smoothly for everything except deletes. Getting to the point here, finally, for various reasons we only allow deleting one widget at a time, so a delete statement would look like this: DELETE FROM Widgets WHERE WidgetID = @WidgetID Pretty simple, innocuous looking delete... that takes over 2 minutes to run, for a widget with no data! After slogging through execution plans I was finally able to pick out the AnvilTestData and WidgetHistoryDetails deletes as the sub-operations with the highest cost. So I experimented with turning off the CASCADE (but keeping the actual FK, just setting it to NO ACTION) and rewriting the script as something very much like the following: DECLARE @AnvilID int SELECT @AnvilID = AnvilID FROM Anvils WHERE WidgetID = @WidgetID DELETE FROM AnvilTestData WHERE AnvilID = @AnvilID DELETE FROM WidgetHistory WHERE HistoryID IN ( SELECT HistoryID FROM WidgetHistory WHERE WidgetID = @WidgetID) DELETE FROM Widgets WHERE WidgetID = @WidgetID Both of these "optimizations" resulted in significant speedups, each one shaving nearly a full minute off the execution time, so that the original 2-minute deletion now takes about 5-10 seconds - at least for new widgets, without much history or test data. Just to be absolutely clear, there is still a CASCADE from WidgetHistory to WidgetHistoryDetails, where the fanout is highest, I only removed the one originating from Widgets. Further "flattening" of the cascade relationships resulted in progressively less dramatic but still noticeable speedups, to the point where deleting a new widget was almost instantaneous once all of the cascade deletes to larger tables were removed and replaced with explicit deletes. I'm using DBCC DROPCLEANBUFFERS and DBCC FREEPROCCACHE before each test. I've disabled all triggers that might be causing further slowdowns (although those would show up in the execution plan anyway). And I'm testing against older widgets, too, and noticing a significant speedup there as well; deletes that used to take 5 minutes now take 20-40 seconds. Now I'm an ardent supporter of the "SELECT ain't broken" philosophy, but there just doesn't seem to be any logical explanation for this behaviour other than crushing, mind-boggling inefficiency of the CASCADE DELETE relationships. So, my questions are: Is this a known issue with DRI in SQL Server? (I couldn't seem to find any references to this sort of thing on Google or here in SO; I suspect the answer is no.) If not, is there another explanation for the behaviour I'm seeing? If it is a known issue, why is it an issue, and are there better workarounds I could be using?

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