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• How to detect segmentation fault details using Valgrind?

  - by Davit Siradeghyan

  Hi all I have a std::map< std::string, std::string which initialized with some API call. When I'm trying to use this map I'm getting segmentation fault. How can I detect invalid code or what is invalid or any detail which can help me to fix problem? Code looks like this: std::map< std::string, std::string> cont; some_func( cont ); // getting parameter by reference and initialize it std::cout << cont[ "some_key" ] << '\n'; // getting segmentation fault here

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• CentOS 6 - Make system aware of custom lib paths and missing base links

  - by Mike Purcell

  I am trying to compile libmemcached (1.0.7) on CentOS6, and keep getting the following warning: ... checking for event.h... no configure: WARNING: Unable to find libevent ... I manually compiled libevent (2.0.19) and built it using the following configure line: OPTIONS="--prefix=/usr/local/_custom/app/libevent" Everything compiled and installed fine, but I couldn't figure out how to make the system aware that the lib files are in the custom /usr/local/_custom/app/libevent/libdir. I stumbled upon an article and read that I can make the system aware of custom lib paths by adding a custom file to /etc/ld.so.conf.d/ directory: # /etc/ld.so.conf.d/customApp.conf /usr/local/_custom/app/libevent/lib Then I issued the ldconfig command and was able to confirm that libevent was included by issuing this command: ldconfig -p | ack -i libevent Seeing that libevent was now included in the ldconfig output, I figured I would be able to compile libmemcached and satisfy the aforementioned warning. Unfortunately it did not. So I took another look at the ldconfig output and noticed this: libevent_pthreads-2.0.so.5 (libc6,x86-64) => /usr/local/_custom/app/libevent/lib/libevent_pthreads-2.0.so.5 libevent_openssl-2.0.so.5 (libc6,x86-64) => /usr/local/_custom/app/libevent/lib/libevent_openssl-2.0.so.5 libevent_extra-2.0.so.5 (libc6,x86-64) => /usr/local/_custom/app/libevent/lib/libevent_extra-2.0.so.5 libevent_core-2.0.so.5 (libc6,x86-64) => /usr/local/_custom/app/libevent/lib/libevent_core-2.0.so.5 libevent-2.0.so.5 (libc6,x86-64) => /usr/local/_custom/app/libevent/lib/libevent-2.0.so.5 There are no references to the base links, for example, I would expect to see links to these (ls -la /usr/local/_custom/app/libevent/lib): libevent.so -> libevent-2.0.so.5.1.7 libevent_openssl.so -> libevent_openssl-2.0.so.5.1.7 libevent_core.so -> libevent_core-2.0.so.5.1.7 So either I am doing something wrong, or the system still does not know where to look to find libevent.so. -- Update #1 -- I wasn't able to get libmemcached to compile without the warning notice, even after trying to compile using the following configure command: ./configure --prefix=/usr/local/_custom/app/libmemcached CFLAGS="-I/usr/local/_custom/app/libevent/include" LDFLAGS="-L/usr/local/_custom/app/libevent/lib" I thought for sure this would work because I am directly passing the include and lib directories to the configure command. But it did not.

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• Simple Linq Dynamic Query question

  - by Dr. Zim

  In Linq Dynamic Query, Scott Guthrie shows an example Linq query: var query = db.Customers. Where("City == @0 and Orders.Count >= @1", "London", 10). OrderBy("CompanyName"). Select("new( CompanyName as Name, Phone)"); Notice the projection new( CompanyName as Name, Phone). If I have a class like this: public class CompanyContact { public string Name {get;set;} public string Phone {get;set;} } How could I essentially "cast" his result using the CompanyContact data type without doing a foreach on each record and dumping it in to a different data structure? To my knowledge the only .Select available is the Dymanic Query version which only takes a string and parameter list.

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• Constant expression with custom object

  - by nils

  I'm trying to use an instant of a custom class as a template parameter. class X { public: X() {}; }; template <class Foo, Foo foo> struct Bar { }; const X x; Bar<X, x> foo; The compiler states that x cannot appear in a constant expression. Why that? There is everything given to construct that object at compile time.

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• Zend Framework: How to include an OR statement in an SQL fetchAll()

  - by Scoobler

  I am trying to build the following SQL statement: SELECT users_table.*, users_data.first_name, users_data.last_name FROM users_table INNER JOIN users_data ON users_table.id = user_id WHERE (users_table.username LIKE '%sc%') OR (users_data.first_name LIKE '%sc%') OR (users_data.last_name LIKE '%sc%') I have the following code at the moment: public function findAllUsersLike($like) { $select = $this-select(Zend_Db_Table::SELECT_WITH_FROM_PART)-setIntegrityCheck(false); $select-where('users_table.username LIKE ?', '%'.$like.'%'); $select-where('users_data.first_name LIKE ?', '%'.$like.'%'); $select-where('users_data.last_name LIKE ?', '%'.$like.'%'); $select-join('users_data', 'users_table.id = user_id', array('first_name', 'last_name')); return $this-fetchAll($select); } This is close, but not right as it uses AND to add the extra WHERE statements, instead of OR. Is there any way to do this as one select? Or should I perform 3 selects and combine the results (alot more overhead?)? P.S. The parameter $like that is past is sanitized so don't need to wory about user input in the code above!

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• Doxygen, too heavy to maintain ?

  - by Phong

  I am currently starting using doxygen to document my source code. I have notice that the syntax is very heavy, every time I modify the source code, I also need to change the comment and I really have the impression to pass too much time modifying the comment for every change I make in the source code. Do you have some tips to document my source code efficiently ? Does some editor (or plugin for existing editor) for doxygen to do the following exist? automatically track unsynchronized code/comment and warn the programmer about it. automatically add doxygen comment format (template with parameter name in it for example) in the source code (template) for every new item PS: I am working on a C/C++ project.

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• LinkButton + showmodaldialog not working

  - by CPM

  What would be the west way to open a window.showModalDialog on linkbutton when updating a form? I have a linkbutton on form that allows me to update the data, I want to be able to check if the data updatedin this case , parameter status of client is active I want to be able to open a window to fill some more information. Public Function OpenWindowRquest(ByVal URL As String) As String If accountMode = "1" Then Return "window.showModalDialog('" & Page.ResolveUrl(Server.UrlEncode(URL)) & "', window,'resizable:yes; scroll:on; status:yes; dialogWidth:750px; dialogHeight:350px; center:yes');" Else accountMode = "" Return "" End If On aspx side I have <asp:LinkButton id="UpdateButton" runat="server" commandName="Update" Text="Update" OnClientClick='<%# OpenWindowRequest("myurl.aspx") %>'></asp:LinkButton> I also tried to call the function OpenWindowRequest on FormUpdating event but it doesnt work, window is not opened.

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• What is the best option for reading Java property files?

  - by Mr Morgan

  Hello I have an application which uses a servlet to read an intialization parameter from web.xml for the location of a property file. The serlvet then creates an instance of a class which stores the location of the file for other programs to read as required. This class has appropriate get and set methods. But my question concerns access to the properties: should the physical property file be read by each program as at runtime or should the properties be stored in memory instead? The properties are not currently altered at runtime but this could change? I've seen various alternative approaches but am not sure which is best. Thanks Mr Morgan

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• How to create "recurData" in Google Calendar? in C#.Net

  - by Pari

  Hi, I want to create recurring events of Calendar using Google API. I am following links: Google Calendar API I am not getting how to create "recurData". I can't modify String and pass it as parameter. Tried DDay.iCal Version 0.80. also. DDay.iCal There are some Example code given.I tried them. I am able to create ".ics" file. But when i pass this file content as "recurData" Getting Error : {"Execution of request failed: http://www.google.com/calendar/feeds/[email protected]/private/full?gsessionid=AHItK5wrSIoJVawFjGt-0g"} My icf File content is: BEGIN:VCALENDAR VERSION:2.0 PRODID:-//DDay.iCal//NONSGML ddaysoftware.com//EN BEGIN:VEVENT CREATED:20100309T132930Z DESCRIPTION:The event description DTEND:20100310T020000 DTSTAMP:20100309T132930Z DTSTART:20100309T080000 LOCATION:Event location SEQUENCE:0 SUMMARY:18 hour event summary UID:396c6b22-277f-4496-bbe1-d3692dc1b223 END:VEVENT BEGIN:VEVENT CREATED:20100309T132930Z DTEND;VALUE=DATE:20100315 DTSTAMP:20100309T132930Z DTSTART;VALUE=DATE:20100314 SEQUENCE:0 SUMMARY:All-day event UID:ac25cdaf-4e95-49ad-a770-f04f3afc1a2f END:VEVENT END:VCALENDAR I made it using "Example6".

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• PHP PDO bindValue() weird problem

  - by TheMagician

  <?php try { $db = new PDO("mysql:host=localhost;dbname=DBNAME", "USER", "PASSWD"); $stmt = $db->prepare("SELECT id, name FROM testdb ORDER BY time DESC LIMIT :index, 10"); $stmt->bindValue(":index", $_GET['index'], PDO::PARAM_INT); $stmt->execute(); while( $r = $stmt->fetch(PDO::FETCH_ASSOC) ) { echo var_dump($r); } } catch( PDOException $e ) { die("Exception"); } The problem is on this line: $stmt-bindValue(":index", $_GET['index'], PDO::PARAM_INT); And the specific parameter is the second one. The code as it is above doesn't work, it doesn't return anything so the while loop isn't executed. If I replace $_GET['index'] with a number, like 10, it works just fine, it returns 10 rows. Echoing $_GET['index'] displays a number, so it should pass a number. I've also tried bindParam, but the result is same. Why isn't this working?

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• Allocate constant memory

  - by Vlad

  I'm trying to set my simulation params in constant memory but without luck (CUDA.NET). cudaMemcpyToSymbol function returns cudaErrorInvalidSymbol. The first parameter in cudaMemcpyToSymbol is string... Is it symbol name? actualy I don't understand how it could be resolved. Any help appreciated. //init, load .cubin float[] arr = new float[1]; arr[0] = 0.0f; int size = Marshal.SizeOf(arr[0]) * arr.Length; IntPtr ptr = Marshal.AllocHGlobal(size); Marshal.Copy(arr, 0, ptr, arr.Length); var error = CUDARuntime.cudaMemcpyToSymbol("param", ptr, 4, 0, cudaMemcpyKind.cudaMemcpyHostToDevice); my .cu file contain __constant__ float param;

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• iPad UIViewController loads as portrait when device is in landscape

  - by jud

  I have an application with 3 view controllers. They are all have shouldAutoRotateToInterfaceOrientation returning YES. The first two, my main menu and my submenu both autorotate just fine. The third viewcontroller, which programatically loads a UIImageView from a jpg file in the program's bundle, will only display in portrait. In the viewcontroller containing the image, i have this: NSString *imageName = [NSString stringWithFormat:@"%@-00%d.jpg",setPrefix,imageNumber]; UIImageView *pictureView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:imageName]]; pictureView.frame = CGRectMake(0, 0, 1024, 768); [self.view addSubview:pictureView]; and again, I have shouldAutoRotateToInterfaceOrientation returning YES for all orientations. My image shows up, but is sideways, and the 0,0,1024,768 values I used to make my rectangle start from the top right corner going down, instead of starting at the top left and going across (holding in landscape). Am I missing a parameter I need to set in order to ensure the imageview shows up in landscape instead of portrait?

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• SQL orderby / case issue: orderdirection fail

  - by Joris

  I got a stored procedure that delivers a table of students, and it needs to order by surname, name etc... it also needs to sort ascending, descending, depending on the parameter @orderby... code: ORDER BY CASE WHEN @orderby = 'studentkey' THEN Studentkey END ASC, CASE WHEN @orderby = 'studentkey' and @desc = 1 THEN Studentkey END DESC, CASE WHEN @orderby = 'initials' THEN Initials END ASC, CASE WHEN @orderby = 'initials' and @desc = 1 THEN Initials END DESC, CASE WHEN @orderby = 'firstname' THEN Firstname END ASC, CASE WHEN @orderby = 'firstname' and @desc = 1 THEN Firstname END DESC, CASE WHEN @orderby = 'nickname' THEN Nickname END ASC, CASE WHEN @orderby = 'nickname' and @desc = 1 THEN Nickname END DESC, CASE WHEN @orderby = 'insertion' THEN Insertion END ASC, CASE WHEN @orderby = 'insertion' and @desc = 1 THEN Insertion END DESC, CASE WHEN @orderby = 'surname' THEN Surname END ASC, CASE WHEN @orderby = 'surname' and @desc = 1 THEN Surname END DESC NED There is a difference in output between @desc = 1 and @desc = 0, but not what i desire... Does anyone have a solution?

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• JVM memory initializazion error after windows update

  - by Pier Luigi

  Hi all, I have three Windows Server 2003 with 2 GB RAM. Server1 tomcat 5.5.25 jvm version SUN 1.6.0_11-b03 Server2 tomcat 5.5.25 jvm version SUN 1.6.0_14-b08 Server3 tomcat 6.0.18 jvm version SUN 1.6.0_14-b08 For the three servers JVM parameters are: -XX:MaxPermSize=256m -Dcatalina.base=C:\Apache Group\apache-tomcat-5.5.25 -Dcatalina.home=C:\Apache Group\apache-tomcat-5.5.25 -Djava.endorsed.dirs=C:\Apache Group\apache-tomcat-5.5.25\common\endorsed -Djava.io.tmpdir=C:\Apache Group\apache-tomcat-5.5.25\temp vfprintf -Xms512m -Xmx1024m For some months everithing worked fine. Last friday we installed some windows updates. After the reboot tomcat doesn't start anymore, with error: Error occurred during initialization of VM Could not reserve enough space for object heap We reduced the parameter -Xmx1024m to -Xmx768m and now tomcat starts. But we need greater max heap size What happened to our servers ? Thanks in advance.

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• Java App Engine - ranked counter

  - by Richard

  I understand the sharded counter, here: http://code.google.com/appengine/articles/sharding_counters.html The problem is that a simple counter will not work in my application. I am sorting my entities by a particular variable so I am returned not so much a count, but more of a rank. My current method is: SELECT COUNT(this) FROM Entity.class WHERE value <= ? Result + 1 is then the rank of the parameter in relation to the value variable in the persistent Entity objects. The limitation of this is the highest rank being returned is 1001 because count() can give a maximum of 1000. The reason I cannot store the rank on the Entity object is that the ranks are updated very often, and re-setting this rank variable would be much too costly. Any ideas on the best way to accomplish this?

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• Quadratic bezier curve: Y coordinate for a given X ?

  - by stefan.at.wpf

  Hello, I have a quadratic bezier curve and I need the Y coordinate of a point on the bezier curve for a given X coordinate. I know that in pure maths this can be easily done, but I'm wondering is there's a simple / another way for this in C# / WPF? Is it possible to get the single points used by C# / WPF for drawing the bezier curve and then maybe just loop them and compare the X coordinate of each point with the given X coordinate? BTW for the mathematical way it would be good to know which step for the parameter t of the bezier curve has been choosen by C# / WPF? Any chance to find this out? Probably t is just scaled by / steps for t are 1/(distance of P0 and P2) ? Thank you very much for any hint!

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• How to set up jndi.properties for DataStore?

  - by FarmBoy

  I'm struggling to set connect a Java program to MySQL using JPA/Hibernate. I'm currently getting the following error when I try to call createEntityManagerFactory(): [main] ERROR org.hibernate.connection.DatasourceConnectionProvider - Could not find datasource: java:jdbc/myDataDS javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:645) at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288) at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:325) at javax.naming.InitialContext.lookup(InitialContext.java:392) at org.hibernate.connection.DatasourceConnectionProvider.configure(DatasourceConnectionProvider.java:75) Googling seems to indicate that I need a jndi.properties file in META-INF in my classpath, but I can't seem to find any information about what that file should contain in my case.

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• How do I specify table data only for the current user's ID (VWD asp.net 3.5) ?

  - by Greg McNulty

  I'm using the Details View control of VWD asp.net 2008 I have a users database table and one of the columns contain the "unique" user's profile ID, created by VWD from the automatic profiles table. From my table, I would like to select only the data pertaining to the logged in user. How do I get the current unique user profileID and then have that used for the query? What I have so far: In the configure data source option of the control I select the columns I would like to display, select the check box for "Return Only Unique IDs" and the WHERE option. In this new window I select the Column to the profile userID ... "=" and then assumed I should select Source: "Profile". Now what should the parameter properties or value be to select only the logged userID specific data of the table? Any help is appreciated. Thank You!

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• Specify an inline callback function as an argument.

  - by Matthias Vance

  LS, Let me first explain what I'm trying to achieve using some pseudo-code (JavaScript). // Declare our function that takes a callback as as an argument, and calls the callback with true. B(func) { func(true); } // Call the function B(function(bool success) { /* code that uses success */ }); I hope this says it all. If not, please comment on my question so I can write a little more to clarify my issue. What I want is to have code like this in C++. I have tried to use lambda functions, but I was unable to specify a parameter type for those. Kind regards, Matthias Vance

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• google maps, cellid to location

  - by Dels

  According to this sample: http://www.codeproject.com/KB/mobile/DeepCast.aspx It's possible to request a gps coordinate (longitude & latitude) including range when sending cellid information (MCC, MNC, towerid, etc) Can someone tell me the actual parameter to request/post to this address? http://www.google.com/glm/mmap It could be something like this http://www.google.com/glm/mmap?mcc=xxx&mnc=xxx&towerid=xxx And i would like to know what response we would get. I have observe OpenCellid website and they provide some nice API to begin with, but i want to know about that in google map too (since they have more completed database). OpenCellID API

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• Should I supress CA1062: Validate arguments of public methods?

  - by brickner

  I've recently upgraded my project to Visual Studio 2010 from Visual Studio 2008. In Visual Studio 2008, this Code Analysis rule doesn't exist. Now I'm not sure if I should use this rule or not. I'm building an open source library so it seems important to keep people safe from doing mistakes. However, if all I'm going to do is throw ArgumentNullException when the parameter is null, it seems like writing useless code since ArgumentNullException will be thrown even if I won't write that code. Should I remove that rule or fix the violations?

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• GWT uibinder composite

  - by Han Fastolfe

  I'm creating a composite uibinder widget with a Label and a TextBox. The intented use is: <x:XTextBox ui:field="fieldName" label="a caption" > The text to be put in the box. </x:XTextBox> I've found how to catch the label with a custom @UiConstructor constructor, I might add another parameter to the constructor, but I would like to know how to get the text from the xml, just like the GWT tag <g:Label>a caption</g:Label> does. Any help is greatly appreciated.

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• How to create named pipe (mkfifo) in Android?

  - by Ignas Limanauskas

  I am having trouble in creating named pipe in Android and the example below illustrates my dilemma: res = mkfifo("/sdcard/fifo9000", S_IRWXO); if (res != 0) { LOG("Error while creating a pipe (return:%d, errno:%d)", res, errno); } The code always prints: Error while creating a pipe (return:-1, errno:1) I can't figure out exactly why this fails. The application has android.permission.WRITE_EXTERNAL_STORAGE permissions. I can create normal files with exactly the same name in the same location, but pipe creation fails. The pipe in question should be accessible from multiple applications. I suspect that noone can create pipes in /sdcard. Where would it be the best location to do so? What mode mast should I set (2nd parameter)? Does application need any extra permissions?

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• Csharp component which generates fragments with highlights for diffs for 2 strings

  - by MicMit

  I need C# implementation ( ideally open source ) which is similar to Delphi DLL. I am currently using the wrapper ( C# syntax is provided , but it is a call from a different language ) zdiff( string ref str1, string ref str2, int range , int trim ) it calls inside str1 = GetHiDiff(@str1,1,trim) str2 = GetHiDiff(@str1,2,trim) where function GetHiDiff(s:pchar; sIndex:integer; wtrim:integer): pchar; stdcall; What it does it returns a left fragment html of str1 and a right html fragment of str2 with diffs highlighted as strings are passed by reference. Range parameter determines the size of html fragment. Not sure what trim 0 does.

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• Regression tests for T-SQL stored procedures

  - by Achim

  Hi, I would like to regression test t-sql stored procedures. My idea is to specify for each SP multiple input parameter sets. The SP should be executed with these parameters, results should be written to disc. Next time the new results should be compared with results stored before. Does anybody know a good tool for something like that? Should not be that hard to implement, but in practice you will need functionality like "ignore that column" or something like that. And I would assume that such a tool should already exist!? cheers, Achim

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