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• Java error: Bad version number in .class file error when trying to run Cassandra on OS X

  - by Sam Lee

  I am trying to get Cassandra to work on OS X. When I run bin/cassandra, I get the following error: ~/apache-cassandra-incubating-0.4.1-src > bin/cassandra -f Listening for transport dt_socket at address: 8888 Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:675) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) at java.net.URLClassLoader.defineClass(URLClassLoader.java:260) at java.net.URLClassLoader.access$100(URLClassLoader.java:56) at java.net.URLClassLoader$1.run(URLClassLoader.java:195) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:316) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:280) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:374) From what I could determine by searching, this error is related to incompatible versions of Java. However, as far as I can tell, I have the latest version of Java: ~/apache-cassandra-incubating-0.4.1-src > java -version java version "1.6.0_13" Java(TM) SE Runtime Environment (build 1.6.0_13-b03-211) Java HotSpot(TM) 64-Bit Server VM (build 11.3-b02-83, mixed mode) ~/apache-cassandra-incubating-0.4.1-src > javac -version javac 1.6.0_13 ~/Downloads/apache-cassandra-incubating-0.4.1-src > echo $JAVA_HOME /System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home Any ideas on what I'm doing wrong?

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• CQRS - The query side

  - by mattcodes

  A lot of the blogsphere articles related to CQRS (command query repsonsibility) seperation seem to imply that all screens/viewmodels are flat. e.g. Name, Age, Location Of Birth etc.. and thus the suggestion that implementation wise we stick them into fast read source etc.. single table per view mySQL etc.. and pull them out with something like primitive SqlDataReader, kick that nasty nhibernate ORM etc.. However, whilst I agree that domain models dont mapped well to most screens, many of the screens that I work with are more dimensional, and Im sure this is pretty common in LOB apps. So my question is how are people handling screen where by for example it displays a summary of customer details and then a list of their orders with a [more detail] link etc.... I thought about keeping with the straight forward SQL query to the Query Database breaking off the outer join so can build a suitable ViewModel to View but it seems like overkill? Alternatively (this is starting to feel yuck) in CustomerSummaryView table have a text/big (whatever the type is in your DB) column called Orders, and the columns for the Order summary screen grid are seperated by , and rows by |. Even with XML datatype it still feeel dirty. Any thoughts on an optimal practice?

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• Display Special Characters (Korean Letters) in RichTextBox

  - by Peter Lee

  Hi, My question might be a little bit confusing, but I think it's still worth of paying some attention. Basically I'm designing a program to display all printable Unicode characters in a RichTextBox. I'm using VC# 2010 Express Edition. However, the RichTextBox has a critical problem: some special characters cannot be displayed correctly. For example, some Korean Characters (??????????????????????????????), can be displayed correctly in Microsoft Word. After I copy to the RichTextBox, the characters cannot be displayed correctly. However, when I copy back to Microsoft Word, it can be displayed correctly. Therefore, it's a display problem (the characters themselves are correct). I guess it might be a font problem. Some related property info: RichTextBox.Font.GdiChaSet RichTextBox.Font How can I solve it? So that all printable Unicode characters can be displayed correctly (using different fonts for different CharSets are acceptable). Actually, I need further assistance about removing all formatting when pasting rtbxFileContent.Paste(DataFormats.GetFormat(DataFormats.Text)); // DataFormats.UnicodeText I still need to have all printable characters to be displayed correctly, but without any formatting (except font). Thanks. Hope I made myself understood.

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• Right way to dispose Image/Bitmap and PictureBox

  - by kornelijepetak

  I am trying to develop a Windows Mobile 6 (in WF/C#) application. There is only one form and on the form there is only a PictureBox object. On it I draw all desired controls or whatever I want. There are two things I am doing. Drawing custom shapes and loading bitmaps from .png files. The next line locks the file when loading (which is an undesired scenario): Bitmap bmp = new Bitmap("file.png"); So I am using another way to load bitmap. public static Bitmap LoadBitmap(string path) { using (Bitmap original = new Bitmap(path)) { return new Bitmap(original); } } This is I guess much slower, but I don't know any better way to load an image, while quickly releasing the file lock. Now, when drawing an image there is method that I use: public void Draw() { Bitmap bmp = new Bitmap(240,320); Graphics g = Graphics.FromImage(bmp); // draw something with Graphics here. g.Clear(Color.Black); g.DrawImage(Images.CloseIcon, 16, 48); g.DrawImage(Images.RefreshIcon, 46, 48); g.FillRectangle(new SolidBrush(Color.Black), 0, 100, 240, 103); pictureBox.Image = bmp; } This however seems to be some kind of a memory leak. And if I keep doing it for too long, the application eventually crashes. Therefor, I have X questions: 1.) What is the better way for loading bitmaps from files without locking the file? 2.) What objects needs to be manually disposed in the Draw() function (and in which order) so there's no memory leak and no ObjectDisposedException throwing? 3.) If pictureBox.Image is set to bmp, like in the last line of the code, would pictureBox.Image.Dispose() dispose only resources related to maintaining the pictureBox.Image or the underlying Bitmap set to it?

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• Installing SQLServer 2005 on Windows 7 64bit

  - by Mostafa

  Hi , It's 3 days I'm trying to install SqlServer 2005 under Windows 7 64 bit on my machine . First let me tell you what I've done and what I've got till now . 1-I Installed Windows 7 64 Bit on my computer 2-I tried to install SQl Server 2005 "Developer Edition" 2.1 But in "System Configuration Check" Page i recieved 2 warning , One for "IIS Feature Requirement" and another for "ASP.NET Version Registration Rquired" . 2.1.1 . I installed "Internet Information Services" from "Turn Windows features on or off" section in control panel 2.1.2 I Enabled reporting service 32 bit from "Inetpub= AdminScripts = adsutil.vbs 2.2 At this stage There was no waring in System Configuration Check 3- So I installed SQl Server 2005 Developer Edition By all default settings 4- I installed Sql Server 2005 Service Pack 3 64 bit Now when when i run "Management Studio" There is no name in "Server name" section . I typed my Computer name Or "." and i got this Error : A network -related instance-specific error occurred while establishinga connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (Provider: Named Pipes Provider , error :40 - Could not open a connection to SQL Server ) ( Microsoft SQL Server , Error :2) . I googled some for this Error and some people said follow this instruction: Startsql server 2005Configuration toolsSql Server Surface Configuration AreaSurface Area Configuration for services and Connections But i got this Error : No SQl SErver 2005 Components were found on the specified computer . Either no components are installed , or you are not a administrator on this computer (SQLSAC) I'm really tired because of that , and i don't know what's wrong with this . Some more information : I have no additonal software on my computer , like Antivirus or Proxy I tried all step with "Standard Edition" either , but no difference My user is Administrator I tried more than 5 times all those steps including re-installing Windows 7 . Please help me , I'm losing all my hair

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• NPTL Default Stack Size Problem

  - by eyazici

  Hello, I am developing a multithread modular application using C programming language and NPTL 2.6. For each plugin, a POSIX thread is created. The problem is each thread has its own stack area, since default stack size depends on user's choice, this may results in huge memory consumption in some cases. To prevent unnecessary memory usage I used something similar to this to change stack size before creating each thread: pthread_attr_t attr; pthread_attr_init (&attr); pthread_attr_getstacksize(&attr, &st1); if(pthread_attr_setstacksize (&attr, MODULE_THREAD_SIZE) != 0) perror("Stack ERR"); pthread_attr_getstacksize(&attr, &st2); printf("OLD:%d, NEW:%d - MIN: %d\n", st1, st2, PTHREAD_STACK_MIN); pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); /* "this" is static data structure that stores plugin related data */ pthread_create(&this->runner, &attr, (void *)(void *)this->run, NULL); EDIT I: pthread_create() section added. This did not work work as I expected, the stack size reported by pthread_attr_getstacksize() is changed but total memory usage of the application (from ps/top/pmap output) did not changed: OLD:10485760, NEW:65536 - MIN: 16384 When I use ulimit -s MY_STACK_SIZE_LIMIT before starting application I achieve the expected result. My questions are: 1-) Is there any portable(between UNIX variants) way to change (default)thread stack size after starting application(before creating thread of course)? 2-) Is it possible to use same stack area for every thread? 3-) Is it possible completely disable stack for threads without much pain?

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• Long running stats process - thoughts on language choice?

  - by Josh

  I am on a LAMP stack for a website I am managing. There is a need to roll up usage statistics (a variety of things related to our desktop product), and I initially tackled the problem with PHP (being that I had a bunch of classes to work with the data already). All worked well on my dev box which was using 5.3 Long story short, 5.1 memory management seems to suck a lot worse, and I've had to do a lot of fooling to get the long term roll up scripts to run in a fixed memory space. Our server guys are unwilling to upgrade php at this time. I've since moved my dev server back to 5.1 so I don't run into this problem again... For mining of mysql databases to roll up statistics for different periods and resolutions, potentially running a process that does this all the time in the future (as opposed to on a cron schedule), what language choice do you recommend? I was looking at python (I know it more or less), java (don't know it that well), sticking it out with php (know it quite well). Thanks for any suggestions. Josh

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• Call webservice from Android using KSoap simply returning "error" string

  - by w00tfest99

  I'm trying to use ksoap to call a simple webservice. I followed this video to try to get started. When I call "getResponse()" on the envelope I just get the string "Error". There's no exceptions thrown or any other detail. I've successfully connected to a simple webservice I just setup on my local machine. Could this potentially be related to being behind a proxy server here at work? My code is below: String SOAP_ACTION="http://tempuri.org/CelsiusToFahrenheit"; String METHOD_NAME = "CelsiusToFahrenheit"; String NAMESPACE = "http://tempuri.org"; String URL = "http://w3schools.com/webservices/tempconvert.asmx"; SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME); PropertyInfo pi = new PropertyInfo(); pi.setName("Celsius"); pi.setValue("32"); request.addProperty(pi); SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11); envelope.dotNet = true; envelope.setOutputSoapObject(request); HttpTransportSE aht = new HttpTransportSE(URL); try { aht.call(SOAP_ACTION, envelope); SoapPrimitive results = (SoapPrimitive)envelope.getResponse(); } catch (Exception e) { e.printStackTrace(); }

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• How to access the remote OPC server programatically ?

  - by Shailesh Jaiswal

  I have downloaded & installed the OPCDA.NET client component evaluation & XMLDA.NET client component evaluation. It provides some C# samples for browsing the available OPC Server, connecting to the OPC server, & browsing the available items on the server. I know the programatic way in which we can access the local OPC server. It is provided in the sample C# applications. I have installed the OPC server on another machine ( remote machine ). I have done all the required setting related to the 'dcomcnfg' utility. I can access the remote OPC server from client machine by using the Test Client provided by the OPCDA.NET client component evaluation & XMLDA.NET client component evaluation. But I am unaware of how this can be done programmatically. In the available C# samples I found no such programatic part (coding ) in which we can access the remote OPC server. Can you provide me the code through which I can browse the available remote machines in my network, available OPC server on each machine after selecting the specific machine name, connecting to the OPC server & browsing the available items on the server ? or Can you provide me the any link through which I can resolve the above issue ?

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• In Mercurial, what is the exact step that Peter or me has to do so that he gets back the rolled back

  - by Jian Lin

  The short question is: if I hg rollback, how does Peter get my rolled back version if he cloned from me? What are the exact steps he or me has to do or type? This is related to http://stackoverflow.com/questions/3034793/in-mercurial-when-peter-hg-clone-me-and-i-commit-and-he-pull-and-update-he-g The details: After the following steps, Mary has 7 and Peter has 11. My repository is 7 What are the exact steps Peter or me has to do or type SO THAT PETER GETS 7 back? F:\>mkdir hgme F:\>cd hgme F:\hgme>hg init F:\hgme>echo the code is 7 > code.txt F:\hgme>hg add code.txt F:\hgme>hg commit -m "this is version 1" F:\hgme>cd .. F:\>hg clone hgme hgpeter updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved F:\>cd hgpeter F:\hgpeter>type code.txt the code is 7 F:\hgpeter>cd .. F:\>cd hgme F:\hgme>notepad code.txt [now i change 7 to 11] F:\hgme>hg commit -m "this is version 2" F:\hgme>cd .. F:\>cd hgpeter F:\hgpeter>hg pull pulling from f:\hgme searching for changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files (run 'hg update' to get a working copy) F:\hgpeter>hg update 1 files updated, 0 files merged, 0 files removed, 0 files unresolved F:\hgpeter>type code.txt the code is 11 F:\hgpeter>cd .. F:\>cd hgme F:\hgme>hg rollback rolling back last transaction F:\hgme>cd .. F:\>hg clone hgme hgmary updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved F:\>cd hgmary F:\hgmary>type code.txt the code is 7 F:\hgmary>cd .. F:\>cd hgpeter F:\hgpeter>hg pull pulling from f:\hgme searching for changes no changes found F:\hgpeter>hg update 0 files updated, 0 files merged, 0 files removed, 0 files unresolved F:\hgpeter>type code.txt the code is 11 F:\hgpeter>

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• Update table columns bound to NSArrayController

  - by Loz

  Hi, I'm fairly new to the world of bindings in cocoa, and I'm having some troubles (perhaps/probably due to a misunderstanding). I have a singleton that contains an NSMutableArray called plugins, containing objects of class Plugin. It has a method called loadPlugins which adds objects to the plugins array. This may be called at any point. It's been added as an instance in Interface Builder. Also in IB is an NSObjectController, whose content outlet is connected to the singleton. There is also an NSArrayController, whose contentArray is bound to the NSObjectController (controller key is 'selection', model key path is 'plugins', object class name is 'Plugin'). And finally I have a table view with 2 columns, the values of which are bound to the NSArrayController's arrangedObjects, using keys of properties in the Plugin class. So far so standard (as far as I can tell from tutorials at least). My trouble is that when the loadPlugins method is called in the singleton, and objects are added to the plugins array, the table doesn't update to show the objects (unless loadPlugins is called before the nib is loaded). -reloadData called on the tableView doesn't do anything. Is there a way to tell the NSArrayController that the referenced array has been updated? I understand there is the -add: method for NSArrayController, which could be used in the loadPlugins, but this isn't desirable as I want to keep the singleton totally separate from the display aspect. This seems related to: http://stackoverflow.com/questions/1623396/refresh-cocoa-binding-nsarraycontroller-combobox The line: "editing the array behind the controller's back" seems to perhaps pinpoint the problem, but I would hope that it would be possible to have the singleton not know about the controller. Thanks in advance.

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• What are some strategies for maintaining a common database schema with a team of developers and no D

  - by Mahmoud Abdelkader

  I'm curious about how others have approached the problem of maintaining and synchronizing database changes across many (10+) developers without a DBA? What I mean, basically, is that if someone wants to make a change to the database, what are some strategies to doing that? (i.e. I've created a 'Car' model and now I want to apply the appropriate DDL to the database, etc..) We're primarily a Python shop and our ORM is SQLAlchemy. Previously, we had written our models in such a way to create the models using our ORM, but we recently ditched this because: We couldn't track changes using the ORM The state of the ORM wasn't in sync with the database (e.g. lots of differences primarily related to indexes and unique constraints) There was no way to audit database changes unless the developer documented the database change via email to the team. Our solution to this problem was to basically have a "gatekeeper" individual who checks every change into the database and applies all accepted database changes to an accepted_db_changes.sql file, whereby the developers who need to make any database changes put their requests into a proposed_db_changes.sql file. We check this file in, and, when it's updated, we all apply the change to our personal database on our development machine. We don't create indexes or constraints on the models, they are applied explicitly on the database. I would like to know what are some strategies to maintain database schemas and if ours is seems reasonable. Thanks!

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• No coverage for runtime with Devel::Cover and ModPerl::Registry

  - by codeholic

  When I'm running Devel::Cover with ModPerl::Registry, I get no coverage info except for BEGIN blocks. When I'm running the same script with Devel::Cover from command line or as a CGI, everything works alright (obviously). How can I make Devel::Cover "see" my code being executed in the runtime? Here's Devel::Cover related stuff in my httpd.conf: MaxClients 1 PerlSetEnv DEVEL_COVER_OPTIONS -db,/tmp/cover_db,silent,1 PerlRequire /var/www/project/startup.pl Here's startup.pl: #!/usr/bin/perl use strict; use warnings; use Apache2::Directive (); use File::Basename (); use File::Find (); BEGIN { # Devel::Cover database must be writable by worker processes my $conftree = Apache2::Directive::conftree->as_hash; my $name = $conftree->{User} or die "couldn't find user in Apache config"; print "user=$name\n"; my $uid = getpwnam($name); defined $uid or die "couldn't determine uid by name"; no warnings 'redefine'; local $> = $uid; require Devel::Cover; my $old_report = \&Devel::Cover::report; *Devel::Cover::report = sub { local $> = $uid; $old_report->(@_) }; Devel::Cover->import; } 1; (As you may see, I made a monkey patch for Devel::Cover since startup.pl is being run by root, but worker processes run under a different user, and otherwise they couldn't read directories created by startup.pl. If you know a better solution, make a note, please.)

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• WPF UI Automation - AutomationElement.FindFirst fails when there are lots of elements

  - by Orion Edwards

  We've got some automated UI tests for our WPF app (.NET 4); these test use the UI Automation API's. We call AutomationElement.FindFirst to find a target element, and then interact with it. Example (pseudocode): var nameEquals = new PropertyCondition(AutomationElement.NameProperty, "OurAppWindow"); var appWindow = DesktopWindow.FindFirst(TreeScope.Children, nameEquals); // this succeeds var idEquals = new PropertyCondition(AutomationElement.AutomationIdProperty, "ControlId"); var someItem = appWindow.FindFirst(TreeScope.Descendants, idEquals); // this suceeds sometimes, and fails sometimes! The problem is, the appWindow.FindFirst will sometimes fail and return null, even when the element is present. I've written a helper function which walks the UI automation tree manually and prints it out, and the element with the correct ID is present in all cases. It seems to be related to how many other items are also being displayed in the window. If there are no other items then it always succeeds, but when there are many other complex UI elements being displayed alongside it, then the find fails. I can't find any documented element limit mentioned for any of the automation API's - is there some way around this? I'm thinking I might have to write my own implemententation of FindFirst which does the tree walk manually itself... As far as I can tell this should work, because my tree-printer utility function does exactly that, and it's ok, but it seems like this would be unnecessary and slow :-( Any help would be greatly appreciated

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• An error has occurred opening extern DTD (w3.org, xhtml1-transitional.dtd). 503 Server Unavailable

  - by Cheeso

  I'm trying to do xpath queries over an xhtml document. The document looks like this: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head> .... </head> <body> ... </body> </html> Because the document includes various char entities (&nbsp; and so on), I need to use the DTD, in order to load it with an XmlReader. So my code looks like this: var reader = XmlReader.Create(sr, new XmlReaderSettings { ProhibitDtd = false }); But when I run this, it returns An error has occurred while opening external DTD 'http://www.w3.org/TR/xhtml1-transitional.dtd': The remote server returned an error: (503) Server Unavailable. Now, I know why I am getting the 503 error. W3C explained it very clearly. But I still want to validate the document. How can I validate with the DTD, and get the entity definitions, without hitting the w3.org website? related: - java.io.IOException: Server returned HTTP response code: 503

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• Crosstab/Cube/Pivot Components for Delphi

  - by Anagoge

  I'm looking for a Delphi VCL crosstab/cube/pivotcube/olap grid component for Delphi 2009, 2010, or XE. I'm willing to sacrifice advanced features to get something open/free (or very cheap if I must) to make it easier to collaborate with any future developers without anyone having to purchase more components than I already use, since this will just be used in one screen. If there isn't anything appropriate out there, I may try to implement something simple on my own. I can live with some fairly basic features: drag and drop to configure dimensions, sort by a column, allow totals/min/max for a column, and (optionally) expand/collapse or drill down to sub-categories. Blazing performance and enterprise scalability are not required, since there should be less than 2000 source rows. There appear to be several decent options in the commercial space (ExpressPivotCube, FastCube, HierCube), but they are all a few hundred dollars. This project already uses existing installations of Excel 2007 and SQL Server 2005/2008, so I might consider leveraging those, though I'd prefer a native Delphi component, if possible. There are also the very old Decision Cube components included in Delphi's Source\xtab directory, but they apparently no longer support unicode compilers (Delphi 2009+), since I got dozens of unicode-related compilation errors while test compiling that source in Delphi XE. Those components also still link to the long-deprecated BDE! Has anyone modified Decision Cube to support unicode/pure-TDataSet? The online tutorials I found were incomplete and silent on the dozens of BDE/unicode compilation errors I see, so I might have to tackle that on my own. Does anyone have suggestions where to start for a free/cheap basic crosstab/pivot grid component?

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• Can I avoid explicit 'self'?

  - by bguiz

  I am fairly new to Python and trying to pick it up, so please forgive if this question has a very obvious answer! I have been learning Python by following some pygame tutorials. Therein I found extensive use of the keyword self, and coming from a primarily Java background, I find that I keep forgetting to type self. For example, instead of self.rect.centerx I would type rect.centerx, because, to me, rect is already a member variable of the class. The Java parallel I can think of for this situation is having to prefix all references to member variables with this. Am I stuck prefixing all member variables with self, or is there a way to declare them that would allow me to avoid having to do so? Even if what I am suggesting isn't "pythonic", I'd still like to know if it is possible. I have taken a look at these related SO questions, but they don't quite answer what I am after: Python - why use “self” in a class? Why do you need explicitly have the “self” argument into a Python method?

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• Binding DataGridComboBoxColumn to a one to many entity framework relation

  - by Cristian

  I have two tables in the model, one table contains entries related to the other table in a one to many relations, for example: Table User ID Name Table Comments ID UserID Title Text I want to show a datagrid in a WPF window with two columns, one text column with the User name and another column with a combobox showing all the comments made by the user. The datagrid definition is like this: <DataGrid AutoGenerateColumns="False" [layout options...] Name="dataGrid1" ItemsSource="{Binding}"> <DataGrid.Columns> <DataGridTextColumn Header="Name" Binding="{Binding Path=Name}"/> <DataGridComboBoxColumn Header="Comments" SelectedValueBinding="{Binding Path=UserID}" SelectedValuePath="ID" DisplayMemberPath="Title" ItemsSource="{Binding Path=Comments}" /> </DataGrid.Columns> </DataGrid> in the code I assign the DataContext like this: dataGrid1.DataContext = entities.Users; The entity User has a property named Comments that leads to all the comments made by the user. The queries are returning data and the user names are shown but the combobox is not being filled. May be the approach is totally wrong or I'm just missing a very simple point here, I'm opened to learn better methods to do this. Thanks

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• NSIS takes ownership of IIS system files

  - by Lucas

  I recently encountered an issue with NSIS that I believe is related to an interaction with UAC, but I am at a loss to explain it and I do not know how to prevent it in the future. I have an installer that creates and removes IIS virtual directories using the NsisIIS plugin. The installer appeared worked correctly on my Windows 7 workstation. When the installer was run on a Windows 2008 R2 server it installed properly, but the uninstaller removed all of the virtual directories and put IIS is an unusable state; to the point that I had to remove the Default Web Site and re-add it. What I eventually found was that all of the IIS configuration files under C:\Windows\System32\inetsrv\config had a lock icon on them. Some investigation seem to indicate that this means a user account has taken ownership of the file, however all the files listed SYSTEM as the file owner. I did check a different server that I have not run the installer on, and it does not have the lock icon applied to the IIS files. I have also seen the same lock icon appear on other files that the NSIS installer creates. For instance, I have a Web.Config.tpl file that is processed using the NSIS ReplaceInFile which also appears with the lock icon after the installer finished. After I explicitly grant another user account access to the file, the lock icon goes away. I run the installer under the local Administrator account on the 2008 R2 server, so I do not get the UAC prompt. Here is the relevant code from the install.nsi file RequestExecutionLevel admin Section "Application" APP_SECTION SectionIn RO Call InstallApp SectionEnd Section "un.Uninstaller Section" Delete "$PROGRAMFILES\${PROGRAMFILESDIR}\Uninstall.exe" Call un.InstallApp SectionEnd Function InstallApp File /oname=Web.Config Web.Config.tpl !insertmacro ReplaceInFile Web.Config %CONNECTION_STRING% $CONNECTION_STRING FunctionEnd Function un.InstallApp ReadRegStr $0 HKLM "Software\${REGKEY}" "VirtualDir" NsisIIS::DeleteVDir "$0" Pop $0 FunctionEnd I have three questions stemming from this incident: How did this happen? How can I fix my installer to prevent it from happening again? How can I repair the permissions on the IIS config files.

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• Using ThreadPool.QueueUserWorkItem in ASP.NET in a high traffic scenario

  - by Michael Hart

  I've always been under the impression that using the ThreadPool for (let's say non-critical) short-lived background tasks was considered best practice, even in ASP.NET, but then I came across this article that seems to suggest otherwise - the argument being that you should leave the ThreadPool to deal with ASP.NET related requests. So here's how I've been doing small asynchronous tasks so far: ThreadPool.QueueUserWorkItem(s => PostLog(logEvent)) And the article is suggesting instead to create a thread explicitly, similar to: new Thread(() => PostLog(logEvent)){ IsBackground = true }.Start() The first method has the advantage of being managed and bounded, but there's the potential (if the article is correct) that the background tasks are then vying for threads with ASP.NET request-handlers. The second method frees up the ThreadPool, but at the cost of being unbounded and thus potentially using up too many resources. So my question is, is the advice in the article correct? If your site was getting so much traffic that your ThreadPool was getting full, then is it better to go out-of-band, or would a full ThreadPool imply that you're getting to the limit of your resources anyway, in which case you shouldn't be trying to start your own threads? Clarification: I'm just asking in the scope of small non-critical asynchronous tasks (eg, remote logging), not expensive work items that would require a separate process (in these cases I agree you'll need a more robust solution).

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• Python equivalent of IDL's stop and .reset

  - by Jamie

  Hi there, I'm relatively new to python but have a bit of experience using IDL. I was wondering if anyone knows if there are equivalent commands in python for IDL's stop and .reset commands. If I'm running some IDL script I wrote that I put a stop command in, essentially what it does is stop the script there and give me access to the command line in the middle of the script. So I have access to all the functions and variables that I defined before the stop command, which I find really useful for debugging. The .reset command I find extremely useful too. What it does is reset the the IDL environment (clears all variables, functions, etc.). It's as if I closed that session and opened a new one, but without having to exit and restart IDL. I find that if I'm trying to debug a script I wrote it's useful sometimes to start from scratch and not have to reset IDL (or python now). It would be useful also in python to be able to un-import any modules I had previously imported. Any help with these issues would be greatly appreciated. Cheers Related Python Drop into REPL Is it possible to go into ipython from code?

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• Can't connect to SQL Server 2008 - looks like Shared Memory problem

  - by Proposition Joe

  I am unable to connect to my local instance of SQL Server 2008 Express using SQL Server Management Studio. I believe the problem is related to a change I made to the connection protocols. Before the error occurred, I had Shared Memory enabled and Named Pipes and TCP/IP disabled. I then enabled both Named Pipes and TCP/IP, and this is when I started experiencing the problem. When I try to connect to the server with SSMS (with either my SQL server sysadmin login or with windows authentication), I get the following error message: A connection was successfully established with the server, but then an error occurred during the login process. (provider: Named Pipes Provider, error: 0 - No process is on the other end of the pipe.) (Microsoft SQL Server, Error: 233) Why is it returning a Named Pipes error? Why would it not just use Shared Memory, as this has a higher priority order in the list of connection protocols? It seems like it is not listening on Shared Memory for some reason? When I set Named Pipes to enabled and try to connect, I get the same error message. My windows account is does not have administrator priviliges on my computer - perhaps this is making a difference in some way (as some of the discussions in this post about an "SuperSocketNetLib\Lpc" registry key seems to suggest).

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• Fade HTML element with raw javascript

  - by jnkrois

  It's my second question of the day related to the same problem, so I apologize for that. I was able to put together a function to "fade out" an element, and it works just fine, my problem is that when I try to reverse it, so the element "fades in" it does not work. I've tried to change the obvious, but I can't understand what I'm doing wrong. My code so far is as follows: Given I have a "div" like so: <div id="test" style="width:200px; height:200px; display:block; opacity:1; background-color:red;"></div> The JavaScript function that I'm using to fade it out is: var getElement = document.getElementById('test'); function fadeOut(elem, speed){ if(!elem.style.opacity){ elem.style.opacity = 1; } var desvanecer = setInterval(function(){ elem.style.opacity -= .02; if(elem.style.opacity < 0){ clearInterval(desvanecer); } }, speed / 50); } fadeOut(getElement, 500); Could somebody take a look at this and let me know what I'm doing wrong, all I want to do is "FADE IN" an element to an opacity equal to "1". By the way, I can't use jQuery, however I'm eager to learn this way. Thanks

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• Opinions on Unladen Swallow?

  - by vartec

  What are your opinions and expectations on Google's Unladen Swallow? From their project plan: We want to make Python faster, but we also want to make it easy for large, well-established applications to switch to Unladen Swallow. Produce a version of Python at least 5x faster than CPython. Python application performance should be stable. Maintain source-level compatibility with CPython applications. Maintain source-level compatibility with CPython extension modules. We do not want to maintain a Python implementation forever; we view our work as a branch, not a fork. And even sweeter: In addition, we intend to remove the GIL and fix the state of multithreading in Python. We believe this is possible through the implementation of a more sophisticated GC It almost looks too good to be true, like the best of PyPy and Stackless combined. More info: Jesse Noller: "Pycon: Unladen-Swallow" ArsTechnica: "Google searches for holy grail of Python performance" Update: as DNS pointed out, there was related question: http://stackoverflow.com/questions/695370/what-is-llvm-and-how-is-replacing-python-vm-with-llvm-increasing-speeds-5x

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• Worse is better. Is there an example?

  - by J.F. Sebastian

  Is there a widely-used algorithm that has time complexity worse than that of another known algorithm but it is a better choice in all practical situations (worse complexity but better otherwise)? An acceptable answer might be in a form: There are algorithms A and B that have O(N**2) and O(N) time complexity correspondingly, but B has such a big constant that it has no advantages over A for inputs less then a number of atoms in the Universe. Examples highlights from the answers: Simplex algorithm -- worst-case is exponential time -- vs. known polynomial-time algorithms for convex optimization problems. A naive median of medians algorithm -- worst-case O(N**2) vs. known O(N) algorithm. Backtracking regex engines -- worst-case exponential vs. O(N) Thompson NFA -based engines. All these examples exploit worst-case vs. average scenarios. Are there examples that do not rely on the difference between the worst case vs. average case scenario? Related: The Rise of ``Worse is Better''. (For the purpose of this question the "Worse is Better" phrase is used in a narrower (namely -- algorithmic time-complexity) sense than in the article) Python's Design Philosophy: The ABC group strived for perfection. For example, they used tree-based data structure algorithms that were proven to be optimal for asymptotically large collections (but were not so great for small collections). This example would be the answer if there were no computers capable of storing these large collections (in other words large is not large enough in this case). Coppersmith–Winograd algorithm for square matrix multiplication is a good example (it is the fastest (2008) but it is inferior to worse algorithms). Any others? From the wikipedia article: "It is not used in practice because it only provides an advantage for matrices so large that they cannot be processed by modern hardware (Robinson 2005)."

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