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• Memory cleanup on returned array from static method (objective-c)

  - by Michael Bordelon

  In objective-c, I have a utility class with a bunch of static methods that I call for various tasks. As an example, I have one method that returns an NSArray that I allocate in the static method. If I set the NSArray to autorelease, then some time later, the NSArray in my calling method (that is assigned to the returned pointer) losses it's reference because the original form the static method is cleaned up. I can't release the NSArray object in the static method because it needs to be around for the return and assignment. What is the right way to return an object (like the NSArray) from a static class, and have it hang around for the calling class, but then get cleaned up later when it is no longer needed? Do I have to create the object first in the caller and pass in a pointer to the object and then return that same object form the static method? I know this is a basic O-O problem, I just never had this issue in Java and I do not do much C/C++. Thanks for your help.

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• Interface builder problem: When hooking up an IBOutlet, getting "this class is not key value coding-

  - by Robert

  Here is what I do: 1) Create New UIViewController subclass , tick with NIB for interface builder 2) In the header: @interface QuizMainViewController : UIViewController { UILabel* aLabel; } @property (nonatomic, retain) IBOutlet UILabel* aLabel; @end 3) In the .m #import "QuizMainViewController.h" @implementation QuizMainViewController @synthesize aLabel; - (void)dealloc { [aLabel release]; [super dealloc]; } @end 4) Open the NIB In interface builder, drag a new UILabel into the view. I test the program here and it runs fine. 5) right click on file's owner, connect 'aLabel' from the Outlets to the UILabel. I run here and it crashes. Message from log: * Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key aLabel.'

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• UIImagePickerController camera preview is portrait in landscape app

  - by Jane Sales

  In my landscape-only iPhone application, I launch a UIImagePickerController to take a photo, but the live image displayed from the camera is in portrait orientation, with blank space around it. The image is rotated. Once the camera button is pressed, the preview is very messy, with most of the preview off screen, and views not correctly aligned. Apple has acknowledged that this is defect, and is working on it. My question is, does anyone have a work-around (legal or illegal) that would allow me to get this working now. I wouldn't release to the App Store with an illegal fix, but I would have a much better app for user testing - currently the camera is pretty much unusable in landscape. I will attach a simple test project and images if I can. Edit - just to clarify, the image I get is correctly landscape. I want the camera & preview UIs to look right!

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• How to use NSString drawInRect to centre text?

  - by Steve Folly

  How can I draw a string centred within a rect? I've started off with: (an extract from the drawRect method of my custom view) NSString* theString = ... [theString drawInRect:theRect withAttributes:0]; [theString release]; Now I'm assuming I need to set up some attributes. I've had a look through Apple's Cocoa documentation, but it's a bit overwhelming and can't find anything for how to add paragraph styles to the attributes. Also, I can only find horizontal alignment, what about vertical alignment? Thanks.

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• Does Team Foundation Server supports Checkpoints?

  - by marco.ragogna

  My dev team used in the past MKS Source Integrity source control and we are not evaluating to migrate to TFS 2010. Some concepts and meaning are a bit different and we need sometime to learn how to do the same things we do before in TFS or how to change our approach. First of all, we used to do Checkpoints for each software release. MKS in this case does a snapshot of all source code files. You can later compare different checkpoints to see the code differences, or extract a whole checkpoint as a build. Does TFS have a similar feature? Do you know where can I read something about it? Thanks in advance, Marco

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• [UITableViewController loadView] loaded the "PersonnalDetails" nib but didn't get a UITableView.

  - by tak

  I am trying to load a new view with the following code - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { PersonnelDetails *detailViewController = [[PersonnelDetails alloc] initWithNibName:@"PersonnelDetails" bundle:[NSBundle mainBundle]]; [self.navigationController pushViewController:detailViewController animated:YES]; [detailViewController release]; } inhertance :- PersonnelDetails inherits UITableViewController but i am getting an exception : Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[UITableViewController loadView] loaded the "PersonnalDetails" nib but didn't get a UITableView.' even though i have a UITableView in the PersonnalDetails nib and also i have connected the view outlet of PersonnelDetails(viewController) to the UITableView. what can be the posible cause?

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• PerformSelectorInBackground leaking on device

  - by Oysio

  While it seems to not pose a problem on the simulator, using performSelectorInBackground on the device causes memory leaks. Or at least that's what Instruments indicates. Looking at the code I don't have a single clue what the cause could be. I tried to strip the affected code to a bare minimum but still strangely Instruments keeps showing a leak every time this piece of code is executed. Anything unusual going on here? //In viewcontrollerA: -(void)mainLoop { [self.viewControllerB performSelectorInBackground:@selector(calculateTotals) withObject:nil]; //This gives the same problem //[NSThread detachNewThreadSelector:@selector(calculateTotals) toTarget:self.viewControllerB withObject:nil]; //UI stuff ... } //viewControllerB: -(void)calculateTotals { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; //Heavy calculations ... [pool release]; }

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• Python thread pool similar to the multiprocessing Pool?

  - by Martin

  Is there a Pool class for worker threads, similar to the multiprocessing module's Pool class? I like for example the easy way to parallelize a map function def long_running_func(p): c_func_no_gil(p) p = multiprocessing.Pool(4) xs = p.map(long_running_func, range(100)) however I would like to do it without the overhead of creating new processes. I know about the GIL. However, in my usecase, the function will be an IO-bound C function for which the python wrapper will release the GIL before the actual function call. Do I have to write my own threading pool?

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• How does "Require SSL" affect ASP.NET MVC application lifecycle?

  - by Ragesh

  I have an application that taps into BeginRequest and EndRequest to set up and tear down NHibernate sessions like this: BeginRequest += delegate { CurrentSessionContext.Bind(SessionFactory.OpenSession()); }; EndRequest += delegate { var session = CurrentSessionContext.Unbind(SessionFactory); session.Dispose(); Container.Release(session); }; This works fine when deployed in IIS, until I check the "Require SSL" box. Once I do this, I get a NullReferenceException at session.Dispose(). I haven't debugged this yet and, yes, the fix is trivial, but I'm just curious about how "Require SSL" affects the lifecycle of a request. Is a session not set up on the server in these cases?

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• JS settimeout doesn’t work in IE8…

  - by Nagesh

  <html> <head> <script> var i; i = 0; function loop() { i = i + 1; alert(String(i)); setTimeout("loop()",1000); } setTimeout("loop()",1000); </script> </head> <body> </body> </html> Please try the above code in IE8 it will not give alert message for every 1 sec if you hold right click. But in firefox it will give alert message even though if you dont release the right click. I want the firefox functionality in IE8.

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• numeric updown control c#

  - by Raghav

  I am using numeric updowncontrol. For min and max values changed listening for these events this.numDownMinLimit.ValueChanged += new System.EventHandler(this.numDownMinLimit_ValueChanged); this.numDownMaxLimit.ValueChanged += new System.EventHandler(this.numDownMaxLimit_ValueChanged); step size set is 0.1 The eventhandler takes some time to complete. If you keep the mouse pressed for a period of time and then release it, the eventhandler still executes with the previous values which were fired. How do we prevent this scenario from occurring? I would like to discard the remaining events which are still in the queue, waiting to be handled, when the user releases the mouse button.

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• How do I change JAVASCRIPT_DEFAULT_SOURCES for my application?

  - by Adam Lassek

  When you call javascript_include_tag :defaults you usually get: prototype.js, effects.js, dragdrop.js, and controls.js. These are stored in a constant in ActionView::Helpers::AssetTagHelper called 'JAVASCRIPT_DEFAULT_SOURCES`. My application uses jQuery, so I want to replace the Prototype references with something more useful. I added an initializer with these lines, based on the source code from jRails: ActionView::Helpers::AssetTagHelper::JAVASCRIPT_DEFAULT_SOURCES = %w{ jquery-1.4.min jquery-ui jquery.cookie } ActionView::Helpers::AssetTagHelper::reset_javascript_include_default But when I do this, I get: warning: already initialized constant JAVASCRIPT_DEFAULT_SOURCES during startup. What's the correct way of changing this value? In the source code it checks for the constant before setting it, but apparently that happens before it runs the initializer scripts. The Rails 3.0 release will provide much greater flexibility with choice of JS libraries, so I guess this is a problem with an expiration date.

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• StyleCop 4.4 works inside VS.NET 2010 but not MSBuild command line

  - by Steve Michelotti

  We are seeing extremely strange results where StyleCop will correctly report violations when run from within Visual Studio 2010. However, when we run msbuild on the command line (e.g., "MSBuild.exe mySolution.sln") it reports "No violations encountered" when clearly there are the same violations as when we ran it within Visual Studio. Is this a bug in the latest release of StyleCop? Or in the 2010 integration? Is there anything you can tell me about possible differences with StyleCop executing from within VS.NET versus MSBuild command line? Thanks.

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• Iphone SDK array initlised at viewdidload and released at dealloc is causing leak?

  - by Skeep

  Hi All, I am new to iphone development and i am getting ready to submit my first app. I have an array initlised at viewdidload and released at dealloc, however it is causing a leak. My question is why would this happen is it because the dealloc has not run? My Code is as follows the NSMutableArray called listOfItems is referenced in my .h file for the UITableView. The listOfItems array is used to populate the table. In the viewDidLoad method i have this code listOfItems = [[NSMutableArray alloc] init]; and in the dealloc i have: [listOfItems release]; When watching leaks in instruments I get a NSArray leak which when I drill down points to the line: listOfItems = [[NSMutableArray alloc] init]; Am i putting all this in the right place? Thanks

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• Installing bitarray in Python 2.6 on Windows

  - by John Fouhy

  I would like to install bitarray in Windows running python 2.6. I have mingw32 installed, and I have C:\Python26\Lib\distutils\distutils.cfg set to: [build] compiler = mingw32 If I type, in a cmd.exe window: C:\Documents and Settings\john\My Documents\bitarray-0.3.5>python setup.py install I get: [normal python messages skipped] C:\MinGW\bin\gcc.exe -mno-cygwin -mdll -O -Wall -IC:\Python26\include -IC:\Python26\PC -c bitarray/_bitarray.c -o build\temp.win32-2.6\Release\bitarray\_bitarray.o bitarray/_bitarray.c:2197: error: initializer element is not constant bitarray/_bitarray.c:2197: error: (near initialization for `BitarrayIter_Type.tp_getattro') bitarray/_bitarray.c:2206: error: initializer element is not constant bitarray/_bitarray.c:2206: error: (near initialization for `BitarrayIter_Type.tp_iter') bitarray/_bitarray.c:2232: error: initializer element is not constant bitarray/_bitarray.c:2232: error: (near initialization for `Bitarraytype.tp_getattro') bitarray/_bitarray.c:2253: error: initializer element is not constant bitarray/_bitarray.c:2253: error: (near initialization for `Bitarraytype.tp_alloc') bitarray/_bitarray.c:2255: error: initializer element is not constant bitarray/_bitarray.c:2255: error: (near initialization for `Bitarraytype.tp_free') error: command 'gcc' failed with exit status 1 Can anyone help?

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• How do I make my NSNotification trigger a selector?

  - by marty

  Here's the code: - (void)viewDidLoad { [super viewDidLoad]; NSURL *musicURL = [NSURL URLWithString:@"http://live-three2.dmd2.ch/buureradio/buureradio.m3u"]; if([musicURL scheme]) { MPMoviePlayerController *mp = [[MPMoviePlayerController alloc] initWithContentURL:musicURL]; if (mp) { // save the music player object self.musicPlayer = mp; [mp release]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(popBack:) name:@"MPMoviePlayerDidExitFullscreenNotification" object:nil]; // Play the music! [self.musicPlayer play]; } } } -(void)popBack:(NSNotification *)note { [self.navigationController popToRootViewControllerAnimated:YES]; } The selector method never gets called. I just want to pop back to the root menu when the "Done" button is pressed on the movie player. I put an NSLog in the selector to check if it was even being called, nothing. The music plays fine. Any thoughts?

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• Is there a Java equivalent to libevent?

  - by JoelPM

  I've written a high-throughput server that handles each request in its own thread. For requests coming in it is occasionally necessary to do RPCs to one or more back-ends. These back-end RPCs are handled by a separate queue and thread-pool, which provides some bounding on the number of threads created and the maximum number of connections to the back-end (it does some caching to reuse clients and save the overhead of constantly creating connections). Having done all this, though, I'm beginning to think an event-based architecture would be more efficient. In searching around I haven't found any equivalents to libevent for Java, but maybe I'm not looking in the right place? Mina-statemachine from Apache was the closest thing I found, but it looks more verbose than I need and there's no real release available. Any suggestions?

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• NAnt authorization access issue

  - by Luís Custódio

  I'm having a problem trying to move a file through my network, I want to transfer the release from my continuos integration virtual machine to the host of this VM. but i get this: System.UnauthorizedAccessException: Access to the path '\\192.168.0.36\E$\WebApps\MyProgram' is denied. at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.Directory.InternalCreateDirectory(String fullPath, String path, DirectorySecurity dirSecurity) at System.IO.Directory.CreateDirectory(String path, DirectorySecurity directorySecurity) at NAnt.Core.Tasks.MoveTask.DoFileOperations() at NAnt.Core.Tasks.CopyTask.ExecuteTask() at NAnt.Core.Task.Execute() at NAnt.Core.Target.Execute() at NAnt.Core.Project.Execute(String targetName, Boolean forceDependencies) at NAnt.Core.Project.Execute() at NAnt.Core.Project.Run() I'm trying to transfer from a Windows Server 2003 R2 to a Windows Server 2008 R2.

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• Cannot change the target CPU to x86 Or x64 in Visual Studio 2005

  - by geekzilla

  I am trying to build a website application and specify the target CPU as x86 instead of Any CPU. The only choices I have in Configuration Manager under the "Active solution platform:" drop-down list are: "Any CPU", "Edit..", and "New...". In the "Project Contexts" portion of the "Configuration Manager" window, it lists 3 columns: "Project", "Configuration" and "Platform". Under the "Platform" column, my only choice is ".Net". when the "Active solution configuration" is set to, "Debug". When the, ""Active solution configuration" is set to "Release", then I can choose either, ".Net" or "Any CPU" under the "Platform" column. I am using Visual Studio 2005 Professional Edition. This website was previously built using Visual Studio .NET and was recently upgraded using the Visual Studio 2005 Professional Edition Upgrade Wizard. I need to target x86 specifically because the are components used in the project that are only x86 compatible.

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• tableview - unrecognized selector sent to instance

  - by ct2k7

  Hi, I'v just got this error in my app. 2010-04-06 03:58:55.463 EasyPay DPS[6530:207] WARNING: Using legacy cell layout due to delegate implementation of tableView:accessoryTypeForRowWithIndexPath: in <NTItems: 0x397af90>. Please remove your implementation of this method and set the cell properties accessoryType and/or editingAccessoryType to move to the new cell layout behavior. This method will no longer be called in a future release. 2010-04-06 03:58:55.505 EasyPay DPS[6530:207] *** -[NTItems tableView]: unrecognized selector sent to instance 0x397af90 2010-04-06 03:58:55.515 EasyPay DPS[6530:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NTItems tableView]: unrecognized selector sent to instance 0x397af90' This error is extremely unuseful - where do I start in my code?

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• How to free member (i.e BSTR, SAFEARRAY, VARIANT) of an IDL User Defined Structure which is encapsul

  - by Picaro De Vosio

  Hi, I have a structure defined in IDL. This structure has following members: { BSTR m_sFirst; BSTR m_sSecond; VARIANT m_vChildStruct; //This member encapsulate a sub structure SAFEARRAY __RPC_FAR * m_saArray; }CustomINFO; I am allocating the memory for the structs using CoTaskMemAlloc and encapsulating it in Variant as follows: vV-vt = VT_RECORD; vV-pvRecord = pStruct; //Pointer of sturct vV-pRecInfo = pRI; //RecordInfo Interface Is it enough to call VariantClear to deallocate the memory of struct and its members? Will it also release the IRecordInfo interface? Or i have to manually get the encapsulated struct and deallocate each member myself and then use CoTaskMemFree to deallocate sturct. Thanks Picaro De Vosio

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• A better way of switching between Android source versions

  - by dan

  I would like to be able to switch between various android releases (1.0, 1.5, 2.0, etc.) and then access them via the file system to copy all files for that version into a tarball. Currently I am just running repo init -u <source URL> -b release-1. to get each version (changing the tag for each version I need). If this was a single git, I could check out the branch/tag I needed and the prject directory would "morph" to reflect then and I could just tar that folder. since the android source is split into multiple git repositories controlled by repo I have not yet found a way to change this other then the method mentioned above. any suggestions are appreciated.

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• How do I Call a method from other Class

  - by balexandre

  Hi guys, I'm having some trouble figuring out to call methods that I have in other classes #import "myNewClass.h" #import "MainViewController.h" @implementation MainViewController @synthesize txtUsername; @synthesize txtPassword; @synthesize lblUserMessage; - (IBAction)calculateSecret { NSString *usec = [self calculateSecretForUser:txtUsername.text withPassword:txtPassword.text]; [lblUserMessage setText:usec]; [usec release]; } ... myNewClass.h #import <Foundation/Foundation.h> @interface myNewClass : NSObject { } - (NSString*)CalculateSecretForUser:(NSString *)user withPassword:(NSString *)pwd; @end myNewClass.m #import "myNewClass.h" @implementation myNewClass - (NSString*)CalculateSecretForUser:(NSString *)user withPassword:(NSString *)pwd { NSString *a = [[NSString alloc] initWithFormat:@"%@ -> %@", user, pwd]; return a; } @end the method CalculateSecretForUser always says 'MainViewController' may not respond to '-calculateSecretForUser:withPassword:' what am I doing wrong here?

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• Revision histories and documenting changes

  - by jasonline

  I work on legacy systems and I used to see revision history of files or functions being modified every release in the source code, for example: // // Rev. No Date Author Description // ------------------------------------------------------- // 1.0 2009/12/01 johnc <Some description> // 1.1 2009/12/24 daveb <Some description> // ------------------------------------------------------- void Logger::initialize() { // a = b; // Old code, just commented and not deleted a = b + c; // New code } I'm just wondering if this way of documenting history is still being practiced by many today? If yes, how do you apply modifications on the source code - do you comment it or delete it completely? If not, what's the best way to document these revisions? If you use version control systems, does it follow that your source files contain pure source codes, except for comments when necessary (no revision history for each function, etc.)?

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• How do I find out what objects points to another object i Xcode Instruments

  - by Arlaharen

  I am trying to analyze some code of mine, looking for memory leaks. My problem is that some of my objects are leaking (at least as far as I can see), but the Leaks tool doesn't detect the leaks. My guess is that some iPhone OS object still holds pointers to my leaked objects. The objects I am talking about are subclasses of UIViewController that I use like this: MyController *controller = [[MyController alloc] initWithNibName:@"MyController" bundle:nil]; [self.navigationController pushViewController:controller animated:YES]; When these objects are no longer needed I do: [self.navigationController popViewControllerAnimated:YES]; Without a [controller release] call right now. Now when I look at what objects that gets created I see a lot of MyController instances that never gets destroyed. To me these are memory leaks, but to the Leaks tool they are not. Can someone here tell me if there is some way Instruments can tell me what objects are pointing to my MyController instances and thereby making them not count as memory leaks?

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