"break on objc_autoreleasenopool"
How can I do that?
I searched for it but could not find any steps.
Can anyone give a number of steps on what to do?
See the documentation on adding symbolic breakpoints.
Related
I know we can add breakpoints in the consequences of a rule, but how can we debug the when clause ? my rule is not verified i wanna know why.
Please help
Use DebugAgendaEventListener
Take a look at this blog post
I know that this question has been posted multiple times. And I have done my research but still was left clueless. So please bear with me but I wanted to see if someone can offer more direct help,
I am using the latest Python xy distribution
https://code.google.com/p/pythonxy/
I launched an ipython session and tried to write a simple fibonacci function, after doing load_ext cythonmagic. But ran into the above error. I also set the env. variable VS90COMNTOOLS to equal %VS100COMNTOOLS%, as some posts suggested. That did not fix it, what else can I do to fix the error?
Thanks
When I debug in eclipse the debug window show lots of files. If I hit F6 again and again but dont actually know what is happening.
What am I doing wrong? Can anyone help me find a good tutorial?
This should help:
http://www.ibm.com/developerworks/library/os-ecbug/
Hopefully this tutorial will help you: http://www.vogella.de/articles/EclipseDebugging/article.html - it's pretty straightforward.
Some more additional information on debugging using eclipse:
http://www.developer.com/java/other/article.php/2221711/Debugging-a-Java-Program-with-Eclipse.htm
My iphone app randomly received this message. I know certain it is memory release problem. However what is the best way to find which object leads this problem. Here are what I have tried
Use Instrument Leak and
ObjectAllocation Trace. Dont saw any
help to know which object have this
problem
Put NSZombieEnabled=YES and project executive ... Dont saw any
help either
Put NSLog everywhere but the EXE_BAD_ACCESS just appear anywhere.
in the debuger, just saw the code
happened in the assembly. like
objc-msg send.
review code many times and read memory management a lot time
and research online a lot time. but
no surprise.
Is there a completed solution to figure out this problem easily. I am a previous Visual C++ programmer, I deal with memory management with years and it is easy to debug and figure out in Visual C++.
If you couldn't see any helpful debug info, I would suggest you find all the places that you are doing a release. It is most likely the case that you have released something that did not need to be released. Code would help us in tracing the issue with you.
As Juan noted, the first stop is the Debugger - what does the debug window give for a stack trace when the app crashes? You should be able to see the line it crashed on... you said in a comment to one response that you saw the crash happen around the lines:
CGPDFDocumnetRef docA=CGPDFDocumentCreatWithURL(myurl);
CGPDFDocumnetRef docB=CGPDFDocumentCreatWithURL(myurl);
Are you really using the same URL object for both calls? Which line is it exactly?
It could be something around the way you make use of the CGPDFDocumentRef, you can find example code how Apple uses them in the QuartzDemo project, file "QuartzImageDrawing.m" (you can find the demo project from the developer portal or embedded in the iPhone documentation with XCode).
XCode is actually pretty powerful, but it does things differently from other IDE's.
In addition to Erich answer, I'd want to add go backward. Start with the most recently added release and work from there.
I ran in to this and it turned out I was releasing an auto-released object that was returned from a convenience method built in to the Cocoa-Touch framework. My problem was as Erich described -- I released this auto-released object. When the system attempted to release it, the program gave the error you are describing.
Regards,Frank
The best way to know what happend is using the xCode Debbuger, give it a try.
You will also receive the message when you don't pass enough parameters to a variable argument method. For example having a NSLog statement like this: NSLog(#"Hello %#");
To check what the error might be
Use NSZombieEnabled.
To activate the NSZombieEnabled facility in your application:
Choose Project > Edit Active Executable to open the executable Info window.
Click Arguments.
Click the add (+) button in the “Variables to be set in the environment” section.
Enter NSZombieEnabled in the Name column and YES in the Value column.
Make sure that the checkmark for the NSZombieEnabled entry is selected.
found this on iPhoneSDK
if set to on the NSZombie, it tells me that I'm releasing an object which is already released and gives me the memory address, very helpful... BUT I can't see which object it's... because the app stopped working...
any help?
thank you
You are looking for: malloc_history
http://www.friday.com/bbum/2010/01/10/using-malloc-to-debug-memory-misuse-in-cocoa/
malloc_history and my post on the same is certainly a correct answer and one way to do this.
However, it is quite likely you can do the same with Instruments, which is also going to be a bit less low level and more straightforward. Under Xcode's Run menu is Run With Performance Tool. Under that, you'll find Zombies.
Running with that, you should be able to see the type of the object being messaged and the retain/release event history.
Try Apple's http://developer.apple.com/library/mac/#documentation/DeveloperTools/Conceptual/InstrumentsUserGuide/Introduction/Introduction.html utility, found in /Developer/Applications/.
A commercial alternative is http://www.omnigroup.com/developer/omniobjectmeter/