How to add NSDebug.h and use NSZombie in iPhone SDK
I want to enable NSZombies for my iPhone app.
I have read several articles online and I am still unsure of the exact procedure.
I know I have to set the Environment Variables, which I have done:
NSZombieEnabled = YES NSDebugEnabled = YES NSDeallocateZombies = NO
I think (I'm not sure), I have to import NSDebug.h. When I check the headers of the Foundation Framework in my project, there is no NSDebug.h.
After some research, I found them in the iPhoneSimulator Foundation Framework. So (and I'm not sure if this is correct), I imported the iPhoneSimualtor Foundation Framework into my project. I noticed that the file STILL does not show up in the project window, even though I can locate it in the Finder.(Is this normal behavior?).
So I opened up main and added:
#ifdef TARGET_IPHONE_SIMULATOR #import <Foundation/NSDebug.h> #endif
I am not sure if that is right either. After this I still can't get the NSZombie to work (unless I have misunderstood what it is supposed to do) I am expecting to see a log of " NSZombie sent a release... " or something. But I don't see anything
I'm sure I'm just not doing this right, a good step by step would be appreciated. Thanks
Also of note, I have also enabled:
NSMallocStacklLogging = YES MallocStackLoggingNoCompact = YES
You don't have to include NSDebug.h or import any special frameworks to use NSZombies. Basically, turn 'em on in your environment variables, and then, if you attempt to message a dealloc'd object, THEN you'll see something in your console, along the lines of:
2009-02-10 21:17:08.546 MyApp[16926:20b] *** -[CFString _cfTypeID]: message sent to deallocated instance 0x4babc0
Are you setting the environment variable correctly? The step by step guide is
- Double-click an executable in the Executables group of your Xcode project.
- Click the Arguments tab.
- In the "Variables to be set in the environment:" section, make a variable called "NSZombieEnabled" and set its value to "YES".
You don't need to #import NSDebug.h
-1 to Apple. Debug builds should be running with full instrumentation out of the box (with a choice to opt-out). Also see http://www.cocoadev.com/index.pl?NSZombieEnabled for additional itms of interest to someone who is developing and debugging a program.