Application crashes after sometime using UIGetScreenImage()

Question

Hi,
I've the following code to take the screenshots in iPhone:-
*+ (UIImage )imageWithScreenContents
* CGImageRef cgScreen = UIGetScreenImage();*
* if (cgScreen) {*
*UIImage *result = [UIImage imageWithCGImage:cgScreen];*
* CGImageRelease(cgScreen);*
*return result;*
*return nil;*
I'm calling the above code in a timer of 1/1.0 seconds as:
*[array addObject:[UIImage imageWithScreenContents]];*
where imagewithScreenContents is a function. But after some seconds i.e after adding 90 frames application crashes. I'm unable to understand the problem.
Can somebody help me in solving the problem ?
Thanks in Advance.

Answer 1

Hi,
first please use the structure(without the minus sign in the parenthesis) below in order to
properly post code:
{-code}
Place code here!
{-code}
Second, I am no iPhone developer but still I think you need to be more careful what and when you
are releasing(especially with a timer). I myself have an application that uses multiple timers, so may
be this will be helpful(without seeng your actual error message can't tell for sure). My first clue would be to ask you how you create your array object and what do you do with it. The second one,
I am not sure if this is needed but can't you define a property called 'screenShotImage' or so and
give it value in your 'imageWithScreenContents' function? What I am trying to say is:
-(UIImage*) screenShotImage
return screenShotImage;
-(void) setScreenShotImage: (UIImage*) input
[screenShotImage release];
screenShotImage = [input retain];
and then in your imageWithScreenContents method:
[self setScreenShotImage: [UIImage imageWithCGImage: cgScreen]];
CGImageRelease(cgScreen);
I am pretty sure that you are not handling your memory allocation/deallocation properly, do a
little research on the topic, I am also pretty sure that you have to be extra careful with memory
when implementing an iPhone app. Hope some of this helps.
Regards,
-artOf...