video recorder on iphone [closed]

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This is the program that i make. But i doesn't run good. when i open this program on iphone it immediatly turn off. I will show my code and answer me what is the problem.

UIImagePickerController * videoRecorder = [[[UIImagePickerController alloc] init] autorelease];
    videoRecorder.delegate = self;
    videoRecorder.sourceType = UIImagePickerControllerSourceTypeCamera;
    NSArray *sourceTypes = [UIImagePickerController availableMediaTypesForSourceType:videoRecorder.sourceType];
    if (![sourceTypes containsObject:(NSString*)kUTTypeMovie] ) {
        UIAlertView *alert = [[UIAler开发者_运维问答tView alloc] initWithTitle:nil 
                                                        message:@"Device Not Supported for video Recording."     
                                              cancelButtonTitle:@"Yes"
                                              otherButtonTitles:@"No",nil];
        [alert show];
        [alert release];
        return;
    }
    videoRecorder.sourceType = UIImagePickerControllerSourceTypeCamera;
    videoRecorder.mediaTypes = [NSArray arrayWithObject:(NSString*)kUTTypeMovie];           
    videoRecorder.videoQuality = UIImagePickerControllerQualityTypeLow;
    videoRecorder.videoMaximumDuration = 120;
    videoRecorder.delegate = self;
    self.recorder_ = videoRecorder;                 
    [videoRecorder release];
    [self presentModalViewController:self.recorder_ animated:YES]; 

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First: Use the code formatter in the future please. This hurts to look at.

Second: You're double releasing UIImagePicketController (videoRecorder) auto-release will release it after the current runloop exits, but you're also explicitly releasing it near the end of your method call here, so when iOS cleans up the auto-release pool, it will get a double release and crash.

I can't read the rest of this well due to the formatting, but that seems like your most likely bet for what's causing the crash.

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You should edit your post and make the code readable.

The problem is that you autorelease videoRecorder in the first line so you don't have to call the -release. videoRecorder has a retain count of zero in the first line and a retain count of one when you assign it to self.recorder_. When you call the release, then retain count goes to zero and the autorelease pool makes the object go away before the recorder can be presented as a modal view controller. Remove that -release call and you should be fine. Also, your code sets the delegate and sourceType two times.