添加到 NSOperationQueue 时 exc_bad_access
我已经对 NSOperation 进行了子类化，并且 - (void) main 没问题，（因为它在使用 NSOperation 之前就可以工作），我还单步执行了 init 方法，并且变量已正确初始化。 在 -(id) initWithSampleBuffer: 完成后一切都很艰难，我试图将 uploadOperation 添加到 NSOperationQueue:
UploadOperation *ulOp = [[UploadOperation alloc] initWithSampleBuffer:sampleBuffer];
[queue addOperation:ulOp]; //here i get exc_bad_access
[ulOp release];
我得到 exc_bad_access。我尝试过断点，可以看到队列存在，ulOp 也是如此。 我无法弄清楚我做错了什么，因为据我了解，当您尝试将“消息”传递给已释放的内容时，就会发生 exc_bad_access ，显然，它们都不是。
- (id)initWithSampleBuffer:(CMSampleBufferRef) aSampleBuffer {
sampleBuffer = aSampleBuffer;
VideoStreamViewController *vc = [VideoStreamViewController shared];
ul = [[Uploader alloc] initWithURL:[NSURL alloc] filePath:@"" delegate:vc doneSelector:@selector(didFinishUpload:) errorSelector:@selector(uploadFailed:)];
return self;
}
然而，上传器的东西不是问题（我已经删除了它，但仍然得到相同的结果）。据我所知，CMSampleBuffer 对象没有问题，它已初始化！
队列初始化：
在 .h 中：
NSOperationQueue *queue;
@property (nonatomic, retain) NSOperationQueue *queue;
在 .m 中：
@synthesize queue;
self.queue = [[NSOperationQueue alloc] init];
[queue setMaxConcurrentOperationCount:1];
I've subclassed NSOperation and - (void) main is ok, (since it worked before using NSOperation), I've also stepped through the init method and the variables are initialized correctly.
All tough after the -(id) initWithSampleBuffer: is done and I'm trying to add the uploadOperation to the NSOperationQueue:
UploadOperation *ulOp = [[UploadOperation alloc] initWithSampleBuffer:sampleBuffer];
[queue addOperation:ulOp]; //here i get exc_bad_access
[ulOp release];
I get exc_bad_access. I've tried breakpoints and I can see that queue exists and so do ulOp.
I can't figure out what I'm doing wrong, since to my understanding exc_bad_access occurs when you're trying to pass a "message" to something that is already deallocated, and clearly, none of them are.
- (id)initWithSampleBuffer:(CMSampleBufferRef) aSampleBuffer {
sampleBuffer = aSampleBuffer;
VideoStreamViewController *vc = [VideoStreamViewController shared];
ul = [[Uploader alloc] initWithURL:[NSURL alloc] filePath:@"" delegate:vc doneSelector:@selector(didFinishUpload:) errorSelector:@selector(uploadFailed:)];
return self;
}
however the Uploader stuff, isn't the problem (i've removed it and still get the same result). and from what i can se there no problem with the CMSampleBuffer object, it is initialized!
init of queue:
in .h:
NSOperationQueue *queue;
@property (nonatomic, retain) NSOperationQueue *queue;
in .m:
@synthesize queue;
self.queue = [[NSOperationQueue alloc] init];
[queue setMaxConcurrentOperationCount:1];
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评论（1）
您没有在构造函数中调用
[super init]吗？假设您正在子类化 NSOperation （或 NSObject 等...），您可能应该这样做！
You're not calling
[super init]inside your constructor?Assuming you're subclassing NSOperation (or NSObject etc...), you probably should!