NSMutableData导致内存泄漏

Question

我有一个用于连接httprequests的类.我正在获取"NSMutableData"的内存泄漏,我将在"didFailWithError"和连接对象的"connectionDidFinishLoading"中释放它:

- (BOOL)startRequestForURL:(NSURL*)url {

[url retain];


NSMutableURLRequest* urlRequest = [[NSMutableURLRequest alloc] initWithURL:url];
// cache & policy stuff here
[[NSURLCache sharedURLCache] removeAllCachedResponses];
[urlRequest setHTTPMethod:@"POST"];
[urlRequest setHTTPShouldHandleCookies:YES];
NSURLConnection* connectionResponse = [[[NSURLConnection alloc] initWithRequest:urlRequest delegate:self] autorelease];
if (!connectionResponse)
{
    // handle error
    return NO;
} else {
    receivedData = [[NSMutableData data] retain]; // memory leak here!!!
}

[url release];

[urlRequest release];


return YES;}

- (void)connection:(NSURLConnection*)connection didFailWithError:(NSError*)error {
UIAlertView *alert =
[[[UIAlertView alloc]
  initWithTitle:NSLocalizedString(@"Connection problem", nil)
  message:NSLocalizedString(@"A connection problem detected. Please check your internet connection and try again.",nil)

  delegate:self
  cancelButtonTitle:NSLocalizedString(@"OK", nil)
  otherButtonTitles:nil, nil]
 autorelease];
[alert show];

[connectionDelegate performSelector:failedAction withObject:error];
[receivedData release];}

- (void)connectionDidFinishLoading:(NSURLConnection*)connection {
[connectionDelegate performSelector:succeededAction withObject:receivedData];
[receivedData release];}

Answer 1

静态分析器会将此称为泄漏,因为您无法保证release实际调用具有某个特征的方法.

如果设置receivedData为保留属性,则执行此操作

self.receivedData = [NSMutableData data];

然后在你的dealloc(以及你的didFail和didFinish,而不是发布):

self.receivedData = nil;

你会没事的.

正如jbat100指出的那样,如果是!connectionResponse,你也会泄漏url和urlRequest,除非你从问题中省略了这段代码