ios - 如何解决错误 : NSURLConnectionInternalConnection _withConnectionDisconnectFromConnection

Question

在我的应用程序中，我正在将一个巨大的 (200MB+) 文件下载到磁盘。
下载完成后出现此错误:

[NSURLConnectionInternalConnection _withConnectionDisconnectFromConnection]:  
message sent to deallocated instance 0x8cb0b40  

我尝试调用 info malloc-history 0x8cb0b40 但我得到了

Undefined info command: "malloc-history 0x8cb0b40".  Try "help info".  

我正在使用 (gdb) 但仍会收到此信息。我在这里找不到错误。

---

我该如何解决这个问题？

所以这是我的代码(NSURL 方法):

#pragma mark - NSURL methods


- (void)loadingProgress:(NSNumber *)nProgress {
[self.progressView setProgress:[nProgress floatValue]];
}


- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
XLog(@"");

[self.receivedData setLength:0];
XLog(@"response: %@", [response description]);


self.path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"vox.zip"];
[[NSFileManager defaultManager] createFileAtPath:self.path contents:nil attributes:nil];
self.file = [[NSFileHandle fileHandleForUpdatingAtPath:self.path] retain];// Here file is object of NSFileHandle and its declare in .h File

[self.file seekToEndOfFile];


if ([response isKindOfClass:[NSHTTPURLResponse self]]) {
    NSDictionary *headers = [(NSHTTPURLResponse *)response allHeaderFields];
    lengthOfXMLContent = [[headers objectForKey:@"Content-Length"] intValue];
    XLog(@"session: %@", [headers objectForKey:@"Set-Cookie"]);
    
    [self.prefs setValue:[headers objectForKey:@"Set-Cookie"] forKey:@"keySession"];
    
    XLog(@"headers: %@", headers);
    XLog(@"Incoming length: %i", lengthOfXMLContent);
    
}
}


- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {

//XLog(@"didReceiveData entered");

self.dataCount = self.dataCount + [data length];

if (self.receivedData) {
    
    self.paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    self.documentsDirectory = [self.paths objectAtIndex:0];
    
            
    self.responseString = [[[NSString alloc] initWithData:self.receivedData encoding:NSUTF8StringEncoding] autorelease];

}

XLog(@"------------------------------------------: %d", lengthOfXMLContent);


double progress = (double)self.dataCount / (double)lengthOfXMLContent;


XLog(@"--------------: %i", self.dataCount);
XLog(@"--------------: %d", lengthOfXMLContent);
XLog(@"--------------: ");
XLog(@"--------------: %f \n", progress);


[self.file seekToEndOfFile];
[self.file writeData:data];
//XLog(@"data--------------: %i", [data length]);

[self performSelectorInBackground:@selector(loadingProgress:) withObject:[NSNumber numberWithFloat:progress]];
}


- (void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
XLog(@"");
XLog(@"error: %@", error);


self.receivedData = nil;
self.progressView.progress = 0.00;
lengthOfXMLContent = 0;
//recievedData = NO;

UIAlertView *alertCanceled = [[UIAlertView alloc] initWithTitle:@"Verbindungsfehler" message:@"Verbindung wurde unterbrochen. \nPruefen Sie Ihre Verbindung und versuchen Sie es noch einmal." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alertCanceled show];
[alertCanceled release];

viewDownload.hidden = YES;

//[self removeActivityViewer];
[connection release];
[self.file closeFile];
}


- (void) connectionDidFinishLoading:(NSURLConnection *)connection {
XLog(@"");


[self.file closeFile];
//NSError *error = nil;
XLog(@"Succeeded! Received %d bytes of data", [self.receivedData length]);


[connection release];

//self.lblInfo.text = @"Datei wurde heruntergeladen.\nDatei wird entpackt, bitte Warten..";
self.progressView.hidden = YES;
self.btnDownloadVOX_DE.hidden = YES;
self.btnDownloadVOX_EN.hidden = YES;


[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;




ZipArchive *za = [[[ZipArchive alloc] init] autorelease];
[za UnzipOpenFile:[NSString stringWithFormat:@"%@/vox.zip", self.documentsDirectory]];
[za UnzipFileTo:self.documentsDirectory overWrite:YES];


viewDownload.hidden = YES;

}  

Answer 1

在您的 connectionDidFinishLoading 中，您释放连接，同时它仍在为您的委托(delegate)服务。

我假设您有一个属性或 ivar 将其保留在您的类中(我们称之为“myConnection”)。你应该在那个 didFinishLoading 委托(delegate)中做的是:

connection.delegate = nil; // insure no more delegate calls

其次是:

// either this
[self performSelectorOnMainThread:@selectior(setMyConnection:) withObject:nil waitUntilDone:NO];

// or using GCD (my preference)
dispatch_asynch(dispatch_get_main_queue(), ^ { myConnection = nil; } );

我敢打赌这会阻止崩溃。 [我在定位服务方面遇到了类似的问题!]