我有一个循环，得到一堆文件（10个小txt文件，并围绕700KB 1个大的图像文件），并运行“的GetFile”这对于每一个创建一个NSURLConnection的的网址。
当应用程序获取到[文件seekToEndOfFile]之前[文件写数据：数据]崩溃与：
*** Terminating app due to uncaught exception 'NSFileHandleOperationException', reason: '*** -[NSConcreteFileHandle seekToEndOfFile]: No such process'
*** First throw call stack:
奇怪的是，如果我通过代码（即慢慢地使每个连接去，回来），然后将所有文件都下载罚款。 如果我只是让应用程序做它的事它崩溃。
下面是连接的代码：
-(void)getFile {
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:fullURL]];
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
[conn start];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
NSString *fileName = [[response URL] lastPathComponent];
NSString *filePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]stringByAppendingPathComponent:fileName];
[[NSFileManager defaultManager] createFileAtPath:filePath contents:nil attributes:nil];
file = [NSFileHandle fileHandleForUpdatingAtPath:filePath];
[file seekToEndOfFile];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[file seekToEndOfFile]; // crashing here
[file writeData:data];
}
- (NSCachedURLResponse *)connection:(NSURLConnection *)connection
willCacheResponse:(NSCachedURLResponse*)cachedResponse {
return nil;
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSLog(@"Connection is %@", connection);
[file closeFile];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSLog(@"error - %@", error);
}
难道我的应用程序有问题保持参照传出连接？ 我曾以为，NSURLConnections，默认情况下，是异步的，你不会需要他们来“跟踪”？
编辑我已经子类NSURLConnection的和如下实例：
-(void)getFile {
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:fullURL]];
FileURLConnection *conn = [[FileURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES ];
conn.fileName = [fullURL lastPathComponent];
[conn start];
}
