NSThread中的NSUrlConnection - 没有执行委托！

我在NSThread中使用NSURLConnection，但没有执行NSURLConnection的委托方法！我在我的NSTread子类中有一个主要方法，并有一个可以使线程保持活动状态的while循环。任何帮助？NSThread中的NSUrlConnection - 没有执行委托！

对不起，我认为这是描述我的问题的最好方法。因此，这是确实大多来自苹果的示例项目的异步连接，因此调用createConnectionWithPath:userObjectReference

@interface WSDAsyncURLConnection : NSObject 
{ 
    NSMutableData *receivedData; 
    NSDate *connectionTime; 
    NSURLConnection *connection; 

    id _theUserObject; 

} 


@property (nonatomic, retain) NSMutableData *receivedData; 
@property (nonatomic, retain) NSDate *connectionTime; 
@property (nonatomic, assign) NSURLConnection *connection; 

- (void)createConnectionWithPath:(NSString *)thePath userObjectReference:(id)userObject; 


@end 


#import "WSDAsyncURLConnection.h" 

@implementation WSDAsyncURLConnection 
@synthesize connectionTime, receivedData, connection; 


- (void) terminate 
{ 
    if (self.connection) { 
     [self.connection release]; 
     self.connection = nil; 
    } 
} 


- (void) createConnectionWithPath:(NSString *)thePath userObjectReference:(id)userObject; 
{ 
    _theUserObject = userObject; 


    NSURLRequest *theRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:thePath] 
               cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData timeoutInterval:60]; 


    self.connection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self startImmediately:YES]; 

    if (self.connection) 
    { 
     /* record the start time of the connection */ 
     self.connectionTime = [NSDate date]; 

     /* create an object to hold the received data */ 
     self.receivedData = [NSMutableData data]; 
    } 
} 


- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response 
{ 
    [self.receivedData setLength:0]; 
} 

- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data 
{ 
    /* appends the new data to the received data */ 
    [self.receivedData appendData:data]; 
} 

- (void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error 
{  
    [self terminate]; 
} 


- (void) connectionDidFinishLoading:(NSURLConnection *)connection 
{ 
    // displays the elapsed time in milliseconds 
    NSTimeInterval elapsedTime = [[NSDate date] timeIntervalSinceDate:self.connectionTime]; 
    // displayes the length of data received 
    NSUInteger length = [self.receivedData length]; 

    NSString* aStr = [[NSString alloc] initWithData:receivedData encoding:NSASCIIStringEncoding]; 

    [self terminate]; 


    [[NSNotificationCenter defaultCenter] postNotificationName:WSDAsynchURLConnectionDidFinished 
                 object:_theUserObject 
                 userInfo:[NSDictionary dictionaryWithObject:aStr forKey:@"urlResponseString"]]; 

    NSLog(@"ti=%f, l=%d, response=%@", elapsedTime, length, aStr); 

} 

@end

此代码是一个对象，它的NSThread外面工作正常。但是，当我在下面的线程子类中使用它时，没有委托方法被执行！

@implementation IncomingThread 



- (void) main { 

    NSAutoreleasePool *poool = [[NSAutoreleasePool alloc] init]; 


// I start the URLConnection here ... But no delegate is executed ! 
     [urlConn createConnectionWithPath:@"http://localhost:8888" userObjectReference:nil]; 


    while (![self isCancelled]) { 

     [NSThread sleepForTimeInterval:3.]; 
    } 


    [poool release]; 

} 


- (id) init 
{ 
    self = [super init]; 
    if (self != nil) { 

     urlConn = [[WSDAsyncURLConnection alloc] init]; 
    } 
    return self; 
} 


- (void) dealloc { 

    NSLog(@"deallocating (%@)...", [self className]); 


    [urlConn release]; 

    [super dealloc]; 
}

来源

2011-02-22 Vassilis

首先：你不需要在单独的线程中使用NSURLConnection。由于它是异步的，它不会阻塞主线程。二：没有你的连接的处理，因为你总是用这种和平的代码停止线程的runloop的执行：

while (![self isCancelled]) { 
     [NSThread sleepForTimeInterval:3.]; 
    }

从文档的sleepForTimeInterval：

No run loop processing occurs while the thread is blocked.

来源

2011-02-22 18:38:02 Max

你是对的！我错过了！谢谢！ – Vassilis 2011-02-22 18:44:23

xmmm ...即使我评论`sleepForTimeInterval`仍然没有代表呼叫发生。（我不释放线程 - 除非在main方法完成时它自己释放，但不是！） – Vassilis 2011-02-22 18:53:52

当然，是的，这会导致线程立即退出。如果你想使用单独的线程，则使用同步请求或在主线程中执行异步请求。 – Max 2011-02-22 18:55:35

你这样做是艰难的。 NSURLConnection对线程来说不是很好，因为它需要一个运行循环才能工作。你的线程没有运行循环，因此代码不起作用。为什么不在主线程上运行连接？或者您可以将连接包装在NSOperation，sample code here中。现在，您也可以选择使用同步连接并将其分派到全球GCD队列。

来源

2011-02-22 18:37:56 zoul

非常感谢您！我会看看示例代码NSOperation – Vassilis 2011-02-22 18:47:26

你还记得分配代表？

喜欢的东西：

self.connection.delegate = self;

仅仅因为你的WSDAsyncURLConnection类实现的委托方法，但这并不意味着他们是被调用。

来源

2011-02-22 18:55:00 Friesgaard

晚，但它可以挽救他人的生命:)

解决方案链接：NSURLConnection的delege方法都不起作用

来源

2011-05-18 11:00:31

NSThread中的NSUrlConnection - 没有执行委托！

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