如何恢复ASINetworkQueue？

Question

我试图做它恢复和排队从网络连接丢失时的位置相同的点。我的问题不在于可达性，而在于恢复下载。我花了整个周末，但没有运气。
非常感谢您的帮助。

下面的代码有方法commenceDownloadIfReachabilityIsOkay当网络恢复但进度条不移动时，它会被调用，但我没有看到任何活动来判断下载是否恢复。

调用此方法frin IBAction为在控制器

- (void) downloadFile:(UIProgressView*)locprogressView; 
    { 

    // check for internet connection 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkNetworkStatus:) name:kReachabilityChangedNotification object:nil]; 

    internetReachable = [[Reachability reachabilityForInternetConnection] retain]; 
    [internetReachable startNotifier]; 

    // check if a pathway to a random host exists 
    hostReachable = [[Reachability reachabilityWithHostName: @"www.apple.com"] retain]; 
    [hostReachable startNotifier]; 

     if (![self asiqueue]) { 
      [self setAsiqueue:[[[ASINetworkQueue alloc] init] autorelease]]; 
     } 

    NSURL *url = [NSURL URLWithString:@"http://allseeing-i.com/ASIHTTPRequest/Tests/the_great_american_novel.txt"]; 

     self.request = [ASIHTTPRequest requestWithURL:url]; 
     _progressView=locprogressView; 

     self.progressView= locprogressView; 

     [asiqueue cancelAllOperations]; 
     [asiqueue setDownloadProgressDelegate:self.progressView]; 
     [asiqueue setDelegate:self]; 
     [asiqueue setRequestDidFinishSelector:@selector(queueComplete:)]; 
     [asiqueue setShowAccurateProgress:YES]; 
     // [queue setr 

     [request setDelegate:self]; 
     // [request setDidReceiveDataSelector:@selector(didReceiveData:)]; 
     [request setDidFinishSelector:@selector(requestDone:)]; 
     [request setDidFailSelector:@selector(requestWentWrong:)]; 
     [request setAllowResumeForFileDownloads:YES]; 
     [[self asiqueue] addOperation:request]; //queue is an NSOperationQueue 
     [[self asiqueue]go ]; 

} 

，此方法被从checkNetworkStatus叫，我希望它继续下载

- (void)commenceDownloadIfReachabilityIsOkay 
    { 
     if (self.asiqueue && self.hostActive && self.internetActive) 
     { 

      [[self asiqueue]go ]; 

     } 

    } 

这种方法只是不断轮询检查网络状态 - 取自How to check for an active Internet connection on iOS or OSX?

- (void) checkNetworkStatus:(NSNotification *)notice 
{ 
    // called after network status changes 

    NetworkStatus internetStatus = [internetReachable currentReachabilityStatus]; 
    switch (internetStatus) 

    { 
     case NotReachable: 
     { 
      NSLog(@"The internet is down."); 
      self.internetActive = NO; 

      break; 

     } 
     case ReachableViaWiFi: 
     { 
      NSLog(@"The internet is working via WIFI."); 
      self.internetActive = YES; 

      break; 

     } 
     case ReachableViaWWAN: 
     { 
      NSLog(@"The internet is working via WWAN."); 
      self.internetActive = YES; 

      break; 

     } 
    } 

    NetworkStatus hostStatus = [hostReachable currentReachabilityStatus]; 
    switch (hostStatus) 

    { 
     case NotReachable: 
     { 
      NSLog(@"A gateway to the host server is down."); 
      self.hostActive = NO; 

      break; 

     } 
     case ReachableViaWiFi: 
     { 
      NSLog(@"A gateway to the host server is working via WIFI."); 
      self.hostActive = YES; 

      break; 

     } 
     case ReachableViaWWAN: 
     { 
      NSLog(@"A gateway to the host server is working via WWAN."); 
      self.hostActive = YES; 

      break; 

     } 
    } 

    [self commenceDownloadIfReachabilityIsOkay]; 
} 

Answer 1

如果我正确理解你的代码，它是希望呼吁：

[[self asiqueue]go ]; 

将导致前得到重新排队并重新开始下载一段失败ASIHTTPRequest。有两个原因不起作用：

1. 一旦ASIHTTPRequest失败，它将从队列中删除。
2. 上的队列调用go是go已经呼吁不 什么

解决的办法是重新排队，重新启动它的请求。

此外，http://allseeing-i.com/ASIHTTPRequest/How-to-use#resuming_interrupted_downloads说：

此外，还必须设置临时下载路径自己 （setTemporaryFileDownloadPath），与部分数据的路径。

您的代码似乎没有在做什么。 （您还需要setDownloadDestinationPath）