以前我用AVAudioPlayer玩linkUrl，我想知道linkUrl有效

Question

以前我用AVAudioPlayer玩linkUrl，我想知道linkUrl有效...

NSURL *url = [NSURL URLWithString:@"http://pan.baidu.com/share/link?shareid=392285&uk=2117415770"]; 
NSData *voiceData = [NSData dataWithContentsOfURL:url]; 

Answer 1

您可以使用下面的代碼來檢查如果文件存在服務器上或不存在

NSURLRequest* request = [NSURLRequest requestWithURL:[NSURL URLWithString:url] 
              cachePolicy:NSURLRequestUseProtocolCachePolicy 
             timeoutInterval:5.0]; 

    NSHTTPURLResponse *response = nil; 

    __autoreleasing NSError *error = nil; 

    [NSURLConnection sendSynchronousRequest:request 
          returningResponse:&response 
             error:&error]; 
    if (error) 
     DLog(@"[%@ %@] %@ (%@)", 
      NSStringFromClass([self class]), 
      NSStringFromSelector(_cmd), 
      [error localizedDescription], 
      [error localizedFailureReason]); 
    else 
    { 
     if ([response statusCode] == 404) 
     { 
      NSLog(@"File Doesn't exist"); 
     } 
     else 
     { 
      NSLog(@"File exist"); 
     } 
    }