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我正在开发一个从网络服务器获取 JSON 数据的 iphone 应用程序，并且我正在使用 NSURLConnectionDelegate、NSURLConnectionDataDelegate、NSURLConnectionDownloadDelegate 协议。我能够使用 localhost 成功获取数据，但无法从 Internet Web 服务器获取数据。

NSURL*url=[NSURL URLWithString:urlString];
NSURLRequest *theRequest=[NSURLRequest requestWithURL:url
                                          cachePolicy:NSURLRequestUseProtocolCachePolicy
                                      timeoutInterval:60.0];

NSLog(@"%@",theRequest);
// Create the connection with the request and start loading the data.

// NSURLDownload *theDownload = [[NSURLDownload alloc] initWithRequest:Request delegate:self];
NSURLConnection* connection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

其他委托方法如下

  -(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{

mydata =[[NSMutableData alloc] init];
[mydata setLength:0];
 }

  -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{

 UIAlertView*errorView =[[UIAlertView alloc]  initWithTitle:@"Error" message:@"The     download could not be completed- please make sure you are connected to Internet either 3G or Wi-fi" delegate:nil cancelButtonTitle:@"Dismiss" otherButtonTitles:nil];


[errorView show];

  }
  -(void)connectionDidFinishLoading:(NSURLConnection*)connection{

NSArray*jsonArr =[[NSArray alloc] init];



NSError*error;
jsonArr= [NSJSONSerialization JSONObjectWithData:mydata options:NSJSONReadingAllowFragments error:&error];
NSLog(@"%@",error);
NSLog(@"Json Array  %@",jsonArr);
self.questions = [NSMutableArray arrayWithArray:jsonArr];

[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

}

我收到此错误：错误域 = NSCocoaErrorDomain 代码 = 3840“操作无法完成。（可可错误 3840。）”（字符 3 周围的值无效。） UserInfo = 0x71be760 {NSDebugDescription = 字符 3 周围的值无效。}

仅在尝试来自 Internet 网络服务器的数据时出现，并且在访问 localhost 时不会出现

  All the code works perfectly if I use url as http://localhost/example.php but as soon  as             

  I change the url to use the web server url  http://www.example.net/data.php 
  although there is no problem with connection but it returns data as nil.

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