Question

我使用以下代码获取JSON响应但返回的响应为nil，即使打印的数据长度为256

NSString *bodyString = [NSString stringWithFormat:@"{\"method\":\"cargo_shipped\",\"data\":{\"username\":\"%@\",\"shipment_no\":\"70088000071790\"}}",username];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://url..."]];
NSLog(@"url %@",request);
NSData *postData = [bodyString dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
[request setHTTPBody:postData];
[request setHTTPMethod:@"POST"];
NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[postData length]];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];


NSOperationQueue *queue = [[NSOperationQueue alloc] init];
NSLog(@"above loop");
[NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError)
 {
     NSLog(@"ENTERED url loop");

     if ([data length] > 0 && connectionError == nil)
     {
         NSLog(@"entered if loop");
         [self receivedCargoShippedData:data];
         NSString* cargoShippedResponse = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

         NSData *jsonDatas = [cargoShippedResponse dataUsingEncoding:NSUTF8StringEncoding];

         NSDictionary *jsonDics = [NSJSONSerialization JSONObjectWithData:jsonDatas options:NSJSONReadingAllowFragments error:nil];
         NSLog(@"Request %@",bodyString);
         NSLog(@"Response %@",jsonDics);
        NSLog(@"result: %lu ",  (unsigned long)[data length]);

     }

     else if ([data length] == 0 && connectionError == nil)
     {
         [self emptyReply];
         NSLog(@"empty %@",connectionError);
     }
     else if (connectionError != nil && connectionError.code == NSURLErrorTimedOut)
     {
         [self timedOut];
         NSLog(@"empty %@",connectionError);
     }

     else if (connectionError != nil)
     {
         [self downloadError:connectionError];
         NSLog(@"empty %@",connectionError);
     } else {
         NSLog(@"%@",@"wtf");
     }
 }];
NSLog(@"finished");

}

代码进入if循环，甚至响应的长度为256.但是，当我尝试获得响应时，它仍为零。

Answer 1

我自己解决了这个问题：

if ([data length] > 0 && connectionError == nil)
{
    NSLog(@"entered if loop");
    [self receivedCargoShippedData:data];
    NSString* forgotPasswordResponse = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

    NSLog(@"Request %@",bodyString);
    NSLog(@"Response %@",forgotPasswordResponse);
}

NSURLConnection响应返回nil

1 个答案: