Question

我正面临着问题。我正在发送Asynchronus NSUrlrequest调用，但作为回报，我得到了多次响应json的某些部分

有人可以帮我解决我的错误。

码

NSString *_query = @"http://abc.com/index.php";

    NSData *myRequestData = [NSData dataWithBytes:[_requestString UTF8String] 
                                       length:[_requestString length]];


    __block NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:_query]]; 

    [request setHTTPMethod: @"POST" ];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"content-type"];
    [request setHTTPBody: myRequestData ];

    [[NSURLConnection alloc] initWithRequest:request delegate:self];

    NSRunLoop *runLoop = [NSRunLoop currentRunLoop];

    [runLoop addTimer:timeOutTimer forMode:NSDefaultRunLoopMode];

响应

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data 
{
    // check is response is a valid JSON?
    NSError *error;

    id jsonObj = [NSJSONSerialization JSONObjectWithData: data options:kNilOptions error:&error];
    BOOL isValid = [NSJSONSerialization isValidJSONObject:jsonObj];


    NSString *content = [[NSString alloc] initWithData:data 
                                              encoding:NSUTF8StringEncoding];

    NSLog(@"Content: %@",content);

    if (isValid)
    {
        NSDictionary *data = [content JSONValue];
    }


    [content release];
}

Answer 1

当客户端收到数据时，会调用此回调函数：

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

didReceiveData在接收数据时为您提供数据，并且可以使用数据块多次调用。

来自NSURLConnection docs：

委托定期发送连接：didReceiveData：messages 收到数据。代表实施负责用于存储新接收的数据。

从那些文档：

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    // Append the new data to receivedData.
    // receivedData is an instance variable declared elsewhere.
    [receivedData appendData:data];
}

完成所有操作后，将调用connectionDidFinishLoading，您可以使用附加的数据。

最后，如果连接成功下载请求，则 delegate收到connectionDidFinishLoading：消息。该代表将不再收到有关连接和消息的消息 NSURLConnection对象可以被释放。

异步NSURLConnection请求多次响应

1 个答案: