Cocoa错误3840使用JSON（iOS） [英] Cocoa error 3840 using JSON (iOS)

问题描述

我正在尝试将数据发送到服务器，并以JSON格式接收响应。问题是服务器必须返回成功或失败，但它返回（null）。

I'm trying to send data to a server and receive the response in JSON format. The problem is that the server has to return "success" or "fail" but it returns "(null)".

这是返回的错误：

错误Domain = NSCocoaErrorDomain Code = 3840操作不能是
完成（Cocoa错误3840.）（JSON文本没有启动与数组或
对象和选项允许片段不设置。）UserInfo = XXXXXXXXX
{NSDebugDescription = JSON文本没有开始与数组或对象和
选项允许片段未设置} / p>

Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (JSON text did not start with array or object and option to allow fragments not set.) UserInfo=XXXXXXXXX {NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}

错误是否可能在服务器脚本中？任何想法？非常感谢！

Is it possible that the error is in the server script? Any idea? Thanks!

这是我发送数据并接收响应的函数：

Here's my function to send the data and receive the response:

- (void) putData:(NSString *)parametre valor:(NSString *)valor {

    NSString *rawString = [NSString stringWithFormat:@"%@=%@", parametre, valor];
    NSData *data = [rawString dataUsingEncoding:NSUTF8StringEncoding];
    NSURL *url = [NSURL URLWithString:@"http://www.xxx.xxx/xxx.php"];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setHTTPMethod:@"PUT"];
    [request setHTTPBody:data];
    NSURLResponse *response;
    NSError *error;
    NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    NSMutableDictionary *json = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
    NSLog(@"responseData: %@ error: %@", json, error);
}

推荐答案

code> NSJSONReadingAllowFragments 到 [NSJSONSerialization JSONObjectWithData：options：error：] 来自服务器的响应必须是有效的JSON与顶层容器这是一个数组或字典。

Unless you pass the option NSJSONReadingAllowFragments to [NSJSONSerialization JSONObjectWithData:options:error:] the response from the server must be valid JSON with a top level container which is an array or dictionary.

例如：

    { "response" : "Success" }

PS
如果你想要一个可变字典，你还必须在你的选项中包含 NSJSONReadingMutableContainers 。

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