无法将Json解析为NSDictionary [英] Cannot parsing Json to NSDictionary

问题描述

我有一个WebService，它让我退回Json-String：

I have a WebService, which give me the fallowing Json-String back:

"{\"password\" : \"1234\",  \"user\" : \"andreas\"}"

我调用webservice并尝试解析返回的数据，如：

I call the webservice and try to parse the returned data like:

[NSURLConnection sendAsynchronousRequest: request
                                   queue: queue
                       completionHandler: ^(NSURLResponse *response, NSData *data, NSError *error) {


        if (error || !data) {
           // Handle the error
        } else {
           // Handle the success
           NSError *errorJson = nil;
           NSDictionary *responseDict = [NSJSONSerialization JSONObjectWithData: data options: NSJSONReadingMutableContainers error: &errorJson];
           NSString *usr = [responseDict objectForKey:@"user"];
        }
   }
 ];

但是得到的NSDictionary看起来像：

But the resulting NSDictionary looks like:

有什么影响，我无法获得价值 - 例如用户。
有人可以帮助我吗，我做错了什么？ - 谢谢。

What has the effect, that I cannot get the values - for example user. Can someone help me, what I am doing wrong? - Thank you.

推荐答案

从调试器截图看来，服务器（无论出于何种原因）返回
嵌套的JSON： responseDict [@d] 是一个包含JSON数据的字符串，所以你需要
apply NSJSONSerialization 两次：

From the debugger screenshot is seems that the server is (for whatever reason) returning "nested JSON": responseDict[@"d"] is a string containing JSON data again, so you have to apply NSJSONSerialization twice:

NSError *errorJson = nil;
NSDictionary *responseDict = [NSJSONSerialization JSONObjectWithData: data options:0 error: &errorJson];
NSData *innerJson = [responseDict[@"d"] dataUsingEncoding:NSUTF8StringEncoding];
NSMutableDictionary *innerObject = [NSJSONSerialization JSONObjectWithData:innerJson options:NSJSONReadingMutableContainers error:&errorJson];
NSString *usr = [innerObject objectForKey:@"user"];

如果您有选择，更好的解决方案是修复Web服务以返回
适当的JSON数据。

If you have the option, a better solution would be to fix the web service to return proper JSON data.

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