JSONRepresentation显示错误

Question

我在字典里有一些数据，比如

 NSMutableDictionary *jsonDictionary;
 jsonDictionary = [[NSMutableDictionary alloc] init];
 [jsonDictionary setValue:@"XYZ" forKey:@"CommandType"];
 [jsonDictionary setValue:@"ABC" forKey:@"AppID"];
 [jsonDictionary setValue:@"PQM" forKey:@"UserName"];

 NSURLResponse *response;
 NSError *error;

 NSData *jsonData = [NSJSONSerialization dataWithJSONObject:jsonDictionary options:NSJSONWritingPrettyPrinted error:&error];

 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:
                                [NSURL URLWithString:@"Http://SomeURL"]];

[request setHTTPMethod:@"POST"];
[request setHTTPBody: jsonData];

[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request setValue:[NSString stringWithFormat:@"%d", [jsonData length]] forHTTPHeaderField:@"Content-Length"];

NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
NSString *serverResponse = (NSString *)[[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];

NSMutableDictionary *results = [serverResponse JSONValue];

在我的"results“中，我得到的是null。它有什么问题，并向我显示控制台中的错误。错误如下所示。

 -JSONRepresentation failed. Error trace is: (
"Error Domain=org.brautaset.JSON.ErrorDomain Code=4 \"Not valid type for JSON\" UserInfo=0x6b8d880 {NSLocalizedDescription=Not valid type for JSON}"

 -JSONFragment failed. Error trace is: (
"Error Domain=org.brautaset.JSON.ErrorDomain Code=1 \"JSON serialisation not supported for NSMutableURLRequest\" UserInfo=0x6b8ddf0 {NSLocalizedDescription=JSON serialisation not supported for NSMutableURLRequest}"

能帮我解决这个问题吗？

Answer 1

尝试使用NSJSONSerialization执行到JSON的转换：

NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
id result = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:&error];

如果这不起作用，我很确定这是因为你的服务器返回了空响应。我尝试发送以下请求：

Accept: / Content-Type: application/json Content-Length: 65 Accept-Language: en-us Accept-Encoding: gzip，deflate

{ "AppID"："ABC"，"CommandType"："XYZ"，"UserName"："PQM“}

我得到了以下响应头(没有正文)：

超文本传输协议/1.1 200 OK

日期:星期三，2013年1月30日14:58:43 GMT X-AspNet-Version: 4.0.30319 Content-Length: 0 X-Powered-By: ASP.NET缓存控制:专用服务器:微软-IIS/7.5

内容长度为0。

Answer 2

这一行

[request setHTTPBody: temp];

应该是

[request setHTTPBody: jsonData];

Answer 3

我认为，这对序列化很有帮助你可以尝试下面的Code.NSJSON you.so method.and尝试这个链接NSJSON Serialization JSON

NSError *error = nil;
NSData *jsonData = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://192.168.1.37:3333/UniECommerce/api/store-list.html"]];

    if (jsonData) 
    {
        id jsonObjects = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:&error];

        if (error) 
        {
            NSLog(@"error is %@", [error localizedDescription]);

            // Handle Error and return
            return;
        }

        //NSArray *keys = [jsonObjects allKeys];
        NSArray *keys=[[jsonObjects objectForKey:@"storelist"]valueForKey:@"store_list"];
        // values in foreach loop
        for (NSDictionary *key in keys)// here used to array type key 
        {
            // NSLog(@"%@ is %@",key, [jsonObjects objectForKey:key]);

            if ([key valueForKey:@"store_image"]!=[NSNull null])
            {

              [imageUrls  addObject:[key objectForKey:@"store_image"]];
               // imageUrls [key valueForKey:@"store_image"];
            }
        }