当 json 数据的值发布到 .net Web 服务时出现 Json Failed 错误？答案

【问题标题】：Getting Json Failed error while values of json data are posting to .net web service?当 json 数据的值发布到 .net Web 服务时出现 Json Failed 错误？
【发布时间】：2012-10-10 22:49:52
【问题描述】：

我将 json 数据发布到 .net 网络服务。我正在使用下面的代码。在检查 web 服务时它显示 MessageValue:Failed。

-(void)sentSignUpDetails { NSLog(@"sentSignUpDetails.......");

NSString *jsonRequest = [NSString stringWithFormat:@"{\"UserName\":\"%@\",\"Password\":\"%@\",\"DeviceToken\":\"%@\"}",self.emailtextfield.text,self.passwordtextfield.text,appDelegate.Devicetoken];

NSLog(@"jsonRequest is %@", jsonRequest);
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://brewedlife.testshell.net/Brewedlife/AppSignup"]];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];

NSLog(@"1239");
NSData *requestData = [NSData dataWithBytes:[jsonRequest UTF8String] length:[jsonRequest length]];

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

con = [NSURLConnection connectionWithRequest:request delegate:self];

}

(void) 连接:(NSURLConnection *)connection didReceiveData:(NSData *)data1

{

 if (!data) 
  {
    data = [[NSMutableData alloc] initWithData:data1];
  }

 else 
  {
    [data appendData:data1];
  }

} 它得到 json failed 错误，如下所示 -JSONValue failed。错误跟踪是：（ "Error Domain=org.brautaset.JSON.ErrorDomain Code=3 \"Unrecognizedleading character\" UserInfo=0x15e880 {NSLocalizedDescription=Unrecognizedleading character} 请给出任何想法。谢谢

【问题讨论】：

标签： iphone objective-c ios xcode

【解决方案1】：

像这样创建您的 JSON 请求

NSDictionary *jsonDict = [NSDictionary 字典WithObjectsAndKeys： @"ValueOfUsername", @"keyOfUserName", @"ValueOfPassword", @"Password", @"ValueOfDeviceToken", @"DeviceToken",nil];
NSString *req = [jsonDict JSONRepresentation];

如果您收到编码错误，请查看这是否有效 NSUTF8StringEncoding

【讨论】：