iOS调用Web服务在4g上不起作用

我正在编写一个调用JSON Web服务的应用程序。当iPhone连接到WiFi网络时，它工作正常。但是，当它使用蜂窝数据网络时，它不起作用。我收到[NSJSONSerialization JSONObjectWithData：data options：kNilOptions错误：&错误]返回的错误。这里是我的代码：返回iOS调用Web服务在4g上不起作用

-(BOOL) CallService { 
    NSError *error; 
    NSData *paramData = [NSJSONSerialization dataWithJSONObject:self.parameter options:kNilOptions error:&error]; 

    NSString *serviceUrl = [[NSString alloc] initWithFormat:@"%@%@", self.webHost, self.serviceName]; 
    NSURL *url = [NSURL URLWithString:serviceUrl]; 
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; 
    [request setHTTPMethod:@"POST"]; 
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"]; 
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; 
    [request setValue:@"json" forHTTPHeaderField:@"Data-Type"]; 
    [request setValue:[NSString stringWithFormat:@"%d", [paramData length]] forHTTPHeaderField:@"Content-Length"]; 
    [request setHTTPBody:paramData]; 
    NSError *errorReturned = nil; 
    NSURLResponse *theResponse =[[NSURLResponse alloc]init]; 
    NSData *data = [NSURLConnection sendSynchronousRequest:request 
             returningResponse:&theResponse 
                error:&errorReturned]; 

    BOOL retVal = FALSE; 

    if (errorReturned){ 
     //...handle the error 
     NSLog(@"%@", errorReturned.description); 
    } 
    else { 
     self.serviceResult = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error]; 
     NSLog(@"%@", error); 
     retVal = (BOOL)[self.serviceResult objectForKey:@"Success"]; 
    } 

    return retVal; 
}

和错误是：像你的数据你是JSON编码或结果混淆

purgeIdleCellConnections: found one to purge conn = 0x1d04d710 
2012-11-07 20:17:43.776 iPressBoxx-iPhone[733:907] 
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=0x1d04eff0 {NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}

来源

2012-11-08 Dan

返回的响应是什么？ – simbolo

你有任何解决方案吗？ – brush51

声音听起来我。

这里最好的办法是打印出所有的原始数据或者使用Charles Proxy（http://charlesproxy.com）这样的东西来拦截网络请求并查看正在发生的事情。

来源

2012-12-24 23:02:35

iOS调用Web服务在4g上不起作用

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