iOS5 Json序列化

我已经使用JSON序列化来获得JSON响应，在这里我会得到所有的好结果，但是当我需要发布一些值作为URL的键值对时。我已经这样做了，但是没有得到结果

NSArray *objects = [NSArray arrayWithObjects:@"uname", @"pwd", @"req",nil];
NSArray *keys = [NSArray arrayWithObjects:@"ann", @"ann", @"login", nil];
NSDictionary *dict = [NSDictionary dictionaryWithObjects:keys forKeys:objects];


if ([NSJSONSerialization isValidJSONObject:dict]) {
    NSError *error;

    result = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&error];

    if (error == nil && result != nil) {
       // NSLog(@"Success");
    }
}

NSURL * url =[NSURL URLWithString:@"URL_address_VALUE/index.php"];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60];

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

NSURLResponse *res = nil;
NSError *error = nil;

NSData *ans = [NSURLConnection sendSynchronousRequest:request returningResponse:&res error:&error];

if (error == nil) {

    NSString *strData = [[NSString alloc]initWithData:ans encoding:NSUTF8StringEncoding];

    NSLog(@"%@",strData);
}

---

我不知道这里出了什么问题。。。请各位帮帮我。

您的代码中有多个错误，请使用我的代码作为参考，并将其与您的代码进行比较，您将完成错误处理。 从Objective-C的角度来看，下面的代码工作正常。关于您的URL或服务端，存在一些错误

工作代码：

NSMutableDictionary *dict = [[NSMutableDictionary alloc] initWithObjectsAndKeys:@"ann",@"uname",@"ann",@"pwd",@"login",@"req", nil];
NSLog(@"dict :: %@",dict);
NSError *error2;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dict options:kNilOptions error:&error2];
NSString *post = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];
NSLog(@"postLength :: %@",postLength);
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:@"http://exemplarr-itsolutions.com/dbook/index.php"]];
[request setHTTPMethod:@"POST"];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
[request setHTTPBody:postData];

NSURLResponse *response;
NSError *error3;
NSData *POSTReply = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error3];
NSString *str = [[NSString alloc] initWithData:POSTReply encoding:NSUTF8StringEncoding];
NSLog(@"str :: %@",str);

---

NSLog没有显示任何内容@Vin@HarishSaran：检查我的更新。@HarishSaran:使用我提供的代码。我更改了URL，但不起作用。这是o/p:2013-06-11 19:19:35.545 JSON5[24317:15d03]str:：您没有指出任何错误检查是否捕获了任何内容。