没有来自服务器的响应,JSON解析，如何获得来自服务器的响应

我有以下细节，用于从服务器获取数据。 methodIdentifier和Web服务名称的用法是什么？JSON解析，如何获得来自服务器的响应

{"zip":"12345","methodIdentifier":"s_dealer"}

url:- http://xxxxxxxxxxxxxxx.com/api.php

method: post

web service name: s_dealer

response : {"success":"0","dealer":[info...]}

我不知道如何发送邮编号码 “12345”的URL。请指导我正确的方向。我使用以下。

-(void)IconClicked:(NSString *)zipNumber

{

NSString *post = [NSString stringWithFormat:@"&zipNumber=%@",zipNumber];

NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

NSString *postLength = [NSString stringWithFormat:@"%d",[postData length]];

NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];

[request setURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://xxxxxxxxxxxxxxxxxxx.com/api.php"]]];

[request setHTTPMethod:@"POST"];

[request setValue:postLength forHTTPHeaderField:@"Content-Length"];

[request setHTTPBody:postData];

NSURLConnection *conn = [[NSURLConnection alloc]initWithRequest:request delegate:self];

if(conn)

{

NSLog(@"Connection Successful");

}

else

{

NSLog(@"Connection could not be made");

}

receivedData = [[NSMutableData alloc]init];

}

当我打印在控制台响应：不知道更多有关API \