如何通过json将数据从设备发送到php文件

我无法将数据从设备发送到php文件。我正在尝试使用json从设备发送数据。 这是我的php代码

$cevap = $_POST["cevap"];
echo $cevap;

和我的客户代码：

NSString* postBody = @"cevap=ali";
NSLog(@"%@",postBody);
NSLog(@"postbody: %@",postBody);


NSData *postData = [postBody dataUsingEncoding:NSUTF8StringEncoding];


NSURL* urlData = [NSURL URLWithString:@"http://yatanadam.com/sonuc.php"];



NSMutableURLRequest* request1 = [NSMutableURLRequest requestWithURL:urlData 
                                                       cachePolicy:
                                NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];


[request1 setHTTPMethod:@"POST"];
[request1 setHTTPBody:postData];
 [request1 setValue:[NSString stringWithFormat:@"%d",[postData length]] 
   forHTTPHeaderField:@"Content-Length"];

conn = [[NSURLConnection alloc] initWithRequest:request1 delegate:self];
if (conn) {

    receivedData = [[NSMutableData data] retain];

}

-（无效）连接IDFinishLoading:（NSURLConnection*）连接{

receivedString = [[NSString alloc] initWithData:receivedData  encoding:NSUTF8StringEncoding];
SBJSON *parser = [[SBJSON alloc] init];
result = [parser objectWithString:receivedString error:nil];
[parser release], parser = nil;
// Set tableData
NSLog(@"%@",result);

---

我找不到问题。您能帮我吗？

我建议您使用以下两个库，它们将使您的任务变得非常容易：

• -objc的JSON库
• -objc的HTTP库