xcode using json and POST to validate a username and password - ios

Question

I am new to using POST, and have just written a code that takes a username and password that was entered in and sends it via POST for validation. If it is valid, it will return true, if not it will return false. I think my code works for the most part, but there must be something missing with my return data because it does not output true or false. Here is my code:
- (IBAction)btnLogIn:(id)sender;
{
//getting the username and password and putting it into a string
NSString *post =[[NSString alloc] initWithFormat:#"username= %# &password =%#",[self.lblUserName text],[self.lblPassword text]];
//output the string
NSLog(#"PostData: %#",post);
//setting the URL to post to
NSURL *url=[NSURL URLWithString:#"myurl.php"];
//converts string to data that can be used to post
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
//get the length of the string
NSString *postLength = [NSString stringWithFormat:#"%lu", (unsigned long)[postData length]];
//formatting the URL
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init] ;
[request setURL:url];
[request setHTTPMethod:#"POST"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:postData];
NSURLResponse *requestResponse;
NSData *requestHandler = [NSURLConnection sendSynchronousRequest:request returningResponse:&requestResponse error:nil];
NSString *requestReply = [[NSString alloc] initWithBytes:[requestHandler bytes] length:[requestHandler length] encoding:NSASCIIStringEncoding];
NSLog(#"requestReply: %#", requestReply);
}
I am not sure what part is missing or wrong. Everything runs fine, just returns blank when I test it out.

Answer 1

this is another method
//Create the request
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:#"myurl.php"]];
// create the Method "GET" or "POST"
[request setHTTPMethod:#"POST"];
//Pass The String to server
NSString *userUpdate =[NSString stringWithFormat:#"username=%#&password=%#",[self.lblUserName text],[self.lblPassword text],nil];
//Check The Value what we passed
NSLog(#"the data Details is =%#", userUpdate);
//Convert the String to Data
NSData *data1 = [userUpdate dataUsingEncoding:NSUTF8StringEncoding];
//Apply the data to the body
[request setHTTPBody:data1];
//Create the response and Error
NSError *err;
NSURLResponse *response;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&err];
NSString *resSrt = [[NSString alloc]initWithData:responseData encoding:NSASCIIStringEncoding];
//This is for Response
NSLog(#"got response==%#", resSrt);
if(resSrt)
{
NSLog(#"got response");
}
else
{
NSLog(#"faield to connect");
}