iPhone app login

CSharp kode 

 + (NSString *) createSHA512:(NSString *)source {
     
     const char *s = [source cStringUsingEncoding:NSASCIIStringEncoding];
     
     NSData *keyData = [NSData dataWithBytes:s length:strlen(s)];
     
     uint8_t digest[CC_SHA512_DIGEST_LENGTH] = {0};
     
     CC_SHA512(keyData.bytes, keyData.length, digest);
     
     NSData *out = [NSData dataWithBytes:digest length:CC_SHA512_DIGEST_LENGTH];
     
     return [out description];
 }

CSharp kode 

 - (void) loginAction{
     
     if ([userNameTextField.text isEqualToString:@""] || [passwordTextField.text isEqualToString:@""]) {
         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"alert" message:@"Please Fill all the field" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
         [alert show];
         return;
     }
     // i will use a code from connect to DB tutorial
     NSString *strURL = [NSString stringWithFormat:@"http://localhost/iblogging/engine/index.php?function=login&email=%@&pass=%@",userNameTextField.text, passwordTextField.text];
     
     // to execute php code
     NSData *dataURL = [NSData dataWithContentsOfURL:[NSURL URLWithString:strURL]];
     
     // to receive the returend value
     NSString *strResult = [[NSString alloc] initWithData:dataURL encoding:NSUTF8StringEncoding];
     
     if ([strResult isEqualToString:@"1"])
     {
         // i need to get the control for main navigation controller 
         AppDelegate *appDelegate = [[UIApplication sharedApplication]delegate];
         [appDelegate.navigationController popToRootViewControllerAnimated:NO];
         // create object from app main view to push it
         AppMainView *appMainView = [[AppMainView alloc] initWithNibName:@"AppMainView" bundle:nil];
         [appDelegate.navigationController pushViewController:appMainView animated:YES];
     }else
     {
         // invalid information
         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"alert" message:@"Invalide Information" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
         [alert show];
         return;
         
     }
 }