Getting Data from server in json format using POST method

-(void)httpPostWithCustomDelegate

{

    NSError *error;

    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];

    NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];

    NSURL * url = [NSURL URLWithString:@"http://four-developers.com/service1.svc/GetPostData"];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url

                                                           cachePolicy:NSURLRequestUseProtocolCachePolicy

                                                       timeoutInterval:60.0];

    [request addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];

    [request addValue:@"application/json" forHTTPHeaderField:@"Accept"];

    [request setHTTPMethod:@"POST"];

    NSMutableDictionary* mapData = [[ NSMutableDictionary alloc ] init ];

    [ mapData setObject :@"aa" forKey : @"value" ];

    NSData *postData = [NSJSONSerialization dataWithJSONObject:mapData options:0 error:&error];

    [request setHTTPBody:postData];

    NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)

    {

        NSError *err = nil ;

        

        NSDictionary   *responseDict = [ NSJSONSerialization JSONObjectWithData :data options : 0 error :&err];

        

        NSDictionary *dict = [responseDict objectForKey : @"GetPostDataResult" ];

        NSLog(@"%@",dict);

    }];

    

    [postDataTask resume];

    

}

        OR

Note: before starting coding for retreiveDataFromPOST you must be need to import afnetworking library...

 Sample code

OR

http://four-developers.com/documents/UsingAFNetworking.zip

-( void )retreiveDataFromPOST

{

    NSURL *url = [[ NSURL alloc ] initWithString :@"http://four-developers.com/service1.svc/GetPostData"];

    AFHTTPClient *httpClient = [[ AFHTTPClient alloc ] initWithBaseURL :url];

    

    [httpClient setParameterEncoding : AFJSONParameterEncoding ];

    

    [httpClient registerHTTPOperationClass :[ AFHTTPRequestOperation class ]];

    

    [httpClient setDefaultHeader : @"Content-Type" value : @"application/json" ];

    

    NSMutableDictionary* LoginDict = [[ NSMutableDictionary alloc ] init ];

    [ LoginDict setObject :@"aa" forKey : @"value" ];

    

    NSMutableURLRequest *request = [httpClient requestWithMethod : @"POST"

                                    

                                                            path :[url path ]

                                    

                                                      parameters : LoginDict ];

    

    [request setTimeoutInterval : 200 ];

    

    AFHTTPRequestOperation *operation = [[ AFHTTPRequestOperation alloc ] initWithRequest :request];

    

    [operation setCompletionBlockWithSuccess :^( AFHTTPRequestOperation *operation, id responseObject) {

        

        // Print the response body in text

        

        NSError *err = nil ;

        

        NSDictionary   *responseDict = [ NSJSONSerialization JSONObjectWithData :responseObject options : 0 error :&err];

      

        NSDictionary *dict = [responseDict objectForKey : @"GetPostDataResult" ];

        NSLog(@"%@",dict);

       

        

    }

    failure :^( AFHTTPRequestOperation *operation, NSError *error)

     

     {

         

         NSLog ( @"error login %@" ,error);

         UIAlertView *alert = [[ UIAlertView alloc ] initWithTitle : @"Alert" message : @"Network Failure" delegate : nil cancelButtonTitle : @"OK" otherButtonTitles : nil , nil ];

         

         [alert show ];

         

               self . view . userInteractionEnabled = YES ;

     }];

    

    [operation start ];

}