Using POST method to get the cookies(by clicking button)

Discussion in 'iOS Programming' started by MarkSiu, Jun 27, 2010.

  1. MarkSiu macrumors newbie

    Jun 27, 2010

    I face some problems about the url POST method and the cookies

    The program requires the users to enter 2 parameters into the UItextField. And then the user has to click a button to submit the data through the url POST method and then the cookies of the website will be return to the application. There are some http 302(redirect) or 303 in some of the website. The url is a 'https', not 'http'.

    I have complete the GET method to some websites. However, there are some problems when I use the POST method.

    The following is the coding of my program.

    // GET method
    NSString *urlString = [NSString stringWithFormat:@""]; 
    NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease]; 
    [request setURL:[NSURL URLWithString:urlString]]; 
    [request setHTTPMethod:@"GET"]; 
    NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; 
    NSString *results = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
    // POST method
    NSString *post = [NSString stringWithFormat:@"username=%@&password=%@", textFieldUsername.text, textFieldPassword.text];	
    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];
    NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
    [request setURL:[NSURL URLWithString:@"https://url"]]; // the url is the website url, https
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPBody:postData];
    I have not idea about the error.
    I put the code within the viewController.m, - (IBAction)pressLoginButton:(id)sender
    Can any help me?
    Thank you very much.
  2. jnic macrumors 6502a

    Oct 24, 2008
    Set up a delegate for your NSURLConnection and log the error it's returning.
  3. MarkSiu thread starter macrumors newbie

    Jun 27, 2010
    Thank you for your reply.
    Do you mean this?

    NSHTTPURLResponse *response = nil;
    NSError *error = nil;
    NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    After typing the above code, I cannot get the code back.
    However, I faces another big problems.

    Before enter to the url in my first post. I have to use a GET method go to a website first and get the cookies.

    It means that the flow is
    Website X (GET method, get the cookies) --> Website Y (The post url, POST method, to get the user enter parameters)
    --> 302/303 (have to store all the cookies during the redirection of http status) --> 200 and have store all the cookies

    Btw, what is delegate the NSURLConnection? Is there are any relationship between the NSMutableURLRequest and NSURLConnection?

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