iPhone发出POST请求，处理cookie

我希望有人能够阐明以下内容，我认为我正在朝着正确的方向前进。我想使用用户/密码组合登录我的服务器，然后我需要能够判断我是否正确登录（应该删除 cookie），如果是这种情况，我将发出另一个请求。

感谢任何帮助，这是我正在使用的代码：

[[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookieAcceptPolicy:NSHTTPCookieAcceptPolicyAlways];

NSString *post =[NSString stringWithFormat:@"name=%@&pass=%@",@"foo", @"bar"];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];

NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:@"http://www.mywebserver.com/login.php"]];
[request setHTTPMethod:@"POST"];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:postData];

NSError *error;
NSURLResponse *response;
NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
NSString *data=[[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding];
NSLog(data);

// HOW to Check if there was a Cookie dropped??


// Make another request..

这应该有效：

NSDictionary *headerFields = [(NSHTTPURLResponse*)response allHeaderFields]; 
NSURL *url = [NSURL URLWithString:@"http://www.mywebserver.com/login.php"];   
NSArray *cookies = [NSHTTPCookie cookiesWithResponseHeaderFields:headerFields forURL:url];

然后你就可以知道是否cookies数组包含你想要的cookie。

您也可以在收到响应后调用此方法：

NSArray *cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:url];