我正在开展一个项目，我需要登录一个站点，登录后检索URL并解析数据。到目前为止，我已经能够在不登录的情况下解析我需要的一些站点数据，但现在我需要登录才能检索其余的数据。
我不确定如何登录并存储会话，以便我可以检索另一个URL。我从以下代码获得的响应不包含任何数据。 responseData和responseString为空。
- (void) login {
NSMutableURLRequest *loginRequest = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://www.theSite.com/booker/admin.php"]];
NSString *postString = @"go=1&NewUserName=testUserName&NewUserPassword=testPassword&returl=http://www.theSite.com/booker/day.php?day=12&month=08&year=2012&area=0&room=3&TargetURL=http://www.theSite.com/booker/day.php?day=12&month=08&year=2012&area=0&room=3&day.php?day=12&month=08&year=2012&area=0&room=3&Action=SetName";
[loginRequest setHTTPMethod:@"POST"];
[loginRequest setValue:[NSString stringWithFormat:@"%d", [postString length]]
forHTTPHeaderField:@"Content-length"];
[loginRequest setHTTPBody:[postString dataUsingEncoding:NSUTF8StringEncoding]];
[[NSURLConnection alloc] initWithRequest:loginRequest delegate:self];
}
- (void) connectionDidFinishLoading:(NSURLConnection *)connection {
responseData = [NSMutableData new];
NSString* responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSLog(@"the html was %@", responseString);
}