php curl – 发布asp.net viewstate值

<?php
$curl_connection = curl_init('www.external.com/login.aspx');

curl_setopt($curl_connection,CURLOPT_CONNECTTIMEOUT,30);
curl_setopt($curl_connection,CURLOPT_USERAGENT,"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)");
curl_setopt($curl_connection,CURLOPT_RETURNTRANSFER,true);
curl_setopt($curl_connection,CURLOPT_SSL_VERIFYPEER,false);
curl_setopt($curl_connection,CURLOPT_FOLLOWLOCATION,1);

// Post data array
$post_data['LoginControl$UserName'] = 'ExampleUName';
$post_data['LoginControl$Password'] = 'ExamplePWord';

// Add form fields into an array to get ready to post
foreach ($post_data as $key => $value) 
  {
$post_items[] = $key . '=' . $value;
  }
$post_string = implode ('&',$post_items);

// Tell cURL which string to post
curl_setopt($curl_connection,CURLOPT_POSTFIELDS,$post_string);

// Execute and post
$result = curl_exec($curl_connection);
?>

我被定向到外部站点的登录表单,而不是被定向到登录的应用程序.我认为问题是我需要传递viewstate值,但我不知道该怎么做呢？

我无法控制外部应用程序.但我们希望用户能够通过我们的网站登录该应用程序,以维护品牌等.

我最近发布了一些关于php cURL使用的其他线程,但我现在正处于我认为viewstate是问题的阶段……

谢谢,马克.