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   源码介绍

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原理：利用qq的快速登陆功能提取已经登陆的qq号信息

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Text.RegularExpressions;

namespace GetLoginQQDemo
{
	
	public partial class Form1 : Form
	{

		private string url = "http://xui.ptlogin2.qq.com/cgi-bin/qlogin?domain=qq.com&lang=2052&qtarget=1&jumpname=&appid=549000912&ptcss=undefined&param=u1%253Dhttp%25253A%25252F%25252Fqun.qzone.qq.com%25252Fgroup&css=&mibao_css=&s_url=http%253A%252F%252Fqun.qzone.qq.com%252Fgroup&low_login=0&style=12&authParamUrl=&needVip=1&ptui_version=10028";

		private WebBrowser web = new WebBrowser();
		public Form1()
		{
			InitializeComponent();

			lvwUins.Columns.Add("昵称", 100);
			lvwUins.Columns.Add("QQ号码", 100);
			
			web.Url = new Uri(url);
		}

		private void button1_Click(object sender, EventArgs e)
		{
			if(web.ReadyState != WebBrowserReadyState.Complete){
				MessageBox.Show("网页尚未加载完毕,请稍等.");
				return;
			}

			lvwUins.Items.Clear();

			HtmlDocument doc = web.Document;
			HtmlElement uinList = doc.GetElementById("list_uin");
			if(uinList != null){
				for (int i = 0; i < uinList.Children.Count; i  ) {
					string str = uinList.Children[i].InnerText.Trim();
					
					//分割昵称和QQ号码
					string[] temp = str.Split(' ');
					string nick = temp[0];
					string uin = temp[1];
				
					//去除括号
					uin = uin.Replace("(", "").Replace(")", "");

					ListViewItem item = new ListViewItem();
					item.Text = nick;
					item.SubItems.Add(uin);
					lvwUins.Items.Add(item);
				}
			}
		}
	}
}