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   源码介绍

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

namespace Win32ApiDemo
{
    public partial class AutoChangeVpn : Form
    {
        public AutoChangeVpn()
        {
            InitializeComponent();
        }
        WinAPI.WindowInfo hwnd;//父句柄
        private void btnGetIntPtr_Click(object sender, EventArgs e)
        {
            hwnd = WinAPI.GetProcessIdByName(txtProName.Text.Trim());
            if (hwnd.hWnd != IntPtr.Zero)
            {
                txtHwnd.Text = hwnd.hWnd.ToString();
                txtWinTitle.Text = hwnd.szWindowName;
                txtClassName.Text = hwnd.szClassName;
                listx.AddRange(wi.GetAllChildControls(hwnd.hWnd));//获取所有子元素
            }
            else
            {
                txtHwnd.Text = "获取句柄失败.!";
                txtWinTitle.Text = "请确认[任务管理]";
                txtClassName.Text = "可以看见进程名";
            }
            
        }

        private void btnAutoLogin_Click(object sender, EventArgs e)
        {
            string uname = txtUser.Text.Trim();
            string pwd = txtPass.Text.Trim();
            if (hwnd.hWnd != IntPtr.Zero)
            {
                WinAPI wi = new WinAPI();
                List<WinAPI.WindowInfo> listx = new List<WinAPI.WindowInfo>();
                listx.AddRange(wi.GetAllChildControls(hwnd.hWnd));//获取所有子元素
                List<WinAPI.WindowInfo> editlist = listx.FindAll(p => { return p.szClassName == "Edit"; });//获取所有Class为Edit
                WinAPI.SetText(editlist[0].hWnd, uname);
                WinAPI.SetText(editlist[1].hWnd, pwd);
                List<WinAPI.WindowInfo> btnlist = listx.FindAll(p => { return p.szClassName == "Button"; });//获取所有Class为Button
                for (int x = 0; x < btnlist.Count; x  )
                {
                    string btnName = WinAPI.GetText(btnlist[x].hWnd);
                    if (btnName == "登录")
                    {
                        WinAPI.SendMessage(btnlist[x].hWnd, WinAPI.BM_CLICK, 1, "0"); //点击登录
                        break;
                    }
                }
            }
        }

        private void btnConnect_Click(object sender, EventArgs e)
        {
            //再获得一次.不知道为啥来论坛看答案.
            hwnd = WinAPI.GetProcessIdByName(txtProName.Text.Trim());
            if (hwnd.hWnd != IntPtr.Zero)
            { 
                List<WinAPI.WindowInfo> comblist = listx.FindAll(p => { return p.szClassName == "ComboBox"; });//获取所有Class为ComboBox
                //这里不一定1和2就是国家等,详细判断代码可以用盒子辅助.
                //当然,也可以通过位置或者数量的方式来判断到底因该拿哪一个句柄
                bool setCountry= SetComb(comblist[1].hWnd, txtCountry.Text.Trim());
                bool setRegion = SetComb(comblist[2].hWnd, txtRegion.Text.Trim());
                //别乱删.你没看错,就是要执行两次.至于为啥.不懂来论坛提问.
                setRegion = SetComb(comblist[2].hWnd, txtRegion.Text.Trim());
                if (!setCountry || !setRegion)
                {
                    MessageBox.Show("设置vpn链路失败.!");
                    return;
                }
                ClickButton(listx, "连接"); 
            } 
        }
        /// <summary>
        /// 点击按钮
        /// </summary>
        /// <param name="listx"></param>
        /// <param name="ButtonName"></param>
        private void ClickButton(List<WinAPI.WindowInfo> listx,string ButtonName)
        {
            List<WinAPI.WindowInfo> btnlist = listx.FindAll(p => { return p.szClassName == "Button"; });//获取所有Class为Button
            for (int x = 0; x < btnlist.Count; x  )
            {
                string btnName = WinAPI.GetText(btnlist[x].hWnd);
                if (btnName == ButtonName)
                {
                    WinAPI.SendMessage(btnlist[x].hWnd, WinAPI.BM_CLICK, 1, "0"); //点击登录
                    break;
                }
            }
        }
        private bool SetComb(IntPtr xhwnd,string textstr)
        {
            int i = WinAPI.SendMessage(xhwnd, WinAPI.CB_FINDSTRING, -1, textstr);//获取需要选中的comb元素
            WinAPI.SendMessage(xhwnd, WinAPI.CB_SHOWDROPDOWN, 1, "0");//展开
            WinAPI.SendMessage(xhwnd, WinAPI.CB_SETCURSEL, i, "1");//设置选中
            return i > 0 ? true : false;
        }
        WinAPI wi = new WinAPI(); 
        List<WinAPI.WindowInfo> listx = new List<WinAPI.WindowInfo>();
        private void AutoChangeVpn_Load(object sender, EventArgs e)
        {
            
        }

        private void btnDispose_Click(object sender, EventArgs e)
        {
            ClickButton(listx, "断开"); 
        }
    }
}