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来源：互联网发布：梁成军被双开知乎编辑：程序博客网时间：2024/04/29 08:06

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace Rohan
{
    class Program
    {

           [DllImport("User32.dll",EntryPoint="SendMessage")]
              private   static   extern   int   SendMessage(
                                          int   hWnd,             //   handle   to   destination   window
                                          int   Msg,               //   message
                                          int   wParam,       //   first   message   parameter
                                          string   lParam         //   second   message   parameter
                );
              [DllImport("User32.dll",EntryPoint="FindWindow")]
              private   static   extern   int   FindWindow(string   lpClassName,string
lpWindowName);

[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

              [DllImport("user32.dll", SetLastError = true)]
              public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string className, IntPtr windowTitle);
              //定义消息常数
              const int WM_GETTEXT = 0x000D;
              const int WM_SETTEXT = 0x000C;
              const int WM_CLICK = 0x00F5;
              const int WM_SHOWDROPDOWN = 0x014D;//在窗体中声明消息常量
              const int WM_SETCURSOR = 0x14F;
              const int CB_FINDSTRING = 0x14C;
              const int WM_LBUTTONDBLCLK = 0x203;//双击鼠标左键

        static void Main(string[] args)
        {
            /*
            string str = "NGSNLL";
            int WINDOW_HANDLER = FindWindow(null, @"无标题 - 记事本");
            if (WINDOW_HANDLER == 0)
            {
                throw new Exception("Could   not   find   Main   window!");
            }
            SendMessage(WINDOW_HANDLER, WM_SETTEXT, 0,str);
             */

int WINDOW_HANDLER = FindWindow(null, @"计算器");
int buttonhwnd = FindWindowEx(WINDOW_HANDLER, IntPtr.Zero, "C", "Button");

SendMessage(buttonhwnd,WM_LBUTTONDBLCLK, 0, null);

        }
    }
}