c#获取外部程序的某个按钮句柄并触发点击事件？-CSDN论坛-CSDN.NET-中国最大的IT技术社区

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

namespace ConsoleApplication1
{
    class Program
    {
        [DllImport('user32.dll', EntryPoint = 'FindWindow', CharSet = CharSet.Auto)]
        static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
        [DllImport('user32.dll', EntryPoint = 'FindWindowEx', CharSet = CharSet.Auto)]
        extern static IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
        [DllImport('User32.dll', EntryPoint = 'SendMessage')]
        private static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, string lParam);

        [STAThread]
        static void Main(string[] args)
        {
            string path = 'C:\\WINDOWS\\system32\\calc.exe';
            Process p = Process.Start(path);
            if (p == null)
                Console.WriteLine('Warning:process may already exist');


            Console.WriteLine('Finding main window handle');
            IntPtr mainWindows = FindMainWindowHandle('计算器', 100, 25);
            Console.WriteLine('Handle to main window is ' + mainWindows);

            //有名字控件句柄
            Console.WriteLine('Findding handle to button1');
            IntPtr butt = FindWindowEx(mainWindows, IntPtr.Zero, null, 'Backspace');//这里的1是，计算器上名字为1的按钮
            if (butt == IntPtr.Zero)
                throw new Exception('Unable to find button1');
            else
                Console.WriteLine('Handle to button1 is ' + butt);
                SendMessage(mainWindows, 0X101, butt, null); 
               

            //没有名字或者重名控件
            //Console.WriteLine('Findding handle to listbox1');
            //IntPtr lb = FindWindowByIndex(mwh, 3);
            //if (lb == IntPtr.Zero)
            //    throw new Exception('Unable to find listbox1');
            //else
            //    Console.WriteLine('Handle to listbox1 is ' + lb);

        }

        //通过索引查找相应控件句柄
        static IntPtr FindWindowByIndex(IntPtr hwndParent, int index)
        {
            if (index == 0)
            {
                return hwndParent;
            }
            else
            {
                int ct = 0;
                IntPtr result = IntPtr.Zero;
                do
                {
                    result = FindWindowEx(hwndParent, result, null, null);
                    if (result != IntPtr.Zero)
                    {
                        ++ct;
                    }
                } while (ct < index && result != IntPtr.Zero);
                return result;
            }
        }

        //获得待测程序主窗体句柄
        private static IntPtr FindMainWindowHandle(string caption, int delay, int maxTries)
        {
            IntPtr mwh = IntPtr.Zero;
            bool formFound = false;
            int attempts = 0;
            while (!formFound && attempts < maxTries)
            {
                if (mwh == IntPtr.Zero)
                {
                    Console.WriteLine('Form not yet found');
                    Thread.Sleep(delay);
                    ++attempts;
                    mwh = FindWindow(null, caption);
                }
                else
                {
                    Console.WriteLine('Form has been found');
                    formFound = true;
                }
            }

            if (mwh == IntPtr.Zero)
                throw new Exception('Could not find main window');
            else
                return mwh;
        }
    }
}

我用windows的计算器做的试验。
这里的0X101是个啥东东？为啥这句话执行了没有任何反应？
SendMessage(mainWindows, 0X101, butt, null); 

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