C#中用WinAPI调用外部程序~~~

在使用别人的程序时，我们常发现一些好的功能，想通过自己的程序来重复调用。可偏偏这个程序没有留可编程接口，无法通过API、DLL、COM等方式实现 调用。早些年与同仁们讨论时，常对此深表遗憾。最近，通过研究Windows API的使用方法，终于从理论上解决了这一问题，即可通WinAPI中SendMessage、EnumChildWindows等，从模拟操作的角度来调用指定程序的指定功能。

我们知道，Windows是消息驱动的，即Windows窗口、控件的任何操作，都是通过消息事件来完成的。从理论上讲，在我们自己的程序中，只要能准确地找到相应功能所在的窗口或控件的句柄Handle， 发出相应的消息，即可完成相应任务。从这个层面上，这种技术可以应用在所有windows程序上。只是这种技术的处理，需要非常细心。因为在实际应用中， 从某一个程序中找到相应的控件（包括Parent/Child/Next等）还是比较麻琐的，一不小心，调用的功能就实法实现，还有可能导致程序甚至系统 的崩溃。所以，这种技术的关键在于两个地方：一是找准句柄，二是找对消息。

推荐分析一个窗体（控件）的句柄或消息的工具：SPY++，这在Visual Studio Tools中有，操作起来很简单。



C#中实现外部程序调用，可以通过封装User32.dll中sendmessage等函数来实现。我已将常用的功能封装成一个类：

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

namespace MuliCall
{
    class WinApi
    {
        #region  宏定义


        public const int WM_KEYDOWN = 0x100;
        public const int WM_KEYUP = 0x101;
        public const int VK_CONTROL = 0x11;
        public const int VK_F5 = 0x74;
        public const int KEYEVENTF_KEYUP = 0x2;
        public const int VK_MENU = 0x12;
        public const int WM_SETTEXT = 0xC;
        public const int WM_CLEAR = 0x303;
        public const int BN_CLICKED = 0;
        public const int WM_LBUTTONDOWN = 0x201;
        public const int WM_LBUTTONUP = 0x202;
        public const int WM_CLOSE = 0x10;
        public const int WM_COMMAND = 0x111;
        public const int WM_SYSKEYDOWN = 0x104;

        #endregion


        public delegate bool EnumChildWindowsProc(IntPtr hwnd, int lParam);

        #region  WinAPI定义


        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        public static extern int SendMessage(
            int hWnd, // handle to destination window 

            int Msg, // message 

            int wParam, // first message parameter 

             int lParam // second message parameter 
        );
        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        public static extern int SendTxtMessage(
            int hWnd, // handle to destination window 

            int Msg, // message 

            int wParam, // first message parameter 

            char[] lParam
            // int  lParam // second message parameter 

        );
        [DllImport("user32.dll", EntryPoint = "PostMessage")]
        public static extern int PostMessage(
            int hwnd,
            int wMsg,
            int wParam,
            int lParam
        );

        [DllImport("user32.dll", EntryPoint = "FindWindow")]
        public static extern int FindWindow(
            string lpClassName,
            string lpWindowName
        );
        [DllImport("user32.dll", EntryPoint = "FindWindowEx")]
        public static extern int FindWindowEx(
            int hwndParent,
            int hwndChildAfter,
            string lpszClass,
            string lpszWindow
        );
        [DllImport("user32.dll", EntryPoint = "EnumChildWindows")]
        public static extern int EnumChildWindows(
            int hWndParent,
            int lpEnumFunc,
            int lParam
        );

        [DllImport("user32.dll", EntryPoint = "EnumChildWindows")]
        public static extern int EnumChildWindows(
            int hWndParent,
            EnumChildWindowsProc lpEnumFunc,
            int lParam
        );

        [DllImport("user32.dll", EntryPoint = "SetFocus")]
        public static extern int SetFocus(
            int hWnd
        );

        [DllImport("user32.dll", EntryPoint = "SetWindowText")]
        public static extern int SetWindowText(
            int hwnd,
            string lpString
        );

        [DllImport("user32.dll", EntryPoint = "keybd_event")]
        public static extern void keybd_event(
            byte bVk,
            byte bScan,
            int dwFlags,
            int dwExtraInfo
        );

        [DllImport("user32.dll", EntryPoint = "SetForegroundWindow")]
        public static extern int SetForegroundWindow(
            int hwnd
        );

        [DllImport("user32.dll", EntryPoint = "GetClassName")]
        public static extern int GetClassName(
            IntPtr hwnd,
            StringBuilder lpClassName,
            int nMaxCount
        );
        [DllImport("user32.dll", EntryPoint = "GetWindowText")]
        public static extern int GetWindowText(
            IntPtr hwnd,
            StringBuilder lpString,
            int cch
        );

        #endregion


        //综合处理全局HWD

        private static int CurrnetFormHandle = 0;
        //综合处理函数


        public static void SetCurrnetFormHandle(string strWindow)
        {
            SetCurrnetFormHandle(null, strWindow, false);
        }
        public static void SetCurrnetFormHandle(string strClass, string strWindow, bool beForeground)
        {
            CurrnetFormHandle = FindWindow(strClass, strWindow);
            if (beForeground)
                SetForegroundWindow(CurrnetFormHandle);
        }
        public static void SetCurrnetFormHandle(int hwd, bool beForeground)
        {
            CurrnetFormHandle = hwd;
            if (beForeground)
                SetForegroundWindow(CurrnetFormHandle);
        }

        public static void SetCurrnetFormHandle(int hwd)
        {
            CurrnetFormHandle = hwd;
        }
        public static int GetCurrentFormHandle()
        {
            return CurrnetFormHandle;
        }

        //模拟单击按钮

        public static void ClickButton(string strWindow)
        {
            ClickButton("Button", strWindow);
        }

        public static void ClickButton(string strClass, string strWindow)
        {
            ClickButton(CurrnetFormHandle, 0, strClass, strWindow);
        }

        public static void ClickButton(int hwdParent, int hwndChildAfter, string strClass, string strWindow)
        {
            int hwdButton = FindWindowEx(hwdParent, hwndChildAfter, strClass, strWindow);
            SendMessage(hwdButton, WM_LBUTTONDOWN, 0, 0);
            SendMessage(hwdButton, WM_LBUTTONUP, 0, 0);
        }

        //修改文本框内容

        public static void SetWindowsText(string Parnet_strClass, string Parnet_strText, string strClass, string strText)
        {
            int hwdParent = FindWindowEx(CurrnetFormHandle, 0, Parnet_strClass, Parnet_strText);

            //停止 ThunderRT6OptionButton

            int bntHwd = FindWindowEx(hwdParent, 0, "ThunderRT6OptionButton", "停止");

            int hwdText = FindWindowEx(hwdParent, bntHwd, strClass, null);  //ThunderRT6TextBox

            SendTxtMessage(hwdText, WM_SETTEXT, 0, strText.ToCharArray());
        }
        public static void SetWindowsText(string strClass, string strText)
        {
            SetWindowsText(strClass, null, strText);
        }
        public static void SetWindowsText(string strClass, string strWindow, string strText)
        {
            SetWindowsText(CurrnetFormHandle, 0, strClass, strWindow, strText);
        }
        public static void SetWindowsText(int hwdParent, int hwndChildAfter, string strClass, string strWindow, string strText)
        {
            int hwdText = FindWindowEx(hwdParent, hwndChildAfter, strClass, strText);
            SendTxtMessage(hwdText, WM_SETTEXT, 0, strText.ToCharArray());
        }

        //搜索子窗体

        public static void SearchChild(string strWindow)
        {
            EnumChildWindowsProc myEnumChild = new EnumChildWindowsProc(EumWinChiPro);
            try
            {
                EnumChildWindows(CurrnetFormHandle, myEnumChild, 0);
            }
            catch (Exception ex)
            {
                ;   // MessageBox.Show(ex.Message + "\r\n" + ex.Source + "\r\n\r\n" + ex.StackTrace.ToString());

            }

        }

        public static bool EumWinChiPro(IntPtr hWnd, int lParam)
        {
            StringBuilder s = new StringBuilder(1256);
            GetClassName(hWnd, s, 1257);
            string ss = s.ToString();
            if (ss == null)
                ss = "";
            ss = ss.Trim();
            //        MessageBox.Show(ss);

            // ThunderRT6TextBox


            StringBuilder s2 = new StringBuilder(1256);
            GetWindowText(hWnd, s2, 1257);
            ss = s2.ToString();
            return true;
        }
    }
}

使用这个类，在自己的程序中，比较方便地实现外部程序的调用。

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int hwnd = (int) MainHandlArray[i];
WinApi.SetCurrnetFormHandle(hwnd);
WinApi.SetWindowsText(textBox_Class_EditPanel.Text, 
    textBox_Title_EditPanel.ToString(), textBox_Class_Edit.Text, textBoxWorkID.Text);

使用这种方法，我写个程序多开器，主要实现启动多个实例，能给EDIT框付值，能定时调用其中按钮。



多开程序下载
https://files.cnblogs.com/yuanbao/mulicall.rar