C# mouse_event / 模拟鼠标事件

想必有很多人在项目开发中可能遇见需要做模拟鼠标点击的小功能，很多人会在

百度过后采用mouse_event这个函数，不过我并不想讨论如何去使用mouse_event

函数怎么去使用，因为那没有多大意义。

        static void mouse_event(int dwFlags, int dx, int dy, int cButtons, int dwExtraInfo)
        {
            int x = dx, y = dy;
            edit_position(dwFlags, dx, dy, ref x, ref y); 
            IntPtr hWndFromPoint = WindowFromPoint(x, y);
            screen_to_client(hWndFromPoint, ref x, ref y); 
            send_message(hWndFromPoint, dwFlags, cButtons, x, y);
        }

上述代码你发现了什么？如果你发现说明你知道了本文到底在写什么东东 说不定你

会有一些兴趣看下去，不过想到我如今混那么凄惨 在工地上做干活 不过也还好。

鼠标点击目标时会向鼠标所点击目标窗口投递消息，根据鼠标的按键、状态不同会

投递不同的消息，一个完整的“鼠标左键单击”事件过程为“WM_LBUTTONDOWN + 

WM_LBUTTONUP”即鼠标“先左键按下 + 后左键抬起”，由于mouse_event可以模拟

鼠标点击过程而不是直接性一次完整的鼠标单击过程，所以同样存在“按下、抬起”

mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP | MOUSEEVENTF_MOVE, -450, 0, 1, 0);

mouse_event在没有提供MOUSEEVENTF_MOVE量时光标不会移动到相对位置，

“光标相对位置=光标现行位置+新光标位置”如果提供量“MOUSEEVENTF_ABSOLUTE”

绝对位置，则会以“新光标位置”为准而不会添加“光标现行位置”

        static void edit_position(int dwFlags, int dx, int dy, ref int x, ref int y)
        {
            Point pos = MousePosition;
            x = x + pos.X;
            y = y + pos.Y;
            if ((dwFlags | MOUSEEVENTF_ABSOLUTE) == dwFlags)
                SetCursorPos(dx, dy);
            if ((dwFlags | MOUSEEVENTF_MOVE) == dwFlags)
                SetCursorPos(x, y);
        }

edit_position函数主要用于对MOUSEEVENTF_MOVE于MOUSEEVENTF_ABSOLUTE

相对/绝对光标位置修改的一个支持

        static void send_message(IntPtr hWnd, int dwFlags, int cButtons, int x, int y)
        {
            if ((dwFlags | MOUSEEVENTF_LEFTDOWN) == dwFlags)
                SendMessage(hWnd, WM_LBUTTONDOWN, cButtons, MakeDWord(x, y));
            if ((dwFlags | MOUSEEVENTF_LEFTUP) == dwFlags)
                SendMessage(hWnd, WM_LBUTTONUP, cButtons, MakeDWord(x, y));
            if ((dwFlags | MOUSEEVENTF_RIGHTDOWN) == dwFlags)
                SendMessage(hWnd, WM_RBUTTONDOWN, cButtons, MakeDWord(x, y));
            if ((dwFlags | MOUSEEVENTF_RIGHTUP) == dwFlags)
                SendMessage(hWnd, WM_RBUTTONUP, cButtons, MakeDWord(x, y));
            if ((dwFlags | MOUSEEVENTF_MIDDLEDOWN) == dwFlags)
                SendMessage(hWnd, WM_MBUTTONDOWN, cButtons, MakeDWord(x, y));
            if ((dwFlags | MOUSEEVENTF_MIDDLEUP) == dwFlags)
                SendMessage(hWnd, WM_MBUTTONUP, cButtons, MakeDWord(x, y));
        }

send_message函数主要用于模拟鼠标点击的过程，上面我提到“先左键按下 + 后左键抬起”

在上面的代码中你会看的清楚的不得了，如果相反你可以去尝试一番会有什么后果 与其说

不如你们自己做更要来的快些。

        static int MakeDWord(int low, int high)
        {
            return low + (high * Abs(~ushort.MaxValue));
        }

        static int Abs(int value)
        {
            return ((value >> 31) ^ value) - (value >> 31);
        }

MakeDWord / 合并整数，函数主要是把两个short合并为一个int，分为low、high两部分

        static bool screen_to_client(IntPtr hwnd, ref int x, ref int y)
        {
            bool bRetVal = false;
            Point lpptPos = new Point(x, y);
            if ((bRetVal = ScreenToClient(hwnd, ref lpptPos)))
            {
                x = lpptPos.X;
                y = lpptPos.Y;
            }
            return bRetVal;
        }

screen_to_client函数故名思意，它主要用于把屏幕上的坐标转换到窗口客户上对应坐标

        public const int WM_LBUTTONDOWN = 513; // 鼠标左键按下
        public const int WM_LBUTTONUP = 514; // 鼠标左键抬起
        public const int WM_RBUTTONDOWN = 516; // 鼠标右键按下
        public const int WM_RBUTTONUP = 517; // 鼠标右键抬起
        public const int WM_MBUTTONDOWN = 519; // 鼠标中键按下
        public const int WM_MBUTTONUP = 520; // 鼠标中键抬起

        public const int MOUSEEVENTF_MOVE = 0x0001; // 移动鼠标       
        public const int MOUSEEVENTF_LEFTDOWN = 0x0002; // 鼠标左键按下      
        public const int MOUSEEVENTF_LEFTUP = 0x0004; // 鼠标左键抬起      
        public const int MOUSEEVENTF_RIGHTDOWN = 0x0008; // 鼠标右键按下     
        public const int MOUSEEVENTF_RIGHTUP = 0x0010; // 鼠标右键抬起        
        public const int MOUSEEVENTF_MIDDLEDOWN = 0x0020; // 鼠标中键按下  
        public const int MOUSEEVENTF_MIDDLEUP = 0x0040; // 鼠标中键抬起         
        public const int MOUSEEVENTF_ABSOLUTE = 0x8000; // 绝对坐标 

        [DllImport("user32.dll", SetLastError = true)]
        public static extern int SendMessage(IntPtr hWnd, int uMsg, int wParam, int lParam);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern IntPtr WindowFromPoint(int xPoint, int yPoint);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern int SetCursorPos(int x, int y);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool ScreenToClient(IntPtr hWnd, ref Point lppt);

        // [DllImport("user32", SetLastError = true)]
        // public static extern int mouse_event(int dwFlags, int dx, int dy, int cButtons, int dwExtraInfo);

鼠标右键单击(静默)：

mouse_event(MOUSEEVENTF_RIGHTDOWN | MOUSEEVENTF_RIGHTUP, 0, 0, 1, 0);

鼠标左键双击(静默):

mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, 0, 0, 2, 0);

鼠标移动(相对位置):

mouse_event(MOUSEEVENTF_MOVE, 100, 50, 0, 0);

鼠标移动(绝对位置):

mouse_event(MOUSEEVENTF_ABSOLUTE, 100, 50, 0, 0);

好了就这么多吧，现在浑身头晕脑涨的 话说多了反倒不好 自己从代码中 领悟才是真