C# winapi mouse_event

Question

        static uint DOWN = 0x0002;
        static uint UP = 0x0004;    
        [DllImport("user32.dll")]
        static extern void mouse_event(uint dwFlags, int dx, int dy, uint dwData, int dwExtraInfo); 
        
        static void Click()
        {
            mouse_event(DOWN, 800, 800, 0, 0);
            Thread.Sleep(100);
            mouse_event(UP, 800, 800, 0, 0);
        }

为什么它不点击我的坐标800 800，它点击我的鼠标在哪里

Answer 1

如果要单击指定的点而不是相对移动，则需要MOUSEEVENTF_ABSOLUTE标志。为了使从当前位置到目标位置的移动，需要MOUSEEVENTF_MOVE标志。

所以代码会是这样的：

    static uint DOWN = 0x0002;
    static uint UP = 0x0004;
    static uint MOUSEEVENTF_ABSOLUTE = 0x8000;
    static uint MOUSEEVENTF_MOVE = 0x0001;
    [DllImport("user32.dll")]
    static extern void mouse_event(uint dwFlags, int dx, int dy, uint dwData, int dwExtraInfo);

    static void Click()
    {
        mouse_event(DOWN | MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_MOVE, 800, 800, 0, 0);
        Thread.Sleep(100);
        mouse_event(UP | MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_MOVE, 800, 800, 0, 0);
    }

并请注意：

如果指定了MOUSEEVENTF_ABSOLUTE值，则dx和dy包含0和65,535之间的归一化绝对坐标。事件过程将这些坐标映射到显示面。将(0,0)映射坐标到显示面的左上角，(65535,65535)映射到右下角.

因此，如果要单击屏幕的指定像素，可以将绝对坐标转换为屏幕像素，如下所示：

    static int SM_CXSCREEN = 0;
    static int SM_CYSCREEN = 1;

    [DllImport("user32.dll")]
    static extern int GetSystemMetrics(int nIndex);

    static void Click()
    {
        int sx = GetSystemMetrics(SM_CXSCREEN);
        int sy = GetSystemMetrics(SM_CYSCREEN);

        int x = 800 * 65536 / sx;
        int y = 800 * 65536 / sy;

        mouse_event(DOWN | MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_MOVE, x, y, 0, 0);
        Thread.Sleep(100);
        mouse_event(UP | MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_MOVE, x, y, 0, 0);
    }

mouse_event 函数已被取代。使用 代替.