Simulating a mouse button click in Windows

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遥遥无期
遥遥无期 2020-12-17 06:38

I\'m writing Remote Desktop clone in C++ using QT. So far I\'m able to move the mouse cursor around fine. QT has a nice setPos function for that. However, I\'m a bit lost as

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  • 2020-12-17 07:17

    This is in C#, but might help you to get an idea:

    [DllImport("user32.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
       public static extern void mouse_event(long dwFlags, long dx, long dy, long cButtons, long dwExtraInfo);
    
       private const int MOUSEEVENTF_LEFTDOWN = 0x02;
       private const int MOUSEEVENTF_LEFTUP = 0x04;
       private const int MOUSEEVENTF_RIGHTDOWN = 0x08;
       private const int MOUSEEVENTF_RIGHTUP = 0x10;
    
       public void DoMouseClick()
       {
          int X = Cursor.Position.X;
          int Y = Cursor.Position.Y;
          mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, X, Y, 0, 0);
       }
    

    Resources which might help:

    http://msdn.microsoft.com/en-us/library/ms646260%28VS.85%29.aspx

    http://www.codeguru.com/Cpp/W-P/win32/article.php/c4543/

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  • 2020-12-17 07:26

    Lukas Šalkauskas' solution has worked for me for quite some time, but today it suddenly resulted in the following error (perhaps due to some .NET update by Windows Update?)

    A call to PInvoke function 'SampleMethod' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.

    So I switched to the pinvoke.net sample code and it works well now:

    [DllImport("user32.dll")]
    static extern void mouse_event(int dwFlags, int dx, int dy, int dwData, int dwExtraInfo);
    
    [Flags]
    public enum MouseEventFlags
    {
        LEFTDOWN = 0x00000002,
        LEFTUP = 0x00000004,
        MIDDLEDOWN = 0x00000020,
        MIDDLEUP = 0x00000040,
        MOVE = 0x00000001,
        ABSOLUTE = 0x00008000,
        RIGHTDOWN = 0x00000008,
        RIGHTUP = 0x00000010
    }
    
    public static void LeftClick(int x, int y)
    {
        Cursor.Position = new System.Drawing.Point(x, y);
        mouse_event((int)(MouseEventFlags.LEFTDOWN), 0, 0, 0, 0);
        mouse_event((int)(MouseEventFlags.LEFTUP), 0, 0, 0, 0);
    }
    
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  • 2020-12-17 07:34

    Combining all togegher, here is the code for Qt:

    #include <windows.h>
    QApplication::desktop()->cursor().setPos(globalX,globalY);
    mouse_event(MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, 1, 1, 0, 0);
    
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