Send mouse clicks to X Y coordinate of another application

Question

I am trying to send a simulated mouse click to another application. I understand how to actually send the key click, this is not the issue. I need to send the mouse click to the

Answer 1

You can use the GetWindowInfo API:

    [return: MarshalAs(UnmanagedType.Bool)]
    [DllImport("user32.dll", SetLastError = true)]
    private static extern bool GetWindowInfo(IntPtr hwnd, ref WINDOWINFO pwi);

    [StructLayout(LayoutKind.Sequential)]
    struct WINDOWINFO
    {
        public uint cbSize;
        public RECT rcWindow;
        public RECT rcClient;
        public uint dwStyle;
        public uint dwExStyle;
        public uint dwWindowStatus;
        public uint cxWindowBorders;
        public uint cyWindowBorders;
        public ushort atomWindowType;
        public ushort wCreatorVersion;

        public WINDOWINFO(Boolean? filler)
            : this()   // Allows automatic initialization of "cbSize" with "new WINDOWINFO(null/true/false)".
        {
            cbSize = (UInt32)(Marshal.SizeOf(typeof(WINDOWINFO)));
        }

    }
    [StructLayout(LayoutKind.Sequential)]
    struct RECT
    {
        public int left, top, right, bottom;
    }


    private void button1_Click_1(object sender, EventArgs e)
    {
        var p = System.Diagnostics.Process.GetProcessesByName("mspaint");

        if (p.Length == 0) return;

        WINDOWINFO wi = new WINDOWINFO(false);
        GetWindowInfo(p[0].MainWindowHandle, ref wi);

        SendLeftClick((wi.rcWindow.left + wi.rcWindow.right) / 2, (wi.rcWindow.top + wi.rcWindow.bottom) / 2);
    }