c# - SendMessage send shortcut

Question

Hi
I have an opened RDP instance, and I need to send "Win + Left arrow key" using the SendMessage method:

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

Assuming, I have the MainWindowHandle object of the RDP instance... I'm not sure which values I need to set in order send the above shortcut.
Can you please assist?

Best Regards,
Nadeem Bader

Answer 1

You can use keybd_event

For example (remove the space at Sl eep (editor bug...):

IntPtr hWnd = FindWindow("TscShellContainerClass", null);
if (hWnd != IntPtr.Zero)
{
    ShowWindow(hWnd, SW_SHOWNORMAL);
    SwitchToThisWindow(hWnd, true);
    System.Threading.Thread.Sl eep(200);
    keybd_event(VK_LWIN, 0, KEYEVENTF_EXTENDEDKEY, 0);
    keybd_event(VK_LEFT, 0, 0, 0);
    keybd_event(VK_LEFT, 0, KEYEVENTF_KEYUP, 0);
    keybd_event(VK_LWIN, 0, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
}

Declarations :

        [DllImport("User32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("User32.dll", SetLastError = true)]
        public static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, int dwExtraInfo);

        public const int KEYEVENTF_EXTENDEDKEY = 0x0001;
        public const int KEYEVENTF_KEYUP = 0x0002;
        public const int KEYEVENTF_UNICODE = 0x0004;
        public const int KEYEVENTF_SCANCODE = 0x0008;

        public const int VK_LWIN = 0x5B;
        public const int VK_LEFT = 0x25;
        public const int VK_UP = 0x26;
        public const int VK_RIGHT = 0x27;
        public const int VK_DOWN = 0x28;

        [DllImport("User32.dll", SetLastError = true)]
        public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

        public const int SW_HIDE = 0;
        public const int SW_SHOWNORMAL = 1;
        public const int SW_SHOWMINIMIZED = 2;
        public const int SW_SHOWMAXIMIZED = 3;
        public const int SW_RESTORE = 9;

        [DllImport("User32.dll", SetLastError = true)]
        public static extern bool SwitchToThisWindow(IntPtr hWnd, bool fAltTab);

Answer 2

Hi

Thank you for reply.
The idea is restore the mstsc window which is in full screen.
Seems that the shortcut "Win + Left arrow key" works only after the mstsc window is restored.

Can you please send me the code which restores the mstsc window using shortcuts?
Note: I tried the "ShowWindow(hWnd, 9);", but that doesn't work since the mstsc is in full screen.

Best Regards,
Nadeem Bader