Thread: Sending Ctrl+letter to application using PostMesssage or SendMessage

  1. #1
    Registered User
    Join Date
    Mar 2009

    Sending Ctrl+letter to application using PostMesssage or SendMessage


    I've been trying to send Ctrl+s to notepad, but havent succesfully manage to do this. I've googled it, but havent found anyone who have sent a ctrl+letter command to a process.

    Currently, the sending part of my code look like this:
    IntPtr hWnd = FindWindow("Notepad", null); 
    IntPtr hWndChild = FindWindowEx(hWnd, IntPtr.Zero, "Edit", null); 
    int VK_CONTROL = (int)0x11;
    uint wm_keydown = (uint)0x100; 
    uint wm_char = (uint)0x102; 
    uint wm_keyup = (uint)0x101; 
    PostMessage(hWndChild, wm_keydown, VK_CONTROL, 0);       //Send Ctrl down 
    PostMessage(hWndChild, wm_keydown, VkKeyScan('s'), 0);   //Send 's' down 
    PostMessage(hWndChild, wm_keyup, VkKeyScan('s'), 0);     //Send 's' up 
    PostMessage(hWndChild, wm_keyup, VK_CONTROL, 0);         //Send Ctrl up
    I've also tried different values for the lParam parameter (taken from Spy++) and to use hWnd instead of hWndChild, but it does not work. Does anyone know any way to send Ctrl+s to notepad using PostMessage (or SendMessage)? I would really appreciate if anyone could post some sample code. Thank you!

  2. #2
    Registered User khdani's Avatar
    Join Date
    Oct 2007
    reoverload the PostMessage function
            [return: MarshalAs(UnmanagedType.Bool)]
            [DllImport("user32.dll", SetLastError = true)]
            static extern bool PostMessage(HandleRef hWnd, uint Msg, IntPtr wParam, IntPtr 
    and pass the LPARAM and WPARAM as IntPtr.
    use hWnd instead of the later, but i think the name of the window is not
    "Notepad" but "Filename - Notepad" and if it's new instance then it's "Untitled - Notepad"

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