How to know if the keyboard is active on a text input

Question

I have an application that acts like an on screen keyboard, I need it to know if there is a keyboard cursor (caret) active any where, so the keyboard will set to active.

Answer 1

It is easy by searching for the caret position, since it should be larger than 0

    GUITHREADINFO lpgui = new GUITHREADINFO();
    IntPtr fore = GetForegroundWindow();
    uint tpid = GetWindowThreadProcessId(fore, IntPtr.Zero);
    lpgui.cbSize = Marshal.SizeOf(lpgui.GetType());
    bool flag = GetGUIThreadInfo(tpid, out lpgui);
    WINDOWINFO pwi = new WINDOWINFO();
    pwi.cbSize = (uint)Marshal.SizeOf(pwi.GetType());
    GetWindowInfo((IntPtr)lpgui.hwndCaret, ref pwi);

    if (flag)
    {
        if (!(lpgui.rcCaret.Location.X == 0 && lpgui.rcCaret.Location.Y == 0))
        {


            //TODO

        }
    }