Unable to detected visibility of Onscreen keyboard using user32.dll

Question

Below code is always showing on screen keyboard as visible. Even if it is closed.

using System;
using System.Diagnostics;
using Microsoft.Win32;
using System.Runtime.InteropServices;
using System.Threading;

namespace CSharpTesting
{
    class Program
    {
        /// <summary>
        /// The window is disabled. See http://msdn.microsoft.com/en-gb/library/windows/desktop/ms632600(v=vs.85).aspx.
        /// </summary>
        public const UInt32 WS_DISABLED = 0x8000000;

        /// <summary>
        /// Specifies we wish to retrieve window styles.
        /// </summary>
        public const int GWL_STYLE = -16;

        [DllImport("user32.dll")]
        public static extern IntPtr FindWindow(String sClassName, String sAppName);

        [DllImport("user32.dll", SetLastError = true)]
        static extern UInt32 GetWindowLong(IntPtr hWnd, int nIndex);

        static void Main(string[] args)
        {
            // Crappy loop to poll window state.
            while (true)
            {
                if (IsKeyboardVisible())
                {
                    Console.WriteLine("keyboard is visible");
                }
                else
                {
                    Console.WriteLine("keyboard is NOT visible");
                }

                Thread.Sleep(1000);
            }
        }

        /// <summary>
        /// Gets the window handler for the virtual keyboard.
        /// </summary>
        /// <returns>The handle.</returns>
        public static IntPtr GetKeyboardWindowHandle()
        {
            return FindWindow("IPTip_Main_Window", null);
        }

        /// <summary>
        /// Checks to see if the virtual keyboard is visible.
        /// </summary>
        /// <returns>True if visible.</returns>
        public static bool IsKeyboardVisible()
        {
            IntPtr keyboardHandle = GetKeyboardWindowHandle();

            bool visible = false;

            if (keyboardHandle != IntPtr.Zero)
            {
                UInt32 style = GetWindowLong(keyboardHandle, GWL_STYLE);
                visible = ((style & WS_DISABLED) != WS_DISABLED);
            }

            return visible;
        }
    }
}

Answer 1

If you're talking about OSK (Win + Ctrl + O), the class of the window is "OSKMainClass"

(and to test if a window is visible is WS_VISIBLE style or IsWindowVisible, but when I close it on Windows 10, the window is destroyed)

Answer 2

Hi,

You can use the solution :
https://stackoverflow.com/a/24499623

It works for me on Win11 24h2
C++:

#include <windows.h>
#include<shobjidl_core.h>
BOOL __cdecl IsVirtualKeyboardVisible()
{
    BOOL    bRet = FALSE;
    RECT    InputPaneScreenLocation = { 0, 0, 0, 0 };

    __try
    {
        HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);

        IFrameworkInputPane *IinputPane = NULL;

        if (SUCCEEDED(hr))
        {
            //
            // http://msdn.microsoft.com/en-us/library/windows/desktop/hh706967(v=vs.85).aspx
            //
            hr = CoCreateInstance(__uuidof(FrameworkInputPane), 0, CLSCTX_ALL, __uuidof(IFrameworkInputPane), (LPVOID*)&IinputPane);
            IinputPane->Location(&InputPaneScreenLocation);

            if (InputPaneScreenLocation.bottom == 0 && InputPaneScreenLocation.left == 0 &&
                InputPaneScreenLocation.right == 0 && InputPaneScreenLocation.top == 0)
            {
                // VKB is not visible
                bRet = FALSE;
            }
            else
            {
                // VKB is visible
                bRet = TRUE;
            } 
        }

    }   // try
    __finally
    {
        CoUninitialize();
    }

    return bRet;
}

Best regards,

Minxin Yu

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