KeyboardLayoutDetector.cs

using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Text;
using UnityEngine;

public class KeyboardLayoutDetector : MonoBehaviour
{
    private const int KL_NAMELENGTH = 9;

    [DllImport("user32.dll")]
    private static extern IntPtr GetKeyboardLayout(uint idThread);

    [DllImport("user32.dll")]
    private static extern int GetKeyboardLayoutName([Out] StringBuilder pwszKLID);

    private Dictionary<string, string> keyboardLayouts = new Dictionary<string, string>
    {
        { "00000409", "QWERTY" }, // English - United States
        { "00000809", "QWERTY" }, // English - United Kingdom
        { "0000040C", "AZERTY" }, // French - France
        { "0000080C", "AZERTY" }, // Belgian (Period) - Belgium
        { "00000407", "QWERTZ" }, // German - Germany
        { "00000408", "Greek" }, // Greek
        { "0000040E", "Hungarian" }, // Hungarian
        { "0000040A", "Spanish" }, // Spanish - Spain
        { "0000040D", "Hebrew" }, // Hebrew
        { "00000419", "JCUKEN" }, // Russian - Russia
        { "00000411", "Hiragana/Katakana" }, // Japanese - Japan
        { "00000412", "Hangul" }, // Korean - Korea
        { "00000404", "Bopomofo" }, // Chinese (Traditional) - Taiwan     
    };

    void Start() => DetectKeyboardLayout();   

    void DetectKeyboardLayout()
    {
        StringBuilder name = new StringBuilder(KL_NAMELENGTH);
        GetKeyboardLayoutName(name);
        string layoutId = name.ToString();
        Debug.Log("Layout ID: " + layoutId);

        if (keyboardLayouts.TryGetValue(layoutId, out string layoutName))        
            Debug.Log("Keyboard detected : " + layoutName);        
        else        
            Debug.Log("Unrecognized keyboard layout");        
    }

    void OnGUI()
    {
        StringBuilder name = new StringBuilder(KL_NAMELENGTH);
        GetKeyboardLayoutName(name);
        string layoutId = name.ToString();

        string layout = keyboardLayouts.ContainsKey(layoutId) ? keyboardLayouts[layoutId] : "UNKNOWN";
        GUI.Label(new Rect(10, 10, 200, 20), "Keyboard : " + layout);
        GUI.Label(new Rect(10, 30, 200, 20), "Keyboard ID : " + layoutId);
    }
}