VkKeyScan.cs

using System;
using System.Globalization;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;

namespace KeyFinder
{
    class Program
    {
        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        static extern short VkKeyScanEx(char ch, IntPtr dwhkl);

        [DllImport("user32.dll")]
        static extern bool UnloadKeyboardLayout(IntPtr hkl);

        [DllImport("user32.dll")]
        static extern IntPtr LoadKeyboardLayout(string pwszKLID, uint Flags);

        public class KeyboardPointer : IDisposable
        {
            private readonly IntPtr pointer;

            public KeyboardPointer(int klid)
            {
                pointer = LoadKeyboardLayout(klid.ToString("X8"), 1);
            }

            public KeyboardPointer(CultureInfo culture)
                : this(culture.KeyboardLayoutId)
            {
            }

            public void Dispose()
            {
                UnloadKeyboardLayout(pointer);
                GC.SuppressFinalize(this);
            }

            ~KeyboardPointer()
            {
                UnloadKeyboardLayout(pointer);
            }

            // Converting to System.Windows.Forms.Key here, but
            // some other enumerations for similar tasks have the same
            // one-to-one mapping to the underlying Windows API values
            public bool GetKey(char character, out Keys key)
            {
                short keyNumber = VkKeyScanEx(character, pointer);
                if (keyNumber == -1)
                {
                    key = System.Windows.Forms.Keys.None;
                    return false;
                }

                key = (System.Windows.Forms.Keys) (((keyNumber & 0xFF00) << 8) | (keyNumber & 0xFF));
                return true;
            }
        }

        private static string DescribeKey(Keys key)
        {
            StringBuilder desc = new StringBuilder();
            if ((key & Keys.Shift) != Keys.None)
                desc.Append("Shift: ");
            if ((key & Keys.Control) != Keys.None)
                desc.Append("Control: ");
            if ((key & Keys.Alt) != Keys.None)
                desc.Append("Alt: ");
            return desc.Append(key & Keys.KeyCode).ToString();
        }

        public static void Main(string[] args)
        {
            var testChars = new[]
            {
                '@', 
                '"', 
//                'A', 
//                'é', 
//                'ש'
            };
            Keys key;
            foreach (var culture in (new string[]
            {
                "en-US",
//                "en-IE",
                "en-UK"
            }).Select(code =>
                CultureInfo.GetCultureInfo(code)))
            {
                Console.WriteLine(culture.Name);
                using (var keyboard = new KeyboardPointer(culture))
                    foreach (var test in testChars)
                    {
                        Console.Write(test);
                        Console.Write('\t');
                        if (keyboard.GetKey(test, out key))
                            Console.WriteLine(DescribeKey(key));
                        else
                            Console.WriteLine("No Key");
                    }
            }

            Console.Read(); //Stop window closing
        }
    }
}