答えは、必要な文字の逆ルックアップテーブルを作成することです。コードはさらに最適化できますが、それは自明です。必要に応じて、特別な文字を明示的に追加できます。
また、辞書を作成して逆の方向に進むこともできます。マルチキー文字には簡単な拡張子が必要ですが、とにかくキーに直接マップされません。あなたがそれを必要とするならばあなたの熟読と可能な拡張のために:
using System.Windows.Forms;
static ImmutableDictionary<char, Keys> CharVKeyLookup;
static void PopulateVKeyCharDictionary(){
var keyboardStateNormal = new byte[255]; //All keys up
var keyboardStateShift = new byte[255];
keyboardStateShift[(int)Keys.ShiftKey] = 0x80;
var charlookup = new Dictionary<char, Keys>();
for (var i = 1; i < (int) Keys.OemClear; i++){
var keys = (Keys) i;
//Verbose condition to ignore unnecessary conversions - probably a quicker way e.g. statically
if (keys == Keys.Enter || keys == Keys.Tab || keys == Keys.Space
|| (keys >= Keys.D0 && keys <= Keys.D9)
|| (keys >= Keys.A && keys <= Keys.Z)
|| (keys >= Keys.Multiply && keys <= Keys.Divide)
|| (keys >= Keys.Oem1 && keys <= Keys.Oem102)){
var normal = KeyCodeToUnicode(keys);
var shift = KeyCodeToUnicode(keys, true);
if (normal.Item2 == 1) //Ignore wierdos - extend this if you need it
charlookup[normal.Item1[0]]=keys;
if (shift.Item2 ==1)
charlookup[shift.Item1[0]]=keys|Keys.Shift; //Incl shift mod
}
}
charlookup['\n'] = Keys.Return;
charlookup['\r'] = Keys.Return;
CharVKeyLookup = charlookup.ToImmutableDictionary();
}
/// <returns>string if it exists and return code. -1=dead char, 0=no translation, 1=1 char, 2=special char </returns>
public static Tuple<string, int> KeyCodeToUnicode(Keys key, byte[] keyboardState){
var scanCode = MapVKToScanCode(key);
var result = new StringBuilder(10,10);
var language = InputLanguage.CurrentInputLanguage.Handle;//Or other method such as GetKeyboardLayout
var returnState = ToUnicodeEx(key, scanCode, keyboardState, result, 10, 0, language);
return new Tuple<string, int>(result.ToString(),returnState);
}
[DllImport("user32.dll")]
internal static extern int ToUnicodeEx(Keys wVirtKey, uint wScanCode, byte[] lpKeyState, [Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder pwszBuff, int cchBuff, uint wFlags, IntPtr dwhkl);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
internal static extern IntPtr GetKeyboardLayout(int dwLayout);