将keycode转换为char/string

Question

我正在尝试System.Windows.Forms.Keys使用以下方法转换为字符串/ char:

KeysConverter converter = new KeysConverter();
string text = converter.ConvertToString(keyCode);
Console.WriteLine(text);

但它返回"OemPeriod"为"." 和"Oemcomma"代表",".有没有办法得到确切的角色？

Answer 1

这可能是你真正想要的(有点迟了,但希望这会帮助其他人),将键码直接转换为键打印的字符.

首先将此指令添加到您的类中:

[DllImport("user32.dll", CharSet = CharSet.Unicode)]
public static extern int ToUnicode(
    uint virtualKeyCode, 
    uint scanCode,
    byte[] keyboardState,
    StringBuilder receivingBuffer, 
    int bufferSize, 
    uint flags
);

如果您只想忽略shift修改器,请使用此选项

StringBuilder charPressed = new StringBuilder(256);
ToUnicode((uint)keyCode, 0, new byte[256], charPressed, charPressed.Capacity, 0);

现在只需打电话charPressed.ToString()来获取密钥.

如果你想要移位修改器,你可以使用这样的东西来使它更容易

static string GetCharsFromKeys(Keys keys, bool shift)    
{
    var buf = new StringBuilder(256);
    var keyboardState = new byte[256];
    if (shift)
    {
        keyboardState[(int)Keys.ShiftKey] = 0xff;
    }
        ToUnicode((uint)keys, 0, keyboardState, buf, 256, 0);
        return buf.ToString();
}

Answer 2

无论如何，您要尝试实现的目标都不是简单的任务。Windows（例如）使用键盘映射（键盘布局）将键盘按键转换为实际字符。这是我如何实现此目标的方法：

    public string KeyCodeToUnicode(Keys key)
    {
        byte[] keyboardState = new byte[255];
        bool keyboardStateStatus = GetKeyboardState(keyboardState);

        if (!keyboardStateStatus)
        {
            return "";
        }

        uint virtualKeyCode = (uint)key;
        uint scanCode = MapVirtualKey(virtualKeyCode, 0);
        IntPtr inputLocaleIdentifier = GetKeyboardLayout(0);

        StringBuilder result = new StringBuilder();
        ToUnicodeEx(virtualKeyCode, scanCode, keyboardState, result, (int)5, (uint)0, inputLocaleIdentifier);

        return result.ToString();
    }

    [DllImport("user32.dll")]
    static extern bool GetKeyboardState(byte[] lpKeyState);

    [DllImport("user32.dll")]
    static extern uint MapVirtualKey(uint uCode, uint uMapType);

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

    [DllImport("user32.dll")]
    static extern int ToUnicodeEx(uint wVirtKey, uint wScanCode, byte[] lpKeyState, [Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder pwszBuff, int cchBuff, uint wFlags, IntPtr dwhkl);