将键代码转换为char/string

本文关键字：char string 转换 代码 | 更新日期: 2023-09-27 17:59:04

我正在尝试使用将System.Windows.Forms.Keys转换为字符串/字符

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

但它为"."返回"OemPeriod"，为"，"返回"Oemcomma"。有什么方法可以得到确切的字符吗？

将键代码转换为char/string

您试图实现的目标绝非易事。窗口（例如）使用键盘映射（键盘布局）将键盘键转换为实际字符。以下是我实现这一目标的方法：


    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);

这可能是您真正想要的（有点晚了，但希望这能帮助其他人），将键代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
);

如果你只想忽略移位修饰符，那么就用这个

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

现在只需致电charPressed.ToString()即可获取您的钥匙。

如果你想要shift修饰符，你可以使用这样的东西来简化

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();
}

由于问题标签中有"控制台应用程序"，请尝试此

     ConsoleKeyInfo input = Console.ReadKey(true);
     StringBuilder output = new StringBuilder(
                   String.Format("You pressed {0}", input.KeyChar));
     Console.WriteLine(output.ToString());

这些是键盘上逗号和句点键的正确名称和预期名称。您可以从文档中清楚地看到这一点。KeysConverter类的行为符合预期和设计。

如果你想为这些密钥想出一个不同的名称，你可以检测它们并替换你想要使用的名称。例如：

string name;
switch (e.KeyCode)
{
    case Keys.Oemcomma:
        name = "Comma";
        break;
    case Keys.OemPeriod:
        name = "Period";
        break;
    default:
        name = (new KeysConverter()).ConvertToString(e.KeyCode);
        break;
}
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