C#通过托管调用Win32 api获取键盘状态

最新推荐文章于 2023-11-17 09:06:40 发布

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本文介绍了一个C#程序，用于检测当前键盘上特定按键的状态，包括按键是否被按下或切换。程序使用了DllImport导入user32.dll中的GetKeyState函数，并定义了枚举KeyStates来表示按键的不同状态。

代码如下：

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace MouseKeyboardStateTest
{
  public abstract class Keyboard
  {
    [Flags]
    private enum KeyStates
    {
      None = 0,
      Down = 1,
      Toggled = 2
    }

    [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
    private static extern short GetKeyState(int keyCode);

    private static KeyStates GetKeyState(Keys key)
    {
      KeyStates state = KeyStates.None;

      short retVal = GetKeyState((int)key);

      //If the high-order bit is 1, the key is down
      //otherwise, it is up.
      if ((retVal & 0x8000) == 0x8000)
        state |= KeyStates.Down;

      //If the low-order bit is 1, the key is toggled.
      if ((retVal & 1) == 1)
        state |= KeyStates.Toggled;

      return state;
    }

    public static bool IsKeyDown(Keys key)
    { 
      return KeyStates.Down == (GetKeyState(key) & KeyStates.Down);
    }

    public static bool IsKeyToggled(Keys key)
    { 
      return KeyStates.Toggled == (GetKeyState(key) & KeyStates.Toggled);
    }
  }
}

原文地址http://stackoverflow.com/questions/1100285/how-to-detect-the-currently-pressed-key