C#控制键盘按键的常用方法

最新推荐文章于 2024-09-24 09:29:16 发布

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本文介绍了一个使用 C# 编写的简单应用程序，该程序能够控制键盘上的 Caps Lock、Scroll Lock 和 Num Lock 键的状态。通过调用 Windows API 函数 GetKeyState 和 keybd_event，实现了对这些特殊按键的开关操作。

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using 
System;
using 
System.Collections.Generic;
using 
System.ComponentModel;
using 
System.Data;
using 
System.Drawing;
using 
System.Text;
using 
System.Windows.Forms;
using 
System.Runtime.InteropServices;
namespace
sn设置键盘大小写
{
  public
partial class
Form1 : Form
  {
    const
uint KEYEVENTF_EXTENDEDKEY = 0x1;
    const
uint KEYEVENTF_KEYUP = 0x2;
    [DllImport("user32.dll")]
    static
extern short
GetKeyState(int
nVirtKey);
    [DllImport("user32.dll")]
    static
extern void
keybd_event(byte
bVk, byte 
bScan, uint 
dwFlags, uint 
dwExtraInfo);
    public
enum VirtualKeys :
byte
    {
      VK_NUMLOCK = 0x90,
//数字锁定键
      VK_SCROLL = 0x91,
//滚动锁定
      VK_CAPITAL = 0x14,
//大小写锁定
      VK_A = 62
    }
    public
Form1()
    {
      InitializeComponent();
    }
    public
static bool
GetState(VirtualKeys Key)
    {
      return
(GetKeyState((int)Key)==1);
    }
    public
static void
SetState(VirtualKeys Key, bool
State)
    {
      if
(State != GetState(Key))
      {
        keybd_event((byte)Key, 0x45, KEYEVENTF_EXTENDEDKEY | 0, 0);
        keybd_event((byte)Key, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
      }
    }
    //开启键盘大写
    private
void btnOpenCAPITAL_Click(object
sender, EventArgs e)
    {
      SetState(VirtualKeys.VK_CAPITAL,
true);
    }
    //关闭键盘大写
    private
void btnCloseCAPITAL_Click(object
sender, EventArgs e)
    {
      SetState(VirtualKeys.VK_CAPITAL,
false);
    }
    //开启键盘滚动锁定
    private
void btnOpenScroll_Click(object
sender, EventArgs e)
    {
      SetState(VirtualKeys.VK_SCROLL,
true);
    }
    //关闭键盘滚动锁定
    private
void btnCloseScroll_Click(object
sender, EventArgs e)
    {
      SetState(VirtualKeys.VK_SCROLL,
false);
    }
    //开启键盘数字锁定键
    private
void btnOpenNum_Click(object
sender, EventArgs e)
    {
      SetState(VirtualKeys.VK_NUMLOCK,
true);
    }
    //关闭键盘数字锁定键
    private
void btnCloseNum_Click(object
sender, EventArgs e)
    {
      SetState(VirtualKeys.VK_NUMLOCK,
false);
    }
  }
}