C#控制键盘按键的常用方法

 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); } } }