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);          }        }  }