C#使用钩子获得按键信息的方法

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Runtime.InteropServices;using System.Threading;using ReadBadCode;namespace gouzi{ public partial class Form2 : Form {  BarCodeHook BarCode = new BarCodeHook();  public Form2()  {   InitializeComponent();   BarCode.BarCodeEvent += new BarCodeHook.BarCodeDelegate(BarCode_BarCodeEvent);  }  private delegate void ShowInfoDelegate(BarCodeHook.BarCodes barCode);  private void ShowInfo(BarCodeHook.BarCodes barCode)  {   if (this.InvokeRequired)   {    this.BeginInvoke(new ShowInfoDelegate(ShowInfo), new object[] { barCode });   }   else   {    textBox1.Text = barCode.KeyName;//键名    textBox2.Text = barCode.VirtKey.ToString();//虚拟码    textBox3.Text = barCode.ScanCode.ToString();//扫描码    textBox4.Text = barCode.AscII.ToString();//AscII    textBox5.Text = barCode.Chr.ToString();//字符    textBox6.Text = barCode.IsValid ? barCode.BarCode : "";    //在这里进行键入值   }  }  void BarCode_BarCodeEvent(BarCodeHook.BarCodes barCode)  {   ShowInfo(barCode);  }  private void Form2_Load(object sender, EventArgs e)  {   BarCode.Start();  }  private void Form2_StyleChanged(object sender, EventArgs e)  {   BarCode.Stop();  } }}

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Runtime.InteropServices;using System.Reflection;namespace ReadBadCode{ class BarCodeHook {  public delegate void BarCodeDelegate(BarCodes barCode);  public event BarCodeDelegate BarCodeEvent;  public struct BarCodes  {   public int VirtKey;  //虚拟码    public int ScanCode;  //扫描码    public string KeyName; //键名    public uint AscII;  //AscII    public char Chr;   //字符   public string BarCode; //条码信息    public bool IsValid;  //条码是否有效    public DateTime Time; //扫描时间   }  private struct EventMsg  {   public int message;   public int paramL;   public int paramH;   public int Time;   public int hwnd;  }  // 安装钩子   [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]  private static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);  // 卸载钩子  [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]  private static extern bool UnhookWindowsHookEx(int idHook);  // 继续下一个钩子  [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]  private static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);  //获取键名的字符串  [DllImport("user32", EntryPoint = "GetKeyNameText")]  private static extern int GetKeyNameText(int lParam, StringBuilder lpBuffer, int nSize);  //将256个虚拟键复制到指定的缓冲区中  [DllImport("user32", EntryPoint = "GetKeyboardState")]  private static extern int GetKeyboardState(byte[] pbKeyState);  //将指定的虚拟键码和键盘状态为相应的字符串  [DllImport("user32", EntryPoint = "ToAscii")]  private static extern bool ToAscii(int VirtualKey, int ScanCode, byte[] lpKeyState, ref uint lpChar, int uFlags);  //声明定义回调函数  delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);  BarCodes barCode = new BarCodes();  int hKeyboardHook = 0;  string strBarCode = "";  private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)  {   if (nCode == 0)   {    EventMsg msg = (EventMsg)Marshal.PtrToStructure(lParam, typeof(EventMsg));    if (wParam == 0x100) //WM_KEYDOWN = 0x100    {     barCode.VirtKey = msg.message & 0xff; //虚拟码      barCode.ScanCode = msg.paramL & 0xff; //扫描码     StringBuilder strKeyName = new StringBuilder(255);     if (GetKeyNameText(barCode.ScanCode * 65536, strKeyName, 255) > 0)     {      barCode.KeyName = strKeyName.ToString().Trim(new char[] { ' ', '/0' });     }     else     {      barCode.KeyName = "";     }     byte[] kbArray = new byte[256];     uint uKey = 0;     GetKeyboardState(kbArray);     if (ToAscii(barCode.VirtKey, barCode.ScanCode, kbArray, ref uKey, 0))     {      barCode.AscII = uKey;      barCode.Chr = Convert.ToChar(uKey);     }     if (DateTime.Now.Subtract(barCode.Time).TotalMilliseconds > 50)     {      strBarCode = barCode.Chr.ToString();     }     else     {      if ((msg.message & 0xff) == 13 && strBarCode.Length > 3)      //回车      {       barCode.BarCode = strBarCode;       barCode.IsValid = true;      }      strBarCode += barCode.Chr.ToString();     }     barCode.Time = DateTime.Now;     if (BarCodeEvent != null) BarCodeEvent(barCode);     //触发事件      barCode.IsValid = false;    }   }   return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);  }  // 安装钩子   public bool Start()  {   if (hKeyboardHook == 0)   {    //WH_KEYBOARD_LL = 13     hKeyboardHook = SetWindowsHookEx(13, new HookProc(KeyboardHookProc), Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);   }   return (hKeyboardHook != 0);  }  // 卸载钩子   public bool Stop()  {   if (hKeyboardHook != 0)   {    return UnhookWindowsHookEx(hKeyboardHook);   }   return true;  } }}