using System;using System.Collections.Generic;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms; namespace ICS.Common
{
/// <summary>
/// 這個類可以讓你得到一個在執行中程式的所有鍵盤或滑鼠事件
/// 並且引發一個帶KeyEventArgs引數的.NET事件以便你很容易使用這些資訊
/// </summary> public class KeyBordHook
{
private const int WM_KEYDOWN = 0x100;
private const int WM_KEYUP = 0x101;
private const int WM_SYSKEYDOWN = 0x104;
private const int WM_SYSKEYUP = 0x105; //全域性的事件
public event KeyEventHandler OnKeyDownEvent;
public event KeyEventHandler OnKeyUpEvent;
public event KeyPressEventHandler OnKeyPressEvent;
static int hKeyboardHook = ; //鍵盤鉤子控制代碼
//滑鼠常量
public const int WH_KEYBOARD_LL = ; //keyboard hook constant
HookProc KeyboardHookProcedure; //宣告鍵盤鉤子事件型別.
//宣告鍵盤鉤子的封送結構型別
[StructLayout(LayoutKind.Sequential)]
public class KeyboardHookStruct
{
public int vkCode; //表示一個在1到254間的虛似鍵盤碼
public int scanCode; //表示硬體掃描碼
public int flags;
public int time;
public int dwExtraInfo;
}
//裝置鉤子的函式
[DllImport("user32.dll ", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
//卸下鉤子的函式
[DllImport("user32.dll ", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(int idHook); //下一個鉤掛的函式
[DllImport("user32.dll ", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);
[DllImport("user32 ")]
public static extern int ToAscii(int uVirtKey, int uScanCode, byte[] lpbKeyState, byte[] lpwTransKey, int fuState);
[DllImport("user32 ")]
public static extern int GetKeyboardState(byte[] pbKeyState);
public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);
/// <summary>
/// 墨認的建構函式構造當前類的例項並自動的執行起來.
/// </summary>
public KeyBordHook()
{
Start();
}
//解構函式.
~KeyBordHook()
{
Stop();
}
public void Start()
{
//安裝鍵盤鉤子
if (hKeyboardHook == )
{
KeyboardHookProcedure = new HookProc(KeyboardHookProc);
hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardHookProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().ManifestModule), );
if (hKeyboardHook == )
{
Stop();
throw new Exception("SetWindowsHookEx ist failed. ");
}
}
}
public void Stop()
{
bool retKeyboard = true; if (hKeyboardHook != )
{
retKeyboard = UnhookWindowsHookEx(hKeyboardHook);
hKeyboardHook = ;
}
//如果卸下鉤子失敗
if (!(retKeyboard)) throw new Exception("UnhookWindowsHookEx failed. ");
}
private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
if ((nCode >= ) && (OnKeyDownEvent != null || OnKeyUpEvent != null || OnKeyPressEvent != null))
{
KeyboardHookStruct MyKeyboardHookStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
//引發OnKeyDownEvent
if (OnKeyDownEvent != null && (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN))
{
Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
KeyEventArgs e = new KeyEventArgs(keyData);
OnKeyDownEvent(this, e);
} //引發OnKeyPressEvent
if (OnKeyPressEvent != null && wParam == WM_KEYDOWN)
{
byte[] keyState = new byte[];
GetKeyboardState(keyState);
byte[] inBuffer = new byte[];
if (ToAscii(MyKeyboardHookStruct.vkCode,
MyKeyboardHookStruct.scanCode,
keyState,
inBuffer,
MyKeyboardHookStruct.flags) == )
{
KeyPressEventArgs e = new KeyPressEventArgs((char)inBuffer[]);
OnKeyPressEvent(this, e);
}
} //引發OnKeyUpEvent
if (OnKeyUpEvent != null && (wParam == WM_KEYUP || wParam == WM_SYSKEYUP))
{
Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
KeyEventArgs e = new KeyEventArgs(keyData);
OnKeyUpEvent(this, e);
}
}
return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
}
}