全局键盘钩子

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使用时,只需实例化Hook类的一个实例,然后调用start()安装钩子,stop()拆除钩子.

如 Hook hk = new Hook();

hk.start();

hk.stop();

//--------------全局键盘钩子类Hook------------------

using System;
using System.Linq;
using System.Collections.Generic;
using System.Text;

using System.Runtime.InteropServices;

namespace SmartDeviceProject1
{
public class Hook
{

public delegate int HookKeyProc(int code, IntPtr wParam, IntPtr lParam);

private HookKeyProc hookKeyDeleg;

public Hook()
{ }

#region public methods

        //安装钩子
        public void Start()
        {

if (hHookKey != 0)
{

//Unhook the previouse one

this.Stop();

}

hookKeyDeleg = new HookKeyProc(HookKeyProcedure);

hHookKey = SetWindowsHookEx(WH_KEYBOARD_LL, hookKeyDeleg, GetModuleHandle(null), 0);

if (hHookKey == 0)
{

throw new SystemException("Failed acquiring of the hook.");

}

        //拆除钩子
        public void Stop()
        {
            UnhookWindowsHookEx(hHookKey);
        }

#endregion

#region protected and private methods

private int HookKeyProcedure(int code, IntPtr wParam, IntPtr lParam)
{

KBDLLHOOKSTRUCT hookStruct = (KBDLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(KBDLLHOOKSTRUCT));

if (code < 0)

return CallNextHookEx(hookKeyDeleg, code, wParam, lParam);

            if (hookStruct.vkCode == 0x5B)
            {
                //如果捕捉到VK_LWIN按键
                //......处理......

return -1; //返回-1表示已经处理了，不再往下传递
}

            if (hookStruct.vkCode == 0x25)
            {
                //如果捕捉到VK_LEFT按键
                //......处理......

return -1;
}

            // 没处理的键的消息往下传递
            return CallNextHookEx(hookKeyDeleg, code, wParam, lParam);

}

#endregion

#region P/Invoke declarations

[DllImport("coredll.dll")]

private static extern int SetWindowsHookEx(int type, HookKeyProc HookKeyProc, IntPtr hInstance, int m);
//private static extern int SetWindowsHookEx(int type, HookMouseProc HookMouseProc, IntPtr hInstance, int m);

[DllImport("coredll.dll")]

private static extern IntPtr GetModuleHandle(string mod);

[DllImport("coredll.dll")]

private static extern int CallNextHookEx(

HookKeyProc hhk,

int nCode,

IntPtr wParam,

IntPtr lParam

);

[DllImport("coredll.dll")]

private static extern int GetCurrentThreadId();

[DllImport("coredll.dll", SetLastError = true)]

private static extern int UnhookWindowsHookEx(int idHook);

private struct KBDLLHOOKSTRUCT
{

public int vkCode;

public int scanCode;

public int flags;

public int time;

public IntPtr dwExtraInfo;

}

const int WH_KEYBOARD_LL = 20;

public class KeyBoardInfo
{

public int vkCode;

public int scanCode;

public int flags;

public int time;

}

#endregion

}

}