hook.cpp

这个是我们学校用的VC++教案

// Hook.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"
#include "Hook.h"

HINSTANCE  hInstance;
HHOOK  hhkKeyboard;

BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
					 )
{
    switch (ul_reason_for_call)
	{
		case DLL_PROCESS_ATTACH:
		case DLL_THREAD_ATTACH:
		case DLL_THREAD_DETACH:
		case DLL_PROCESS_DETACH:
			break;
    }
	hInstance=(HINSTANCE) hModule;  // DLL的句柄
    return TRUE;
}

LRESULT  KeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
// 在该函数中对所截获的键盘消息进行处理
	MessageBeep(-1);   // 当敲击键盘时扬声器发声
	return  CallNextHookEx(NULL, nCode, wParam, lParam);  // 传递到下一个钩子过程
}
HOOK_API  BOOL  EnableKeyboardCapture()
{
if(!(hhkKeyboard=SetWindowsHookEx(WH_KEYBOARD,
         (HOOKPROC)KeyboardProc, hInstance, 0)))  // 安装钩子
	return  FALSE;
return  TRUE;
}
HOOK_API  BOOL  DisableKeyboardCapture()
{
		return  UnhookWindowsHookEx(hhkKeyboard);  // 释放钩子
}

/*
// This is an example of an exported variable
HOOK_API int nHook=0;

// This is an example of an exported function.
HOOK_API int fnHook(void)
{
	return 42;
}

// This is the constructor of a class that has been exported.
// see Hook.h for the class definition
CHook::CHook()
{ 
	return; 
}
*/