SetWindowsHookEx 钩子函数

版权声明： https://blog.csdn.net/dashoumeixi/article/details/83754389

#define EXPORT extern "C" _declspec(dllexport)

//可以指定成共享数据段  #pragma data_seg("shared") ....
HHOOK g_hook = NULL;

HINSTANCE g_dll = NULL;
BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
					 )
{
	g_dll = hModule;
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}
	return TRUE;
}


//唯一要注意的就是这个函数了
LRESULT CALLBACK keyProc(int    code,WPARAM wParam,LPARAM lParam)
{
    //见msdn
	if (code < 0)
		return CallNextHookEx(g_hook, code, wParam, lParam);

    //如果有键盘输入
	if (HC_ACTION == code && lParam > 0){
        
		TCHAR buf[MAX_PATH];
        
        //看看是什么按键
		GetKeyNameTextW(lParam, buf, MAX_PATH);
		MessageBox(NULL, buf, NULL, MB_OK);
	}
    
    //这行别忘记了 . 可以注释掉看看
	return CallNextHookEx(g_hook, code, wParam, lParam);
}


//设置键盘钩子
EXPORT void setHookOn()
{
	g_hook = SetWindowsHookEx(WH_KEYBOARD, keyProc, g_dll, 0);
}


EXPORT void setHookOff()
{
	UnhookWindowsHookEx(g_hook);
}