Timothy's Space 君看一叶舟，出没风波里

回调函数：

LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
BOOL fEatKeystroke = FALSE;
PKBDLLHOOKSTRUCT p = NULL;

if (nCode == HC_ACTION)
{
p = (PKBDLLHOOKSTRUCT) lParam;
switch (wParam)
{
case WM_KEYDOWN:
// Backdoor to user information
if (p->vkCode == VK_F8)
{
::MessageBox(NULL,”Let’s make things better and better!\n”,”HQ Tech”,MB_OK);
break;
}
case WM_SYSKEYDOWN:
case WM_KEYUP:
case WM_SYSKEYUP:
fEatKeystroke = (p->vkCode == VK_LWIN) || (p->vkCode == VK_RWIN) || // 屏蔽Win
// 屏蔽Alt+Tab
((p->vkCode == VK_TAB) && ((p->flags & LLKHF_ALTDOWN) != 0)) ||
// 屏蔽Alt+Esc
((p->vkCode == VK_ESCAPE) && ((p->flags & LLKHF_ALTDOWN) != 0)) ||
// 屏蔽Ctrl+Esc
((p->vkCode == VK_ESCAPE) && ((GetKeyState(VK_CONTROL) & 0×8000) != 0));
break;
default:
break;
}
}

return (fEatKeystroke ? TRUE : CallNextHookEx(glhHook,nCode,wParam,lParam));
}

安装及卸载钩子：

void _stdcall StartKeyMask()
{
// 安装钩子
glhHook = SetWindowsHookEx(WH_KEYBOARD_LL,LowLevelKeyboardProc,glhInstance,0);
}

void _stdcall StopKeyMask()
{
// 卸载钩子
if (glhHook!=NULL)
UnhookWindowsHookEx(glhHook);
}

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