想用全局钩子屏蔽 QQ截屏 【失败】

可能判断组合键的方法有点问题

#define _WIN32_WINNT    0x0501
#define STRICT
#define WIN32_LEAN_AND_MEAN
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
DWORD g_main_tid = 0;
HHOOK g_kb_hook = 0;
BOOL CALLBACK con_handler (DWORD)
{
	PostThreadMessage (g_main_tid, WM_QUIT, 0, 0);
	return TRUE;
};
LRESULT CALLBACK kb_proc (int code, WPARAM w, LPARAM l)
{
	PKBDLLHOOKSTRUCT p = (PKBDLLHOOKSTRUCT)l;
	const char *info = NULL;
	if (w == WM_KEYDOWN)
	{
		info = "key dn";
	}
	else if (w == WM_KEYUP)
		info = "key up";
	else if (w == WM_SYSKEYDOWN)
		info = "sys key dn";
	else if (w == WM_SYSKEYUP)
		info = "sys key up";
	printf ("%s - vkCode [%04x], scanCode [%04x]/n",
		info, p->vkCode, p->scanCode);
	if (p->vkCode==65 && ((p->flags & LLKHF_ALTDOWN)!=0) && ((GetKeyState(VK_CONTROL) & 0x8000) != 0))
	{
		printf("Crtl + ALT +A /n");
		return TRUE;
	}
	return CallNextHookEx (g_kb_hook, code, w, l);
};

int _tmain(int argc, _TCHAR* argv[])
{
	g_main_tid = GetCurrentThreadId ();
	SetConsoleCtrlHandler (&con_handler, TRUE);
	g_kb_hook = SetWindowsHookEx (
		WH_KEYBOARD_LL,
		&kb_proc,
		GetModuleHandle (NULL), 
		0);
	if (g_kb_hook == NULL)
	{
		fprintf (stderr,
			"SetWindowsHookEx failed with error %d/n",
			::GetLastError ());
		return 0;
	};
	MSG msg;
	while (GetMessage (&msg, NULL, 0, 0))
	{
		TranslateMessage (&msg);
		DispatchMessage (&msg);
	};
	UnhookWindowsHookEx (g_kb_hook);
	return 0;
}