鼠标钩子安装，实现获取鼠标的全局点击位置

HHOOK g_hook;
HINSTANCE g_hInstance;
HWND g_hWnd;

g_hInstance = NULL;
g_hWnd = m_hWnd;
g_hook = SetWindowsHookEx(WH_MOUSE_LL, (HOOKPROC)LowLevelMouseProc, g_hInstance, 0);

LRESULT CALLBACK LowLevelMouseProc(
	int nCode,
	WPARAM wParam,
	LPARAM lParam
)
{
	if (wParam == WM_LBUTTONDOWN)
	{
		MOUSEHOOKSTRUCT* mhookstruct;   //鼠标HOOK结构体
		mhookstruct = (MOUSEHOOKSTRUCT*)lParam;
		POINT pt = mhookstruct->pt;
		//将当前鼠标坐标点的x，y坐标作为参数向主程序窗口发送消息
		::PostMessage(g_hWnd, WM_LBUTTONDOWN, MK_CONTROL, MAKELPARAM(pt.x, pt.y));
	}
	return CallNextHookEx(g_hook, nCode, wParam, lParam);
}