CLSIDFromString/StringFromCLSID

CLSIDFromString:将字符串方式表达的GUID转换为CLSID结构

StringFromCLSID :将CLSID结构转换为字符串方式

 UnregisterDeviceNotification(m_hDevNotify);

    m_hDevNotify = RegisterDeviceNotification(m_hWnd, &NotificationFilter, DEVICE_NOTIFY_WINDOW_HANDLE);