添加了: `DUI_BEGIN_MESSAGE_MAP(MainWndFrame, CNotifyPump) DUI_ON_MSGTYPE(DUI_MSGTYPE_CLICK, OnClick) DUI_END_MESSAGE_MAP()`之后,提示如下: 错误 1 error LNK2001: 无法解析的外部符号 "protected: static struct DuiLib::DUI_MSGMAP const DuiLib::WindowImplBase::messageMap" (?messageMap@WindowImplBase@DuiLib@@1UDUI_MSGMAP@2@B) C:\Users\Documents\Visual Studio 2013\Projects\Helloworld\Helloworld\MainWndFrame.obj Helloworld ,请问这个是哪里做错了吗?