Mfc message routine.
现在维护的一个软件还是用mfc写的，最近被要加入一个功能弄得焦头烂额。主要现象就是加入的菜单的响应函数没被call到
上网搜索，在官方网站找到了不少资料
主要链接如下
https://msdn.microsoft.com/en-us/library/shfzay75.aspx
https://msdn.microsoft.com/en-us/library/2zdbzhex.aspx
文中介绍了一个例子
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The main frame window receives the command message first.
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The main MDI frame window gives the currently active MDI child window a chance to handle the command.
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The standard routing of an MDI child frame window gives its view a chance at the command before checking its own message map.
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The view checks its own message map first and, finding no handler, next routes the command to its associated document.
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The document checks its message map and finds a handler. This document member function is called and the routing stops.
最后找到一个办法，就是重载CMainFrm的OnCmdMsg函数
但比较恶心的是需要检查menu id，否则在dialog的omcmdmsg可能会回掉会mainfrm导致循环调用爆掉
BOOL CMainFrame::OnCmdMsg(UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo) { if (CFrameWndEx::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo)) return TRUE; if (nID == ID_VIEW_TEST) { if (aboutDlg) { if (aboutDlg->OnCmdMsg(nID, nCode, pExtra, pHandlerInfo)) return TRUE; } } return FALSE; }