CMFCMenuBar 菜单项 前面的对勾响应

//MainFrm.h
// ... ... 
bool isEnable; // if the submenu is enable
bool isChecked; // if the submenu is checked
// ... ...
// define On_Update_Menu handler
afx_msg void OnUpdateMenu(CCmdUI* pCmdUI);
// ... ...

//MainFrm.cpp
// ... ...
BEGIN_MESSAGE_MAP(CMainFrame, CFrameWndEx)
// ... ...
ON_UPDATE_COMMAND_UI(ID_SUBMENU1/*Submenu's command ID*/, OnUpdateMenu)

END_MESSAGE_MAP()

// ... ...

void CMainFrame::OnUpdateMenu(CCmdUI* pCmdUI)
{
 // set the state of the submenu.
 // You can resign the value of isChecked and isEnable in other handler to control the state of this submenu.
 if(pCmdUI->m_nID == ID_SUBMENU1)
 {
 pCmdUI->SetCheck(isChecked);
 pCmdUI->Enable(isEnable);
 }
}