VC制作类似于IE4的酷工具条

VC制作类似于IE4的酷工具条(4)     afx_msg void OnDropDown(NMHDR* pNotifyStruct, LRESULT* pResult);
在MainFrame.cpp中的MESSAGE_MAP加入消息映射
    ON_NOTIFY(TBN_DROPDOWN, AFX_IDW_TOOLBAR, OnDropDown)
和处理函数体：
void CMainFrame::OnDropDown(NMHDR* pNotifyStruct, LRESULT* pResult)
{
    // this function handles the dropdown menus from the toolbar
    NMTOOLBAR* pNMToolBar = (NMTOOLBAR*)pNotifyStruct;
    CRect rect;

    // translate the current toolbar item rectangle into screen coordinates
    // so that we'll know where to pop up the menu
    m_wndToolBar.GetToolBarCtrl().GetRect(pNMToolBar->iItem, &rect);
    rect.top = rect.bottom;
    ::ClientToScreen(pNMToolBar->hdr.hwndFrom, &rect.TopLeft());
    if(pNMToolBar->iItem == ID_FILE_PRINT_SETUP)
    {
        CMenu menu;
        CMenu* pPopup;

        // the font popup is stored in a resource
        menu.LoadMenu(IDR_PRINT_POPUP);
        pPopup = menu.GetSubMenu(0);
        pPopup->TrackPopupMenu(TPM_LEFTALIGN ¦ TPM_LEFTBUTTON, rect.left, rect.top + 1, AfxGetMainWnd());
    }
    *pResult = TBDDRET_DEFAULT;
}

7．    处理对Combox的响应，这里只对内容改变的消息进行处理，若要添加别的处理，参看Combo Box Handlers的消息映射。
在MainFrame.h中加入    afx_msg void OnNewAddress();
在MainFrame.cpp中的MESSAGE_MAP中加入消息映射
    ON_CBN_SELENDOK(AFX_IDW_TOOLBAR + 1,OnNewAddress)
同时加入函数体
void CMainFrame::OnNewAddress()
{
    CString str;