有時候下拉框（MFC標準叫組合框，CComboBox）中條目文本很多，超過了下拉框的寬度，如果不加設(shè)置的話，超過的部分文本將無法顯示，查找MSDN，發(fā)現(xiàn)解決方法，代碼如下：

代碼

// The pointer to my combo box.
    extern CComboBox* pmyComboBox;

    // Set the height of every item so the item
    // is completely visible.
    CString str;
    CSize   sz;
    int     dx=0;
    CDC*    pDC = pmyComboBox->GetDC();
    for (int i=0;i < pmyComboBox->GetCount();i++)
    {
        pmyComboBox->GetLBText( i, str );
        sz = pDC->GetTextExtent(str);

        // Only want to set the item height if the current height
        // is not big enough.
        if (pmyComboBox->GetItemHeight(i) < sz.cy)
            pmyComboBox->SetItemHeight( i, sz.cy );

        // Only want to set the item width if the current width
        // is not big enough.
        if (pmyComboBox->GetDroppedWidth() < sz.cx)
        {
            pmyComboBox->SetDroppedWidth(sz.cx + 20);
        }
    }
    pmyComboBox->ReleaseDC(pDC);

效果圖：