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有时候下拉框（MFC标准叫组合框，CComboBox）中条目文本很多，超过了下拉框的宽度，如果不加设置的话，超过的部分文本将无法显示，查找MSDN，发现解决方法，代码如下：

代码

// 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);

效果图：