MFC 下拉框下拉条目宽高设置

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：