别让MSDN忽悠了你

浅浅的花香味﹌ 2022-08-27 04:51 197阅读 0赞

**虽说MSDN代码是微软的高手写的，很正确很权威.不过它有时候也有很龌龊的一面，为了不影响到广大的青少年和小朋友们，下面举例说明： MSDN为VS2005版，查询函数CListBox::DeleteString的说明如下**

Deletes the item in position nIndex from the list box.

<table> 
 <tbody> 
  <tr> 
   <th align="left">&nbsp;</th> 
  </tr> 
  <tr> 
   <td> <pre><strong>int</strong> <strong>DeleteString(</strong>
<strong>   UINT</strong> <span>nIndex</span> 
<strong>);</strong></pre> </td> 
  </tr> 
 </tbody> 
</table>

#### Parameters ####

nIndex

Specifies the zero-based index of the string to be deleted.

# ![Collapse image][]Return Value #

A count of the strings remaining in the list. The return value is **LB\_ERR** if nIndex specifies an index greater than the number of items in the list.

# ![Collapse image][]Remarks #

All items following nIndex now move down one position. For example, if a list box contains two items, deleting the first item will cause the remaining item to now be in the first position. nIndex=0 for the item in the first position.

# ![Collapse image][]Example #

<table> 
 <tbody> 
  <tr> 
   <th>&nbsp;</th> 
   <th><span><img alt="CopyCode image" align="absMiddle">Copy Code</span></th> 
  </tr> 
  <tr> 
   <td colspan="2"> <pre>// The pointer to my list box.
extern CListBox* pmyListBox;

// Delete every other item from the list box.
for (int i=0;i &lt; pmyListBox-&gt;<font><font>GetCount()</font>/*每次大小都减一*/</font>;i++)
{
   <strong><font>pmyListBox-&gt;DeleteString( i );</font><p><font>//并不是我们预料的那样删除，因为删除一个后，后面的元素索引将前移一位</font></p></strong>
}</pre> </td> 
  </tr> 
 </tbody> 
</table>

正确的做法应该是

**for (int i(pmyListBox->GetCount()-1);i >=0;--i) \{    pmyListBox->DeleteString( i ); \}**

**以上只是为了说明DeleteString的用法，如果想达到上述目的，**

**可以while(LB\_ERR!=pComBox->DeleteString(0));**

**或者更直接pComBox->ResetContent();**

[Collapse image]: