subject_54532.htm

vc

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序号：54532 发表者：莹莹菜 发表日期：2003-09-28 20:10:56
<br>主题：void函数的return问题
<br>内容：应用程序添加ActiveX控件FlexGrid，鼠标双击事件的函数<BR><BR>去掉语句<BR>&nbsp;&nbsp;&nbsp;&nbsp;if (m_iMouseCol = 0)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return;<BR>双击除第一列外的列标题，该列变成网格中的第一列，符合程序的意图。加上这两个语句后，双击列标题，变成网格中该列的前一列。其它列m_iMouseCol不等于0。这是怎么回事呀？<BR><BR>void CActiveXDlg::OnDblClickMsfgrid() <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.<BR>&nbsp;&nbsp;&nbsp;&nbsp;// If the selected column was the first column, there's nothing to do<BR>&nbsp;&nbsp;&nbsp;&nbsp;&lt;big&gt;if (m_iMouseCol = 0)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return;&lt;/big&gt;<BR>&nbsp;&nbsp;&nbsp;&nbsp;// Turn the control redraw off<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_ctlFGrid.SetRedraw(FALSE);<BR>&nbsp;&nbsp;&nbsp;&nbsp;// Change the selected column position<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_ctlFGrid.SetColPosition(m_iMouseCol, 0);<BR>&nbsp;&nbsp;&nbsp;&nbsp;// Turn redraw back on<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_ctlFGrid.SetRedraw(TRUE);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>}<BR>
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<font color=red>答案被接受</font><br>回复者：擎天柱 回复日期：2003-09-28 20:51:44
<br>内容：&nbsp;&nbsp;&nbsp;&nbsp;if (m_iMouseCol == 0)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return;
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回复者：莹莹菜 回复日期：2003-09-28 21:18:02
<br>内容：我真傻，真的
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回复者：yanang 回复日期：2003-09-29 10:19:24
<br>内容：有办法防止这种错误，一般的做法是<BR>if(0==m_iMouseCol)<BR>&nbsp;&nbsp; return;<BR>这是ＶＣ中常用的做法，如果写少了，就会出错，那样就可以知你少写了一个=<BR>2003-9-29 10:20:56