subject_19497.htm

一些关于vc的问答

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序号：19497 发表者：陈旭 发表日期：2002-10-29 13:46:15
<br>主题：关于popupmenu
<br>内容：我作了个多view的程序，一个是ctreeview，一个是显示的view，在显示的view中定义了一个popupmenu，当我在ctreeview中选中某一item时，popupmenu才能有效（菜单中的id才有效），<BR>我用了一个全局的bool变量来控制，但是好像我选中了一个item后使popupmenu有效，以后就一直有效，怎么才能使之在我不选item的时候无效啊<BR>代码如下：<BR>void CSnmpTreeView::OnSelchanged(NMHDR* pNMHDR, LRESULT* pResult) <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;<BR>&nbsp;&nbsp;&nbsp;&nbsp;// TODO: Add your control notification handler code here<BR>&nbsp;&nbsp;&nbsp;&nbsp;CString tempstring;<BR>&nbsp;&nbsp;&nbsp;&nbsp;HTREEITEM hItem=m_TreeCtrl-&gt;GetRootItem();<BR>&nbsp;&nbsp;&nbsp;&nbsp;if(m_TreeCtrl-&gt;ItemHasChildren(hItem)==0)return;<BR>&nbsp;&nbsp;&nbsp;&nbsp;HTREEITEM CurItem=m_TreeCtrl-&gt;GetSelectedItem();<BR>&nbsp;&nbsp;&nbsp;&nbsp;tempstring=m_TreeCtrl-&gt;GetItemText(CurItem);<BR>&nbsp;&nbsp;&nbsp;&nbsp;if(CurItem!=NULL)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_PopMenu=TRUE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;else<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_PopMenu=FALSE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;*pResult = 0;<BR>}<BR>好像选中一次item后，就永远不会到else里去执行，那位大虾帮我想想啊
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回复者：我本大梦人 回复日期：2002-10-29 15:06:20
<br>内容：将"if(CurItem!=NULL)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_PopMenu=TRUE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;else<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_PopMenu=FALSE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}"<BR>改为"if(tempstring=="popmenu")<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_PopMenu=TRUE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;else<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_PopMenu=FALSE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}"<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;
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回复者：surer 回复日期：2002-10-29 15:11:34
<br>内容：问题是我要操作很多item，哪能直接等
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<font color=red>答案被接受</font><br>回复者：我本大梦人 回复日期：2002-10-29 15:54:48
<br>内容：那你每个item的响应是否都不同呢？如果都不同，就用switch ...case吧，如果只有一个不同，那就用'！='不就得了
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