subject_53983.htm

vc

<p>
序号：53983 发表者：莹莹菜 发表日期：2003-09-24 17:31:55
<br>主题：弹出式菜单的问题
<br>内容：学习VC第8天，做了一个项目名为Menus的对话框风格的小程序，全是按照教材写的代码，以下是点击左键实现弹出式菜单的函数，编译提示出现一个错误，拜托帮我诊断一下吧。<BR><BR>错误提示<BR>error C2660: 'GetSubMenu' : function does not take 0 parameters<BR>warning C4552: '&gt;&gt;' : operator has no effect; expected operator with side-effect<BR><BR><BR>void CMenusDlg::OnContextMenu(CWnd* pWnd, CPoint point) <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;// TODO: Add your message handler code here<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;////////////////////////////////<BR>&nbsp;&nbsp;&nbsp;&nbsp;// MY CODE STARTS HERE<BR>&nbsp;&nbsp;&nbsp;&nbsp;////////////////////////////////<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;// Delare local variables<BR>&nbsp;&nbsp;&nbsp;&nbsp;CMenu *m_lMenu;&nbsp;&nbsp;// A ponter to the menu<BR>&nbsp;&nbsp;&nbsp;&nbsp;CPoint m_pPoint;&nbsp;&nbsp;// A Copy of the mouse position<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;// Copy the mouse position to a local variable<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_pPoint = point;<BR>&nbsp;&nbsp;&nbsp;&nbsp;// Convert the position to a screen position<BR>&nbsp;&nbsp;&nbsp;&nbsp;ClientToScreen(&amp;m_pPoint);<BR>&nbsp;&nbsp;&nbsp;&nbsp;// Get a pointer to the window menu<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_lMenu - GetMenu();&nbsp;&nbsp;敬告提示行<BR>&nbsp;&nbsp;&nbsp;&nbsp;// Get a pointer to the first submenu<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_lMenu = m_lMenu-&gt;GetSubMenu();&nbsp;&nbsp;错误提示行<BR>&nbsp;&nbsp;&nbsp;&nbsp;// Show the popup menu<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_lMenu-&gt;TrackPopupMenu(TPM_CENTERALIGN + TPM_LEFTBUTTON, m_pPoint.x, m_pPoint.y, this, NULL);<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;////////////////////////////<BR>&nbsp;&nbsp;&nbsp;&nbsp;// MY CODE ENDS HERE<BR>&nbsp;&nbsp;&nbsp;&nbsp;////////////////////////////<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>}<BR><BR>
<br><a href="javascript:history.go(-1)">返回上页</a><br><a href=http://www.copathway.com/cndevforum/>访问论坛</a></p>
<hr size=1>
<blockquote><p>
回复者：david_zhao 回复日期：2003-09-24 18:49:05
<br>内容：GetSubMenu();&nbsp;&nbsp;应该带参数
<br>
<a href="javascript:history.go(-1)">返回上页</a><br><a href=http://www.copathway.com/cndevforum/>访问论坛</a></p></blockquote>
<hr size=1>
<blockquote><p>
回复者：莹莹菜 回复日期：2003-09-24 20:16:36
<br>内容：加上参数后，编译通过了，功能没有实现，并且出现BUG。教材上就没有什么参数，应该怎么改一下呀？<BR><BR>两个警告错误：<BR>warning C4552: '&gt;&gt;' : operator has no effect; expected operator with side-effect<BR>warning C4700: local variable 'm_lMenu' used without having been initialized<BR>
<br>
<a href="javascript:history.go(-1)">返回上页</a><br><a href=http://www.copathway.com/cndevforum/>访问论坛</a></p></blockquote>
<hr size=1>
<blockquote><p>
<font color=red>答案被接受</font><br>回复者：小灿 回复日期：2003-09-25 09:14:49
<br>内容：CMenu menu;<BR>menu.LoadMenu (your menu resource ID);<BR>CMenu *m_lMenu =menu.GetSubMenu (0);<BR>m_lMenu-&gt;TrackPopupMenu(TPM_CENTERALIGN + TPM_LEFTBUTTON, point.x, point.y, this, NULL);<BR>
<br>
<a href="javascript:history.go(-1)">返回上页</a><br><a href=http://www.copathway.com/cndevforum/>访问论坛</a></p></blockquote>
<hr size=1>
<blockquote><p>
回复者：莹莹菜 回复日期：2003-09-25 10:23:22
<br>内容：void CMenusDlg::OnContextMenu(CWnd* pWnd, CPoint point) <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;// TODO: Add your message handler code here<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;////////////////////////////////<BR>&nbsp;&nbsp;&nbsp;&nbsp;// MY CODE STARTS HERE<BR>&nbsp;&nbsp;&nbsp;&nbsp;////////////////////////////////<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;// Delare local variables<BR>&nbsp;&nbsp;&nbsp;&nbsp;CMenu *m_lMenu;&nbsp;&nbsp;// A pointer to the menu<BR>&nbsp;&nbsp;&nbsp;&nbsp;CPoint m_pPoint;&nbsp;&nbsp;// A Copy of the mouse position<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;// Copy the mouse position to a local variable<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_pPoint = point;<BR>&nbsp;&nbsp;&nbsp;&nbsp;// Convert the position to a screen position<BR>&nbsp;&nbsp;&nbsp;&nbsp;ClientToScreen(&amp;m_pPoint);<BR>&nbsp;&nbsp;&nbsp;&nbsp;// Get a pointer to the window menu<BR>&nbsp;&nbsp;&nbsp;&nbsp;//m_lMenu - GetMenu();<BR>&nbsp;&nbsp;&nbsp;&nbsp;// Get a pointer to the first submenu<BR>&nbsp;&nbsp;&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; // david_zhao'contribution<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // ***thanks!***<BR>&nbsp;&nbsp;&nbsp;&nbsp;//m_lMenu = m_lMenu-&gt;GetSubMenu(0); <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ////////////////////////////////////// <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // Show the popup menu<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;//////////////////////////////////////////<BR>&nbsp;&nbsp;&nbsp;&nbsp;// 小灿'contribution&nbsp;&nbsp;*****GOAL!!!*****<BR>&nbsp;&nbsp;&nbsp;&nbsp;CMenu menu;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; menu.LoadMenu (IDR_MENU1);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; m_lMenu =menu.GetSubMenu (0);<BR>&nbsp;&nbsp;&nbsp;&nbsp;//////////////////////////////////////////<BR><BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; m_lMenu-&gt;TrackPopupMenu(TPM_CENTERALIGN + TPM_LEFTBUTTON, m_pPoint.x,<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; m_pPoint.y, this, NULL);<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;////////////////////////////<BR>&nbsp;&nbsp;&nbsp;&nbsp;// MY CODE ENDS HERE<BR>&nbsp;&nbsp;&nbsp;&nbsp;////////////////////////////<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>}<BR><BR>&lt;big&gt;Thank&lt;/big&gt; david_zhao and 小灿！！！<BR>
<br>
<a href="javascript:history.go(-1)">返回上页</a><br><a href=http://www.copathway.com/cndevforum/>访问论坛</a></p></blockquote>