subject_32306.htm

vc

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序号：32306 发表者：luckyding 发表日期：2003-03-11 12:51:00
<br>主题：请看这段代码！
<br>内容：BOOL CMainFrame::PreCreateWindow(CREATESTRUCT&amp; cs)<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;if( !CFrameWnd::PreCreateWindow(cs) )<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return FALSE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;// TODO: Modify the Window class or styles here by modifying<BR>&nbsp;&nbsp;&nbsp;&nbsp;//&nbsp;&nbsp;the CREATESTRUCT cs<BR>&nbsp;&nbsp;&nbsp;&nbsp;cs.style &amp;= ~FWS_ADDTOTITLE; <BR>&nbsp;&nbsp;&nbsp;&nbsp;m_strTitle = "MY TESTING PROGRAM";<BR>&nbsp;&nbsp;&nbsp;&nbsp;HICON hIcon = AfxGetApp() -&gt;LoadIcon(IDI_ICON_DW);<BR>&nbsp;&nbsp;&nbsp;&nbsp;AfxGetApp() -&gt;m_pMainWnd -&gt;SendMessage(WM_SETICON,ICON_SMALL,(LPARAM)hIcon);<BR>&nbsp;&nbsp;&nbsp;&nbsp;return TRUE;<BR>}<BR>为何在AfxGetApp() -&gt;m_pMainWnd -&gt;SendMessage(WM_SETICON,ICON_SMALL,(LPARAM)hIcon);时有ASSERT错误，好像意思是说AfxGetApp() -&gt;m_pMainWnd 并不是一个窗体指针！，见下：<BR><BR>_AFXWIN_INLINE LRESULT CWnd::SendMessage(UINT message, WPARAM wParam, LPARAM lParam)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{ ASSERT(::IsWindow(m_hWnd)); return ::SendMessage(m_hWnd, message, wParam, lParam); }
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<font color=red>答案被接受</font><br>回复者：check 回复日期：2003-03-11 12:56:09
<br>内容：在函数PreCreateWindow中主窗口还没有建立，不能向他发消息<BR>此时，m_pMainWnd=NULL
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回复者：luckyding 回复日期：2003-03-11 13:04:44
<br>内容：噢，那我想在一开始就改变图标，该在什么地方sendmessage呢
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回复者：check 回复日期：2003-03-12 12:59:02
<br>内容：可以在视图类的OnInitialUpdate中
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