subject_25421.htm

一些关于vc的问答

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序号：25421 发表者：luowen 发表日期：2002-12-22 11:03:14
<br>主题：帮我看看，我想在对话框用一张图片做为背景，为什么不能显示？？？？？
<br>内容：BOOL CGuessNumDlg::OnEraseBkgnd(CDC* pDC) <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;// TODO: Add your message handler code here and/or call default<BR>&nbsp;&nbsp;&nbsp;&nbsp;CBitmap bmp;<BR>//&nbsp;&nbsp;&nbsp;&nbsp;bmp.LoadBitmap(IDB_BITMAP1);<BR><BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;bmp.m_hObject=(HBITMAP)LoadImage(NULL,"F:\\11.bmp",IMAGE_BITMAP,0,0,LR_DEFAULTSIZE|LR_LOADFROMFILE);<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;CDC dc;<BR>&nbsp;&nbsp;&nbsp;&nbsp;dc.CreateCompatibleDC(pDC);<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;CRect rect;<BR>//&nbsp;&nbsp;&nbsp;&nbsp;GetClientRect(rect);<BR>//&nbsp;&nbsp;&nbsp;&nbsp;GetDlgItem()-&gt;GetWindowRect(rect);<BR>//&nbsp;&nbsp;&nbsp;&nbsp;GetDlgItem(IDD_GUESSNUM_DIALOG)-&gt;GetWindowRect(rect);<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;BITMAP bm;<BR>&nbsp;&nbsp;&nbsp;&nbsp;bmp.GetObject(sizeof(BITMAP),&amp;bm);<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CBitmap *oldbmp=dc.SelectObject(&amp;bmp);<BR><BR>//&nbsp;&nbsp;&nbsp;&nbsp;pDC-&gt;BitBlt(x,y,bm.bmWidth,bm.bmHeight,&amp;dc,0,0,SRCCOPY);<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;pDC-&gt;BitBlt(0,0,300,300,&amp;dc,0,0,SRCCOPY);<BR><BR><BR><BR>&nbsp;&nbsp;return CDialog::OnEraseBkgnd(pDC);<BR>}
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<font color=red>答案被接受</font><br>回复者：tjhe 回复日期：2002-12-22 11:13:25
<br>内容：可能最后一句话有问题。<BR><BR>如果有图（bmp.m_hObject!=NULL）则显示图，返回TRUE;<BR>否则返回CDialog::OnEraseBkgnd(pDC);
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回复者：luowen 回复日期：2002-12-22 11:17:10
<br>内容：好了，谢谢，
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