subject_27535.htm

一些关于vc的问答

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序号：27535 发表者：不败的石头 发表日期：2003-01-13 11:08:56
<br>主题：求救：如何让背景位图随窗口大小缩放
<br>内容：我载入了背景位图后，发现背景位图不能随窗口大小缩放，总是留下空白区，如何解决啊..........总不能采用限定窗口大小这样极端的方法吧<BR>My Source:<BR>BOOL CMyView::OnEraseBkgnd(CDC* pDC) <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;// TODO: Add your message handler code here and/or call default<BR><BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;CRect rect; <BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CDC memDC; <BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CBitmap cBitmap; <BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CBitmap* pOldMemBmp = NULL; <BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;GetWindowRect(&amp;rect); <BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;cBitmap.LoadBitmap(IDB_BACKBMP); <BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;memDC.CreateCompatibleDC(pDC); <BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;pOldMemBmp = memDC.SelectObject(&amp;cBitmap); <BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR> <BR>&nbsp;&nbsp;&nbsp;&nbsp;pDC-&gt;BitBlt(0, 0, rect.Width(), rect.Height(),&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&amp;memDC, 0, 0, SRCCOPY); <BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;if (pOldMemBmp) memDC.SelectObject( pOldMemBmp ); <BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;if(cBitmap.m_hObject!=NULL)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return TRUE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;else<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return CView::OnEraseBkgnd(pDC);<BR>}
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回复者：mm2003 回复日期：2003-01-13 11:10:59
<br>内容：用GETCLIENTRECT()
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回复者：不败的石头 回复日期：2003-01-13 11:20:52
<br>内容：仍无法解决........
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<font color=red>答案被接受</font><br>回复者：爱丽思 回复日期：2003-01-13 11:30:20
<br>内容：用StretchBlt可以缩放的，BitBlt是不能缩放的
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回复者：不败的石头 回复日期：2003-01-13 11:42:07
<br>内容：StretchBlt确实能解决！thanks!再多问一点，应该怎样设置<BR><BR>pDC-&gt;StretchBlt(0, 0, rect.Width(), rect.Height(), &amp;memDC, 0, 0,A,B,SRCCOPY);<BR><BR>里面的A,B,才能让窗口正好放下整幅位图呢 
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回复者：不败的石头 回复日期：2003-01-13 11:47:07
<br>内容：谢谢大家,我自己解决了<BR>BITMAP bkm;<BR>cBitmap.GetObject(sizeof(bkm),&amp;bkm);<BR>pDC-&gt;StretchBlt(0, 0, rect.Width(), rect.Height(), &amp;memDC,0, 0,bkm.bmWidth,bkm.bmHeight,SRCCOPY); <BR>
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