subject_32218.htm

一些关于vc的问答

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序号：32218 发表者：noname2003 发表日期：2003-03-10 20:41:27
<br>主题：屏幕截图为何只有黑白色
<br>内容：void CSView::OnCatchScreeen() //菜单命令处理<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;CDC * pdc=GetDC();<BR>&nbsp;&nbsp;&nbsp;&nbsp;DrawScreen(pdc);<BR>&nbsp;&nbsp;&nbsp;&nbsp;ReleaseDC(pdc);<BR>}<BR><BR><BR>void CSView::DrawScreen(CDC *pDC)<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;CDC *pScreenDC=CDC::FromHandle(::GetDC(NULL));<BR>&nbsp;&nbsp;&nbsp;&nbsp;CDC dcmem;<BR>&nbsp;&nbsp;&nbsp;&nbsp;dcmem.CreateCompatibleDC(pScreenDC);<BR>&nbsp;&nbsp;&nbsp;&nbsp;CBitmap bmp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;int cx=::GetSystemMetrics(SM_CXSCREEN);<BR>&nbsp;&nbsp;&nbsp;&nbsp;int cy=::GetSystemMetrics(SM_CYSCREEN);<BR>&nbsp;&nbsp;&nbsp;&nbsp;bmp.CreateCompatibleBitmap(&amp;dcmem,cx,cy);<BR>&nbsp;&nbsp;&nbsp;&nbsp;dcmem.SelectObject(&amp;bmp);<BR>&nbsp;&nbsp;&nbsp;&nbsp;dcmem.BitBlt(0,0,cx,cy,pScreenDC,0,0,SRCCOPY);<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;pDC-&gt;StretchBlt(0,0,300,300,&amp;dcmem,0,0,cx-1,cy-1,SRCCOPY);<BR><BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;bmp.DeleteObject();<BR>&nbsp;&nbsp;&nbsp;&nbsp;dcmem.DeleteDC();<BR>&nbsp;&nbsp;&nbsp;&nbsp;ReleaseDC(pScreenDC);<BR>}<BR>
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<font color=red>答案被接受</font><br>回复者：lin 回复日期：2003-03-11 09:29:47
<br>内容：类似的问题，我已经回答了N次<BR><BR>查看下面的内容，稍稍修改一下就可实现你的要求<BR>http://www.vchelp.net/cndevforum/subject_view.asp?subject_id=26505&amp;forum_id= <BR><BR>或论坛中的这个主题：<BR>如何取得任何时候得桌面图片，并将其显示出来 
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