subject_17084.htm

一些关于vc的问答

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序号：17084 发表者：王胜 发表日期：2002-10-08 12:17:19
<br>主题：找找错误
<br>内容：我用下面的语句先生成一bmp图象，然后将他贴在视上，可着个图片为什么都是颜色，并没有出现我画的线条，请各位大虾帮帮忙找找错误？？？？？&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CClientDC dc(this);<BR>&nbsp;&nbsp;&nbsp;&nbsp;CRect rect;<BR>&nbsp;&nbsp;&nbsp;&nbsp;GetClientRect(&rect);<BR>&nbsp;&nbsp;&nbsp;&nbsp;dc.MoveTo(0,0);<BR>&nbsp;&nbsp;&nbsp;&nbsp;dc.LineTo (100,100);<BR>&nbsp;&nbsp;&nbsp;&nbsp;dc.LineTo (500,900);<BR>&nbsp;&nbsp;&nbsp;&nbsp;dc.LineTo (500,600);<BR>&nbsp;&nbsp;&nbsp;&nbsp;dc.LineTo (500,900);<BR>&nbsp;&nbsp;&nbsp;&nbsp;CBitmap bm;<BR>&nbsp;&nbsp;&nbsp;&nbsp;bm.CreateCompatibleBitmap(&dc,200,200);<BR>&nbsp;&nbsp;&nbsp;&nbsp;CDC MemDC;<BR>&nbsp;&nbsp;&nbsp;&nbsp;HBITMAP OldBitmap;<BR>&nbsp;&nbsp;&nbsp;&nbsp;MemDC.CreateCompatibleDC(pDC);<BR>&nbsp;&nbsp;&nbsp;&nbsp;OldBitmap=(HBITMAP)MemDC.SelectObject(bm);<BR>&nbsp;&nbsp;&nbsp;&nbsp;pDC-&gt;BitBlt(500,300 ,1024,768,&MemDC,0,0,SRCCOPY);<BR>&nbsp;&nbsp;&nbsp;&nbsp;MemDC.SelectObject (OldBitmap);<BR>&nbsp;&nbsp;&nbsp;&nbsp;MemDC.DeleteDC ();
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回复者：不说 回复日期：2002-10-08 14:31:59
<br>内容：你那个pDC是虾米东西来的？你是想把线画到哪里啊？ bm上？clientdc上？还是显示器的塑料壳上？：）
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回复者：徐景周 回复日期：2002-10-08 16:19:23
<br>内容：可试试选贴位图，再画线，可能是图把你的线复盖了。
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回复者：黄飚 回复日期：2002-10-08 22:19:47
<br>内容：？？？？？&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CClientDC dc(this);<BR>&nbsp;&nbsp;&nbsp;&nbsp;CRect rect;<BR>&nbsp;&nbsp;&nbsp;&nbsp;GetClientRect(&rect);<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;CBitmap bm;<BR>&nbsp;&nbsp;&nbsp;&nbsp;bm.CreateCompatibleBitmap(&dc,200,200);<BR>&nbsp;&nbsp;&nbsp;&nbsp;CDC MemDC;<BR>&nbsp;&nbsp;&nbsp;&nbsp;HBITMAP OldBitmap;<BR>&nbsp;&nbsp;&nbsp;&nbsp;MemDC.CreateCompatibleDC(pDC);<BR>&nbsp;&nbsp;&nbsp;&nbsp;OldBitmap=(HBITMAP)MemDC.SelectObject(bm);<BR>&nbsp;&nbsp;&nbsp;&nbsp;pDC-&gt;BitBlt(500,300 ,1024,768,&MemDC,0,0,SRCCOPY);<BR>&nbsp;&nbsp;&nbsp;&nbsp;MemDC.SelectObject (OldBitmap);<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;CPeng ....颜色<BR>&nbsp;&nbsp;&nbsp;&nbsp;dc.SlectObject()....<BR>&nbsp;&nbsp;&nbsp;&nbsp;dc.MoveTo(0,0);<BR>&nbsp;&nbsp;&nbsp;&nbsp;dc.LineTo (100,100);<BR>&nbsp;&nbsp;&nbsp;&nbsp;dc.LineTo (500,900);<BR>&nbsp;&nbsp;&nbsp;&nbsp;dc.LineTo (500,600);<BR>&nbsp;&nbsp;&nbsp;&nbsp;dc.LineTo (500,900);<BR><BR>&nbsp;&nbsp; <BR>&nbsp;&nbsp;&nbsp;&nbsp;MemDC.DeleteDC (); 
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回复者：王胜 回复日期：2002-10-09 12:27:53
<br>内容：&nbsp;&nbsp; 图形并没有被覆盖,我看到了拷贝的图形,只不过他严重失真,五颜六色的,根本看不到我画的直线????<BR>黄飓,你那样行吗,好象画的线并没有到bm里面去哦!
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回复者：黄飚 回复日期：2002-10-09 12:34:53
<br>内容：你要在OnDraw里画
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<font color=red>答案被接受</font><br>回复者：不说 回复日期：2002-10-09 17:20:59
<br>内容：首先：bm是200X200的，你要把它bitblt到1024X768的大小不失贞才怪……<BR>再次：往bitmap上画图应该是这样的步骤： <BR>1）生成memDC&nbsp;&nbsp; CDC memDC; memDC.CreateCompatibleDC(pDC); /*screen DC or other DC etc.*/<BR>2) 生成bmp CBitmap bm; bm.CreateCompatibleBitmap(pDC, width, height);<BR>3) 把bmp select到memDC里<BR>4）在memDC里画图<BR>5）bitblt/stretchblt到screen DC (i.e. pDC) 就可以显示出来了
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