subject_19974.htm

一些关于vc的问答

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序号：19974 发表者：流流 发表日期：2002-11-01 17:15:45
<br>主题：vfw问题
<br>内容：我用vfw开发视频捕获程序，但是capSetVideoFormat函数<BR>返回错误，怎么回事呀，如果不用capSetVideoFormat<BR>则图像为彩色条文，请帮帮我吧！
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回复者：Norton AntivVirus 回复日期：2002-11-01 20:55:33
<br>内容：&nbsp;&nbsp;&nbsp;&nbsp;capCaptureGetSetup(hCaps, &CaptureParms, sizeof(CaptureParms));<BR>&nbsp;&nbsp;&nbsp;&nbsp;CaptureParms.fAbortLeftMouse = false;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CaptureParms.fAbortRightMouse = false;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CaptureParms.fYield = true;<BR>&nbsp;&nbsp;&nbsp;&nbsp;CaptureParms.dwRequestMicroSecPerFrame = 66667;<BR>&nbsp;&nbsp;&nbsp;&nbsp;capCaptureSetSetup(hCaps, &CaptureParms, sizeof(CaptureParms));<BR>
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回复者：流流 回复日期：2002-11-04 09:14:30
<br>内容：你好：<BR>&nbsp;&nbsp;谢谢您的答复，能不能给我解释解释！
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回复者：Norton AntivVirus 回复日期：2002-11-04 09:20:53
<br>内容：能用吗?<BR><BR>不能用,我就啥也不说了!
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回复者：流流 回复日期：2002-11-04 13:54:37
<br>内容：我刚刚试了一下，还不行，上面的代码放到那合适<BR>是在capDriverConnect之后吗<BR>还是要谢谢您的回答
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<font color=red>答案被接受</font><br>回复者：了了 回复日期：2002-11-05 10:04:11
<br>内容：capSetVideoFormat返回值错误，说明你改的参数不合适，看看下面的用法。<BR>（不过，出彩条好象是PAL制，NTSC制搞错了点现象）<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; int m_nVfs=capGetVideoFormatSize(m_hWnd);<BR>&nbsp;&nbsp;&nbsp;&nbsp;if(!m_nVfs)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return E_FAIL;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; BITMAPINFO *lpBmpInfo = (BITMAPINFO&nbsp;&nbsp;&nbsp;&nbsp;*)( new char[m_nVfs]);<BR>&nbsp;&nbsp;&nbsp;&nbsp;ASSERT(lpBmpInfo);<BR>&nbsp;&nbsp;&nbsp;&nbsp;int ret = capGetVideoFormat(m_hWnd, lpBmpInfo, (WORD)m_nVfs);<BR>&nbsp;&nbsp;&nbsp;&nbsp;if(!ret)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return E_FAIL;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;LPBITMAPINFOHEADER lpd = (LPBITMAPINFOHEADER)lpBmpInfo;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;lpd-&gt;biSize= sizeof BITMAPINFOHEADER;<BR>&nbsp;&nbsp;&nbsp;&nbsp;lpd-&gt;biWidth = 想要的宽度（PAL&lt;720,NTSC&lt;640） ;<BR>&nbsp;&nbsp;&nbsp;&nbsp;lpd-&gt;biHeight = 想要的高度（PAL&lt;576,NTSC&lt;480）;<BR>&nbsp;&nbsp;&nbsp;&nbsp;lpd-&gt;biSizeImage = lpd-&gt;biWidth * lpd-&gt;biHeight * lpd-&gt;biBitCount/8;<BR>&nbsp;&nbsp;&nbsp;&nbsp;capSetVideoFormat(m_hWnd, (LPBITMAPINFO)lpd, ret);
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