subject_41053.htm

一些关于vc的问答

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序号：41053 发表者：fyy 发表日期：2003-05-23 16:18:33
<br>主题：怎样使加入的滑动条随影片的播放移动???
<br>内容：我正在用Windows Media Player编写视频记录系统,<BR>但我加入滑动条后,它不会随着影片的播放前进<BR>请各位帮忙,谢了!
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回复者：秋叶禅 回复日期：2003-05-23 16:28:36
<br>内容：用计时器......<BR>在DirectX SDK中有一个例子程序:Jukebox<BR>里面有.......
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<font color=red>答案被接受</font><br>回复者：秋叶禅 回复日期：2003-05-23 16:38:14
<br>内容：下面这个是用DirecgtShow播放视频的。..(也许能给你点提示)<BR>Onplay()<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp; m_TimeSlider.SetPos(0);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;g_rtTotalTime=0;&nbsp;&nbsp; <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SetTimer(TIMERID, TICKLEN, NULL)//启动计时器<BR>}<BR>在OnTimer(.....)<BR>{<BR>&nbsp;&nbsp;ReadMediaPostion();<BR>}<BR>void CVideoDlg::ReadMediaPosition()<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;HRESULT hr;<BR>&nbsp;&nbsp;&nbsp;&nbsp;REFERENCE_TIME rtNow;<BR>&nbsp;&nbsp;&nbsp;&nbsp;hr = pMS-&gt;GetCurrentPosition(&amp;rtNow);<BR>&nbsp;&nbsp;&nbsp;&nbsp;if(FAILED(hr))<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return;<BR>&nbsp;&nbsp;&nbsp;&nbsp;if(g_rtTotalTime != 0) <BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;long lTick = (long)((rtNow*100)/g_rtTotalTime);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_TimeSlider.SetPos(lTick);<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;else<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_TimeSlider.SetPos(0);<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;UpdatePosition(rtNow);<BR><BR>}<BR><BR>void CVideoDlg::UpdatePosition(REFERENCE_TIME rtNow)<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;HRESULT hr;<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;if( rtNow == 0)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;hr&nbsp;&nbsp;= pMS-&gt;GetCurrentPosition(&amp;rtNow);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if(FAILED(hr))<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;//换算时间<BR>&nbsp;&nbsp;&nbsp;&nbsp;unsigned long nTotalMS = (unsigned long)rtNow/10000; //ns--&gt;ms<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;int nSeconds = nTotalMS/1000;<BR>&nbsp;&nbsp;&nbsp;&nbsp;int nMinutes = nSeconds/60;<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;nSeconds %= 60;<BR>&nbsp;&nbsp; //显示<BR>&nbsp;&nbsp;&nbsp;&nbsp;TCHAR szPosition[24], szCurrentString[24];<BR>&nbsp;&nbsp;&nbsp;&nbsp;wsprintf(szPosition, _T("%02dm:%02ds\0"), nMinutes, nSeconds);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_strPosition.GetWindowText(szCurrentString,24);<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;if(_tcscmp(szPosition,szCurrentString))<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_strPosition.SetWindowText(szPosition);<BR><BR>}<BR>
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回复者：fyy 回复日期：2003-05-23 16:55:43
<br>内容：谢了！<BR>我一定会好好研究的<BR>
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