在中Visual Studio .NET 2003利用DirectShow播放媒体文件(四)

在中VisualStudio.NET2003利用DirectShow播放媒体文件(四)//IDC_VW_FRAME控件PictureControl主要作用是控制VedioWindow的显示位置voidCPlayWndDlg::MoveVideoWindow(void){IVideoWindow*pVideoWinow=NULL;if(m_pGraph){m_pGraph->QueryInterface(IID_IVideoWindow,(void**)&pVideoWinow);CRectrc;GetDlgItem(IDC_VW_FRAME)->GetWindowRect(rc);ScreenToClient(rc);pVideoWinow->SetWindowPosition(rc.left,rc.top,rc.Width(),rc.Height());pVideoWinow->Release();pVideoWinow=NULL;}}voidCPlayWndDlg::CleanUp(void){longlevCode;IVideoWindow*pVidWin=NULL;if(!m_pGraph)return;m_pGraph->QueryInterface(IID_IVideoWindow,(void**)&pVidWin);m_pEvent->WaitForCompletion(INFINITE,&levCode);pVidWin->put_Visible(OAFALSE);pVidWin->Release();m_pMediaSeeking->Release();m_pMediaControl->Release();m_pEvent->Release();m_pGraph->Release();m_pMediaSeeking=NULL;m_pMediaControl=NULL;m_pEvent=NULL;m_pGraph=NULL;UpdateData(FALSE);CClientDCdc(GetDlgItem(IDC_VW_FRAME));dc.SetBkColor(RGB(0,0,0));CRectrc;GetDlgItem(IDC_VW_FRAME)->GetClientRect(rc);ClientToScreen(rc);dc.FillRect(rc,CBrush::FromHandle((HBRUSH)GetStockObject(BLACK_BRUSH)));Invalidate();}BOOLCPlayWndDlg::Stop(void){IVideoWindow*pVidWin=NULL;HRESULThr;if(m_pMediaControl){LONGLONGpos=0;hr=m_pMediaControl->Stop();hr=m_pMediaSeeking->SetPositions(&pos,AM_SEEKING_AbsolutePositioning,&pos,AM_SEEKING_NoPositioning);m_pGraph->QueryInterface(IID_IVideoWindow,(void**)&pVidWin);pVidWin->put_Visible(OAFALSE);m_isPlaying=FALSE;GetDlgItem(IDC_PLAY_BUTTON)->EnableWindow(TRUE);GetDlgItem(IDC_PAUSE_BUTTON)->EnableWindow(FALSE);pVidWin->Release();longlevCode;m_pEvent->WaitForCompletion(INFINITE,&levCode);m_pMediaControl->Release();returnTRUE;}returnFALSE;}BOOLCPlayWndDlg::Play(void){//运行IVideoWindow*pVidWin=NULL;if(m_pGraph){m_pGraph->QueryInterface(IID_IVideoWindow,(void**)&pVidWin);pVidWin->put_Visible(OATRUE);m_pGraph->QueryInterface(IID_IMediaControl,(void**)&m_pMediaControl);m_pMediaControl->Run();m_isPlaying=TRUE;GetDlgItem(IDC_PLAY_BU