在中Visual Studio .NET 2003利用DirectShow播放媒体文件(五)

王朝vc·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

浏览、播放、暂停、关闭四按钮的相应事件响应函数如下:

void CPlayWndDlg::OnBnClickedBrowseButton()

{

CFileDialog dlgFile(TRUE, NULL, NULL,

OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,

"Movie Files (*.avi;*.mpg;*.mpeg) |

*.avi;*.mpg;*.mpeg |

Audio Files (*.wav;*mp3;*.mpa;*.mpu;*.au) |

*.wav;*.mp3;*.mpa;*.mpu;*.au |

Midi Files (*.mid;*.midi;*.rmi) |

*.mid;*.midi;*.rmi| | ", this);

if(dlgFile.DoModal() == IDOK)

{

m_strMediaFile = dlgFile.GetPathName();

GetDlgItem(IDC_MEDIAFILE_EDIT)->SetWindowText(m_strMediaFile);

}

else

return;

CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC, IID_IGraphBuilder, (void **)&m_pGraph);

HRESULT hr = m_pGraph->RenderFile(CA2W(m_strMediaFile), NULL);

if(FAILED(hr))

{

char szMsg[200];

AMGetErrorText(hr, szMsg, sizeof(szMsg));

AfxMessageBox(szMsg);

}

//指定父窗体

IVideoWindow* pVidWin = NULL;

m_pGraph->QueryInterface(IID_IVideoWindow, (void **)&pVidWin);

pVidWin->put_Owner((OAHWND)m_hWnd);

pVidWin->put_WindowStyle(WS_CHILD | WS_CLIPSIBLINGS | WS_CLIPCHILDREN);

CRect rc;

GetDlgItem(IDC_VW_FRAME)->GetWindowRect(rc);

ScreenToClient(rc);

pVidWin->SetWindowPosition(rc.left, rc.top, rc.Width(), rc.Height());

// 注意此处Filter Graph Manager的事件以WM_GRAPHNOTIFY发出(用户定义的消息).

m_pGraph->QueryInterface(IID_IMediaEventEx, (void **)&m_pEvent);

m_pEvent->SetNotifyWindow((OAHWND)m_hWnd, WM_GRAPHNOTIFY, 0);

// 设置Seeking

m_pGraph->QueryInterface(IID_IMediaSeeking, (void **)&m_pMediaSeeking);

}

void CPlayWndDlg::OnBnClickedPlayButton()

{

Play();

}

void CPlayWndDlg::OnBnClickedPauseButton()

{

m_pMediaControl->Pause();

m_isPlaying = TRUE;

GetDlgItem(IDC_PLAY_BUTTON)->EnableWindow(TRUE);

GetDlgItem(IDC_PAUSE_BUTTON)->EnableWindow(FALSE);

}

void CPlayWndDlg::OnBnClickedCancel()

{

// TODO: 在此添加控件通知处理程序代码

CleanUp();

OnCancel();

}

8.添加对WM_GRAPHNOTIFY消息,及其响应函数

在PlayWndDlg添加消息ID定义:

#define WM_GRAPHNOTIFY WM_USER + 101

在PlayWndDlg.h中,代码如下:

// 实现

protected:

HICON m_hIcon;

// 生成的消息映射函数

virtual BOOL OnInitDialog();

afx_msg void OnSysCommand(UINT nID, LPARAM lParam);

afx_msg void OnPaint();

afx_msg HCURSOR OnQueryDragIcon();

DECLARE_MESSAGE_MAP()

afx_msg HRESULT OnGraphNotify(WPARAM wParam,LPARAM lParam);

private:

IGraphBuilder *m_pGraph;

IMediaControl *m_pMediaControl;

IMediaEventEx *m_pEvent;

PlayWndDlg.cpp,如下:

ON_BN_CLICKED(IDC_BROWSE_BUTTON, OnBnClickedBrowseButton)

ON_BN_CLICKED(IDC_PLAY_BUTTON, OnBnClickedPlayButton)

ON_BN_CLICKED(IDC_PAUSE_BUTTON, OnBnClickedPauseButton)

ON_BN_CLICKED(IDCANCEL, OnBnClickedCancel)

ON_MESSAGE(WM_GRAPHNOTIFY, OnGraphNotify)

END_MESSAGE_MAP()

实现如下:

HRESULT CPlayWndDlg::OnGraphNotify(WPARAM wParam,LPARAM lParam)

{

long levCode, lparam1, lparam2;

HRESULT hr;

while (hr = m_pEvent->GetEvent(&levCode, &lparam1, &lparam2, 0), SUCCEEDED(hr))

{

hr = m_pEvent->FreeEventParams(levCode, lparam1, lparam2);

if ((EC_COMPLETE == levCode) || (EC_USERABORT == levCode))

{

TRACE("End of the media file!!.\n");

Stop();

//CleanUp();

break;

}

}

return hr;

}

有需要者可以与我索取源码

 
 
 
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