如何用avcapture控件来从摄像头读取数据？

Question

如何用avcapture控件来从摄像头读取数据，也就是使用什么函数？谢谢！

Answer 1

http://rechard.vip.sina.com/AVCHelp.htm

Answer 2

GetCurrentImage方法 从当前视频流中抓取一帧图象到一个Picture对象中 参数：     无。 返回值：     如果成功返回一个Picture对象，该Picture对象中包含本方法调用所抓取的图象。 VB语法：     Dim Pic as StdPicture     Set Pic = Object.GetCurrentImage VC语法：     CPicture oPic;     oPic = Object.GetCurrentImage(); 说明：     该方法在当前视频流中以DIB位图格式抓取被调用瞬间的一帧图象，并以此位图创建和返回一个标准Picture对象。[为了保证该方法的成功调用，建议安装DirectX 8.x]

Answer 3

TCHAR    achDeviceName[80] ;
    TCHAR    achDeviceVersion[100] ;
CString csBuffer;
    DWORD dwError ;
    HMENU hMenu ;

    m_hWndCap = capCreateCaptureWindow("Capture Window",WS_CHILD | WS_VISIBLE,
0,0, YCOLS, YROWS,/*m_rectView*/this->GetSafeHwnd(), (int) 0); RegisterHotKey(m_hWndCap,GlobalAddAtom("sdfsdf"),MOD_CONTROL,'S');    capCaptureGetSetup(m_hWndCap, &m_CapParms, sizeof(CAPTUREPARMS)) ;
m_CapParms.wNumVideoRequested        = 10;
m_CapParms.wPercentDropForError      = 10;
m_CapParms.wNumAudioRequested        = 4;
m_CapParms.fAbortLeftMouse           = 0x0;
m_CapParms.fAbortRightMouse          = 0x0;
m_CapParms.dwRequestMicroSecPerFrame = 1000000/FRAMES_FOR_PS;
m_CapParms.dwAudioBufferSize         = AUDIOBUFFERLENGTH;
m_CapParms.AVStreamMaster            = AVSTREAMMASTER_AUDIO;
m_CapParms.vKeyAbort  = 'S';
m_CapParms.fYield  = TRUE;

    capCaptureSetSetup(m_hWndCap, &m_CapParms, sizeof(CAPTUREPARMS)) ;

WAVEFORMATEX wfex;

wfex.wFormatTag  = WAVE_FORMAT_PCM;
wfex.nChannels  = 1;             
wfex.nSamplesPerSec  = 11025;
wfex.nAvgBytesPerSec = 11025;
wfex.nBlockAlign     = 1;
wfex.wBitsPerSample  = 8;
wfex.cbSize  = 0;

capSetAudioFormat(m_hWndCap, &wfex, sizeof(WAVEFORMATEX)); 

    hMenu = GetSubMenu(::GetMenu(GetParent()->GetSafeHwnd()), 2) ;

// capSetCallbackOnError(m_hWndCap, ErrorCallbackProc) ;
// capSetCallbackOnStatus(m_hWndCap, StatusCallbackProc) ;
capSetCallbackOnVideoStream(m_hWndCap, VideoCallbackProc) ;
capSetCallbackOnFrame(m_hWndCap, FrameCallbackProc) ;
capSetCallbackOnWaveStream(m_hWndCap, WaveStreamCallback); if (capGetDriverDescription(0, (LPTSTR)achDeviceName, sizeof(achDeviceName)/ sizeof(TCHAR),
                           (LPTSTR)achDeviceVersion, sizeof(achDeviceVersion)/sizeof(TCHAR))) 
{
csBuffer.Format("&%d %s", 0 , achDeviceName) ;
// AppendMenu(hMenu, MF_ENABLED, IDM_O_DRIVERS, csBuffer) ;
dwError = capDriverConnect(m_hWndCap, 0);
// if (dwError) 
// {
// CheckMenuItem(::GetMenu(GetParent()->GetSafeHwnd()), IDM_O_DRIVERS, MF_BYCOMMAND | MF_CHECKED) ;
// }
}

capSetVideoFormat(m_hWndCap,&m_InbmpInfoHeader,sizeof(BITMAPINFOHEADER));

    DrawMenuBar() ;
    CenterCaptureWindow(m_hWndCap) ;
    StartNewVideoChannel(m_hWndCap, 0) ;