DH>//------------------------------------------------------------------------------
DH>// File: GrabBitmaps.cpp
DH>//
DH>// Desc: DirectShow sample code - GrabBitmaps sample
DH>//       This console app will open a long AVI file in the parent directory,
DH>//       create a filter graph with a sample grabber filter,
DH>//       read frames out of it every second for a few seconds, 
DH>//       and write the frames to BMP files in the current directory.
DH>//
DH>// Copyright (c) Microsoft Corporation.  All rights reserved.
DH>//------------------------------------------------------------------------------

DH>#include <windows.h>
DH>#include <streams.h>
DH>#include <stdio.h>
DH>#include <atlbase.h>
DH>#include <qedit.h>

DH>// Function prototypes
DH>int GrabBitmaps(TCHAR * szFile);
DH>HRESULT GetPin(IBaseFilter * pFilter, PIN_DIRECTION dirrequired,  int iNum, IPin **ppPin);
DH>IPin *  GetInPin ( IBaseFilter *pFilter, int Num );
DH>IPin *  GetOutPin( IBaseFilter *pFilter, int Num );

DH>// Constants
DH>#define NUM_FRAMES_TO_GRAB  5000


DH>//
DH>// Implementation of CSampleGrabberCB object
DH>//
DH>// Note: this object is a SEMI-COM object, and can only be created statically.

DH>class CSampleGrabberCB : public ISampleGrabberCB 
DH>{

DH>public:

DH>    // These will get set by the main thread below. We need to
DH>    // know this in order to write out the bmp
DH>    long Width;
DH>    long Height;

DH>    // Fake out any COM ref counting
DH>    //
DH>    STDMETHODIMP_(ULONG) AddRef() { return 2; }
DH>    STDMETHODIMP_(ULONG) Release() { return 1; }

DH>    // Fake out any COM QI'ing
DH>    //
DH>    STDMETHODIMP QueryInterface(REFIID riid, void ** ppv)
DH>    {
DH>        CheckPointer(ppv,E_POINTER);
        
DH>        if( riid == IID_ISampleGrabberCB || riid == IID_IUnknown ) 
DH>        {
DH>            *ppv = (void *) static_cast<ISampleGrabberCB*> ( this );
DH>            return NOERROR;
DH>        }    

DH>        return E_NOINTERFACE;
DH>    }


DH>    // We don't implement this one
DH>    //
DH>    STDMETHODIMP SampleCB( double SampleTime, IMediaSample * pSample )
DH>    {
DH>        return 0;
DH>    }


DH>    // The sample grabber is calling us back on its deliver thread.
DH>    // This is NOT the main app thread!
DH>    //
DH>    STDMETHODIMP BufferCB( double SampleTime, BYTE * pBuffer, long BufferSize )
DH>    {
DH>        //
DH>        // Convert the buffer into a bitmap
DH>        //
DH>        TCHAR szFilename[MAX_PATH];
DH>        wsprintf(szFilename, TEXT("Bitmap%5.5ld.bmp\0"), long( SampleTime * 1000 ) );

............................................................................................
DH>        return 0;
DH>    }
DH>};


DH>//
DH>// Main program code
DH>//
DH>int _tmain(int argc, TCHAR* argv[])
DH>{
DH>    if( argc != 2 || !argv || !argv[1] )
DH>    {
DH>        _tprintf( TEXT("GrabBitmaps: You must specify a media filename!\r\n") );
DH>        _tprintf( TEXT("Usage: GrabBitmaps Filename\r\n"));
DH>        return 0;
DH>    }

DH>    CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);

...................................................
DH>    // Find a limited number of frames
DH>    //
DH>    for( int i = 0 ; i < NUM_FRAMES_TO_GRAB ; i++ )
DH>    {
DH>        // set position
DH>        REFERENCE_TIME Start = i * UNITS;
DH>        hr = pSeeking->SetPositions( &Start, AM_SEEKING_AbsolutePositioning, 
DH>                                     NULL, AM_SEEKING_NoPositioning );

DH>        // activate the threads
DH>        CComQIPtr< IMediaControl, &IID_IMediaControl > pControl( pGraph );
DH>        hr = pControl->Run( );

DH>        // wait for the graph to settle
DH>        CComQIPtr< IMediaEvent, &IID_IMediaEvent > pEvent( pGraph );
DH>        long EvCode = 0;

DH>        hr = pEvent->WaitForCompletion( INFINITE, &EvCode );
        
DH>        // callback wrote the sample
DH>    }

DH>    _tprintf(TEXT("Sample grabbing complete.\r\n"));
DH>    return 0;
DH>}

...............................................................
DH>

DH>//------------------------------------------------------------------------------
DH>// File: GrabBitmaps.cpp
DH>//
DH>// Desc: DirectShow sample code - GrabBitmaps sample
DH>//       This console app will open a long AVI file in the parent directory,
DH>//       create a filter graph with a sample grabber filter,
DH>//       read frames out of it every second for a few seconds, 
DH>//       and write the frames to BMP files in the current directory.
DH>//
DH>// Copyright (c) Microsoft Corporation.  All rights reserved.
DH>//------------------------------------------------------------------------------

...................................................................................

DH>

DH>>//------------------------------------------------------------------------------
DH>>// File: GrabBitmaps.cpp
DH>>//
DH>>//
DH>>// Desc: DirectShow sample code - GrabBitmaps sample
DH>>//       This console app will open a long AVI file in the parent directory,
DH>>//       create a filter graph with a sample grabber filter,
DH>>//       read frames out of it every second for a few seconds, 
DH>>//       and write the frames to BMP files in the current directory.
DH>>//
DH>>// Copyright (c) Microsoft Corporation.  All rights reserved.
DH>>//------------------------------------------------------------------------------

SD>...................................................................................

DH>>