Camera Control needed for Tablet

Re: Camera Control needed for Tablet

Postby rhlawek » Thu Aug 25, 2016 5:39 pm

Antonio, on a device with 2 or more cameras do you know how to select which camera to use?
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Re: Camera Control needed for Tablet

Postby TimStone » Thu Aug 25, 2016 5:44 pm

OK ... so I finally got it to build and work. There are a couple of warnings but we can do that later.

I see we are first accessing the webcam. Ultimately, what I need is to have it open in snapshot mode. My clients will be saving photos of parts and vehicles that they will be looking at within the program.
Tim Stone
http://www.MasterLinkSoftware.com
http://www.autoshopwriter.com
timstone@masterlinksoftware.com
Using: FWH 23.10 with Harbour 3.2.0 / Microsoft Visual Studio Community 2022-24 32/64 bit
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Location: Trabuco Canyon, CA USA

Re: Camera Control needed for Tablet

Postby Antonio Linares » Thu Aug 25, 2016 5:48 pm

Then we make it a true FWH control ;-)

Click over the camera display!

Code: Select all  Expand view  RUN
#include "FiveWin.ch"

#define GWL_STYLE -16

function Main()

   local oWnd, hWnd, oCamera
   
   DEFINE WINDOW oWnd

   oCamera = TControl()
   
   oCamera:bLClicked = { || MsgInfo( "click" ) }

   ACTIVATE WINDOW oWnd MAXIMIZED ;
      ON INIT ( DShowCamera(),;
                SetParent( hWnd := FindWindow( 0, "ActiveMovie Window" ), oWnd:hWnd ),;
                SetWindowLong( hWnd, GWL_STYLE, nOr( WS_CHILD, WS_VISIBLE ) ),;
                SetWindowPos( hWnd, 0, 10, 10, 300, 300 ),;
                oCamera:oWnd := oWnd, oCamera:hWnd := hWnd, oCamera:Link() )

return nil

#pragma BEGINDUMP

#include <dshow.h>
#include <uuids.h>
#include <objbase.h>

#import "qedit.dll" raw_interfaces_only named_guids

EXTERN_C const CLSID CLSID_NullRenderer;
EXTERN_C const CLSID CLSID_SampleGrabber;

HB_FUNC( DSHOWCAMERA )
{
   HRESULT hr;
   ICreateDevEnum *pDevEnum = NULL;
   IEnumMoniker *pEnum = NULL;
   IMoniker *pMoniker = NULL;
   IPropertyBag *pPropBag = NULL;
   IGraphBuilder *pGraph = NULL;
   ICaptureGraphBuilder2 *pBuilder = NULL;
   IBaseFilter *pCap = NULL;
   IBaseFilter *pSampleGrabberFilter = NULL;
   IBaseFilter *pNullRenderer = NULL;
   IMediaControl *pMediaControl = NULL;
   char *pBuffer = NULL;
   VARIANT var;
    int n = 0;
    int device_number = 0;
    char device_name[ 100 ];
   char char_buffer[100];
   DexterLib::ISampleGrabber *pSampleGrabber = NULL;

   strcpy( device_name, "" );

   hr = CoInitializeEx( NULL, COINIT_MULTITHREADED );

   if( hr != S_OK )
      MessageBox( 0, "CoInitializeEx error", "ok", 0 );

   hr = CoCreateInstance( CLSID_FilterGraph, NULL,
              CLSCTX_INPROC_SERVER, IID_IGraphBuilder,
              ( void ** ) &pGraph );
           
   if( hr != S_OK )
      MessageBox( 0, "CoCreateInstance error", "ok", 0 );
     
    hr = CoCreateInstance( CLSID_CaptureGraphBuilder2, NULL,
            CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2,
            ( void ** ) &pBuilder );      

   if( hr != S_OK )
      MessageBox( 0, "CoCreateInstance 2 error", "ok", 0 );

    hr = ( ( ICaptureGraphBuilder * ) pBuilder )->SetFiltergraph( pGraph );
   
    if( hr != S_OK )
        MessageBox( 0, "Could not attach capture graph builder to graph", "ok", 0 );
     
    hr = CoCreateInstance( CLSID_SystemDeviceEnum, NULL,
            CLSCTX_INPROC_SERVER, IID_PPV_ARGS( &pDevEnum ) );
         
    if( hr != S_OK )
        MessageBox( 0, "Could not crerate system device enumerator", "ok", 0 );
     
    hr = pDevEnum->CreateClassEnumerator(
                    CLSID_VideoInputDeviceCategory, &pEnum, 0 );
               
    if( hr != S_OK )
        MessageBox( 0, "No video devices found", "ok", 0 );      
     
    while(1)
    {
        // Access next device
        hr = pEnum->Next(1, &pMoniker, NULL);
        if( hr == S_OK )
            n++; // increment device count
      else  
         break;
       
        // If device was specified by name rather than number...
        if( device_number == 0 )
        {
            // Get video input device name
            hr = pMoniker->BindToStorage(0, 0, IID_PPV_ARGS(&pPropBag));
            if (hr == S_OK)
            {
                // Get current device name
                VariantInit(&var);
                hr = pPropBag->Read(L"FriendlyName", &var, 0);
               
                // Convert to a normal C string, i.e. char*
                sprintf(char_buffer, "%ls", var.bstrVal);
                VariantClear(&var);
                pPropBag->Release();
                pPropBag = NULL;
               
                // Exit loop if current device name matched devname
            // MessageBox( 0, char_buffer, "device_name", 0 );
           
                if (strcmp(device_name, char_buffer) == 0) break;
            }
            else
         {
                MessageBox( 0, "Error getting device names", "ok", 0 );
            break;
         }  
        }
        else if (n >= device_number) break;
    }  
   
    // Get video input device name
    hr = pMoniker->BindToStorage(0, 0, IID_PPV_ARGS(&pPropBag));
    VariantInit(&var);
    hr = pPropBag->Read(L"FriendlyName", &var, 0);
    // MessageBoxW( 0, L"Capture device", var.bstrVal, 0 );
    VariantClear(&var);  
   
    // Create capture filter and add to graph
    hr = pMoniker->BindToObject(0, 0,
                    IID_IBaseFilter, (void**)&pCap);
               
    if( hr != S_OK )
      MessageBox( 0, "Could not create capture filter", "ok", 0 );  

    // Add capture filter to graph
    hr = pGraph->AddFilter(pCap, L"Capture Filter");
   
    if( hr != S_OK )
      MessageBox( 0, "Could not add capture filter to graph", "ok", 0 );

    // Create sample grabber filter
    hr = CoCreateInstance(CLSID_SampleGrabber, NULL,
        CLSCTX_INPROC_SERVER, IID_IBaseFilter,
        (void**)&pSampleGrabberFilter);
     
    if( hr != S_OK )
        MessageBox( 0, "Could not create Sample Grabber filter", "ok", 0 );

    // Query the ISampleGrabber interface of the sample grabber filter
    hr = pSampleGrabberFilter->QueryInterface(
            DexterLib::IID_ISampleGrabber, (void**)&pSampleGrabber);
         
    if( hr != S_OK )
        MessageBox( 0, "Could not get ISampleGrabber interface to sample grabber filter", "ok", 0 );

    // Enable sample buffering in the sample grabber filter
    hr = pSampleGrabber->SetBufferSamples(TRUE);
   
    if( hr != S_OK )
        MessageBox( 0, "Could not enable sample buffering in the sample grabber", "ok", 0 );

    // Set media type in sample grabber filter
    AM_MEDIA_TYPE mt;
    ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE));
    mt.majortype = MEDIATYPE_Video;
    mt.subtype = MEDIASUBTYPE_RGB24;
    hr = pSampleGrabber->SetMediaType((DexterLib::_AMMediaType *)&mt);
   
    if( hr != S_OK )
        MessageBox( 0, "Could not set media type in sample grabber", "ok", 0 );

    // Add sample grabber filter to filter graph
    hr = pGraph->AddFilter(pSampleGrabberFilter, L"SampleGrab");
   
    if( hr != S_OK )
        MessageBox( 0, "Could not add Sample Grabber to filter graph", "ok", 0 );

    // Create Null Renderer filter
    hr = CoCreateInstance(CLSID_NullRenderer, NULL,
        CLSCTX_INPROC_SERVER, IID_IBaseFilter,
        (void**)&pNullRenderer);

   if( hr != S_OK )
        MessageBox( 0, "Could not create Null Renderer filter", "ok", 0 );

    // Add Null Renderer filter to filter graph
    hr = pGraph->AddFilter(pNullRenderer, L"NullRender");

   if( hr != S_OK )
        MessageBox( 0, "Could not add Null Renderer to filter graph", "ok", 0 );
     
   // Connect up the filter graph's capture stream
    hr = pBuilder->RenderStream(
        &PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video,
        pCap,  pSampleGrabberFilter, pNullRenderer);
     
    if( hr != S_OK )
        MessageBox( 0, "Could not render capture video stream", "ok", 0 );

    hr = pBuilder->RenderStream(
                &PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video,
                pCap, NULL, NULL);
   
   if (hr != S_OK && hr != VFW_S_NOPREVIEWPIN)
            MessageBox( 0, "Could not render preview video stream", "ok", 0 );

    // Get media control interfaces to graph builder object
    hr = pGraph->QueryInterface(IID_IMediaControl,
                    (void**)&pMediaControl);

   if( hr != S_OK )
      MessageBox( 0, "Could not get media control interface", "ok", 0 );

    // Run graph
    while(1)
    {
        hr = pMediaControl->Run();
       
        // Hopefully, the return value was S_OK or S_FALSE
        if (hr == S_OK) break; // graph is now running
        if (hr == S_FALSE) continue; // graph still preparing to run
       
        // If the Run function returned something else,
        // there must be a problem
        // fprintf(stderr, "Error: %u\n", hr);
        MessageBox( 0, "Could not run filter graph", "ok", 0 );
    }
}

#pragma ENDDUMP
regards, saludos

Antonio Linares
www.fivetechsoft.com
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Posts: 42148
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Location: Spain

Re: Camera Control needed for Tablet

Postby rhlawek » Thu Aug 25, 2016 5:57 pm

Never mind on camera selection, it is a simple as changing the device number. So my next question is how to enumerate all available cameras.
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Posts: 194
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Re: Camera Control needed for Tablet

Postby Antonio Linares » Thu Aug 25, 2016 6:00 pm

Now you can click on it to stop it and record again, alternatively:

dshow.prg
Code: Select all  Expand view  RUN
#include "FiveWin.ch"

#define GWL_STYLE -16

function Main()

   local oWnd, hWnd, oCamera, pMediaControl
   local lStop := .F.
   
   DEFINE WINDOW oWnd

   oCamera = TControl()
   
   oCamera:bLClicked = { || If( ! lStop,;
                            DShowStop( pMediaControl ), DShowPlay( pMediaControl ) ),;
                            lStop := ! lStop }

   ACTIVATE WINDOW oWnd MAXIMIZED ;
      ON INIT ( pMediaControl := DShowCamera(),;
                SetParent( hWnd := FindWindow( 0, "ActiveMovie Window" ), oWnd:hWnd ),;
                SetWindowLong( hWnd, GWL_STYLE, nOr( WS_CHILD, WS_VISIBLE ) ),;
                SetWindowPos( hWnd, 0, 10, 10, 300, 300 ),;
                oCamera:oWnd := oWnd, oCamera:hWnd := hWnd, oCamera:Link() )

return nil

#pragma BEGINDUMP

#include <hbapi.h>
#include <dshow.h>
#include <uuids.h>
#include <objbase.h>

#import "qedit.dll" raw_interfaces_only named_guids

EXTERN_C const CLSID CLSID_NullRenderer;
EXTERN_C const CLSID CLSID_SampleGrabber;

HB_FUNC( DSHOWPLAY )
{
   IMediaControl * pMediaControl = ( IMediaControl * ) hb_parnll( 1 );

   pMediaControl->Run();
}  

HB_FUNC( DSHOWSTOP )
{
   IMediaControl * pMediaControl = ( IMediaControl * ) hb_parnll( 1 );

   pMediaControl->Stop();
}  

HB_FUNC( DSHOWCAMERA )
{
   HRESULT hr;
   ICreateDevEnum *pDevEnum = NULL;
   IEnumMoniker *pEnum = NULL;
   IMoniker *pMoniker = NULL;
   IPropertyBag *pPropBag = NULL;
   IGraphBuilder *pGraph = NULL;
   ICaptureGraphBuilder2 *pBuilder = NULL;
   IBaseFilter *pCap = NULL;
   IBaseFilter *pSampleGrabberFilter = NULL;
   IBaseFilter *pNullRenderer = NULL;
   IMediaControl *pMediaControl = NULL;
   char *pBuffer = NULL;
   VARIANT var;
    int n = 0;
    int device_number = 0;
    char device_name[ 100 ];
   char char_buffer[100];
   DexterLib::ISampleGrabber *pSampleGrabber = NULL;

   strcpy( device_name, "" );

   hr = CoInitializeEx( NULL, COINIT_MULTITHREADED );

   if( hr != S_OK )
      MessageBox( 0, "CoInitializeEx error", "ok", 0 );

   hr = CoCreateInstance( CLSID_FilterGraph, NULL,
              CLSCTX_INPROC_SERVER, IID_IGraphBuilder,
              ( void ** ) &pGraph );
           
   if( hr != S_OK )
      MessageBox( 0, "CoCreateInstance error", "ok", 0 );
     
    hr = CoCreateInstance( CLSID_CaptureGraphBuilder2, NULL,
            CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2,
            ( void ** ) &pBuilder );      

   if( hr != S_OK )
      MessageBox( 0, "CoCreateInstance 2 error", "ok", 0 );

    hr = ( ( ICaptureGraphBuilder * ) pBuilder )->SetFiltergraph( pGraph );
   
    if( hr != S_OK )
        MessageBox( 0, "Could not attach capture graph builder to graph", "ok", 0 );
     
    hr = CoCreateInstance( CLSID_SystemDeviceEnum, NULL,
            CLSCTX_INPROC_SERVER, IID_PPV_ARGS( &pDevEnum ) );
         
    if( hr != S_OK )
        MessageBox( 0, "Could not crerate system device enumerator", "ok", 0 );
     
    hr = pDevEnum->CreateClassEnumerator(
                    CLSID_VideoInputDeviceCategory, &pEnum, 0 );
               
    if( hr != S_OK )
        MessageBox( 0, "No video devices found", "ok", 0 );      
     
    while(1)
    {
        // Access next device
        hr = pEnum->Next(1, &pMoniker, NULL);
        if( hr == S_OK )
            n++; // increment device count
      else  
         break;
       
        // If device was specified by name rather than number...
        if( device_number == 0 )
        {
            // Get video input device name
            hr = pMoniker->BindToStorage(0, 0, IID_PPV_ARGS(&pPropBag));
            if (hr == S_OK)
            {
                // Get current device name
                VariantInit(&var);
                hr = pPropBag->Read(L"FriendlyName", &var, 0);
               
                // Convert to a normal C string, i.e. char*
                sprintf(char_buffer, "%ls", var.bstrVal);
                VariantClear(&var);
                pPropBag->Release();
                pPropBag = NULL;
               
                // Exit loop if current device name matched devname
            // MessageBox( 0, char_buffer, "device_name", 0 );
           
                if (strcmp(device_name, char_buffer) == 0) break;
            }
            else
         {
                MessageBox( 0, "Error getting device names", "ok", 0 );
            break;
         }  
        }
        else if (n >= device_number) break;
    }  
   
    // Get video input device name
    hr = pMoniker->BindToStorage(0, 0, IID_PPV_ARGS(&pPropBag));
    VariantInit(&var);
    hr = pPropBag->Read(L"FriendlyName", &var, 0);
    // MessageBoxW( 0, L"Capture device", var.bstrVal, 0 );
    VariantClear(&var);  
   
    // Create capture filter and add to graph
    hr = pMoniker->BindToObject(0, 0,
                    IID_IBaseFilter, (void**)&pCap);
               
    if( hr != S_OK )
      MessageBox( 0, "Could not create capture filter", "ok", 0 );  

    // Add capture filter to graph
    hr = pGraph->AddFilter(pCap, L"Capture Filter");
   
    if( hr != S_OK )
      MessageBox( 0, "Could not add capture filter to graph", "ok", 0 );

    // Create sample grabber filter
    hr = CoCreateInstance(CLSID_SampleGrabber, NULL,
        CLSCTX_INPROC_SERVER, IID_IBaseFilter,
        (void**)&pSampleGrabberFilter);
     
    if( hr != S_OK )
        MessageBox( 0, "Could not create Sample Grabber filter", "ok", 0 );

    // Query the ISampleGrabber interface of the sample grabber filter
    hr = pSampleGrabberFilter->QueryInterface(
            DexterLib::IID_ISampleGrabber, (void**)&pSampleGrabber);
         
    if( hr != S_OK )
        MessageBox( 0, "Could not get ISampleGrabber interface to sample grabber filter", "ok", 0 );

    // Enable sample buffering in the sample grabber filter
    hr = pSampleGrabber->SetBufferSamples(TRUE);
   
    if( hr != S_OK )
        MessageBox( 0, "Could not enable sample buffering in the sample grabber", "ok", 0 );

    // Set media type in sample grabber filter
    AM_MEDIA_TYPE mt;
    ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE));
    mt.majortype = MEDIATYPE_Video;
    mt.subtype = MEDIASUBTYPE_RGB24;
    hr = pSampleGrabber->SetMediaType((DexterLib::_AMMediaType *)&mt);
   
    if( hr != S_OK )
        MessageBox( 0, "Could not set media type in sample grabber", "ok", 0 );

    // Add sample grabber filter to filter graph
    hr = pGraph->AddFilter(pSampleGrabberFilter, L"SampleGrab");
   
    if( hr != S_OK )
        MessageBox( 0, "Could not add Sample Grabber to filter graph", "ok", 0 );

    // Create Null Renderer filter
    hr = CoCreateInstance(CLSID_NullRenderer, NULL,
        CLSCTX_INPROC_SERVER, IID_IBaseFilter,
        (void**)&pNullRenderer);

   if( hr != S_OK )
        MessageBox( 0, "Could not create Null Renderer filter", "ok", 0 );

    // Add Null Renderer filter to filter graph
    hr = pGraph->AddFilter(pNullRenderer, L"NullRender");

   if( hr != S_OK )
        MessageBox( 0, "Could not add Null Renderer to filter graph", "ok", 0 );
     
   // Connect up the filter graph's capture stream
    hr = pBuilder->RenderStream(
        &PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video,
        pCap,  pSampleGrabberFilter, pNullRenderer);
     
    if( hr != S_OK )
        MessageBox( 0, "Could not render capture video stream", "ok", 0 );

    hr = pBuilder->RenderStream(
                &PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video,
                pCap, NULL, NULL);
   
   if (hr != S_OK && hr != VFW_S_NOPREVIEWPIN)
            MessageBox( 0, "Could not render preview video stream", "ok", 0 );

    // Get media control interfaces to graph builder object
    hr = pGraph->QueryInterface(IID_IMediaControl,
                    (void**)&pMediaControl);

   if( hr != S_OK )
      MessageBox( 0, "Could not get media control interface", "ok", 0 );

    // Run graph
    while(1)
    {
        hr = pMediaControl->Run();
       
        // Hopefully, the return value was S_OK or S_FALSE
        if (hr == S_OK) break; // graph is now running
        if (hr == S_FALSE) continue; // graph still preparing to run
       
        // If the Run function returned something else,
        // there must be a problem
        // fprintf(stderr, "Error: %u\n", hr);
        MessageBox( 0, "Could not run filter graph", "ok", 0 );
    }
   
   hb_retnll( ( HB_LONGLONG ) pMediaControl );
}

#pragma ENDDUMP
regards, saludos

Antonio Linares
www.fivetechsoft.com
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Posts: 42148
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Re: Camera Control needed for Tablet

Postby TimStone » Thu Aug 25, 2016 6:01 pm

Once again too many errors to compile this latest version. It seems a "select all" and copy of the code from the forum is adding some foreign characters. The downloaded .prg worked fine.

Tim
Tim Stone
http://www.MasterLinkSoftware.com
http://www.autoshopwriter.com
timstone@masterlinksoftware.com
Using: FWH 23.10 with Harbour 3.2.0 / Microsoft Visual Studio Community 2022-24 32/64 bit
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Location: Trabuco Canyon, CA USA

Re: Camera Control needed for Tablet

Postby Antonio Linares » Thu Aug 25, 2016 6:03 pm

Robb,

This code seem to do what you want:

Code: Select all  Expand view  RUN
    // If the user has included the "/list" command line
    // argument, just list available devices, then exit.
    if (list_devices != 0)
    {
        fprintf(stderr, "Available capture devices:\n");
        n = 0;
        while(1)
        {
            // Find next device
            hr = pEnum->Next(1, &pMoniker, NULL);
            if (hr == S_OK)
            {
                // Increment device counter
                n++;
               
                // Get device name
                hr = pMoniker->BindToStorage(0, 0, IID_PPV_ARGS(&pPropBag));
                VARIANT var;
                VariantInit(&var);
                hr = pPropBag->Read(L"FriendlyName", &var, 0);
                fprintf(stderr, "  %d. %ls\n", n, var.bstrVal);
                VariantClear(&var);
            }
            else
            {
                // Finished listing device, so exit program
                if (n == 0) exit_message("No devices found", 0);
                else exit_message("", 0);
            }
        }
    }
regards, saludos

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Posts: 42148
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Re: Camera Control needed for Tablet

Postby Antonio Linares » Thu Aug 25, 2016 6:05 pm

regards, saludos

Antonio Linares
www.fivetechsoft.com
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Antonio Linares
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Re: Camera Control needed for Tablet

Postby Antonio Linares » Thu Aug 25, 2016 6:22 pm

This version allows to take as many photos as wanted ;-)

dshow.prg
Code: Select all  Expand view  RUN
#include "FiveWin.ch"

#define GWL_STYLE -16

function Main()

   local oWnd, hWnd, oCamera, pMediaControl
   
   DEFINE WINDOW oWnd

   oCamera = TControl()
   
   oCamera:bLClicked = { || DShowStop( pMediaControl ), TakePhoto( oCamera ),;
                            DShowPlay( pMediaControl ) }

   ACTIVATE WINDOW oWnd MAXIMIZED ;
      ON INIT ( pMediaControl := DShowCamera(),;
                SetParent( hWnd := FindWindow( 0, "ActiveMovie Window" ), oWnd:hWnd ),;
                SetWindowLong( hWnd, GWL_STYLE, nOr( WS_CHILD, WS_VISIBLE ) ),;
                SetWindowPos( hWnd, 0, 15, 15, 300, 300 ),;
                oCamera:oWnd := oWnd, oCamera:hWnd := hWnd, oCamera:Link() )

return nil

function TakePhoto( oCamera )

   static oBmp

   oCamera:SaveToBmp( "photo.bmp" )
   
   if oBmp == nil
      @ 1, 60 BITMAP oBmp OF oCamera:oWnd FILENAME "photo.bmp"
   else  
      oBmp:LoadImage( , "photo.bmp" )
      oBmp:Refresh()
   endif  

return nil  

#pragma BEGINDUMP

#include <hbapi.h>
#include <dshow.h>
#include <uuids.h>
#include <objbase.h>

#import "qedit.dll" raw_interfaces_only named_guids

EXTERN_C const CLSID CLSID_NullRenderer;
EXTERN_C const CLSID CLSID_SampleGrabber;

HB_FUNC( DSHOWPLAY )
{
   IMediaControl * pMediaControl = ( IMediaControl * ) hb_parnll( 1 );

   pMediaControl->Run();
}  

HB_FUNC( DSHOWSTOP )
{
   IMediaControl * pMediaControl = ( IMediaControl * ) hb_parnll( 1 );

   pMediaControl->Stop();
}  

HB_FUNC( DSHOWCAMERA )
{
   HRESULT hr;
   ICreateDevEnum *pDevEnum = NULL;
   IEnumMoniker *pEnum = NULL;
   IMoniker *pMoniker = NULL;
   IPropertyBag *pPropBag = NULL;
   IGraphBuilder *pGraph = NULL;
   ICaptureGraphBuilder2 *pBuilder = NULL;
   IBaseFilter *pCap = NULL;
   IBaseFilter *pSampleGrabberFilter = NULL;
   IBaseFilter *pNullRenderer = NULL;
   IMediaControl *pMediaControl = NULL;
   char *pBuffer = NULL;
   VARIANT var;
    int n = 0;
    int device_number = 0;
    char device_name[ 100 ];
   char char_buffer[100];
   DexterLib::ISampleGrabber *pSampleGrabber = NULL;

   strcpy( device_name, "" );

   hr = CoInitializeEx( NULL, COINIT_MULTITHREADED );

   if( hr != S_OK )
      MessageBox( 0, "CoInitializeEx error", "ok", 0 );

   hr = CoCreateInstance( CLSID_FilterGraph, NULL,
              CLSCTX_INPROC_SERVER, IID_IGraphBuilder,
              ( void ** ) &pGraph );
           
   if( hr != S_OK )
      MessageBox( 0, "CoCreateInstance error", "ok", 0 );
     
    hr = CoCreateInstance( CLSID_CaptureGraphBuilder2, NULL,
            CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2,
            ( void ** ) &pBuilder );      

   if( hr != S_OK )
      MessageBox( 0, "CoCreateInstance 2 error", "ok", 0 );

    hr = ( ( ICaptureGraphBuilder * ) pBuilder )->SetFiltergraph( pGraph );
   
    if( hr != S_OK )
        MessageBox( 0, "Could not attach capture graph builder to graph", "ok", 0 );
     
    hr = CoCreateInstance( CLSID_SystemDeviceEnum, NULL,
            CLSCTX_INPROC_SERVER, IID_PPV_ARGS( &pDevEnum ) );
         
    if( hr != S_OK )
        MessageBox( 0, "Could not crerate system device enumerator", "ok", 0 );
     
    hr = pDevEnum->CreateClassEnumerator(
                    CLSID_VideoInputDeviceCategory, &pEnum, 0 );
               
    if( hr != S_OK )
        MessageBox( 0, "No video devices found", "ok", 0 );      
     
    while(1)
    {
        // Access next device
        hr = pEnum->Next(1, &pMoniker, NULL);
        if( hr == S_OK )
            n++; // increment device count
      else  
         break;
       
        // If device was specified by name rather than number...
        if( device_number == 0 )
        {
            // Get video input device name
            hr = pMoniker->BindToStorage(0, 0, IID_PPV_ARGS(&pPropBag));
            if (hr == S_OK)
            {
                // Get current device name
                VariantInit(&var);
                hr = pPropBag->Read(L"FriendlyName", &var, 0);
               
                // Convert to a normal C string, i.e. char*
                sprintf(char_buffer, "%ls", var.bstrVal);
                VariantClear(&var);
                pPropBag->Release();
                pPropBag = NULL;
               
                // Exit loop if current device name matched devname
            // MessageBox( 0, char_buffer, "device_name", 0 );
           
                if (strcmp(device_name, char_buffer) == 0) break;
            }
            else
         {
                MessageBox( 0, "Error getting device names", "ok", 0 );
            break;
         }  
        }
        else if (n >= device_number) break;
    }  
   
    // Get video input device name
    hr = pMoniker->BindToStorage(0, 0, IID_PPV_ARGS(&pPropBag));
    VariantInit(&var);
    hr = pPropBag->Read(L"FriendlyName", &var, 0);
    // MessageBoxW( 0, L"Capture device", var.bstrVal, 0 );
    VariantClear(&var);  
   
    // Create capture filter and add to graph
    hr = pMoniker->BindToObject(0, 0,
                    IID_IBaseFilter, (void**)&pCap);
               
    if( hr != S_OK )
      MessageBox( 0, "Could not create capture filter", "ok", 0 );  

    // Add capture filter to graph
    hr = pGraph->AddFilter(pCap, L"Capture Filter");
   
    if( hr != S_OK )
      MessageBox( 0, "Could not add capture filter to graph", "ok", 0 );

    // Create sample grabber filter
    hr = CoCreateInstance(CLSID_SampleGrabber, NULL,
        CLSCTX_INPROC_SERVER, IID_IBaseFilter,
        (void**)&pSampleGrabberFilter);
     
    if( hr != S_OK )
        MessageBox( 0, "Could not create Sample Grabber filter", "ok", 0 );

    // Query the ISampleGrabber interface of the sample grabber filter
    hr = pSampleGrabberFilter->QueryInterface(
            DexterLib::IID_ISampleGrabber, (void**)&pSampleGrabber);
         
    if( hr != S_OK )
        MessageBox( 0, "Could not get ISampleGrabber interface to sample grabber filter", "ok", 0 );

    // Enable sample buffering in the sample grabber filter
    hr = pSampleGrabber->SetBufferSamples(TRUE);
   
    if( hr != S_OK )
        MessageBox( 0, "Could not enable sample buffering in the sample grabber", "ok", 0 );

    // Set media type in sample grabber filter
    AM_MEDIA_TYPE mt;
    ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE));
    mt.majortype = MEDIATYPE_Video;
    mt.subtype = MEDIASUBTYPE_RGB24;
    hr = pSampleGrabber->SetMediaType((DexterLib::_AMMediaType *)&mt);
   
    if( hr != S_OK )
        MessageBox( 0, "Could not set media type in sample grabber", "ok", 0 );

    // Add sample grabber filter to filter graph
    hr = pGraph->AddFilter(pSampleGrabberFilter, L"SampleGrab");
   
    if( hr != S_OK )
        MessageBox( 0, "Could not add Sample Grabber to filter graph", "ok", 0 );

    // Create Null Renderer filter
    hr = CoCreateInstance(CLSID_NullRenderer, NULL,
        CLSCTX_INPROC_SERVER, IID_IBaseFilter,
        (void**)&pNullRenderer);

   if( hr != S_OK )
        MessageBox( 0, "Could not create Null Renderer filter", "ok", 0 );

    // Add Null Renderer filter to filter graph
    hr = pGraph->AddFilter(pNullRenderer, L"NullRender");

   if( hr != S_OK )
        MessageBox( 0, "Could not add Null Renderer to filter graph", "ok", 0 );
     
   // Connect up the filter graph's capture stream
    hr = pBuilder->RenderStream(
        &PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video,
        pCap,  pSampleGrabberFilter, pNullRenderer);
     
    if( hr != S_OK )
        MessageBox( 0, "Could not render capture video stream", "ok", 0 );

    hr = pBuilder->RenderStream(
                &PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video,
                pCap, NULL, NULL);
   
   if (hr != S_OK && hr != VFW_S_NOPREVIEWPIN)
            MessageBox( 0, "Could not render preview video stream", "ok", 0 );

    // Get media control interfaces to graph builder object
    hr = pGraph->QueryInterface(IID_IMediaControl,
                    (void**)&pMediaControl);

   if( hr != S_OK )
      MessageBox( 0, "Could not get media control interface", "ok", 0 );

    // Run graph
    while(1)
    {
        hr = pMediaControl->Run();
       
        // Hopefully, the return value was S_OK or S_FALSE
        if (hr == S_OK) break; // graph is now running
        if (hr == S_FALSE) continue; // graph still preparing to run
       
        // If the Run function returned something else,
        // there must be a problem
        // fprintf(stderr, "Error: %u\n", hr);
        MessageBox( 0, "Could not run filter graph", "ok", 0 );
    }
   
   hb_retnll( ( HB_LONGLONG ) pMediaControl );
}

#pragma ENDDUMP
regards, saludos

Antonio Linares
www.fivetechsoft.com
User avatar
Antonio Linares
Site Admin
 
Posts: 42148
Joined: Thu Oct 06, 2005 5:47 pm
Location: Spain

Re: Camera Control needed for Tablet

Postby Antonio Linares » Thu Aug 25, 2016 6:24 pm

We don't need to stop the camera to take the photo, so we can simply do:

oCamera:bLClicked = { || TakePhoto( oCamera ) }
regards, saludos

Antonio Linares
www.fivetechsoft.com
User avatar
Antonio Linares
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Posts: 42148
Joined: Thu Oct 06, 2005 5:47 pm
Location: Spain

Re: Camera Control needed for Tablet

Postby Antonio Linares » Thu Aug 25, 2016 6:25 pm

regards, saludos

Antonio Linares
www.fivetechsoft.com
User avatar
Antonio Linares
Site Admin
 
Posts: 42148
Joined: Thu Oct 06, 2005 5:47 pm
Location: Spain

Re: Camera Control needed for Tablet

Postby Antonio Linares » Thu Aug 25, 2016 6:51 pm

regards, saludos

Antonio Linares
www.fivetechsoft.com
User avatar
Antonio Linares
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Posts: 42148
Joined: Thu Oct 06, 2005 5:47 pm
Location: Spain

Re: Camera Control needed for Tablet

Postby TimStone » Thu Aug 25, 2016 7:19 pm

OK ... that is running and building fine here ( from the .prg included in the .zip file ).

Tim
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http://www.autoshopwriter.com
timstone@masterlinksoftware.com
Using: FWH 23.10 with Harbour 3.2.0 / Microsoft Visual Studio Community 2022-24 32/64 bit
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Re: Camera Control needed for Tablet

Postby Gale FORd » Thu Aug 25, 2016 9:00 pm

On my Microsoft Surface Pro 3 with Windows 10 dshow.exe gets error.
"Could not render preview video stream"
dshow.exe was in the last .zip file you linked to.
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Posts: 663
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Re: Camera Control needed for Tablet

Postby TimStone » Thu Aug 25, 2016 9:21 pm

My Microsoft Surface 3 with the current Win 10 works fine with dShow.exe
Tim Stone
http://www.MasterLinkSoftware.com
http://www.autoshopwriter.com
timstone@masterlinksoftware.com
Using: FWH 23.10 with Harbour 3.2.0 / Microsoft Visual Studio Community 2022-24 32/64 bit
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