What wrong in this code? :(

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2 total messages Started by Chawalit K. Mon, 18 Nov 2002 17:22

#756

Author: Chawalit K.
Date: Mon, 18 Nov 2002 17:22

31 lines
1939 bytes

DirectShow Case:
I try to grabber image frame with SampleGrabber and I have array of byte.  I
want save it to file.
But I can see only black color in my image file.
Please show me. What wrong in this code? :-(

      long cbBuffer = 320*240*3;
      HRESULT hr = NULL;
      byte *pBuffer = (byte*)malloc(cbBuffer);
      hr = vcap.pGrabber->GetCurrentBuffer(&cbBuffer, (long*)pBuffer);
      if(FAILED(hr)) {
        return;
      }

      AM_MEDIA_TYPE mt;
      BITMAPINFO  BmpInfo;

      hr = vcap.pGrabber->GetConnectedMediaType(&mt);
      if FAILED(hr) return;
      VIDEOINFOHEADER *pVideoHeader = (VIDEOINFOHEADER*)mt.pbFormat;
      CopyMemory(&BmpInfo.bmiHeader, &pVideoHeader->bmiHeader,
sizeof(BITMAPINFOHEADER));

      Graphics::TBitmap *bmp = new Graphics::TBitmap();
      bmp->HandleType = bmDIB;
      bmp->Handle = CreateDIBSection(0, &BmpInfo, DIB_RGB_COLORS,
(void**)&pBuffer, NULL, 0);
      bmp->SaveToFile("c:\\test" + (AnsiString)aa + ".bmp");

Chawalit K.
Thailand

Re: What wrong in this code? :(

#757

Author: Chawalit K.
Date: Mon, 18 Nov 2002 17:43

70 lines
3187 bytes

Oop! :-p
I know that what wrong is me. ha ha
this right

      long cbBuffer = 320*240*3;
      HRESULT hr = NULL;
      byte *pBuffer = (byte*)malloc(cbBuffer);

      AM_MEDIA_TYPE mt;
      BITMAPINFO  BmpInfo;
      HBITMAP hBitmap = NULL;

      hr = vcap.pGrabber->GetConnectedMediaType(&mt);
      if FAILED(hr) return;
      VIDEOINFOHEADER *pVideoHeader = (VIDEOINFOHEADER*)mt.pbFormat;
      CopyMemory(&BmpInfo.bmiHeader, &pVideoHeader->bmiHeader,
sizeof(BITMAPINFOHEADER));
      hBitmap = CreateDIBSection(0, &BmpInfo, DIB_RGB_COLORS,
(void**)&pBuffer, NULL, 0);
      hr = vcap.pGrabber->GetCurrentBuffer(&cbBuffer, (long*)pBuffer);
      if(FAILED(hr)) {
        return;
      }
      Graphics::TBitmap *bmp = new Graphics::TBitmap();
      bmp->Handle = hBitmap;
      bmp->SaveToFile("c:\\test" + (AnsiString)aa + ".bmp");
      Image1->Canvas->Draw(0,0,bmp);
      delete bmp;
      DeleteObject(hBitmap);

Thanks
Chawalit K.
Thailand

"Chawalit K." <q0022@softhome.net> wrote in message
news:3dd921f1@newsgroups.borland.com...
> DirectShow Case:
> I try to grabber image frame with SampleGrabber and I have array of byte.
I
> want save it to file.
> But I can see only black color in my image file.
> Please show me. What wrong in this code? :-(
>
>       long cbBuffer = 320*240*3;
>       HRESULT hr = NULL;
>       byte *pBuffer = (byte*)malloc(cbBuffer);
>       hr = vcap.pGrabber->GetCurrentBuffer(&cbBuffer, (long*)pBuffer);
>       if(FAILED(hr)) {
>         return;
>       }
>
>       AM_MEDIA_TYPE mt;
>       BITMAPINFO  BmpInfo;
>
>       hr = vcap.pGrabber->GetConnectedMediaType(&mt);
>       if FAILED(hr) return;
>       VIDEOINFOHEADER *pVideoHeader = (VIDEOINFOHEADER*)mt.pbFormat;
>       CopyMemory(&BmpInfo.bmiHeader, &pVideoHeader->bmiHeader,
> sizeof(BITMAPINFOHEADER));
>
>       Graphics::TBitmap *bmp = new Graphics::TBitmap();
>       bmp->HandleType = bmDIB;
>       bmp->Handle = CreateDIBSection(0, &BmpInfo, DIB_RGB_COLORS,
> (void**)&pBuffer, NULL, 0);
>       bmp->SaveToFile("c:\\test" + (AnsiString)aa + ".bmp");
>
> Chawalit K.
> Thailand
>
>

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