bitmapinfo and bitmapfileheader structures

• • Reply

  14 years ago

  by zapacila

  Zapacila

  , Romania

  Joined 14 years ago
   
  Hi
  
  i run into this code.. :
  
  void CVidTestDlg::OnCapture()
  {
  CString Filter;
  CString Filename;
  CRect Rect;
  
  Filter = "Bitmap Files (*.bmp)|*.bmp|AVI Files (*.avi)|*.avi||";
  
  CFileDialog FileDlg(FALSE, "BMP", NULL,
  OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
  Filter,
  this);
  
  if (FileDlg.DoModal() == IDOK)
  {
  RedrawWindow();
  
  Filename = FileDlg.GetPathName();
  
  Capture(m_VFWImageProc, Filename);
  
  m_VideoDisplay.GetWindowRect(Rect);
  ScreenToClient(Rect);
  
  m_VFWImageProc.EnablePreviewVideo(*this, Rect.TopLeft().x,Rect.TopLeft().y);
  }
  }
  
  
  
  BOOL Capture(CVFWImageProcessor &ImageProc, LPCTSTR Filename)
  
  {
  ULONG Length = 0;
  CFile File;
  BOOL Ret = FALSE;
  CHAR Ext[_MAX_EXT];
  
  _splitpath(Filename,NULL,NULL,NULL,Ext);
  
  if (stricmp(Ext,".avi") == 0)
  {
  Ret = ImageProc.CaptureAVI(Filename,4.0,10,10);
  }
  else if (stricmp(Ext,".bmp") == 0)
  {
  BITMAPINFO *Bitmap = NULL;
  BITMAPFILEHEADER bfh;
  
  ImageProc.CaptureDIB(&Bitmap,0,&Length);
  
  if (Bitmap)
  {
  File.Open(Filename,CFile::modeCreate |
  CFile::modeWrite |
  CFile::shareDenyNone |
  CFile::typeBinary);
  
  bfh.bfType = 0x4d42; // 0x42 = "B" 0x4d = "M"
  bfh.bfSize = (DWORD) Length + sizeof(BITMAPFILEHEADER);
  bfh.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) +
  sizeof(BITMAPINFOHEADER) +
  Bitmap->bmiHeader.biClrUsed * sizeof (RGBQUAD);
  bfh.bfReserved1 = 0;
  bfh.bfReserved2 = 0;
  
  
  
  File.Write(&bfh,sizeof(bfh));
  File.Write(Bitmap,Length);
  
  File.Close();
  
  Ret = TRUE;
  
  delete Bitmap;
  }
  
  this is the code that is resposible for capturing a image from usb webcam and saving to hard driver
  
  Function : CaptureDIB
  Arguments : Bitmap (output) - Pointer to bitmap to receive image.
  If *Bitmap = NULL, then allocation will
  be performed automatically.
  BitmapLength (input) - Size of Bitmap if *Bitmap is not NULL.
  RetBitmapLength (output) - Actual size of image.
  Return : TRUE Success, FALSE Failed.
  Description: Captures a DIB image from video capture device.
  
  As you see he uses some structs BITMAPINFO BITMAPFILEHEADER wihich togheter is the bitmap file. and writes it down to file.
  
  now my problem...
  
  i must make a dll wich exports symbols and a function within it , lets call it Capture that will return a bitmap (whole bitmap including header)
  
  but i dont know how to copy the both struct within a buffer or something and return it.
  
  can someone help. does someone get me..
  
  sorry for bad explanation . i`m not champion at c++
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
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• • Reply

  14 years ago

  by Mohammad Rastkar

  Mohammad Rastkar

  Shiraz, Iran

  Joined 14 years ago

  Creating a new struct (BITMAPFILEHEADER_BITMAPINFO), that contains all the members of BITMAPINFO & BITMAPFILEHEADER ?

   

  struct BITMAPFILEHEADER_BITMAPINFO
  {
      WORD    bfType;
      DWORD   bfSize;
      WORD    bfReserved1;
      WORD    bfReserved2;
      DWORD   bfOffBits;
  
  
  
  
  
  

      BITMAPINFOHEADER    bmiHeader;
      RGBQUAD             bmiColors[1];
  

  };

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