Re: VC6 image conversion using GDI+

"Ed" : <news:6sedndWoF8nreMvQnZ2dnUVZ_gydnZ2d@giganews.com> mas o menos
el s?b, 12 feb 2011 19:54:45 GMT


You can try FreeImage http://freeimage.sourceforge.net/download.html
download this archive FreeImage3150Win32.zip
You got some examples inside this folder FreeImage\Examples\Generic\
but BatchLoad.cpp is the most useful for you, because it shows how to
load and save images.

A TiffToBmp function could be something like this:
<code>
#include "..\FreeImage\FreeImage.h"
#include "..\FreeImage\FreeImagePlus.h"

#ifdef _DEBUG
# pragma comment ( lib, "..\\FreeImage\\FreeImaged.lib" )
# pragma comment ( lib, "..\\FreeImage\\FreeImagePlusd.lib" )
#else
# pragma comment ( lib, "..\\FreeImage\\FreeImage.lib" )
# pragma comment ( lib, "..\\FreeImage\\FreeImagePlus.lib" )
#endif

void TiffToBmp(const CString &filename)
{
FREE_IMAGE_FORMAT fif = FIF_UNKNOWN;
// try to guess the file format from the file extension

#ifdef _UNICODE
fif = FreeImage_GetFIFFromFilenameU(filename);
#else
fif = FreeImage_GetFIFFromFilename(filename));
#endif

if(fif == FIF_TARGA )

{
  #ifdef _UNICODE
  FIBITMAP *bitmap = FreeImage_LoadU( fif, filename, 0 );
  #else
  FIBITMAP *bitmap = FreeImage_Load( fif, filename, 0 );
  #endif
  if (bitmap)
  {
   // bitmap successfully loaded!
   int flag = 0;
   CString filenameOut;
   int i = filename.ReverseFind('.');
   filenameOut = filename.Left ( i );
   filenameOut += _T(".bmp");

   // try to guess the file format from the file extension
   #ifdef _UNICODE
   fif = FreeImage_GetFIFFromFilenameU(filenameOut);
   #else
   fif = FreeImage_GetFIFFromFilename(filenameOut));
   #endif
   if(fif != FIF_UNKNOWN )
   {
    // check that the plugin has sufficient writing and export
capabilities ...
    UINT bpp = FreeImage_GetBPP(bitmap);
    if(FreeImage_FIFSupportsWriting(fif) &&
FreeImage_FIFSupportsExportBPP(fif, bpp))
    {
     // ok, we can save the file
     #ifdef _UNICODE
     bSuccess = FreeImage_SaveU(fif, bitmap, filenameOut, flag);
     #else
     bSuccess = FreeImage_Save(fif, bitmap, filenameOut, flag);
     #endif
     // unless an abnormal bug, we are done !
     }
    }
  }
}
}
<code>