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2005.10.31 19:52 "TIFFSetField vs TIFFSetField+Private tags", by Mathieu Malaterre

2005.10.31 20:11 "Re: TIFFSetField vs TIFFSetField+Private tags", by Mathieu Malaterre

2005.10.31 19:52 "TIFFSetField vs TIFFSetField+Private tags", by Mathieu Malaterre

Hello there,

I am not sure I understand the private tags thing. What is wrong with 
the following code:

#define           TIFFTAG_PRIVATE         34595

static void TagExtender(TIFF *tiff)
{
   static const TIFFFieldInfo xtiffFieldInfo[] = {
       { TIFFTAG_PRIVATE, TIFF_VARIABLE, TIFF_VARIABLE, TIFF_BYTE,
       FIELD_CUSTOM, 0, 1, "Private Tag" }
   };

   TIFFMergeFieldInfo( tiff, xtiffFieldInfo,
     sizeof(xtiffFieldInfo) / sizeof(xtiffFieldInfo[0]) );
}

int main()
{
   TIFF *intif;
   int iCount;
   intif = TIFFOpen("bla.tif","w");
   TIFFSetTagExtender(TagExtender);

   TIFFSetDirectory(intif, 0);
   char *currentTag = 0;
   TIFFSetField(intif, TIFFTAG_SOFTWARE, "Foo Bar");
   TIFFGetField(intif, TIFFTAG_SOFTWARE, &currentTag);
   fprintf( stderr, "Soft tag : %s\n", currentTag );  // ok so far...

   iCount = sizeof(lng)/sizeof(lng[0]);
   TIFFSetField(intif, TIFFTAG_PRIVATE, iCount, lng); //-> returns 0

   TIFFWriteDirectory( intif );

   TIFFClose(intif);
   return 0;
}


Thanks
Mathieu