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2004.08.29 19:08 "Re: (no subject)", by Andrey Kiselev
On Thu, Aug 26, 2004 at 07:38:46PM +0200, Graf Martin wrote:
> Does one know, how I can add some special tags to a existing *.tiff
> file ?
Hello,
You can found a short sample code attached. This program shows how to
set and read custom tags of different types.
Andrey
--
Andrey V. Kiselev
Home phone: +7 812 5274898 ICQ# 26871517
#include <tiffio.h>
#include <stdio.h>
#define TIFFTAG_ASCIITAG 666
#define TIFFTAG_LONGTAG 667
#define TIFFTAG_SHORTTAG 668
#define TIFFTAG_RATIONALTAG 669
#define TIFFTAG_FLOATTAG 670
#define TIFFTAG_DOUBLETAG 671
#define TIFFTAG_BYTE 672
static void TagExtender(TIFF *tiff)
{
static const TIFFFieldInfo xtiffFieldInfo[] = {
{ TIFFTAG_ASCIITAG, -1,-1, TIFF_ASCII, FIELD_CUSTOM,
1, 0, "MyTag" },
{ TIFFTAG_SHORTTAG, 1, 1, TIFF_SHORT, FIELD_CUSTOM, 0, 1,
"ShortTag" },
{ TIFFTAG_LONGTAG, 1, 1, TIFF_LONG, FIELD_CUSTOM, 0, 1,
"LongTag" },
{ TIFFTAG_RATIONALTAG, 1, 1, TIFF_RATIONAL, FIELD_CUSTOM, 0, 1,
"RationalTag" },
{ TIFFTAG_FLOATTAG, 1, 1, TIFF_FLOAT, FIELD_CUSTOM, 0, 1,
"FloatTag" },
{ TIFFTAG_DOUBLETAG, 1, 1, TIFF_DOUBLE, FIELD_CUSTOM, 0, 1,
"DoubleTag" },
{ TIFFTAG_BYTE, 1, 1, TIFF_BYTE, FIELD_CUSTOM, 0, 1,
"DoubleTag" },
};
TIFFMergeFieldInfo( tiff, xtiffFieldInfo,
sizeof(xtiffFieldInfo) / sizeof(xtiffFieldInfo[0]) );
}
int main()
{
TIFF *tiff;
char *pszString;
long iLong, *paiLong;
short iShort, *paiShort;
float fFloat, *pafFloat;
double dfDouble, *padfDouble;
char iByte, *paiByte;
unsigned short iCount;
/* Register the custom tag hadler */
TIFFSetTagExtender(TagExtender);
/* Open existing TIFF file in update mode */
tiff = TIFFOpen("test.tif", "r+");
TIFFSetField(tiff, TIFFTAG_ASCIITAG, "Tag contents");
iShort = 263;
TIFFSetField(tiff, TIFFTAG_SHORTTAG, 1, &iShort);
iLong = 117;
TIFFSetField(tiff, TIFFTAG_LONGTAG, 1, &iLong);
fFloat = 0.333333;
TIFFSetField(tiff, TIFFTAG_RATIONALTAG, 1, &fFloat);
fFloat = 0.666666;
TIFFSetField(tiff, TIFFTAG_FLOATTAG, 1, &fFloat);
dfDouble = 0.1234567;
TIFFSetField(tiff, TIFFTAG_DOUBLETAG, 1, &dfDouble);
iByte = 89;
TIFFSetField(tiff, TIFFTAG_BYTE, 1, &iByte);
TIFFRewriteDirectory(tiff);
TIFFClose(tiff);
/* Open that TIFF again and read new tags. */
tiff = TIFFOpen("test.tif", "r");
TIFFGetField(tiff, TIFFTAG_ASCIITAG, &pszString);
printf("ASCII tag: %s\n", pszString);
TIFFGetField(tiff, TIFFTAG_SHORTTAG, &iCount, &paiShort);
if (iCount == 1)
printf("Short tag: %d\n", paiShort[0]);
TIFFGetField(tiff, TIFFTAG_LONGTAG, &iCount, &paiLong);
if (iCount == 1)
printf("Long tag: %ld\n", paiLong[0]);
TIFFGetField(tiff, TIFFTAG_RATIONALTAG, &iCount, &pafFloat);
if (iCount == 1)
printf("Rational tag: %f\n", pafFloat[0]);
TIFFGetField(tiff, TIFFTAG_FLOATTAG, &iCount, &pafFloat);
if (iCount == 1)
printf("Float tag: %f\n", pafFloat[0]);
TIFFGetField(tiff, TIFFTAG_DOUBLETAG, &iCount, &padfDouble);
if (iCount == 1)
printf("Double tag: %lf\n", padfDouble[0]);
TIFFGetField(tiff, TIFFTAG_BYTE, &iCount, &paiByte);
if (iCount == 1)
printf("Byte tag: %d\n", paiByte[0]);
TIFFClose(tiff);
return 0;
}