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October 2005
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2005.10.20 01:47 "Read EXIF Tag", by Chris Losinger
i just dropped-in LibTiff v3.7.4, and i'm having trouble reading tag
0x8769 (TIFFTAG_EXIFIFD).
long *offset = 0;
UINT16 count = 0;
BOOL bFound = TIFFGetField(tif, 0x8769, &count, &offset);
... yields bFound = 0
in 3.7.0, i had a _TIFFMergeFieldInfo extender setup that would grab
that tag and a couple of others. now, i see that LibTiff has support
for reading that tag natively, so i've disabled my extender, and am
trying to read that tag the same way i'd read any other tag. but, it
doesn't seem to grab it from my test TIFFs. (v3.7.0 with the extender does)
is there anything i need to do before trying to read that tag ?
note that i'm not trying to parse the EXIF IFD with LibTiff (yet),
i'm just trying to get the raw tag data.
-c
----
Chris Losinger
losinger@earthlink.net
smallest@smalleranimals.com http://www.smalleranimals.com