TIFFSETDIRECTORY(3tiff) LibTIFF TIFFSETDIRECTORY(3tiff)
NAME
TIFFSetDirectory - set the current directory for an open TIFF file
SYNOPSIS
#include <tiffio.h>
TIFFSetDirectory(3) *tif, tdir_t dirnum)
int TIFFSetSubDirectory(TIFF *tif, uint64_t diroff)
DESCRIPTION
TIFFSetDirectory() changes the current directory and reads its contents
with TIFFReadDirectory(). The parameter dirnum specifies the
subfile/directory as an integer number, with the first directory
numbered zero. TIFFSetDirectory() only works with main-IFD chains
because allways starts with the first main-IFD and thus is able to
reset the SubIFD reading chain to the main-IFD chain.
TIFFSetSubDirectory() acts like TIFFSetDirectory(), except the
directory is specified as a file offset instead of an index; this is
required for accessing subdirectories linked through a SubIFD tag.
(see MultiPage SubIFD)
Directory query functions TIFFCurrentDirectory(),
TIFFCurrentDirOffset(), TIFFLastDirectory() and
TIFFNumberOfDirectories() retrieve information about directories in an
open TIFF file. Be aware that until a directory is not written to file
AND read back, the query functions won't retrieve the correct
information!
RETURN VALUES
On successful return 1 is returned. Otherwise, 0 is returned if dirnum
or diroff specifies a non-existent directory, or if an error was
encountered while reading the directory's contents.
DIAGNOSTICS
All error messages are directed to the TIFFErrorExtR() routine.
"%s: Error fetching directory count":
An error was encountered while reading the "directory count" field.
"%s: Error fetching directory link":
An error was encountered while reading the "link value" that points
to the next directory in a file.
SEE ALSO
TIFFquery(3), TIFFOpen(3), TIFFCreateDirectory(3),
TIFFCustomDirectory(3), TIFFWriteDirectory(3),
TIFFReadDirectory(3), libtiff(3)
AUTHOR
LibTIFF contributors
COPYRIGHT
1988-2022, LibTIFF contributors
4.5 June 10, 2023 TIFFSETDIRECTORY(3tiff)
tiff 4.5.1 - Generated Thu Jun 15 08:05:42 CDT 2023