tiffsetdirectory.3t

tiff文件开发库

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.\" Copyright (c) 1988-1997 Sam Leffler
.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
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.if n .po 0
.TH TIFFSetDirectory 3T "October 15, 1995"
.SH NAME
TIFFSetDirectory, TIFFSetSubDirectory \- set the current directory for an open
.SM TIFF
file
.SH SYNOPSIS
.B "#include <tiffio.h>"
.br
.B "int TIFFSetDirectory(TIFF* tif, tdir_t dirnum)"
.br
.B "int TIFFSetSubDirectory(TIFF* tif, uint32 diroff)"
.SH DESCRIPTION
.I TIFFSetDirectory
changes the current directory and reads its contents with
.IR TIFFReadDirectory .
The parameter
.I dirnum
specifies the subfile/directory as an integer number, with
the first directory numbered zero.
.PP
.I TIFFSetSubDirectory
acts like 
.IR TIFFSetDirectory ,
except the directory is specified as a
file offset instead of an index; this is required for accessing
subdirectories linked through a
.I SubIFD
tag.
.SH "RETURN VALUES"
On successful return 1 is returned.
Otherwise, 0 is returned if 
.I dirnum
or
.I diroff
specifies a non-existent directory, or if an error was
encountered while reading the directory's contents.
.SH DIAGNOSTICS
All error messages are directed to the
.IR TIFFError (3T)
routine.
.PP
.BR "%s: Error fetching directory count" .
An error was encountered while reading the ``directory count'' field.
.PP
.BR "%s: Error fetching directory link" .
An error was encountered while reading the ``link value'' that
points to the next directory in a file.
.SH "SEE ALSO"
.IR libtiff (3T),
.IR TIFFCurrentDirectory (3T),
.IR TIFFOpen (3T),
.IR TIFFReadDirectory (3T),
.IR TIFFWriteDirectory (3T)