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.\" $Id: TIFFFieldWriteCount.3tiff,v 1.2 2016-09-25 20:05:49 bfriesen Exp $
.\"
.\" Copyright (c) 2012, Tom Lane <tgl@sss.pgh.pa.us>
.\"
.\" Permission to use, copy, modify, distribute, and sell this software and
.\" its documentation for any purpose is hereby granted without fee, provided
.\" that (i) the above copyright notices and this permission notice appear in
.\" all copies of the software and related documentation, and (ii) the names of
.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
.\" publicity relating to the software without the specific, prior written
.\" permission of Sam Leffler and Silicon Graphics.
.\"
.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
.\"
.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
.\" OF THIS SOFTWARE.
.\"
.if n .po 0
.TH TIFFFieldWriteCount 3TIFF "July 26, 2012" "libtiff"
.SH NAME
TIFFFieldWriteCount \- Get number of values to be written to field
.SH SYNOPSIS
.B "#include <tiffio.h>"
.sp
.BI "int TIFFFieldWriteCount(const TIFFField* " fip ")"
.SH DESCRIPTION
.BR TIFFFieldWriteCount
returns the number of values to be written into the specified
TIFF field; that is, the number of arguments that should be supplied to
.BR TIFFSetField .
For most field types this is a small positive integer, typically 1 or 2,
but there are some special values:
.br
.BR TIFF_VARIABLE
indicates that a variable number of values is possible; then, a
.BR uint16
.I count
argument and a pointer
.I data
argument must be supplied to
.BR TIFFSetField .
.br
.BR TIFF_VARIABLE2
is the same as
.BR TIFF_VARIABLE
except that the
.I count
argument must have type
.BR uint32 .
(On most modern machines, this makes no practical difference, and the
.I count
argument can simply be an
.BR int
in either case.)
.br
.BR TIFF_SPP
indicates that the number of arguments must be equal to the image's
number of samples per pixel.
.P
.I fip
is a field information pointer previously returned by
.BR TIFFFindField ,
.BR TIFFFieldWithTag ,
or
.BR TIFFFieldWithName .
.P
For most field types,
.BR TIFFFieldWriteCount
returns the same value as
.BR TIFFFieldReadCount ,
but there are some exceptions.
.br
.SH "RETURN VALUES"
.br
.BR TIFFFieldWriteCount
returns an integer.
.br
.SH "SEE ALSO"
.BR libtiff (3TIFF),
.PP
Libtiff library home page:
.BR http://www.simplesystems.org/libtiff/
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