.\" $Id: TIFFFieldWriteCount.3tiff,v 1.2 2016-09-25 20:05:49 bfriesen Exp $
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.\" Copyright (c) 2012, Tom Lane <tgl@sss.pgh.pa.us>
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.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/