.\" $Id: TIFFWarning.3tiff,v 1.4 2016-09-25 20:05:50 bfriesen Exp $

.\"

.\" Copyright (c) 1988-1997 Sam Leffler

.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.

.\"

.\" 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, 

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.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  

.\" 

.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR

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.\" OF THIS SOFTWARE.

.\"

.if n .po 0

.TH TIFFWarning 3TIFF "October 15, 1995" "libtiff"

.SH NAME

TIFFWarning, TIFFSetWarningHandler \- library warning interface

.SH SYNOPSIS

.B "#include <tiffio.h>"

.sp

.BI "void TIFFWarning(const char *" module ", const char *" fmt ", " ... ")"

.sp

.B "#include <stdarg.h>"

.sp

.BI "typedef void (*TIFFWarningHandler)(const char *" module ", const char *" fmt ", va_list " ap ");"

.sp

.BI "TIFFWarningHandler TIFFSetWarningHandler(TIFFWarningHandler " handler ");"

.SH DESCRIPTION

.I TIFFWarning

invokes the library-wide warning handler function to (normally) write a

warning message to the

.BR stderr .

The

.I fmt

parameter is a

.IR printf (3S)

format string, and any number arguments can be supplied. The

.I module

parameter is interpreted as a string that, if non-zero, should be printed

before the message; it typically is used to identify the software module in

which a warning is detected.

.PP

Applications that desire to capture control in the event of a warning should

use

.IR TIFFSetWarningHandler

to override the default warning handler.

A

.SM NULL

(0) warning handler function may be installed to suppress error messages.

.SH "RETURN VALUES"

.IR TIFFSetWarningHandler

returns a reference to the previous error handling function.

.SH "SEE ALSO"

.BR TIFFError (3TIFF),

.BR libtiff (3TIFF),

.BR printf (3)

.PP

Libtiff library home page:

.BR http://www.simplesystems.org/libtiff/