.\" Copyright (C) 2001 Information-technology Promotion Agency (IPA)
.\" Copyright (C) 2001-2003
.\"   National Institute of Advanced Industrial Science and Technology (AIST)
.\" This file si aprt of the m17n library documentation.
.\" Permission is granted to copy, distribute and/or modify this document
.\" under the terms of the GNU Free Documentation License, Version 1.2 or
.\" any later version published by the Free Software Foundation; with no
.\" Invariant Section, Front-Cover Texts "The m17n library documentation",
.\" and no Back-Cover Texts.  A copy of the license is included in the
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.TH "mtext_get_prop" 3m17n "14 Jul 2007" "" "Version 1.4.0" "" "The m17n Library" \" -*- nroff -*-
.ad l
.nh
.SH NAME
mtext_get_prop - Get the value of the topmost text property. 


.SH SYNOPSIS
void*
\fBmtext_get_prop\fP (\fBMText\fP *
\fImt\fP, int
\fIpos\fP, \fBMSymbol\fP
\fIkey\fP)


.SH DESCRIPTION
The
.ft B
mtext_get_prop()
.ft R
function searches the character at
.ft B
pos
.ft R
in M-text
.ft B
mt
.ft R
for the text property whose key is
.ft B
key\fP.
.ft R
.PP
.SH RETURN VALUE
.PP.RS 4
If a text property is found,
.ft B
mtext_get_prop()
.ft R
returns the value of the property. If the property has multiple values, it returns the topmost one. If no such property is found, it returns
.ft C
NULL
.ft R
without changing the external variable
.ft B
merror_code\fP.
.ft R
.RE
.PP
If an error is detected,
.ft B
mtext_get_prop()
.ft R
returns
.ft C
NULL
.ft R
and assigns an error code to the external variable
.ft B
merror_code\fP.
.ft R
.PP
.SS Note

If
.ft C
NULL
.ft R
is returned without an error, there are two possibilities:
.RE
.PP
.PD 0
.IP "\(bu" 2
the character at
.ft B
pos
.ft R
does not have a property whose key is
.ft B
key\fP,
.ft R
or
.PP
.PD 0
.IP "\(bu" 2
the character does have such a property and its value is
.ft C
NULL\fP.
.ft R
.PP
If you need to distinguish these two cases, use the
.ft B
mtext_get_prop_values()
.ft R
function instead.
.PP
.SH ERRORS
.PP.RS 4
\fCMERROR_RANGE\fP,
.ft R
.ft C
MERROR_SYMBOL
.ft R
.RE
.PP
.SH "SEE ALSO"
.PP.RS 4
\fBmtext_get_prop_values()\fP,
.ft R
.ft B
mtext_put_prop()\fP,
.ft R
.ft B
mtext_put_prop_values()\fP,
.ft R
.ft B
mtext_push_prop()\fP,
.ft R
.ft B
mtext_pop_prop()\fP,
.ft R
.ft B
mtext_prop_range()
.ft R
.RE
.PP