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.TH "XmTextFieldGetSubstring" "library call"
.SH "NAME"
\fBXmTextFieldGetSubstring\fP \(em A TextField function that retrieves a copy
of a portion of the internal text buffer
.iX "XmTextFieldGetSubstring"
.iX "TextField functions" "XmTextFieldGetSubstring"
.SH "SYNOPSIS"
.PP
.nf
#include <Xm/TextF\&.h>
\fBint \fBXmTextFieldGetSubstring\fP\fR(
\fBWidget \fBwidget\fR\fR,
\fBXmTextPosition \fBstart\fR\fR,
\fBint \fBnum_chars\fR\fR,
\fBint \fBbuffer_size\fR\fR,
\fBchar *\fBbuffer\fR\fR);
.fi
.SH "DESCRIPTION"
.PP
\fBXmTextFieldGetSubstring\fP retrieves a copy of a portion
of the internal text buffer of a TextField widget\&. The function
copies a specified number of characters from a given start position
in the internal text buffer into a buffer provided by the application\&.
A NULL terminator is placed at the end of the copied data\&.
.PP
The size of the required buffer depends on the maximum number
of bytes per character (\fBMB_CUR_MAX\fP) for the current locale\&.
\fBMB_CUR_MAX\fP is a macro defined in \fBstdlib\&.h\fP\&. The buffer
should be large enough to contain the substring to be copied
and a NULL terminator\&. Use the following equation to calculate
the size of buffer the application should provide:
.PP
.nf
\fIbuffer_size\fP = (\fInum_chars\fP* MB_CUR_MAX) + 1
\fB\fR(\fBvoid\fR)
.fi
.IP "\fIwidget\fP" 10
Specifies the TextField widget ID\&.
.IP "\fIstart\fP" 10
Specifies the beginning character position from which the data
will be retrieved\&. This is an integer number of characters from
the beginning of the text buffer\&. The first character position
is 0 (zero)\&.
.IP "\fInum_chars\fP" 10
Specifies the number of characters to be copied into the provided
buffer\&.
.IP "\fIbuffer_size\fP" 10
Specifies the size of the supplied buffer in bytes\&. This size
should account for a NULL terminator\&.
.IP "\fIbuffer\fP" 10
Specifies the character buffer into which the internal
text buffer will be copied\&.
.PP
For a complete definition of TextField and its associated resources,
see \fBXmTextField\fP(3)\&.
.SH "RETURN"
.IP "\fBXmCOPY_SUCCEEDED\fP" 10
The function was successful\&.
.IP "\fBXmCOPY_FAILED\fP" 10
The function failed because it was unable to copy the
specified number of characters into the buffer provided\&.
The buffer size may be insufficient\&. The contents of
\fIbuffer\fP are undefined\&.
.IP "\fBXmCOPY_TRUNCATED\fP" 10
The requested number of characters extended beyond the internal
buffer\&. The function copied characters between \fIstart\fP and
the end of the widget\&'s buffer and terminated the string with
a NULL terminator; fewer than \fInum_chars\fP characters were
copied\&.
.SH "RELATED"
.PP
\fBXmTextField\fP(3) and \fBXmTextFieldGetSubstringWcs\fP(3)\&.
...\" created by instant / docbook-to-man, Sun 22 Dec 1996, 20:34