/usr/share/doc/libstarlink-ast-doc/node145.html is in libstarlink-ast-doc 8.6.2+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!--Converted with LaTeX2HTML 2008 (1.71)
original version by: Nikos Drakos, CBLU, University of Leeds
* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan
* with significant contributions from:
Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
<HTML>
<HEAD>
<TITLE>Validating Input</TITLE>
<META NAME="description" CONTENT="Validating Input">
<META NAME="keywords" CONTENT="sun211">
<META NAME="resource-type" CONTENT="document">
<META NAME="distribution" CONTENT="global">
<META NAME="Generator" CONTENT="LaTeX2HTML v2008">
<META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css">
<LINK REL="STYLESHEET" HREF="sun211.css">
<LINK REL="next" HREF="node146.html">
<LINK REL="previous" HREF="node144.html">
<LINK REL="up" HREF="node139.html">
<LINK REL="next" HREF="node146.html">
</HEAD>
<BODY >
<DIV CLASS="navigation"><!--Navigation Panel-->
<A NAME="tex2html1950"
HREF="node146.html">
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next"
SRC="/usr/share/latex2html/icons/next.png"></A>
<A NAME="tex2html1948"
HREF="node139.html">
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up"
SRC="/usr/share/latex2html/icons/up.png"></A>
<A NAME="tex2html1942"
HREF="node144.html">
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous"
SRC="/usr/share/latex2html/icons/prev.png"></A>
<BR>
<B> Next:</B> <A NAME="tex2html1951"
HREF="node146.html">Storing an ID String</A>
<B> Up:</B> <A NAME="tex2html1949"
HREF="node139.html">Saving and Restoring Objects</A>
<B> Previous:</B> <A NAME="tex2html1943"
HREF="node144.html">Saving and Restoring Multiple</A>
<BR>
<BR></DIV>
<!--End of Navigation Panel-->
<H2><A NAME="SECTION000156000000000000000"></A><A NAME="ss:validatinginput"></A>
<BR>
Validating Input
</H2>
<P>
The pointer returned by astReadastRead (§<A HREF="node143.html#ss:readingfromachannel">15.4</A>) could
identify any class of ObjectObject--this is determined entirely by the
external data being read. If it is necessary to test for a particular
class (say a FrameFrame), this may be done as follows using the appropriate
member of the astIsA<SPAN CLASS="MATH"><IMG
WIDTH="19" HEIGHT="33" ALIGN="MIDDLE" BORDER="0"
SRC="img1.png"
ALT="$<$"></SPAN>Class<SPAN CLASS="MATH"><IMG
WIDTH="19" HEIGHT="33" ALIGN="MIDDLE" BORDER="0"
SRC="img2.png"
ALT="$>$"></SPAN>astIsA<SPAN CLASS="MATH"><IMG
WIDTH="19" HEIGHT="33" ALIGN="MIDDLE" BORDER="0"
SRC="img1.png"
ALT="$<$"></SPAN>Class<SPAN CLASS="MATH"><IMG
WIDTH="19" HEIGHT="33" ALIGN="MIDDLE" BORDER="0"
SRC="img2.png"
ALT="$>$"></SPAN> family of functions:
<P>
<SMALL CLASS="SMALL">
<BR>
<IMG
WIDTH="223" HEIGHT="91" ALIGN="BOTTOM" BORDER="0"
SRC="img234.png"
ALT="\begin{terminalv}
int ok;
\par
...
\par
ok = astIsAFrame( object );
\end{terminalv}">
<BR>
</SMALL>
<P>
Note, however, that this will accept any Frame, so would be equally
happy with a basic Frame or a SkyFrameSkyFrame. An alternative validation
strategy would be to obtain the value of the Object's ClassClass attribute
and then test this character string, as follows:
<P>
<SMALL CLASS="SMALL">
<BR>
<IMG
WIDTH="432" HEIGHT="91" ALIGN="BOTTOM" BORDER="0"
SRC="img235.png"
ALT="\begin{terminalv}
...">
<BR>
</SMALL>
<P>
This would only accept a basic Frame and would reject a SkyFrame.
<P>
<BR><HR>
</BODY>
</HTML>
|