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<th colspan="3" align="center">LPRng Reference Manual: 24
Sep 2004 (For LPRng-3.8.28)</th>
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<h1 class="SECT1"><a name="AEN10996">21.3. Message
Format</a></h1>
<p>Each message is encoded as a URI escaped string. That is,
non-alphanumeric characters are encoded as the 3 character
sequence <var class="LITERAL">%xx</var>, where <var class=
"LITERAL">xx</var> is the hexadecimal value of the character.
The message has the format <var class=
"LITERAL">key=value</var>, where <var class=
"LITERAL">key</var> indicates the message type. For
example:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN11003"></a>
<pre class="SCREEN">
dump=host=h4.private%0aprinter=t1%0aprocess=1613%0a
update_time=1999-03-23-20:32:17.148%0a\
value=queue=holdall 0%25250aprinting_aborted=0x0%25250a\
printing_disabled=0x0%25250aspooling_disabled=\
0x0%25250a%250a%0a
</pre>
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<br>
<br>
<p>The following keys are used:</p>
<ol type="1">
<li>
<p>dump A status dump of the current contents of a print
queue.</p>
</li>
</ol>
<br>
<br>
<p>Each message has a set of headers and a value. For
example, the decoded dump message from the previous section
would be:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN11010"></a>
<pre class="SCREEN">
host=h4.private
printer=t1
process=1613
update_time=1999-03-23-20:32:17.148
value=queue=holdall 0%250aprinting_aborted=0x0%250a\
printing_disabled=0x0%250aspooling_disabled=0x0%250a%0a
</pre>
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<br>
<br>
<p>Each line consists of a key and a value. The <var class=
"LITERAL">host</var> key indicates the host name, <var class=
"LITERAL">printer</var> is the print queue, <var class=
"LITERAL">process</var> is the process which generated the
report or action, <var class="LITERAL">update_time</var> is
the time at which the report was generated, and <var class=
"LITERAL">value</var> is the value of the report.</p>
<p>The decoded <var class="LITERAL">value</var> of the above
report is:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN11020"></a>
<pre class="SCREEN">
queue='holdall 0%0aprinting_aborted=0x0%0aprinting_disabled=0x0%0a\
spooling_disabled=0x0%0a
</pre>
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<br>
<br>
<p>The <var class="LITERAL">queue</var> key provides the
current value of the queue control file.</p>
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