Re: [UMN_MAPSERVER-USERS] WMS Java Mapscript : msIO_getStdoutBufferBytes bug

Howard Butler Wed, 09 Aug 2006 06:51:04 -0700

This is most likely a bug in the gdBuffer typemapfor Java MapScript. Please file a bug in buzillafor the Java MapScript component with yourexample and information.


Thanks


Howard

At 10:32 AM -0300 8/9/06, José Vilson de Mello de Farias wrote:

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Greetings,

 I've compiled MapServer from the CVS HEAD 4.9-dev (2006-07-28) and I'm
suposing the msIO_getStdoutBufferBytes is not working properly when used
in Java Mapscript. I've written a very simple example to explain how it
happens. Please take a look at it :
public void doPost(HttpServletRequest req,HttpServletResponse resp) throwsServletException, IOExcept
 {
 PrintWriter p = resp.getWriter();
 mapObj map = new mapObj("/home/maps/rs.wms.map");

 OWSRequest reqOWS = new OWSRequest();
 reqOWS.setParameter("SERVICE", "WMS");
 reqOWS.setParameter("VERSION", "1.1.0");
 reqOWS.setParameter("REQUEST", "GetCapabilities");


 mapscript.msIO_installStdoutToBuffer();
 map.OWSDispatch(reqOWS);


 String contentType = mapscript.msIO_stripStdoutBufferContentType();
 byte[] content = mapscript.msIO_getStdoutBufferBytes();
 p.print(new String(content));

 }


The "byte[] content" stores the result of
msIO_stripStdoutBufferContentType and it has some garbage data at the
end. After the > 0x3E we have an NL 0x0A and finally a EOF 0x00, BUT the
content doesn't stop at this point, there are more data after the 0x00
and the Java Mapscript can "see" it. That's a big problem, because when
this "content" is returned, the resulting XML is corrupted. Please check
this example bellow.
000018a0 20 20 20 20 20 20 20 20 20 3c 2f4c 65 67 65 6e | </Legen|000018b0 64 55 52 4c 3e 0a 20 20 20 20 2020 20 20 3c 2f |dURL>. </|000018c0 53 74 79 6c 65 3e 0a 20 20 20 203c 2f 4c 61 79 |Style>. </Lay|000018d0 65 72 3e 0a 20 20 3c 2f 4c 61 7965 72 3e 0a 3c |er>. </Layer>.<|000018e0 2f 43 61 70 61 62 69 6c 69 74 793e 0a 3c 2f 57 |/Capability>.</W|000018f0 4d 54 5f 4d 53 5f 43 61 70 61 6269 6c 69 74 69 |MT_MS_Capabiliti|00001900 65 73 3e 0a 00 14 00 00 00 14 0000 00 14 00 00 |es>.............|00001910 00 14 00 00 00 14 00 00 00 14 0000 00 14 00 00 |................|00001920 00 14 00 00 00 14 00 00 00 14 0000 00 14 00 |...............|
Is it a known bug? I'm afraid this kind of garbage can produce
undesirable effects in WMS support. For this simples example I can
"manually" remove it but I'm not sure how to deal with it in other
cases. I'll be greatful if you could give me some light.


Best regards,

--
*JosÈ Vilson de Mello de Farias*
/Analista de Sistemas
//SSE - SeguranÁa Pblica/

*DÕGITRO TECNOLOGIA*
*E-mail:* [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>
*Messenger: [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>
***Site:* www.digitro.com.br <http://www.digitro.com.br%20>
<http://www.digitro.com.br%20>

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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 <title></title>
</head>
<body bgcolor="#ffffff" text="#000000">
Greetings, 
 
&nbsp; I've compiled MapServer from the CVS HEAD 4.9-dev (2006-07-28) and
I'm suposing the msIO_getStdoutBufferBytes is not working properly when
used in Java Mapscript. I've written a very simple example to explain
how it happens. Please take a look at it : 
 

<blockquote>
<pre>  public voiddoPost(HttpServletRequest req,HttpServletResponse resp) throwsServletException, IOExcept</pre>
 <pre>&nbsp; {
&nbsp;&nbsp;&nbsp; PrintWriter p = resp.getWriter();
    mapObj map = newmapObj("/home/maps/rs.wms.map");</pre><pre>    OWSRequest reqOWS =new OWSRequest();
&nbsp;&nbsp;&nbsp; reqOWS.setParameter("SERVICE", "WMS");
&nbsp;&nbsp;&nbsp; reqOWS.setParameter("VERSION", "1.1.0");
&nbsp;&nbsp;&nbsp; reqOWS.setParameter("REQUEST", "GetCapabilities");&nbsp;
 </pre>
<pre>   mapscript.msIO_installStdoutToBuffer();
&nbsp;&nbsp;&nbsp; map.OWSDispatch(reqOWS);&nbsp;
 </pre>
<pre>    String contentType= mapscript.msIO_stripStdoutBufferContentType();
&nbsp;&nbsp;&nbsp; byte[] content = mapscript.msIO_getStdoutBufferBytes();
&nbsp;&nbsp;&nbsp; p.print(new String(content));</pre>
 <pre>&nbsp; } </pre>
</blockquote>
 
The "byte[] content" stores the result of
msIO_stripStdoutBufferContentType and it has some garbage data at the
end. After the &gt; 0x3E we have an NL 0x0A and finally a EOF 0x00, BUT
the content doesn't stop at this point, there are more data after the
0x00 and the Java Mapscript can "see" it. That's a big problem, because
when this "content" is returned, the resulting XML is corrupted. Please
check this example bellow. 
 

<blockquote>
<pre>000018a0  20 20 20 20 20 20 2020  20 3c 2f 4c 65 67 65 6e |        </Legen|000018b0  64 55 52 4c 3e 0a 20 20  2020 20 20 20 20 3c 2f |dURL>.       </|000018c0  53 74 79 6c 65 3e 0a 20  2020 20 3c 2f 4c 61 79 |Style>.    </Lay|000018d0  65 72 3e 0a 20 20 3c 2f  4c61 79 65 72 3e 0a 3c  |er>. </Layer>.<|000018e0  2f 43 61 70 61 62 69 6c  6974 79 3e 0a 3c 2f 57 |/Capability>.</W|000018f0  4d 54 5f 4d 53 5f 43 61  7061 62 69 6c 69 74 69  |MT_MS_Capabiliti|00001900  65 73 3e 0a 00 14 00 00  0014 00 00 00 14 00 00  |es>.............|00001910  00 14 00 00 00 14 00 00  0014 00 00 00 14 00 00  |................|00001920  00 14 00 00 00 14 00 00  0014 00 00 00 14 00    |...............|</pre>
</blockquote>
Is it a known bug? I'm afraid this kind of
garbage can produce undesirable effects in WMS support. For this
simples example I can "manually" remove it but I'm not sure how to deal
with it in other cases. I'll be greatful if you could give me some
light. 
 
 
Best regards, 
<div class="moz-signature"> 
-- 
<meta content="text/html; charset=ISO-8859-1" http-equiv="content-type">
<title></title>
José Vilsonde Mello de Farias 
<big>Analista de Sistemas 
</big>SSE - Seguran&ccedil;a P&uacute;blica 
 
D&Iacute;GITRO TECNOLOGIA 
E-mail: <a
href="mailto:[EMAIL PROTECTED]"><fontcolor="#606060">[EMAIL PROTECTED]</a> 
Messenger: <a
href="mailto:[EMAIL PROTECTED]"><fontcolor="#606060">[EMAIL PROTECTED]</a> Site:
<a href="http://www.digitro.com.br%20";><fontcolor="#000000">www.digitro.com.br</a><a
 href="http://www.digitro.com.br%20";> </a>
</div>
</body>
</html>

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Re: [UMN_MAPSERVER-USERS] WMS Java Mapscript : msIO_getStdoutBufferBytes bug

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