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<p class=MsoNormal><span lang=EN-GB style='font-size:9.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'>Hi Suman,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:9.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'>Check your web.config file- You probably have an entry similar
to:<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'><</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>appSettings</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;font-family:"Courier New";
color:#A31515'>add</span><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> </span><span style='font-size:10.0pt;font-family:"Courier New";
color:red'>key</span><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>=</span><span style='font-size:10.0pt;font-family:"Courier New"'>"<span
style='color:blue'>mapfile</span>"<span style='color:blue'> </span><span
style='color:red'>value</span><span style='color:blue'>=</span>"<span
style='color:blue'>C:\ms4w\Apache\htdocs\...addison.map</span>"<span
style='color:blue'>/><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>…</span><span lang=EN-GB style='font-size:9.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:9.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:9.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'>In your code you want to create the mapfile object by reading
the mapfile path from web.config. So what you need to do is:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:9.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p style='margin-left:36.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>mapObj
map= new mapObj(System.Configuration.ConfigurationManager.AppSettings[“</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>mapfile”]</span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>.toString())</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'>(or whatever the variable in the web.config is called)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:9.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:9.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'>You don’t really want to use a constant to point to the
mapfile...<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:9.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:9.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'>Pano<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Tahoma","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal style='margin-left:36.0pt'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> mapserver-users-bounces@lists.osgeo.org
[mailto:mapserver-users-bounces@lists.osgeo.org] <b>On Behalf Of </b>Suman
Chatterjee<br>
<b>Sent:</b> 09 July 2009 17:50<br>
<b>To:</b> Tamas Szekeres<br>
<b>Cc:</b> mapserver-users@lists.osgeo.org<br>
<b>Subject:</b> RE: [mapserver-users] Object reference not set to an instance
of an object<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal style='margin-left:36.0pt'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:36.0pt'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:navy'>Hi,</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:36.0pt'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:navy'>I corrected my problem. Actually,
I changed the code a little bit. </span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:36.0pt'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:navy'> </span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:36.0pt'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:navy'>Const string MAP_FILE =
“c:/inetpub/wwwroot/Addison.map”</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:36.0pt'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:navy'>Map= new mapObj(MAP_FILE)</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:36.0pt'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:navy'> </span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:36.0pt'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:navy'>The line </span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red'>System.Configuration.ConfigurationManager.AppSettings[“C:/ms4w/Apache/htdocs/mapservertest/Addison.map”]</span>
<o:p></o:p></p>
<p class=MsoNormal style='margin-left:36.0pt'> Is throwing error. No idea
what it is trying to do.<o:p></o:p></p>
<p class=MsoNormal style='margin-left:36.0pt'> <o:p></o:p></p>
<p class=MsoNormal style='margin-left:36.0pt'>Now my application is working
fine in IIS and C#.<o:p></o:p></p>
<p class=MsoNormal style='margin-left:36.0pt'> <o:p></o:p></p>
<p class=MsoNormal style='margin-left:36.0pt'>Suman<o:p></o:p></p>
<p class=MsoNormal style='margin-left:36.0pt'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:navy'> </span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:72.0pt'><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>-----Original Message-----<br>
<b>From:</b> Tamas Szekeres [mailto:szekerest@gmail.com] <br>
<b>Sent:</b> Wednesday, July 08, 2009 6:22 PM<br>
<b>To:</b> Suman Chatterjee<br>
<b>Cc:</b> mapserver-users@lists.osgeo.org<br>
<b>Subject:</b> Re: [mapserver-users] Object reference not set to an instance
of an object</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:72.0pt'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:
12.0pt;margin-left:72.0pt'>Hi Suman,<br>
<br>
I suspect <span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:red'>System.Configuration.ConfigurationManager.AppSettings[“C:/ms4w/Apache/htdocs/mapservertest/Addison.map”]</span>
evaluates to null in your case, and therefore the ToString() operation on the
null reference is failing which problem is not related to the MapScript library
itself.<br>
<br>
Best regards,<br>
<br>
Tamas<o:p></o:p></p>
<div>
<p class=MsoNormal style='margin-left:72.0pt'>2009/7/8 Suman Chatterjee <<a
href="mailto:schatterjee@addisontx.gov">schatterjee@addisontx.gov</a>><o:p></o:p></p>
<div>
<div>
<p style='margin-left:72.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Hi
all,</span><o:p></o:p></p>
<p style='margin-left:72.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I
am trying to develop an application in C# (VS2005) with mapscript. I saw the
material of Paolo. But I am facing a problem </span><o:p></o:p></p>
<p style='margin-left:72.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p style='margin-left:72.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>In
the line </span><o:p></o:p></p>
<p style='margin-left:72.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p style='margin-left:72.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>mapObj
map= new mapObj(System.Configuration.ConfigurationManager.AppSettings[“C:/ms4w/Apache/htdocs/mapservertest/Addison.map”].toString())</span><o:p></o:p></p>
<p style='margin-left:72.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p style='margin-left:72.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>It
is generating the error “ Object reference not set to an instance of an object”</span><o:p></o:p></p>
<p style='margin-left:72.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p style='margin-left:72.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>How
can I correct this? If anyone helps me in correcting it, it will be great.</span><o:p></o:p></p>
<p style='margin-left:72.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p style='margin-left:72.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Suman</span><o:p></o:p></p>
<p style='margin-left:72.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p style='margin-left:72.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
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