[mapserver-users] Object reference not set to an instance of an object

Pano Voudouris pvoudouris at gaiocorp.com
Thu Jul 9 12:48:06 EDT 2009

Hi Suman,

Check your web.config file- You probably have an entry similar to:


        <add key="mapfile" value="C:\ms4w\Apache\htdocs\...addison.map"/>



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:


mapObj map= new

(or whatever the variable in the web.config is called)


You don't really want to use a constant to point to the mapfile...




From: mapserver-users-bounces at lists.osgeo.org
[mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Suman
Sent: 09 July 2009 17:50
To: Tamas Szekeres
Cc: mapserver-users at lists.osgeo.org
Subject: RE: [mapserver-users] Object reference not set to an instance of an



I corrected my problem. Actually, I changed the code a little bit. 


Const string MAP_FILE = "c:/inetpub/wwwroot/Addison.map"

Map= new mapObj(MAP_FILE)


The line

 Is throwing error. No idea what it is trying to do.


Now my application is working fine in IIS and C#.




-----Original Message-----
From: Tamas Szekeres [mailto:szekerest at gmail.com] 
Sent: Wednesday, July 08, 2009 6:22 PM
To: Suman Chatterjee
Cc: mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] Object reference not set to an instance of an


Hi Suman,

I suspect
/mapservertest/Addison.map"]  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.

Best regards,


2009/7/8 Suman Chatterjee <schatterjee at addisontx.gov>

Hi all,

I am trying to develop an application in C# (VS2005) with mapscript. I saw
the material of Paolo. But I am facing a problem 


In the line 


mapObj map= new


It is generating the error " Object reference not set to an instance of an


How can I correct this? If anyone helps me in correcting it, it will be






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