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

[Pano Voudouris]

Hi Suman,

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

<appSettings>

        <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
mapObj(System.Configuration.ConfigurationManager.AppSettings["mapfile"].toSt
ring())

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

 

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

 

Pano

 

From: mapserver-users-bounces at lists.osgeo.org
[mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Suman
Chatterjee
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
object

 

Hi,

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
System.Configuration.ConfigurationManager.AppSettings["C:/ms4w/Apache/htdocs
/mapservertest/Addison.map"]  

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

 

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

 

Suman

 

-----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
object

 

Hi Suman,

I suspect
System.Configuration.ConfigurationManager.AppSettings["C:/ms4w/Apache/htdocs
/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,

Tamas

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
mapObj(System.Configuration.ConfigurationManager.AppSettings["C:/ms4w/Apache
/htdocs/mapservertest/Addison.map"].toString())

 

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

 

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

 

Suman

 

 

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