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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> Pano Voudouris
[mailto:pvoudouris@gaiocorp.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> </span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>Thursday, July
09, 2009</span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'> </span></font><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>11:48 AM</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><br>
<b><span style='font-weight:bold'>To:</span></b> Suman Chatterjee<br>
<b><span style='font-weight:bold'>Cc:</span></b>
mapserver-users@lists.osgeo.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapserver-users]
Object reference not set to an instance of an object</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=1 color="#1f497d"
face=Tahoma><span lang=EN-GB style='font-size:9.0pt;font-family:Tahoma;
color:#1F497D'>Hi Suman,</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=1 color="#1f497d"
face=Tahoma><span lang=EN-GB style='font-size:9.0pt;font-family:Tahoma;
color:#1F497D'>Check your web.config file- You probably have an entry similar
to:</span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><font size=2
color=blue face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'><</span></font><font size=2 color="#a31515" face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:#A31515'>appSettings</span></font><font
size=2 color=blue face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:blue'>></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span></font><font
size=2 color="#a31515" face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>add</span></font><font size=2
color=blue face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> </span></font><font size=2 color=red face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:red'>key</span></font><font
size=2 color=blue face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:blue'>=</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>"<font color=blue><span
style='color:blue'>mapfile</span></font>"<font color=blue><span
style='color:blue'> </span></font><font color=red><span style='color:red'>value</span></font><font
color=blue><span style='color:blue'>=</span></font>"<font color=blue><span
style='color:blue'>C:\ms4w\Apache\htdocs\...addison.map</span></font>"<font
color=blue><span style='color:blue'>/></span></font></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>…</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=1 color="#1f497d"
face=Tahoma><span lang=EN-GB style='font-size:9.0pt;font-family:Tahoma;
color:#1F497D'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=1 color="#1f497d"
face=Tahoma><span lang=EN-GB style='font-size:9.0pt;font-family:Tahoma;
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:</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=1 color="#1f497d"
face=Tahoma><span lang=EN-GB style='font-size:9.0pt;font-family:Tahoma;
color:#1F497D'> </span></font></p>
<p style='margin-left:1.0in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>mapObj map= new
mapObj(System.Configuration.ConfigurationManager.AppSettings[“</span></font><font
size=2 color=blue face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:blue'>mapfile”]</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>.toString())</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=1 color="#1f497d"
face=Tahoma><span style='font-size:9.0pt;font-family:Tahoma;color:#1F497D'>(or
whatever the variable in the web.config is called)</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=1 color="#1f497d"
face=Tahoma><span lang=EN-GB style='font-size:9.0pt;font-family:Tahoma;
color:#1F497D'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=1 color="#1f497d"
face=Tahoma><span lang=EN-GB style='font-size:9.0pt;font-family:Tahoma;
color:#1F497D'>You don’t really want to use a constant to point to the
mapfile...</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=1 color="#1f497d"
face=Tahoma><span lang=EN-GB style='font-size:9.0pt;font-family:Tahoma;
color:#1F497D'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=1 color="#1f497d"
face=Tahoma><span lang=EN-GB style='font-size:9.0pt;font-family:Tahoma;
color:#1F497D'>Pano</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=1 color="#1f497d"
face=Tahoma><span style='font-size:9.0pt;font-family:Tahoma;color:#1F497D'> </span></font></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='margin-left:1.0in'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
mapserver-users-bounces@lists.osgeo.org
[mailto:mapserver-users-bounces@lists.osgeo.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Suman Chatterjee<br>
<b><span style='font-weight:bold'>Sent:</span></b> </span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>09 July 2009</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> </span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>17:50</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><br>
<b><span style='font-weight:bold'>To:</span></b> Tamas Szekeres<br>
<b><span style='font-weight:bold'>Cc:</span></b>
mapserver-users@lists.osgeo.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapserver-users]
Object reference not set to an instance of an object</span></font></p>
</div>
</div>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Hi,</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>I
corrected my problem. Actually, I changed the code a little bit. </span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Const
string MAP_FILE = “c:/inetpub/wwwroot/Addison.map”</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Map= new
mapObj(MAP_FILE)</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>The line
</span></font><font size=2 color=red face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:red'>System.Configuration.ConfigurationManager.AppSettings[“C:/ms4w/Apache/htdocs/mapservertest/Addison.map”]</span></font>
</p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> Is throwing error. No idea what it is trying to
do.</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Now my application is working fine in IIS and C#.</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Suman</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:1.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> Tamas Szekeres
[mailto:szekerest@gmail.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> </span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>Wednesday, July
08, 2009</span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'> </span></font><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>6:22 PM</span></font><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><br>
<b><span style='font-weight:bold'>To:</span></b> Suman Chatterjee<br>
<b><span style='font-weight:bold'>Cc:</span></b>
mapserver-users@lists.osgeo.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [mapserver-users]
Object reference not set to an instance of an object</span></font></p>
<p class=MsoNormal style='margin-left:1.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-right:0in;margin-bottom:12.0pt;margin-left:
1.5in'><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>Hi
Suman,<br>
<br>
I suspect </span></font><font size=2 color=red face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:red'>System.Configuration.ConfigurationManager.AppSettings[“C:/ms4w/Apache/htdocs/mapservertest/Addison.map”]</span></font>
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</p>
<div>
<p class=MsoNormal style='margin-left:1.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>2009/7/8 Suman Chatterjee <<a
href="mailto:schatterjee@addisontx.gov">schatterjee@addisontx.gov</a>></span></font></p>
<div>
<div>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Hi all,</span></font></p>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>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></font></p>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>In the line </span></font></p>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>mapObj map= new
mapObj(System.Configuration.ConfigurationManager.AppSettings[“C:/ms4w/Apache/htdocs/mapservertest/Addison.map”].toString())</span></font></p>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>It is generating the error “ Object reference
not set to an instance of an object”</span></font></p>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>How can I correct this? If anyone helps me in
correcting it, it will be great.</span></font></p>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Suman</span></font></p>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
</div>
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.0001pt'><font size=1 face=Arial><span style='font-size:8.0pt;font-family:Arial'>*******************************************************************************************************************
</span></font></p>
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