[Mapserver-users] virtual spatial data

Zak James zak-ms at hoppsan.org
Wed May 26 20:56:23 EDT 2004

Jenu, Chip:

If it works with ogrinfo, our experience is that either the mapserver  
binary is too old as Daniel says, or the ODBC connection is expecting  
some environment variables to be available that are present when  
running ogrinfo but absent from within the webserver process.

Other users on the list may have more to contribute, but I haven't  
tested with either IIS or MS SQL Server so you are right on the  
bleeding edge. Since ogrinfo is working there must be only a minor  
(though fatal!) problem. Is your ODBC DSN a System DSN? User DSNs don't  

If you can set the CPL_DEBUG environment variable to ON, OGR will  
provide you with more information about what is succeeding and what is  
failing. I'm only familiar with doing that via apache, however.

Is it possible for either of you to test using different ODBC drivers  
(perhaps to a different db) or different webserver? The text file ODBC  
driver is a good one to try on Windows as it definitely doesn't require  
environment variables and is easy to set up.

Zak James
Applications and Software Development
DM Solutions Group Inc.

> This is an interesting problem... I'm getting the same error with my
> setup:
> msDrawMap(): Image handling error. Failed to draw layer named
> 'MyVirtualLayer'.
> msOGRFileOpen(): OGR error. Open failed for OGR connection
> `D:/inetpub/wwwroot/MapServer/PointTest/data/virtual.ovf'. File not
> found or unsupported format.
> I downloaded the latest(?) beta from the MS site: MS 4.2b, and it is
> still giving me the same error. I too have done all of the appropriate
> checks with ogrinfo.
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