[mapguide-users] Creating a temporary feature source that is not an SDF file

[Jackie Ng]

If you understand that feature sources are just xml documents that describe a
FDO connection to a particular data store, then
CreateFeatureSource()/MgCreateSdfParams is just a convenience method that
does the following:

1) Create the SDF file, with the specified schema
2) Create an XML feature source document for this created SDF
3) Sets the resource content (feature source) based on the given resource id
4) Uploads the created SDF file as the resource data for the given resource
id

What is so special about MgCreateSdfParams is that it can create the SDF
data store for you (the 1st part). For anything other than SDF, this data
store creation ability is not exposed and you will need to have the data on
hand already or use the FDO API to create the data store. 

However you can achieve the same effect (parts 2, 3 and 4) using
SetResource() and SetResourceData() methods of MgResourceService.

I think in your case, what you want to do is to copy the raster feature
source to your session repository, and modify its configuration document. No
CreateFeatureSource() call is required.

Hope that helps.

- Jackie


adnanc wrote:
> 
> Hello all,
> 
> I am currently serving georeferenced tiffs with the GDAL provider, using a
> config file for indexing them.
> 
> A requirement I have is to enable a user to select an area of interest and
> be able to programmatically generate the config file of tiffs for that
> particular area.  I have been able to complete this functionality using
> the gdal api.
> 
> The next step is to create a session based layer for displaying these
> tiffs, however this also needs a session based feature source.  I have
> created a session based feature source but it is an SDF feature source.  
> 
> Doing the following will add the config file to the feature source, but it
> will not display any tiffs. 
> 
> resourceService.SetResourceData(resID, "ConfigurationDocument", "Stream",
> byteReader);
> 
> The MgFeatureSourceParams class only has one concrete class
> MgCreateSdfParams.
> 
> Has any one had a similar requirement or know of a workround for the above
> problem.
> 
> Thanks for your time,
> 
> Adnan
> 

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