[mapguide-users] MgLayerBase::GetClassDefinition fails on MGOS1.2RC2

[Rex Szeto (Intern)]

Hi Takashige,

In your code, instead of using MgLayerBase, cast it to MgLayer.

MgLayer layer = (MgLayer)GetLayerByName(map, layerName);
MgClassDefinition classDef = layer.GetClassDefinition();

Regards,
Rex


-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Takashige
Nakagawa
Sent: Thursday, August 23, 2007 11:58 PM
To: MapGuide Users Mail List
Subject: [mapguide-users] MgLayerBase::GetClassDefinition fails on
MGOS1.2RC2

Hi, all.

Now I'm writing some test programs on MGOS 1.2 RC2. In the codes below, 
MgLayerBase::GetClassDefinition causes an exception "Class not found."
When I use MgFeatureService ( as I do on Ver 1.1 ) instead , everything 
works fine.

Is there something I do wrong?

Regards.

Takashige

----Codes-------------------------------------------
    String doTest()
    {
        NameValueCollection parameters = GetRequestParameters(Request);
        String sessionId = GetParameter(parameters, "_session_id_");
        String mapName = GetParameter(parameters, "_mapname_");
        String layerName = GetParameter(parameters, "_layername_");
        MgUserInformation userInfo = new MgUserInformation(sessionId);
        MgSiteConnection siteConnection = new MgSiteConnection();
        siteConnection.Open(userInfo);
        MgMap map = new MgMap(siteConnection);
        map.Open(mapName);
        MgLayerBase layer = GetLayerByName(map, layerName);

        // Version1.1 ******* Works fine on ver 1.2 !
        //MgFeatureService featureService = _
        //
siteConnection.CreateService(MgServiceType.FeatureService) as 
MgFeatureService;
        //MgClassDefinition classDef =
GetClassDefinitionV11(featureService, 
layer);

        // Version1.2  ******* Fails!  What's wrong??
*******************
        MgClassDefinition classDef = layer.GetClassDefinition();

        return layerName;
    }

    MgClassDefinition GetClassDefinitionV11(MgFeatureService
featureService, 
MgLayerBase layer)
    {
        String featureSourceId = layer.GetFeatureSourceId();
        MgResourceIdentifier featureSourceResId = new 
MgResourceIdentifier(featureSourceId);
        String featureClassName = layer.GetFeatureClassName();
        String[] schemaClass = featureClassName.Split(new char[] { ':'
});
        String schemaName = schemaClass[0];
        String className = schemaClass[1];
        return featureService.GetClassDefinition(featureSourceResId, 
schemaName, className);
    }

    NameValueCollection GetRequestParameters(HttpRequest request)
    {
        if ("POST" == request.HttpMethod)
        {
            return request.Form;
        }
        else
        {
            return request.QueryString;
        }
    }

    String GetParameter(NameValueCollection parameters, String name)
    {
        String strval = parameters[name];
        if (null == strval)
            return "";

        return strval.Trim();
    }

    MgLayerBase GetLayerByName(MgMap map, String layerName)
    {
        MgLayerCollection layers = map.GetLayers();
        MgLayerBase layer = null;
        for (int i = 0; i < layers.GetCount(); i++)
        {
            MgLayerBase nextLayer = layers.GetItem(i);
            if (nextLayer.GetName() == layerName)
            {
                layer = nextLayer;
                break;
            }
        }
        return layer;
    }
------------------------------------------------------------------------

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