If you are invoking SelectFeatures() from MgLayer you need to instantiate
MgMap with an MgSiteConnection object otherwise you'll get an Exception
- Jackie
deakaron wrote:
>
> Thanks for your answer.
>
> Now I have another problem, I have the following code that throws an
> exception whenever I try to read features from any layer of the Sheboygan
> map.
>
> import org.osgeo.mapguide.MapGuideJavaApi;
> import org.osgeo.mapguide.MgException;
> import org.osgeo.mapguide.MgFeatureQueryOptions;
> import org.osgeo.mapguide.MgFeatureService;
> import org.osgeo.mapguide.MgLayerBase;
> import org.osgeo.mapguide.MgMap;
> import org.osgeo.mapguide.MgRenderingService;
> import org.osgeo.mapguide.MgResourceIdentifier;
> import org.osgeo.mapguide.MgResourceService;
> import org.osgeo.mapguide.MgServiceType;
> import org.osgeo.mapguide.MgSite;
> import org.osgeo.mapguide.MgSiteConnection;
> import org.osgeo.mapguide.MgUserInformation;
>
> public class Program {
>
> /**
> * @param args
> */
> public static void main(String[] args) {
> try {
> MgResourceIdentifier mapDefid = new
> MgResourceIdentifier(
>
> "Library://Samples/Sheboygan/Maps/Sheboygan.MapDefinition");
> try {
>
> MapGuideJavaApi.MgInitializeWebTier("C:\\webconfig.ini");
> } catch (Exception ex) {
> ex.printStackTrace();
> }
> MgUserInformation userInfo = new
> MgUserInformation("Anonymous", "");
> MgSite site = new MgSite();
> site.Open(userInfo);
> String sessionId = site.CreateSession();
> site.Close();
>
> MgSiteConnection siteConnection = new
> MgSiteConnection();
> siteConnection.Open(new MgUserInformation(sessionId));
> MgResourceService service = (MgResourceService)
> siteConnection
>
> .CreateService(MgServiceType.ResourceService);
> MgResourceService resourceService =
> (MgResourceService)siteConnection.CreateService(MgServiceType.ResourceService);
> MgMap map = new MgMap();
> map.Open(resourceService, "Sheboygan");
> MgRenderingService renderingService =
> (MgRenderingService)
> siteConnection
>
> .CreateService(MgServiceType.RenderingService);
> MgFeatureService featureService = (MgFeatureService)
> siteConnection
>
> .CreateService(MgServiceType.FeatureService);
> /**
> * Make all layers visible
> */
> for (int i = 0; i < map.GetLayers().GetCount(); i++) {
> MgFeatureQueryOptions queryOptions = new
> MgFeatureQueryOptions();
> queryOptions.SetFilter("Autogenerated_SDF_ID =
> 1");
> MgLayerBase layer = map.GetLayers().GetItem(i);
> layer.SetVisible(true);
> try {
> layer.SelectFeatures(queryOptions);
> } catch (Exception ex) {
> ex.printStackTrace();
> }
> System.out.println("Layer name: " +
> layer.GetName());
> }
> } catch (MgException ex) {
> ex.printStackTrace();
> }
> }
>
> }
>
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