[mapguide-users] GetMapImage

[Chris Claydon]

The XML for the feature set seems to be valid in both cases, but the second one contains an empty feature set. Does the feature reader you get back from layer.SelectFeatures actually contain any features?

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of wordsy
Sent: Monday, January 05, 2009 9:41 AM
To: mapguide-users at lists.osgeo.org
Subject: Re: [mapguide-users] GetMapImage




wordsy wrote:
>
> I am hoping someone here has had the same problem.
>
> My scenario:
>
> I have a grid of items that are on a map (layers etc).  This page does not
> have the main map.  I have a requirement where a user can click on the
> item in the grid (asp.net datagrid) and they will be able to see a preview
> of the item they have clicked on.  I am using the GetMapImage in a user
> control.  I have successfully created the control so it goes to the item
> picked in the list and renders that image.  The only problem I have is
> actually selecting the item in the map by.
>
> Here is the code I am using:
>
>  string searchstring = "SpatialKey = '" + this.RadTextBox1.Text + "'";
>
>             MgFeatureQueryOptions DisplayIdQuery = new
> MgFeatureQueryOptions();
>
>             DisplayIdQuery.SetFilter(searchstring);
>
>             MgUserInformation userInfo = new
> MgUserInformation(Session[SessionStateBase.SESSION_GIS_SESSION_ID].ToString());
>             MgSiteConnection siteConnection = new MgSiteConnection();
>             siteConnection.Open(userInfo);
>
>             // get the map
>             MgMap map = new MgMap(siteConnection);
>
> map.Open(Session[SessionStateBase.SESSION_MUNICIPALITY].ToString());
>
>             MgAgfReaderWriter geometryReaderWriter = new
> MgAgfReaderWriter();
>
>             MgLayer layer = map.GetLayers().GetItem(LayerName) as MgLayer;
>             MgFeatureReader featureReader =
> layer.SelectFeatures(DisplayIdQuery);
>
>             featureReader.ReadNext();
>
>             MgByteReader byteReader =
> featureReader.GetGeometry("Geometry");
>             MgGeometry geometry = geometryReaderWriter.Read(byteReader);
>             MgPoint point = geometry.GetCentroid();
>
>             double x = point.GetCoordinate().GetX();
>             double y = point.GetCoordinate().GetY();
>
>             MgSelection selection = new MgSelection(map);
>
>            /////THIS IS WHERE I AM HAVING THE PROBLEM/////
>             selection.AddFeatures(layer, featureReader, 0);
>             //selection.Add(layer.GetObjectId(), map.GetClassName(),
> this.RadTextBox1.Text);
>
>             String selectionXml = selection.ToXml();
>             selectionXml = Regex.Replace(Server.UrlEncode(selectionXml),
> "%.{2}", new MatchEvaluator(CapitalizeEncoding));
>
>             this.Image1.ImageUrl =
> "http://vmedmgis/mapguide/mapagent/mapagent.fcgi?OPERATION=GETMAPIMAGE&VERSION=1.0.0&SESSION="
> + Session[SessionStateBase.SESSION_GIS_SESSION_ID] + "&MAPNAME=" +
> Session[SessionStateBase.SESSION_MUNICIPALITY] +
> "&LOCALE=en&MAPDEFINITION=Library%3A%2F%2F&FORMAT=PNG&SELECTION=" +
> selectionXml + "&SETVIEWCENTERX=" + x.ToString() + "&SETVIEWCENTERY=" +
> y.ToString() + "&SETVIEWSCALE=" + ViewScale.ToString() +
> "&SETDISPLAYDPI=75&SETDISPLAYWIDTH=375&SETDISPLAYHEIGHT=250&SHOWLAYERS=&HIDELAYERS=&SHOWGROUPS=&HIDEGROUPS=&CLIP=0";
>
> When I select the item on the map and get the selectionXml javascript
> function I get
>
> <?xml version="1.0" encoding="UTF-8"?>
> <FeatureSet>
> <Layer id="6b85dffc-0000-1000-8000-005056c00008">
> <Class id="Classname">
> <ID>3QEAAA==</ID>
> </Class>
> </Layer>
> </FeatureSet>
>
> but when I run String selectionXml = selection.ToXml();
>
> my code doesn't resemble the javascript xml.  Below is what I get.
>
> <?xml version=\"1.0\" encoding=\"UTF-8\"?>
> <FeatureSet xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"
> xsi:noNamespaceSchemaLocation=\"FeatureSet-1.0.0.xsd\">
> </FeatureSet>
>
> As you can see, there is a major difference between the 2 selection xml.
>
> When I pass the selection xml generated by the server side code to the
> GetMapImage function the formats aren't the same.
>
> Any ideas why?  Thanks for any help in advance.
>
>
>

--
View this message in context: http://n2.nabble.com/GetMapImage-tp2090701p2113621.html
Sent from the MapGuide Users mailing list archive at Nabble.com.

_______________________________________________
mapguide-users mailing list
mapguide-users at lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/mapguide-users