Changes between Initial Version and Version 1 of maestro/MaestroAPI/samples/ModifyLayerFilter

Timestamp:

Dec 8, 2008, 8:41:28 AM (15 years ago)

Author:

ksgeograf

Comment:

--

maestro/MaestroAPI/samples/ModifyLayerFilter

@@ +1 @@
+== Utilizing !RuntimeMap via Maestro API ==
+This page describes how to use the MaestroAPI from the [wiki:maestro MapGuide Maestro] project in your own application.
+
+This example shows how to modify the filter of a layer, so it displays another subset of the features.
+The filter is changed only in the current session, meaning that other users won't be affected.
+The code should be placed in an aspx page, otherwise the RegisterStartupScript call won't work.
+
+This example uses the http version, so no MapGuide binaries are required.
+Read about [wiki:maestro/MaestroAPI/basics the difference between LocalNativeConnection and HttpServerConnection here]
+
+(VB.NET)
+{{{
+Imports OSGeo.MapGuide.MaestroAPI
+...
+
+'Read setup from querystring or form
+Dim sessionID As String = Request.Params("SESSIONID")
+Dim mapdefinition As String = Request.Params("MAPDEFINITION")
+Dim layername As String = Request.Params("LAYERNAME")
+Dim newFilter As String = Request.Params("NEWFILTER")
+
+'Replace "myserver" with the server name, or use "localhost"
+Dim host As New Uri("http://myserver/mapguide/mapagent/mapagent.fcgi")
+Dim conn as ServerConnectionI = New HttpServerConnection(host, sessionID, "en", true)
+
+'Use the same naming system as the viewer, when reading the runtime map ID
+Dim mapName as String = new ResourceIdentifier(mapdefinition).Name
+Dim rtMapId as String = new ResourceIdentifier(mapName, ResourceTypes.RuntimeMap, conn.SessionID)
+
+'Load the runtime map
+Dim rtMap as RuntimeClasses.RuntimeMap = conn.GetRuntimeMap(rtMapId)
+Dim rtLayer as RuntimeClasses.RuntimeMapLayer = rtMap.Layers(layername)
+
+'Get the current layer and assing the filter
+Dim layerDefinition as LayerDefinition = conn.GetLayerDefinition(rtLayer.ResourceId)
+Dim vectorLayerDefinition as VectorLayerDefinitionType = layerDefinition.Item
+vectorLayerDefinition.Filter = newFilter
+
+'Save a copy of the layer, temporary, and random name
+rtLayer.ResourceID = new ResourceIdentifier(Guid.NewGuid().ToString(), ResourceTypes.LayerDefinition, conn.SessionID)
+conn.SaveResourceAs(layerDefinition, rtLayer)
+
+'Save the runtime map, pointing to the updated layerdefinition
+conn.SaveRuntimeMap(rtMapId, rtMap)
+
+'Tell the client to refresh
+RegisterStartupScript("key", "<script>GetMapFrame().Refresh();</script>")
+
+}}}