I am trying to access the DataType property of a Layer in the TOC in ArcMap. The layer is added from a web service as an IMapServerRESTLayer. The Data Type property is listed with Layer -> Properties -> source as in the following screen shot.
The map layer has a Type Of ICompositeLayer. It is a basemap.
Things I've tried.
It cannot be cast as a IFeatureLayer. I have looked at the Carto Object Model Diagram, and cannot find a DataLayer property on anything except IMobileLayerInfo. and a similar ServiceDataType on IImageServerLayer. Tried making interface casts toward these objects but failed.
Looked at using IComProperty Sheets … managed to create an unpopulated version but think this not the way to go.
I am programming in VB.Net (but can read C#) in ArcGIS 10.2 using VS2010
Any ideas?
Here is the code I have been using to test retrieve the layer and test it.
This is the on click method for a command button within an ArcMap Addin. It's part of a bigger toolbar. There are comments on the outcome of various parts of the code.
Protected Overrides Sub OnClick()
Const csProceedureName As String = "cmdListBaseMap_OnClick"
MsgBox("In " & csProceedureName & vbNewLine & My.ThisAddIn.Name & vbNewLine & " Version " & My.ThisAddIn.Version & vbNewLine & " Date " & My.ThisAddIn.Date)
Try
Dim pApp As IApplication
Dim pMxDoc As IMxDocument
Dim pMap As IMap
Dim pView As IActiveView
Dim resturl As String
'resturl = "http://services.thelist.tas.gov.au/arcgis/rest/services/Basemaps/Topographic/ImageServer/?f=lyr&v=9.3" ' v1 ' works
resturl = "http://services.thelist.tas.gov.au/arcgis/rest/services/Basemaps/Topographic/ImageServer/?f=lyr" ' v2 ' works
'resturl = "http://services.thelist.tas.gov.au/arcgis/services/Basemaps/Topographic/ImageServer" ' v3 ' does not work, does not leave a connection
' there was a problem getting the interface to work.
' In addition to carto needed to include ESRI.ArcGIS.DataSourceRaster
Dim RESTLayer As IMapServerRESTLayer
RESTLayer = New MapServerRESTLayer
Dim pLayer As ILayer
Dim pFLayer As IFeatureLayer
Dim pGenProperties As ILayerGeneralProperties
Dim Mouse_cursor As IMouseCursor = New MouseCursor
Mouse_cursor.SetCursor(2)
pApp = My.ArcMap.Application
pMxDoc = pApp.Document
pMap = pMxDoc.FocusMap
pView = pMxDoc.ActiveView
' Use web HttpWebRequest to see if connection OK and so can retrieve file
Dim request_json_url As String = "http://services.thelist.tas.gov.au/arcgis/rest/services/Basemaps/Topographic/ImageServer/?f=json"
Dim request As HttpWebRequest = DirectCast(HttpWebRequest.Create(request_json_url), HttpWebRequest)
Dim response As HttpWebResponse = DirectCast(request.GetResponse, HttpWebResponse)
'MsgBox("Doing test " & response.StatusCode.ToString & " " & response.StatusDescription & " " & HttpStatusCode.OK.ToString)
If response.StatusCode = HttpStatusCode.OK Then
' connection and response OK
'MsgBox("Status Code " & response.StatusCode & vbNewLine & " Status description " & response.StatusDescription & vbNewLine & " Encoding " & response.CharacterSet)
' this is one method of getting the json file
'Dim encoding As Text.Encoding = System.Text.Encoding.GetEncoding(response.CharacterSet)
'Dim reader As New StreamReader(response.GetResponseStream(), encoding)
'Dim streamtext As String = reader.ReadToEnd()
'MsgBox(streamtext)
'' use a webclient to check connection, the try cast does exception handling
'Dim wc As WebClient = New WebClient
'Dim response_client As String
' response_client = wc.DownloadString(request_json_url)
' MsgBox(response_client)
' Get basemap
RESTLayer.Connect(resturl)
RESTLayer.TransparentBackground(True)
' this cast works
pLayer = TryCast(RESTLayer, ILayer)
If pLayer Is Nothing Then
MsgBox("Cast from MapServerRESTLayer to Ilayer failed")
Else
MsgBox("Cast from MapServerRESTLayer to Ilayer OK")
End If
'Dim pDataLayer As IDataLayer
''this cast works
'pDataLayer = TryCast(RESTLayer, IDataLayer)
'If pDataLayer Is Nothing Then
' MsgBox("Cast from MapServerRESTLayer to IDataLayer failed")
'Else
' MsgBox("Cast from MapServerRESTLayer to IDataLayer OK -" & pDataLayer.DataSourceName.NameString & "-") ' Name is empty
' ' cast here fails: so no path to IIMageserver
' Dim pServerLayer As IImageServerLayer
' pServerLayer = TryCast(pDataLayer, IImageServerLayer)
' If pServerLayer Is Nothing Then
' MsgBox("Cast from MapServerRESTLayer to IDataLayer to IImageServerLayer failed")
' Else
' MsgBox("Cast from MapServerRESTLayer to IDataLayer to IImageServerLayer OK " & pServerLayer.ServiceInfo.ServiceDataType.ToString)
' End If
'End If
'' this cast fails
'Dim pServerLayer As IImageServerLayer
'pServerLayer = TryCast(RESTLayer, IImageServerLayer)
'If pServerLayer Is Nothing Then
' MsgBox("Cast from MapServerRESTLayer to IImageServerLayer failed")
'Else
' MsgBox("Cast from MapServerRESTLayer to IImageServerLayer OK " & pServerLayer.ServiceInfo.ServiceDataType.ToString)
'End If
'' this cast also fails
'Dim pServerLayerA As IImageServerLayer
'pServerLayerA = TryCast(pLayer, IImageServerLayer)
'If pServerLayerA Is Nothing Then
' MsgBox("Cast from ILayer to IImageServerLayer failed")
'Else
' MsgBox("Cast from ILayer to IImageServerLayer OK " & pServerLayerA.ServiceInfo.ServiceDataType.ToString)
'End If
' This cast sequence fails at first cast
'Dim pMapServerLayer As IMapServerLayer
'pMapServerLayer = TryCast(RESTLayer, IMapServerLayer)
'If pMapServerLayer Is Nothing Then
' MsgBox("Cast from MapServerRESTLayer to IMapServerLayer failed")
'Else
' MsgBox("Cast from MapServerRESTLayer to IMapServerLayer OK")
' Dim pImageServerLayerC As IImageServerLayer
' pImageServerLayerC = TryCast(pLayer, IImageServerLayer)
' If pImageServerLayerC Is Nothing Then
' MsgBox("* Cast from IMapServerLayer to IImageServerLayer failed")
' Else
' MsgBox("* Cast from IMapServerLayer to IImageServerLayer OK " & pImageServerLayerC.ServiceInfo.ServiceDataType.ToString)
' End If
'End If
' cast failed
'Dim ImageServiceInfo As IImageServiceInfo
'ImageServiceInfo = TryCast(pLayer, ImageServiceInfo)
'If ImageServiceInfo Is Nothing Then
' MsgBox("Cast from ILayer to IImageServiceInfo failed")
'Else
' MsgBox("Cast from ILayer to IImageServiceInfo OK " & vbNewLine & _
' " Service Data Type " & ImageServiceInfo.ServiceDataType & vbNewLine & _
' " Service Source Type " & ImageServiceInfo.ServiceSourceType & vbNewLine & _
' " Default Service Properties " & ImageServiceInfo.DefaultServiceProperties)
'End If
' This works
' Returns the Description
' this returns a string with
' "Tasmania Topographic base map", "LIST web service"
' for services and conditions see URL to services and consitions pdf
'
'pGenProperties = TryCast(pLayer, ILayerGeneralProperties)
'If pGenProperties Is Nothing Then
' MsgBox("No general properties")
'Else
' MsgBox("Properties -" & pGenProperties.LayerDescription & "-")
'End If
'' This cast works
'Dim pCompositeLayer As ICompositeLayer2
'pCompositeLayer = TryCast(pLayer, ICompositeLayer2)
'If pCompositeLayer Is Nothing Then
' MsgBox("Cast from ILayer to ICompositeLayer failed")
'Else
' MsgBox("Cast from ILayer to ICompositeLayer OK " & pCompositeLayer.Count.ToString)
'End If
'' This cast also works
'Dim pCompositeLayerA As ICompositeLayer2
'pCompositeLayerA = TryCast(RESTLayer, ICompositeLayer2)
'If pCompositeLayerA Is Nothing Then
' MsgBox("Cast from ReST to ICompositeLayer failed")
'Else
' MsgBox("Cast from REST to ICompositeLayer OK " & pCompositeLayerA.Count.ToString)
'End If
' add layer to map
pMap.AddLayer(pLayer)
pView.Refresh()
' both versions of the imported layer are ILayer, IDataLayer, ICompositeLayer
MsgBox("player " & pLayer.Name & " is of type " & LayerType(pLayer))
MsgBox("RESTLayer " & pLayer.Name & " is of type " & LayerType(pLayer))
pMxDoc.ActiveView.Refresh()
MsgBox("Base map layer " & pLayer.Name & "has been added")
Else
MsgBox("ERROR ( " & csProceedureName & " ) " & response.StatusCode & vbNewLine & response.StatusDescription)
End If
Mouse_cursor.SetCursor(0)
Catch ex As Exception
MsgBox("Error " & ex.Message)
End Try
End Sub
Protected Overrides Sub OnUpdate()
End Sub
Public Function LayerType(ByVal pLayer As ILayer) As String
' return layer TypeOf
LayerType = ""
If TypeOf pLayer Is ILayer Then
LayerType = LayerType & " " & "ILayer"
End If
If TypeOf pLayer Is IACAcetateLayer Then
LayerType = LayerType & " " & "IACAcetateLayer"
End If
If TypeOf pLayer Is IACImageLayer Then
LayerType = LayerType & " " & "IACImageLayer"
End If
If TypeOf pLayer Is IACFeatureLayer Then
LayerType = LayerType & " " & "IACFeatureLayer"
End If
If TypeOf pLayer Is IACFeatureLayer Then
LayerType = LayerType & " " & "IACFeatureLayer"
End If
If TypeOf pLayer Is IACLayer Then
LayerType = LayerType & " " & "IACLayer"
End If
If TypeOf pLayer Is IAnnotationLayer Then
LayerType = LayerType & " " & "IAnnotationLayer"
End If
If TypeOf pLayer Is IAnnotationSublayer Then
LayerType = LayerType & " " & "IAnnotationSublayer"
End If
If TypeOf pLayer Is ICadastralFabricLayer Then
LayerType = LayerType & " " & "ICadastralFabricLayer"
End If
If TypeOf pLayer Is ICadLayer Then
LayerType = LayerType & " " & "ICadLayer"
End If
If TypeOf pLayer Is ICompositeGraphicsLayer Then
LayerType = LayerType & " " & "ICompositeGraphicsLayer"
End If
If TypeOf pLayer Is ICompositeLayer Then
LayerType = LayerType & " " & "ICompositeLayer"
End If
If TypeOf pLayer Is ICoverageAnnotationLayer Then
LayerType = LayerType & " " & "ICoverageAnnotationLayer"
End If
If TypeOf pLayer Is IDataLayer Then
LayerType = LayerType & " " & "IDataLayer"
End If
If TypeOf pLayer Is IDimensionLayer Then
LayerType = LayerType & " " & "IDimensionLayer"
End If
If TypeOf pLayer Is IFDOGraphicsLayer Then
LayerType = LayerType & " " & "IFDOGraphicsLayer"
End If
If TypeOf pLayer Is IFeatureLayer Then
LayerType = LayerType & " " & "IFeatureLayer"
End If
If TypeOf pLayer Is IGdbRasterCatalogLayer Then
LayerType = LayerType & " " & "IGdbRasterCatalogLayer"
End If
If TypeOf pLayer Is IGeoFeatureLayer Then
LayerType = LayerType & " " & "IGeoFeatureLayer"
End If
If TypeOf pLayer Is IGraphicsLayer Then
LayerType = LayerType & " " & "IGraphicsLayer"
End If
If TypeOf pLayer Is IGroupLayer Then
LayerType = LayerType & " " & "IGroupLayer"
End If
If TypeOf pLayer Is IIMSMapLayer Then
LayerType = LayerType & " " & "IIMSMapLayer"
End If
If TypeOf pLayer Is IIMSSubLayer Then
LayerType = LayerType & " " & "IIMSSubLayer"
End If
If TypeOf pLayer Is IImageServerLayer Then
LayerType = LayerType & " " & "IImageServerLayer"
End If
If TypeOf pLayer Is IImageServerLayer2 Then
LayerType = LayerType & " " & "IImageServerLayer2"
End If
If TypeOf pLayer Is IImageServerLayer3 Then
LayerType = LayerType & " " & "IImageServerLayer3"
End If
If TypeOf pLayer Is IMapServerLayer Then
LayerType = LayerType & " " & "IMapServerLayer"
End If
If TypeOf pLayer Is IMapServerSublayer Then
LayerType = LayerType & " " & "IMapServerSublayer"
End If
If TypeOf pLayer Is INetworkLayer Then
LayerType = LayerType & " " & "INetworkLayer"
End If
If TypeOf pLayer Is IRasterCatalogLayer Then
LayerType = LayerType & " " & "IRasterCatalogLayer"
End If
If TypeOf pLayer Is IRasterLayer Then
LayerType = LayerType & " " & "IRasterLayer"
End If
If TypeOf pLayer Is ITemporaryLayer Then
LayerType = LayerType & " " & "ITemporaryLayer"
End If
If TypeOf pLayer Is ITerrainLayer Then
LayerType = LayerType & " " & "ITerrainLayer"
End If
If TypeOf pLayer Is ITinLayer Then
LayerType = LayerType & " " & "ITinLayer"
End If
If TypeOf pLayer Is ITopologyLayer Then
LayerType = LayerType & " " & "ITopologyLayer"
End If
If TypeOf pLayer Is IWMSGroupLayer Then
LayerType = LayerType & " " & "IWMSGroupLayer"
End If
If TypeOf pLayer Is IWMSLayer Then
LayerType = LayerType & " " & "IWMSLayer"
End If
If TypeOf pLayer Is IWMSMapLayer Then
LayerType = LayerType & " " & "IWMSMapLayer"
End If
'Else
' LayerType = "UnKnown"
'End If
End Function
Best Answer
I can check the URL in your snapshot and say the layer you are trying to work with is an ImageServer Layer.
http://services.thelist.tas.gov.au/arcgis/rest/services/Basemaps/Topographic/ImageServer
You can not access an imageserver layer as a feature layer.
You can only access map server layers that have "Feature Access" enabled, as a feature layer. (e.g. Cast them to IFeatureLayer)