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Is it possible to use the arcpy.mapping classes within visual studio?

maxsteinbrenner

So is there a way you can use arcpy code from within a vb.net project? Currently have a pretty big custom set of addin's written in vb.net and can't figure out how to do one part of what i want with .net code. In acpy it is easy so i was wondering if i could somehow stick a little arcpy code in the visual studio project?

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Accepted answers

Hornbydd

Again it looks like you are mixing the two types of geo-processors. See the VBA code below, note the type of geoprocessor I am using and how I call the tool by it's name

Dim pGeoProcessor As IGeoProcessor
Set pGeoProcessor = New GeoProcessor
With pGeoProcessor
    .OverwriteOutput = True
    .LogHistory = False
    .AddOutputsToMap = False
    .TemporaryMapLayers = True
End With
Dim pGeoProcessorResult As IGeoProcessorResult
Dim pVariantArray As IVariantArray
Set pVariantArray = New VarArray
Set pVariantArray = New VarArray
With pVariantArray
    .Add pFeatureLayer_Urban
    .Add "INTERSECT"
    .Add pFeatureLayer_Catchments
    .Add ""
    .Add "NEW_SELECTION"
End With
Set pGeoProcessorResult = pGeoProcessor.Execute("SelectLayerByLocation", pVariantArray, Nothing)

All comments

kenbuja

I don't know if there are computational advantages of using the managed assemblies. I've gravitated to them because you know exactly which parameter is getting set (and in no particular order) as opposed to having to remember their correct order when adding them to the IVariantArray

Hornbydd

Hi Ken Buja,

I've always wondered if there was an advantage in using managed assemblies (the way you have shown) compared to the way I have done it? I've continued to use the method I use to call geo-processing tools simply because it was the method I first learnt and I can remember how to do it!

Duncan

kenbuja

I've always went the route of using the managed assemblies when using the Geoprocessor in .NET. Here's an example of how I run the Dissolve tool, using inputs representing either feature classes or feature layers (either as path names or as ArcObjects) and all the associated functions to execute the Geoprocessor and return a feature class.

Dim GP As ESRI.ArcGIS.Geoprocessor.Geoprocessor  'set in the beginning of the code


Friend Function DissolveDataset(ByVal InputName As Object, ByVal DissolveField As String, ByVal StatsFields As String, ByVal OutputName As String) As ESRI.ArcGIS.Geodatabase.IFeatureClass

    Dim DissolveDS As New ESRI.ArcGIS.DataManagementTools.Dissolve
    Dim Result As ESRI.ArcGIS.Geoprocessing.IGeoProcessorResult2

    Try
        Using releaser As New ESRI.ArcGIS.ADF.ComReleaser
            releaser.ManageLifetime(DissolveDS)
            DissolveDS.in_features = InputName
            DissolveDS.dissolve_field = DissolveField
            DissolveDS.statistics_fields = StatsFields
            DissolveDS.out_feature_class = OutputName

            Result = RunTool(DissolveDS, Nothing)
            If Result Is Nothing Then
                System.Windows.Forms.MessageBox.Show("Could not dissolve dataset")
                Return Nothing
            End If

            Return ReturnObjectfromResult(Result, "Feature Class")
        End Using

    Catch ex As Exception
        System.Windows.Forms.MessageBox.Show(ex.ToString, "Dissolve error")
        Return Nothing
    End Try

End Function

Friend Function RunTool(ByVal Process As ESRI.ArcGIS.Geoprocessor.IGPProcess, ByVal TC As ESRI.ArcGIS.esriSystem.ITrackCancel2) As ESRI.ArcGIS.Geoprocessing.IGeoProcessorResult2

    Dim Result As ESRI.ArcGIS.Geoprocessing.IGeoProcessorResult2

    Try
        Result = CType(GP.Execute(Process, Nothing), ESRI.ArcGIS.Geoprocessing.IGeoProcessorResult2)
        If Result.Status <> ESRI.ArcGIS.esriSystem.esriJobStatus.esriJobSucceeded Then ReturnMessages(Result, "Geoprocessing Error")
        GP.ClearMessages()
    Catch ex As Exception
        ReturnMessages(Result, "Fail")
        System.Windows.Forms.MessageBox.Show(ex.ToString, "Run Geoprocessor")
    End Try

    Return Result

End Function

Private Sub ReturnMessages(ByVal pResult As ESRI.ArcGIS.Geoprocessing.IGeoProcessorResult2, ByVal Title As String)

    Dim ErrorMessage As String

    If pResult.MessageCount > 0 Then
        For Count As Integer = 0 To pResult.MessageCount - 1
            ErrorMessage += pResult.GetMessage(Count)
        Next
    End If

    System.Windows.Forms.MessageBox.Show(ErrorMessage, Title)

End Sub

Friend Function ReturnObjectfromResult(ByVal result As ESRI.ArcGIS.Geoprocessing.IGeoProcessorResult2, ByVal Type As String) As Object

    Dim GPVal As ESRI.ArcGIS.Geodatabase.IGPValue
    Dim InMemFC As String
    Dim GPUtil As ESRI.ArcGIS.Geoprocessing.IGPUtilities3 = New ESRI.ArcGIS.Geoprocessing.GPUtilities

    Try
        GPVal = result.GetOutput(0)
        InMemFC = GPVal.GetAsText()

        Select Case Type
            Case "Feature Class"
                Return GPUtil.OpenFeatureClassFromString(InMemFC)
            Case "Table"
                Return GPUtil.OpenTableFromString(InMemFC)
        End Select

    Catch ex As Exception
        System.Windows.Forms.MessageBox.Show(ex.ToString, "Return FeatureClass error")
        Return Nothing
    End Try

End Function

maxsteinbrenner

i was wondering how to do that!

better?

thx max

maxsteinbrenner

Duncan,

Thanks for trying to help me through this...

I am not sure i understand what you mean though. Do you mean pass the variables in in a traditional vb.net sense like?

Private Sub Export_to_shp()

Dim GP As IGeoProcessor = New ESRI.ArcGIS.Geoprocessing.GeoProcessor

'Declare variables for input

Dim in_features As IFeatureLayer

Dim out_path As String

Dim out_name As String

Dim m_pMxDoc As ESRI.ArcGIS.ArcMapUI.IMxDocument

m_pMxDoc = My.ArcMap.Document

in_features = m_pMxDoc.FocusMap.Layer(2)

out_path = "H:\SwiftReach"

out_name = "test.shp"

GP.FeatureclassToFeatureclass_conversion(in_features, out_path, out_name)

End Sub

Because when i try that in like in the code above; it blows up at:

GP.FeatureclassToFeatureclass_conversion(in_features, out_path, out_name)

with the error

NullReferenceException was unhandled

That is why i started to try to go down the rabbit hole of trying to call the variables through some other more "arcpy" like means.

I am beginning to think as Dan had mentioned above that there is too much mixing of styles here maybe? And that this may not work as i'd imagined it... Would be cool though; the arcpy tools are so much more intuitive to me.

Any continued ideas would be greatly appreciated!

Hornbydd

Firstly you would not set your pointer to nothing as you have you need to point it to the GeoProcessor

Dim GP As IGeoProcessor = New GeoProcessor
GP.Execute(.....)

If you want to access individual layers you need to use IMXDocument.focusmap.layer(x) where x is the index position. Suggest searching for examples in help and on forum.

DanPatterson_Retired

I am beginning to think that trying to consolidate everything into one, might not be such a good idea. Arcobjects I am sure can accommodate this, but arcpy and python are the preferred combinations I suspect... perhaps that is the py part of arcpy.

maxsteinbrenner

Dan and Duncan,

thanks for the replys!

I was able to access the IGeoProcessor

Dim GP As IGeoProcessor = Nothing (works!)

My problem is hooking into the active map document and using the layers within the mxd i am working with in the vb.net project.

stuff like

mxd = arcpy.mapping.MapDocument('CURRENT')

in_features = arcpy.mapping.ListLayers(mxd)[0]

(stolen from arcpy scripts i found on the internet)

my first goal is to get something like this to run:

GP.FeatureclassToFeatureclass_conversion(in_features, out_path, out_name)

but to have it reference a layer within the mxd i am working for the in_features.

Hornbydd

Just an idea but if what you can do easily in arcpy is actually calling one or more geo-processing tools then you could call the same tools within ArcObjects. The key interface I use is IGeoProcessor. There are loads of examples on this forum showing you how to call existing geo-processing tools.

DanPatterson_Retired

I don't use it, or net stuff in general, but there is a whole section on arcpy access which you will have to troll through

http://desktop.arcgis.com/en/arcobjects/latest/net/webframe.htm#aecfa7f0-ac98-4a1c-ae36-f012211efb3c.htm

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