topic Re: vb.net arcobjects determine new create feature geometry in ArcObjects SDK Questions

vb.net arcobjects determine new create feature geometry

LiYao — Mon, 15 Sep 2014 02:44:11 GMT

Dear all,

I want to check whether I can determine the geometry type of the new created feature, is it a point, polyline or polygon?

I am using vb.net and arcmap 10.2.1, thanks.

Re: vb.net arcobjects determine new create feature geometry

FrankHellwich1 — Mon, 15 Sep 2014 07:01:17 GMT

Hi,

you could check the GeometryType of the Shape-property of IFeature:

IFeature feature = CreateFeatureOfUnknownType();

//do some null-checks here

//then

switch(feature.Shape.GeometryType)

{

case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon:

//blah

break;

case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolyline:

//blahblah

break;

//etc

}

Re: vb.net arcobjects determine new create feature geometry

LiYao — Mon, 15 Sep 2014 07:09:22 GMT

Thank you Frank for the quick reply.

I convert the code you provided to vb.net and insert into my vb.net project.

But I get an error:

'CreateFeatureOfUnknownType' is not declared. Is there any library need to import?

Re: vb.net arcobjects determine new create feature geometry

FrankHellwich1 — Mon, 15 Sep 2014 07:12:37 GMT

Sorry - "CreateFeatureOfUnknownType" is no existing function, it's a placeholder in this example for the function you are using to create your feature.

Re: vb.net arcobjects determine new create feature geometry

LiYao — Mon, 15 Sep 2014 07:25:02 GMT

Hi Frank,

I am creating feature in arcmap, not arcobjects.

Re: vb.net arcobjects determine new create feature geometry

FrankHellwich1 — Mon, 15 Sep 2014 08:18:31 GMT

Hi,

so you're looking for a way to run code each time a new feature is created in an edit-session ? This can be done by using Editor-events (see "ArcGIS Desktop editing for developers" in the online help): the editor object that handles editing tasks in ArcMap owns an event "OnCreateFeature" where you can react on new features inserted by the user.

I hope this helps you and meets your needs. Otherwise please give some more informations about the workflow you want to support.

Frank

Re: vb.net arcobjects determine new create feature geometry

LiYao — Mon, 15 Sep 2014 08:34:07 GMT

Hi Frank,

Thanks for the update. Yes I am looking for a way to run code each time a new feature is created in an edit-session. Will follow the instruction you give me.

Re: vb.net arcobjects determine new create feature geometry

LiYao — Mon, 15 Sep 2014 09:28:12 GMT

Hi Frank,

Sorry to trouble you. I have followed the sample code from : http://resources.esri.com/help/9.3/arcgisengine/arcobjects/esriEditor/IEditEvents_OnCreateFeature.htm

I can determine when the new feature is created, but I don't know how to get the geometry type, any hints? So sorry I know little about arcobjects.

Re: vb.net arcobjects determine new create feature geometry

FrankHellwich1 — Sat, 11 Dec 2021 17:01:02 GMT

Hi Li,

no problem. In the event-handler OnCreateFeature you receive the parameter "obj" of type IObject. IFeature inherites from IObject - in this case the parameter obj is an IFeature so that you can cast obj to IFeature and use the code above to check the GeometryType.

I'm no vb-crack but I guess it should look like this (at least similar):

Private Sub OnCreateFeature(ByVal obj As ESRI.ArcGIS.Geodatabase.IObject)
   Dim feature as IFeature
   feature = DirectCast(obj, IFeature)
   if feature.Shape.GeometryType = ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon then
      'do something with a polygonfeature
   else etc.
   ...
 End Sub

regards

Frank

Re: vb.net arcobjects determine new create feature geometry

LiYao — Tue, 16 Sep 2014 00:45:43 GMT

Thanks Frank, it works.

Re: vb.net arcobjects determine new create feature geometry

LiYao — Tue, 16 Sep 2014 02:41:32 GMT

Hi Frank,

Any idea on how to get the layer name of the new created feature? Thanks.

Re: vb.net arcobjects determine new create feature geometry

FrankHellwich1 — Tue, 16 Sep 2014 07:16:01 GMT

Hi Li,

I didn't checked it by myself but I think the following should work: the editor implements the interface IEditLayers which contains the property CurrentLayer. This is the layer the user selected to add the new feature:

Dim uid As UID

uid = New UIDClass()

uid.Value = "esriEditor.Editor"

Dim editor As IEditor

editor = CType(m_application.FindExtensionByCLSID(uid), IEditor)

Dim editLayers as IEditLayers

editLayers = CType(editor, IEditLayers)

Dim layer as ILayer

layer = editLayers.CurrentLayer

et voila ....

Frank

Re: vb.net arcobjects determine new create feature geometry

LiYao — Tue, 16 Sep 2014 07:37:58 GMT

Hi Frank,

Great...thanks a lot.