Get All Inserted Blocks

[meck]

We have drawigs that many blocks references in them. All I need to do is know which blocks have been inserted in the drawing. I'm using VB.net 2010 and AutoCAD 2013. Here is my code...

Dim BlockSet AsAcadSelectionSet

Try

BlockSet = oAcadApp.ActiveDocument.SelectionSets.Add("InsertedBlocks")

Catch ex AsException

BlockSet = oAcadApp.ActiveDocument.SelectionSets.Item("InsertedBlocks")

BlockSet.Clear()

EndTry

Dim FilterType(0) AsInt16

Dim FilterData(0) AsObject

FilterType(0) = 0

FilterData(0) = "INSERT"

Dim FilterTypeObject AsObject

Dim FilterDataObject AsObject

FilterTypeObject = FilterType

FilterDataObject = FilterData

BlockSet.Select(AcSelect.acSelectionSetAll, , , FilterTypeObject, FilterDataObject)

MsgBox(BlockSet.Count)

I believe my lack of knowledge on the filtering is my biggest problem. In there a reference to all the types of filters that can be used?

I haven't been doing a lot of AutoCAD programming. Is there a help file like there is with Inventor?