Hi,

I am trying to use a fairly old library with VB.Net

It is COM based, so I have just added a reference to it and that bit is OK.

The problem is that the main object that needs to be created, must be done
from a DLL call.  In VB6, this was just:

Private Declare Function GetEngineObject Lib "FREngine.dll" (engineObj As
FREngine.Engine) As Long

Sub Init
   Dim Engine As FREngine.Engine
   Dim Success As Integer '0=success

   Success=GetEngineObject(Engine)
End Sub

------------------------

For VB.Net, this fails, returning an invalid pointer error code.

I presume that the declare should become:

Private Declare Function GetEngineObject Lib "FREngine.dll" (ByRef engineObj
As IntPtr) As Int32

The call to this function then succeeds, however, how do I marshall the
IntPtr to the Engine object in order to be able to use it.  And is that all
I need to do?

Any help on this would be greatly appreciated,

Chris