Cards.DLL & VB.NET

I'm new to game programming in VB.NET. I need some help porting a card game from VB6 to VB.NET. I'd appreciate any help you can give.

I get an error the first time I call cdtInit. The error says "Object reference not set to an instance of an object".

I declare the cdtInit function in a global module & call it from my main form.load event.

Declaration is:

Declare Function cdtInit Lib "Cards.Dll" (ByVal dX As Long, ByVal dY As Long) As Long

Call is:

Dim X As Long, Y As Long
cdtInit(X, Y)

This sound so simple. What am I doing wrong?

I think you are supposed to use:

VB Code:

Declare [b]Ansi[/b] Function ...

To import regular DLL functions. VB.NET DLLs don't require the Ansi, I believe.

I think you're right that the ANSI is not required. I get the error with or without it in the function declaration.