[RESOLVED] How to access Module items in a DLL.

[JA12]

I'm having to convert an OLD VB6 application to VB.NET.

There are bits of the VB6 stuff that will not convert and what I'm trying to do is create a DLL that can do those bits and return a Type value.

I've finally got the thing compiling, but I'm now having a problem as to how to get the values back to my VB.NET calling routine.

VB6 does NOT allow User Defined Types to be returned (Public) from a Class, you can only do this from a Module, so I've coded the functions in the Module.

Now, how do I go about getting access to those functions from the calling program.

'VB.NET:

Imports DllApplication
Dim oDll as new clsDllClass(value1, value2)

This where I get stuck. I can access anything as normal using the "oDll.Sub/Function/Property/Public" but the Public stuff in the Module is just not visible.

Does anyone know how I can go about solving this problem as I cannot put anything that returns a UDT to a Structure variable in the Class.

Help!

[LaVolpe]

VB6 does NOT allow User Defined Types to be returned (Public) from a Class, you can only do this from a Module, so I've coded the functions in the Module.

Not necessarily true. A VB6 DLL/OCX can return UDTs, but the UDTs must be declared public in a global class.

1) Create a new class in vb6 dll/ocs project and change it's "Instancing" property to GlobalMultiUse
2) Add UDTs to that class and declare them public
3) Any project referencing those (VB6 at least) can now create those UDTs and pass them around

I use this method for OCXs when I want the user to be able to pass/receive my custom UDTs

[JA12]

I've done as you suggested, but I'm still getting the error:

Only public user defined types defined in public object modules can be used as parameters or return types for public procedures of class modules or as fields of public user defined types.

I get this error every time I try to put ANYTHING that allows public access to the UDTs, functions, subs(byref) properties etc.

If I try to return the UDT as a ByRef variant then I get the error:

Only user-defined types defined in public object modules can be coerced to or from a variant or passed to late-bound functions.

All the UDTs are defined in a module as Public. The Class instances is 6.

How did you get around this problem? How can I make a "module" a "public object module"

[Arnoutdv]

The UDTs should be declared in the DLL main class.

[JA12]

OK, thanks for the help. All the errors I was getting suggested otherwise!

I've got it (sort of) working now, at least it's compiling...