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Night Wulfe, our posts passed in the ether. Thanks. I just figured out the solution you suggested.

Thanks again for the help.

Ok, so this has been a learning experience but I'll share how I've solved the issue in case anyone wanders into this thread. Of course, this is going to be pretty obvious to most people. It's...

Thanks, Night Wulfe.

So, my original claim was incorrect - the DLL *IS* being compiled with /clr. So, given that, any suggestions how I can just pass a string down to it?

I've posted a zip...

Thanks, vcdebugger. After your suggestion I've been off reading about MarshalAs. All new to me.

However, unless I've misunderstood or misplaced something, adding that to the code doesn't help...

Instead of continuing the back and forth, I've created a simple example that demostrates the issue I'm trying to resolve. I've attached it to this thread.

Check out Form1.cs, line 27. Just...

Yes, ok. The /clr flag is set so it apparently does support CLR.

Hmmm.... I guess I'm even more confused than I thought I was. I thought I had answered all those questions. Let me try again.

The C++ is unmanaged, which is what I thought meant it was not CLI. ...

Der... yeah. That would make sense:

Error The best overloaded method match for 'MyClass.MyClassClass.Foo(sbyte*)' has some invalid arguments
Error Argument '1': cannot convert from 'string' to...

I'm confused. What "important bits" am I missing? I thought I had included all that was needed, else I would have included the rest. Can you be more specific?

Thanks.

Don't have one.

Why, you ask? Since I have included the DLL as a reference, I didn't think I needed a C# function definition. I'm calling all kinds of other functions from the DLL with no...

Lost..... :( How do I call an unmanaged C++ DLL class member function from C# code? I can change any and all of these definitions. I just need to get a string from the C# world to the C++ world...