Trying to invoke DLL function

Hello,

I've been struggling with this problem all day and was hoping someone on
this list could help me.  Due to my naivety in VB and how jawin works, I
imagine I've just overlooked something small and stupid, but i need help
so here goes -

I've written a VERY simple DLL in VB:

Public Function sum(i As Integer, j As Integer) As Integer
    sum = i + j
End Function

I compiled the DLL and placed it in my system32 folder, and registered it
with regsvr32.  I then tried to use the simple calling a DLL Entry point
invocation method as specified in the jawin introduction.  That code
looked somethign like this:

FuncPtr sum = new FuncPtr("Sum.DLL", "sum");
System.out.println(sum.invoke(3,4, ReturnFlags.FAIL_ON_FALSE));

(I'm not sure yet how to get the return value of the invocation... i tried
just printing it out, but either way my code fails before then).

The result of that code was:

Loading jawin from hardcoded path c:/jawin-1.0.19/bin/debug/jawind.dll
org.jawin.COMException: 8007007f: The specified procedure could not be
found.

        at org.jawin.Bootstrap.loadFunction(Native Method)
        at org.jawin.FuncPtr.<init>(FuncPtr.java:29)
        at dllTestMain.main(dllTestMain.java:28)


I'm not sure quite what that meant, so I tried to then use the
TypeBrowser.  That produced me a class _Sum that imitated the Calling a
COM component w/stubs method of invocation.  So I tried the following code:

Ole32.CoInitialize();
_Sum sum = new _Sum("");
short i[] = {3};
short j[] = {4};
System.out.println("Sum: " + sum.sum(i, j));
Ole32.CoUninitialize();

And got this result:

Loading jawin from hardcoded path c:/jawin-1.0.19/bin/debug/jawind.dll
org.jawin.COMException: 8000ffff: NULL GIT peer
        at org.jawin.marshal.GenericStub.dispatchInvoke0(Native Method)
        at org.jawin.marshal.GenericStub.dispatchInvoke
(GenericStub.java:84)
        at org.jawin.DispatchPtr.invokeN(DispatchPtr.java:473)
        at org.jawin.DispatchPtr.invokeN(DispatchPtr.java:433)
        at _Sum.sum(_Sum.java:258)
        at dllTestMain.main(dllTestMain.java:36)

Lastly I tried passing in the sting "new:Sum" to the _Sum constructor, but
that gave me a COMException stating: "800401f3: invalid class string".

I'm stuck.  Can anyone offer some advice?