Your local variable must be initialized to a numeric value before passing it to the COM method:

LOCAL MyVar
MyObj = CREATEOBJECT ("MyCOM.SomeClass")
MyObj.SomeMethod (@MyVar)   && SomeMethod assign 1 to MyVar
? MyVar && Print out .T.

LOCAL MyVar
MyVar = 0
MyObj = CREATEOBJECT ("MyCOM.SomeClass")
MyObj.SomeMethod (@MyVar)   && SomeMethod assign 1 to MyVar
? MyVar && Print out 1

HTH

>That's what I thought.
>
>Only I'm sending a local variable using @ to a COM I created in VFP, and it returns as value .T., when it should be a numeric.
>
>When I test this using the class library directly from Fox, it works, but when I access the DLL, it fails.