optional argument from vb

[wjturner]

I seem to remember that arguments in a call from vb6 must be by value. And I see in the Fortran manual that optional arguments must be by Ref. Does this mean that I can not have an optional argument in a call from vb6? Or if I can, how do I do it?

[ZlamalJakub]

If the optional argument is not used You must pass zero as an address of variable.

If You pass all arguments by value simply set optional argument to value 0 (integer*4 on win32 or integer*8 on x64).FORTRAN routine will expect that address of the optional argument is 0 and it is not used).

I hope it will work.