i am using CreateFile in a VB6 app but it doesn't work in VB .NET COM dll.
hGpiFile = CreateFile("\\.\BLIO1", GENERIC_READ Or GENERIC_WRITE, 0,
gblSecurity, OPEN_EXISTING, 0, 0)

I get an error message:
A call to PInvoke function 'BlastronicsGpi!BlastronicsGpi.cGpi::CreateFile'
has unbalanced the stack. This is likely because the managed PInvoke
signature does not match the unmanaged target signature. Check that the
calling convention and parameters of the PInvoke signature match the target
unmanaged signature.

Same code works great in VB6?

-Lou