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Passing Variant/Long to COM Object
Message
From
01/12/2008 18:15:40
Joel Leach
Memorial Business Systems, Inc.
Tennessee, United States
 
 
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General information
Forum:
Visual FoxPro
Category:
COM/DCOM and OLE Automation
Title:
Passing Variant/Long to COM Object
Environment versions
Visual FoxPro:
VFP 9 SP2
OS:
Vista
Application:
Desktop
Miscellaneous
Thread ID:
01364969
Message ID:
01364969
Views:
64
I'm working with a COM interface that accepts a couple of parameters passed by reference. The component expects the parameters to be of types Variant and Long. Is there any way to tell VFP to explicitly create variables of those types? I realize that VFP variables are inherently variant, but Fox does assign a type to them. A variable that is declared but not assigned is by default a logical variable. I don't know how to create a variant type in VFP. Perhaps type Integer or Numeric will work for the Long variable, but I won't know unless I can get past the "Type Mismatch" error for the variant.

The component designers obviously had VB in mind when creating the interface. As a test, I created a VB6 wrapper to the function, and it works as long as I declare the variables as Variant and Long. If I change them to any other type (String, Integer, etc.), it doesn't work. I'd like to do away with the VB wrapper if possible.
Joel Leach
Microsoft Certified Professional
Blog: http://www.joelleach.net
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