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Tip of the Day
Language: Visual Basic
Expertise: Beginner
Oct 1, 1996

Declaring DLL Functions

Question:
A colleague wants to create a DLL using Borland C++ to call from Visual Basic 3.0 but she keeps getting an error message "Sub or Function Not Defined". Do you know of any "in-depth" references to consult on creation of DLL's?

Answer:
The DLL has probably been created ok...you just need to declare the function at the top of the form you're using it in, or in a .BAS module. Take a look at the Programmers' Guide...it has information about using DLL functions. The other possibility is that your friend did not make the Sub or Function in the DLL public.

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