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Exporting functions from C DLL

Inter-Process Communication

Exporting functions from C DLL

by  chiph  Posted    (Edited  )
If you're writing a C DLL that you expect to be able to call from VB, you may be tempted to use the __declspec(dllexport) keyword. While this works fine for having other C functions call your DLL, VB is unable to find the exported functions. Instead, you should export your functions using a .DEF file.

The structure is pretty easy. You tell it you're writing a DLL, give it a name and description, and list the exported functions, with optionally a numeric ordinal.

[tt]
LIBRARY WhizzoDLL
DESCRIPTION "Implements a Whizzo operation."
EXPORTS
Insert @1
Delete @2
Search @3
Whizzo @4
[tt]

Add the .DEF file to your Visual C++ project and re-link. All should be fine.

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