ACC: How to Declare C++ Functions Called from Access Basic

SUMMARY

Advanced: Requires expert coding, interoperability, and multiuser skills.

The following steps describe how to call C++ dynamic-link library (DLL) functions in Access Basic:

1. Make sure to define the functions within your C++ code with the "extern" declaration. The following example demonstrates the syntax for the extern declaration:
   

   extern "C" {return type} FAR PASCAL __export {function name} ({parameters})

   An example of an actual declaration in your C++ code might look like:
   

   extern "C" int FAR PASCAL __export my_func ()

   To call the sample function above you would define the Declare statement as follows:
   

         Declare Function my_func Lib "MYLIB.DLL" () As Integer
   						

2. Make sure that the declaration is not set for case-sensitive exports.