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

• Microsoft Access versions 1.0, 1.1, 2.0

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.

REFERENCES

For more information about calling DLLs, search on "declare external procedures" using the Microsoft Access Help menu.