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Chapter 53

Describes how to call C or C++ foreign functions from within G2.

Overview

Foreign Functions Examples

Creating a Sample Foreign Image

Calling the Sample Foreign Functions

Using Foreign Functions

Creating a Foreign Function Template File

C and C++ Data Types and Character Conversion

Using the Overlay Utility through the Makefile

Completing the Makefile Global Variables

Running the Makefile

Using the Overlay Utility on OpenVMS

OpenVMS and VAX/VMS Options File

Starting and Connecting to the Foreign Image

Starting the Foreign Image as an External Process

Connecting to an External Process Foreign Image

Starting a Foreign Image From Within G2

Connecting to a Foreign Image with a G2-Init File

Declaring a Foreign Function in a KB

Providing the Name of the C Function

Setting the Timeout Interval

Handling Possible Name Collisions

Using a Foreign Function

Disconnecting from the External Foreign Function

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