Summary

Important Observations

• Functions are called locally using the CALL command. The CALL can pass a working list into the called function.

• The called function must have a RCV_LIST() defined on its FUNCTION statement.

• Passed working lists must be identically defined, in caller and called function.

• The EXCHANGE command enables an "exchange list" of fields to be passed into the called function.

• A called function uses EXCHANGE to return fields to the caller.

• Remote functions running on the server are called using CALL_SERVER_FUNCTION.

• The CALL_SERVER_FUNCTION can handle passing and returning working lists and the fields exchange list.

Tips & Techniques

• In a real application, the client/server connection would normally be established by a "connect" form at the start of the application.

• In this example we depended on the Visual LANSA IDE to start the connect to server.

What You Should Know

• How to CALL a function.

• How to use the EXCHANGE command to pass field values into a called function.

• How to use CALL_SERVER_FUNCTION.