Call by Expression

You can use the program's expression to invoke subroutines, which need to be used throughout the system. Expressions let dynamic calls select programs at runtime.

The only difference between the Call Program and the Call Expression operation is the way you tell Magic xpa which program to call.

• Program ID – Lets you select a defined program from the Program List.

• Program expression – Lets you select a defined expression from the Expression Editor that calls the program.

Usage

You can use the Call by Expression operation to:

• Invoke subroutines.

• Implement one-to-many relationships.

• Implement pick list windows.

• Implement any type of pop-up windows.

• Call a program from within a host application. This is done by supporting the convention of x.yy as the called program number, where yy is the generation of the host application and x is the program number in the host application. Note that the host application number must be a two digit value. Since version: 3.1

Exceptions: This operation is not supported for Offline tasks. You cannot call Offline programs from this operation.

Properties

The properties of the Call by Expression operation are:

Program or Task ID

Arguments

Result

Form

Lock

Sync Data

Returned Context ID

Condition (Cnd)

Related Topics

Call Operations

Call Properties

How Do I Call a Program Dynamically By Its Index?