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Writing application-level scripts – PB Docs 2021 – PowerBuilder Library

Writing application-level scripts – PB Docs 2021

Writing application-level scripts

When a user runs an application, an Open event is triggered in the
Application object. The script you write for the Open event initiates
the activity in the application. Typically it sets up the environment
and opens the initial window.

When a user ends an application, a Close event is triggered in the
Application object. The script you write for the Close event usually
does all the cleanup required, such as closing a database or writing a
preferences file.

If there are serious errors during execution, a SystemError event
is triggered in the Application object.

Batch applications

If your application performs only batch processing, all
processing takes place in the script for the application Open
event.

The following table lists all events that can occur in the
Application object. The only event that requires a script is
Open.

Event

Occurs when

Open

The user starts the application.

Close

The user closes the application. Typically, you
write a script for this event that shuts everything down (such
as closing the database connection).

SystemError

A serious error occurs at runtime (such as trying
to open a nonexistent window). If there is no script for this
event, PowerBuilder displays a message box with the PowerBuilder
error number and message text. If there is a script,
PowerBuilder executes the script.

For more about
error handling, see Handling errors at
runtime
.

Idle

The Idle PowerScript function has been called and
the specified number of seconds has elapsed with no mouse or
keyboard activity.


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