SetServiceState Method 93

Applies To: Root

Description

This method is used to set the state of a Dyalog APL service running under Windows. See APL Application as a Service.

The argument to the SetServiceState method is the desired state of the service. This should be one of the following numeric values:

SERVICE_STOPPED	1
SERVICE_RUNNING	4
SERVICE_PAUSED	7

The state of a Windows service is determined by the user and the Windows Service Control Manager (SCM).

When the SCM requests a change of state, the APL interpreter responds by setting its state to the corresponding pending level (SERVICE_STOPPED_PENDING, SERVICE_RUNNING_PENDING or SERVICE_PAUSED_PENDING) and then generates a ServiceNotification event.

It is the responsibility of the APL service to process this event, perform the appropriate application tasks, and then respond (to the SCM) by calling the SetServiceState method to confirm that the service has reached the desired state.