perform/5—perform a specified action and return a value

The perform/5  performs a specified action and returns a  value.

perform($OBJECT,$ACTION,$ARGS,$RETCODE,$RETTEXT)

perform/5 arguments

Argument

Mode

Type

Description

$OBJECT

input

OBJECT

Specifies the object handle for the event or data on which the action is to be performed

$ACTION

input

STRING

Specifies the name of the action to be performed

$ARGS

input

LIST_OF ANY

Specifies a list of action arguments.

Required arguments for the action specified in $ACTION must be of the correct type specified in the action definition and must be included in the $ARGS list.

$RETCODE

output

INTEGER

The numeric return code of the specified action

$RETTEXT

output

STRING

The text string returned by the specified action

Use perform/5 to perform the action specified by the $ACTION argument on the event or data with the object handle specified in the $OBJECT argument and return a numeric return code in $RETCODE and a text string in $RETTEXT. Required arguments for the action must be provided in the $ARGS list.

If the action returns through action_return/2, the return exit code and text value is determined by the return code and text string values defined in the perform/5 arguments. If the action does not return through the action_return/2 primitive or if it is an external action, the values 0 and an empty string will be returned.

perform/5 example

perform($E,AssignTo,[Operator1],$RETCODE,$RETTEXT);

 

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