Associates an internal procedure with an ABL callback event.
Return type: LOGICAL
Applies to: Buffer object handle, Procedure object handle, ProDataSet object handle, Query object handle
You can also use the APPLY-CALLBACK( ) method to apply a callback procedure for an object.
For Web services, the AVM invokes the specified internal procedure as part of the SOAP request message formulation.
This method returns FALSE if the callback-name is not valid or if procedure-context is not a valid handle; returns TRUE otherwise. If this method is specified but cannot be invoked, or it fails, no procedure will be executed as part of the callback event.
If this method is called multiple times, the new values passed replace the previously set values.
To remove the callback procedure associated with a Web service procedure, invoke this method with a valid callback-name and an empty string ("") for the internal-procedure. The AVM will not generate an error if an attempt is made to remove a callback procedure and a callback is not associated with the callback.
For more information on events, see the Handle-based Object Events Reference.