Release 10.1A: OpenEdge Development:
Progress 4GL Reference

INSTANTIATING-PROCEDURE attribute

Returns the handle to the procedure in which an object was instantiated.

Data type: HANDLE

Access: Readable

Applies to: ACTIVE-WINDOW system handle, Asynchronous request object handle, BROWSE widget (browse and column), Buffer object handle, Buffer-field object handle, BUTTON widget, CALL object handle, COMBO-BOX widget, CONTROL-FRAME widget, CURRENT-WINDOW system handle, Data-relation object handle, Data-source object handle, DEFAULT-WINDOW system handle, DIALOG-BOX widget, EDITOR widget, FIELD-GROUP widget, FILL-IN widget, FRAME widget, IMAGE widget, LITERAL widget, MENU widget, MENU-ITEM widget, ProDataSet object handle, Query object handle, RADIO-SET widget, RECTANGLE widget, SAX-attributes object handle, SAX-reader object handle, SELECTION-LIST widget, SELF system handle, Server object handle, Server socket object handle, SLIDER widget, Socket object handle, SOURCE-PROCEDURE system handle, SUB-MENU widget, TARGET-PROCEDURE system handle, Temp-table object handle, TEXT widget, THIS-PROCEDURE system handle, TOGGLE-BOX widget, Transaction object handle, WEB-CONTEXT system handle, WINDOW widget, X-document object handle, X-noderef object handle

When applied to a widget or object handle, this attribute always returns a handle. This handle is either valid or invalid based on the state of the instantiating procedure. The instantiating procedure for a dynamically created object might no longer be running. In this case, the handle is invalid.

Note: Since you can never be sure of the state of an instantiating procedure, never use this attribute as a chained attribute.

In general, INSTANTIATING-PROCEDURE returns the procedure handle for the procedure in which the DEFINE or CREATE statement is executed. Following are the exceptions:

For a procedure handle or an asynchronous request object handle, INSTANTIATING-PROCEDURE returns the procedure handle for the procedure from which the RUN statement was executed.
For a socket handle created on a socket server after a CONNECT statement, INSTANTIATING-PROCEDURE returns the procedure handle for the procedure in which the socket server connect procedure is defined.
For a temp-table handle that is passed from a client to an Appserver, INSTANTIATING-PROCEDURE returns the procedure handle for the first procedure run on the AppServer.
For a temp-table handle that is received from an AppServer by a client, INSTANTIATING-PROCEDURE returns the procedure handle for the procedure that called the AppServer.
For implicitly created handles, INSTANTIATING-PROCEDURE returns the procedure handle where the implicitly created object is returned (such as the SAX-attributes object in the StartElement callback).
For the COM-SELF system handle, which is not a widget handle, INSTANTIATING-PROCEDURE returns a run-time error.

Although this attribute applies to all widgets and handles, not all system handles are associated with an instantiating procedure and do not return a procedure handle. For these system handles, this attribute returns the Unknown value (?). The following system handles always return the Unknown value (?):

CLIPBOARD system handle	CODEBASE-LOCATOR system handle
COLOR-TABLE system handle	COMPILER system handle
DEBUGGER system handle	ERROR-STATUS system handle
FILE-INFO system handle	FOCUS system handle
FONT-TABLE system handle	LAST-EVENT system handle
RCODE-INFO system handle	SESSION system handle
WEB-CONTEXT system handle