Kbase P100755: Error 4009 when using SELF system handle
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
04/10/2005 |
|
Status: Unverified
FACT(s) (Environment):
OpenEdge 10.x
SYMPTOM(s):
Querying an attribute for the SELF system handle result in an error
Cannot query an attribute for the SELF system handle
Invalid UIC passed to ioGetAttribute. (4009)
CAUSE:
The attribute for this handle is not valid or the widget pointed by SELF has been destroyed: SELF is a valid handle as long as the pointed widget is valid, however from the moment you destroy this widget, the SELF system handle is meaningless.
FIX:
Before querying an attribute for an handle, verify that the handle is valid and that attribute and after that you are querying a valid attribute for that handle:
IF VALID-HANDLE (SELF:HANDLE) THEN
IF CAN-QUERY (SELF:HANDLE, 'LABEL') THEN ...