Kbase 18414: 4GL: How To Test If An Output Stream Is Open or Closed
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
04/03/2010 |
|
Status: Verified
GOAL:
How to test if an output stream is open or closed?
GOAL:
Testing if an output stream is open
GOAL:
Testing if an output stream is closed
GOAL:
How to test if an output stream is open?
GOAL:
How to test if an output stream is closed?
FACT(s) (Environment):
Progress 9.x
OpenEdge 10.x
All Supported Operating Systems
FIX:
To determine whether an output stream is closed, use the SEEK function. SEEK() returns ? when the stream is closed.
/* closed.p */
DEFINE STREAM test.
OUTPUT STREAM test TO junk.out.
OUTPUT STREAM test CLOSE.
IF SEEK(test) = ? THEN
MESSAGE "Stream is closed" VIEW-AS ALERT-BOX.