Kbase P124115: " " <space> string is seen as "" <zero-length> string when performing a conditional/logical test
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
10/02/2010 |
|
Status: Verified
SYMPTOM(s):
A variable named foo is defined as CHARACTER
The single <space> value is assign to foo
When performing a conditional test, foo bahaves as if it contains an empty string
foo=" " is equivalent to foo=""
FACT(s) (Environment):
Windows
UNIX
CAUSE:
This is an expected behaviour.
CAUSE:
The ABL/4GL code considers a string that exclusively contains <space> values as an empty string.
FIX:
To check whether a string exclusively contains 1 or more <space> values you can use the following:
DEFINE VARIABLE foo AS CHARACTER NO-UNDO.
foo= " " .
IF foo = " " AND length(foo) > 0 THEN
MESSAGE "There is" length(foo) "space(s)"
VIEW-AS ALERT-BOX INFO BUTTONS OK.
ELSE
MESSAGE " No space in it"
VIEW-AS ALERT-BOX INFO BUTTONS OK.