What is the equivalent of Java's System.out.println() in Progress ABL?

Question

I'm trying to implement Java's System.out.println() method in Progress ABL.

The closest functionality seems to be:

test.p:

MESSAGE "hello world" SKIP.

I ran the following tests to see if it works:

Windows
FAIL    C:\opt\prgs\dlc117\bin\prowin   -b -p test.p
OK      C:\opt\prgs\dlc117\bin\prowin   -b -p test.p | % ToString
OK      C:\opt\prgs\dlc117\bin\_progres -b -p test.p
OK      C:\opt\prgs\dlc117\bin\_progres -b -p test.p | % ToString

Unix
TODO

So in the end, I'd implement it like this:

METHOD STATIC PUBLIC VOID println(i_cText AS CHAR):

    MESSAGE i_cText SKIP.
    PAUSE 0.
    
    CATCH oError AS CLASS Progress.Lang.Error:
        /* Suppress error because MESSAGE doesn't support NO-ERROR. */
    END.
END.

I haven't found a way to know when the MESSAGE will fail. I tried checking OPSYS, TERMINAL and SESSION:BATCH-MODE but they are not reliable. I'd need to know if default output exists but how?

Answer 1

AFIAK you always have to redirect in order to execute in batch. Your commandline without redirecting results in

---------------------------
Error
---------------------------
** Attempt to write with no current output destination. (516)
---------------------------

Once you redirect, code below will write to stdout.

put unformatted "put Hello world".
message "message Hello world".
display "display Hello world".
quit.

you can use | tee on linux or | % ToString in powershell result

prowin.exe -b -p .\helloworld_stdout.p | % ToString
put Hello world
message Hello world

display Hello world