#594 read stdout

[Igor]

in vbs (visual basic script) i can do

Set DDE_EXE=WshShell.Exec(WHERE_WE & "\dde.exe " & WScript.Arguments(1))
Do While Not DDE_EXE.StdOut.AtEndOfStream
L = DDE_EXE.StdOut.ReadLine
Loop

when i run DDE.exe, i dont wait when dde.exe finish and closes STDOUT,
i begin read stdout of dde.exe immediately!
i try rexx, i can read stdout but when dde.exe finished.
dde.exe- process of reciveing stock price in real time mode.
Can i ask developers to realize this future?
Thanks.

[Erich]

Igor, sorry for not answering earlier.
We'd need an example to reproduce the issue.
Are you aware that in Rexx you can open files for shared reading with e.g.

s = stream(.stdin, "C", "OPEN READ SHARED")

[Igor]

Thanks Erich. How i can read STDOUT of child process (for examlpe DDE.EXE or NETSH.exe or MY.EXE) and dont wait while child process finish?

when i use RXQUEUE Filter

/*rexx*/
'dde.exe|RXQUEUE'
do forever
     parse pull MYLINE
end

i can read QUEUE only when dde.exe finished & closed own STDOUT. But dde.exe run 7*24 & never stop.

Thanks

[Erich]

'dde.exe|RXQUEUE'
do forever ..

Igor, with this the "do forever" loop will only start after the command has
finished.

You might want to run the command with 'START dde ..' and use a named
queue. Something like:

queueName = .RexxQueue~create          -- a unique queue name, not a
.RexxQueue object
queue = .RexxQueue~new(queueName)      -- create the queue we'll use to
capture command output

'start cmd /c "dir /s \ | rxqueue"' queueName

do forever
  say queue~linein
end

As an alternative without rxqueue might write just the filter in ooRexx
(which just reads stdin) and run it via 'DDE | RexxFilter.rex'

Erich

On Mon, Oct 19, 2015 at 3:47 PM, Igor ingvaring@users.sf.net wrote:

Thanks Erich. How i can read STDOUT of child process (for examlpe DDE.EXE
or NETSH.exe or MY.EXE) and dont wait while child process finish?

when i use RXQUEUE Filter
~~~~
/rexx/
'dde.exe|RXQUEUE'
do forever
parse pull MYLINE
end
~~~~
i can read QUEUE only when dde.exe finished & closed own STDOUT. But
dde.exe run 7*24 & never stop.

Thanks

---

[feature-requests:#594] read stdout

Status: unread
Milestone: v4.2.0
Created: Tue Apr 15, 2014 07:05 PM UTC by Igor
Last Updated: Sun Oct 18, 2015 05:06 PM UTC
Owner: nobody

in vbs (visual basic script) i can do

Set DDE_EXE=WshShell.Exec(WHERE_WE & "\dde.exe " & WScript.Arguments(1))
Do While Not DDE_EXE.StdOut.AtEndOfStream
L = DDE_EXE.StdOut.ReadLine
Loop

when i run DDE.exe, i dont wait when dde.exe finish and closes STDOUT,
i begin read stdout of dde.exe immediately!
i try rexx, i can read stdout but when dde.exe finished.
dde.exe- process of reciveing stock price in real time mode.
Can i ask developers to realize this future?
Thanks.

---

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[Igor]

I did so. Its not convinient for me. Because console window of cmd is visible(((

[Erich]

console window of cmd is visible

START has a /MIN parameter to hide the window, and a /B parameter to run in
background

As an alternative to starting a separate command window, use a standard
pipe (DDE | RexxFilter) and just write RexxFilter.rex (reads .stdin and
does any necessary processing). Makes it more portable, too.

Erich