make a process flush it's STDOUT

[LoWang]

Hello, I am trying to get stdout of a process launched by run() function, but stdoutread in a loop does not seem to be getting anything UNTIL I quit that process! Then it gets all the output. How do I make it flush or whatever so it is readable? If I run the process normally I can see it's output in a command line, but don't know how to catch it in realtime...

$pid=run("C:\myproc.exe",@SystemDir, @SW_HIDE, $STDERR_MERGED + $STDOUT_CHILD)

ConsoleWrite("pid:"&$pid&@CRLF)
While @error <> -1
 $sline = StdoutRead($pid)
 If @error Then ExitLoop
 if $sline = "" Then ContinueLoop
 consolewrite($sline&@CRLF)
 Sleep(100)
Wend
StdioClose($pid)

[LoWang]

hmm so it seems it somehow works but only after certain interval. It looks like a few minutes before it gets flushed and stdoutread gets the data... so maybe this will be enough for me...

Edited March 7, 2012 by LoWang

[LoWang]

hm but it seems I cannot rely on it and in some cases it is not few minutes but much longer (or never?...). So anybody have and idea please?

[LxP]

I'm reviving this old topic because it's the top Google result for "AutoIt flush STDOUT," and no other similar threads seem to give a solution.

I'm experiencing the same problem: the only way I can detect a specific action is to match certain STDOUT output by a console executable, but StdoutRead() doesn't see any output until after the process terminates.

My belief is that the executable is flushing STDOUT per line when run "interactively," but not flushing at all when AutoIt is connecting to the process (presumably in a manner that the console executable sees as "non-interactive").

A possible solution to this problem might be to invoke the executable in a way that makes it believe it's being run interactively.  Is anyone aware of a way to do this with AutoIt?  Is this sort of thing even possible under Windows?

I know nothing about the internal workings of AutoIt (or Windows IPC), but is it possible that the implementation of StdoutRead() can be changed to manually flush STDOUT before it's read?