Using $STDOUT_CHILD causing window to not display

[jpassmore]

Ok, I have a simple thing that is driving me crazy. I have to automate a command line based application.

I use a call like:

$pid = Run(@Comspec,"c:\MyAppPath\",@SW_SHOW)

This will launch the command window and all is well except I cannot capture stderr

So... I add that in like so:

$pid = Run(@Comspec,"c:\MyAppPath\",@SW_SHOW,$STDOUT_CHILD)

Now the window flashes up then disappears and I cannot capture the stdout correctly. Why is the window going away when I add the call to $STDOUT_CHILD?

[BrewManNH]

Did you add #include <Constants.au3> to your script? Without it, you're going to get an error because the variable name won't be declared.

[jpassmore]

Yes, I have the #include <Constants.au3> call in it.

[jpassmore]

There are no errors, it just makes the command window flash on then off. take out the call to $STDOUT_CHILD and it works again.

[BrewManNH]

Relooking at the code you posted, you're only running cmd? Is there anything else being run by this? Can you post a reproducer script that shows the problem, because all that will do is open the command console?

[kylomas]

jpassmore,

As BrewmanNH says, you are not executing anything except the command processor. The following is an example of running ipconfig and capturing the output.

#include <constants.au3>

local $out

$rslt = Run(@ComSpec & " /c ipconfig /all ", @SystemDir, @SW_HIDE, $STDERR_MERGED + $STDOUT_CHILD)
While 1
    $out = StdoutRead($rslt)
    If @error then exitloop
    if stringlen($out) > 0 then consolewrite($out & @lf)
WEnd

kylomas