Re: Create a directory from RPG

["Beppe Costagliola" <beppecosta@xxxxxxxx>]

Scott,

At present I call a CL with an ovrdbf of stdout to a qtemp file and then
QSH.

The QCMDEXC could achieve more or less the same result; it's a setup step
and I'm not concerned with high performances.

However I was curious on how to use QzshSystem (just to let easy things to
become more difficult and obscure).  I saw some old postings but it was not
so clear.

Thanks for your explanation.

Giuseppe.

----- Original Message ----- 
From: "Scott Klement" <rpg400-l@xxxxxxxxxxxxxxxx>
To: "RPG programming on the AS400 / iSeries" <rpg400-l@xxxxxxxxxxxx>
Sent: Tuesday, February 22, 2005 6:24 PM
Subject: Re: Create a directory from RPG


>
> > Within CL it works fine using:
> > QSH CMD('mkdir -p /one/two/three/four')
>
> So why not do it that way in RPG as well?  (via QCMDEXC, system(), etc)
> You'll get rotten performance, but that's no different from CL.
>
>
> > I've tried QzshSystem from Rpg but I always get error 7. I've checked
> > old postings but I did not understand the right way to code.
>
> The way that QShell works is that it spawns a separate job for each
> command that you run. That job is connected to the original job via 3
> pipes.  One for standard input, one for standard output and one for
> standard error. (That's why QShell commands seem so slow -- for each one
> it has to create a new job and connect the pipes!)
>
> The QzshSystem() API does NOT create the background job or the pipes for
> you. You have to do that yourself -- making this API almost completely
> useless! (In my opinion.)
>
> You can use the spawn() or spawnp() APIs to run a QShell command. If you
> use the pipe() API to create the pipes, you can have a functioning QShell
> command this way.
>
> A much better (more efficient) way to create these directories is to use
> the mkdir() API instead of trying to call QShell.  mkdir() doesn't have
> the option to automatically create the parent directories, but that's not
> very difficult to do with a simple %scan() loop in RPG.
>
> Just wrap the routine up in a subprocedure and stick it into a service
> program, then you'll always have it!
> -- 
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