Path: news.cs.au.dk!Morten.Grouleff.Mjolner.Informatics
From: Morten Grouleff <mg@mjolner.dk>
Newsgroups: comp.lang.beta
Subject: Re: problems with processes
Date: 01 Mar 1999 12:59:16 +0100
Organization: Mjolner Informatics.
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Arne Hüggenberg <zalaster@nef.wh.uni-dortmund.de> writes:

> Hello everyone,
> i have a problem im hoping someone here can me help with
> Using the PE for Linux im trying to do something like this:
> lprtest.bet:
> 
> ORIGIN '~beta/basiclib/current/systemenv';
> INCLUDE 'lpr';
> 
> -- program:descriptor --
> systemenv
> (#
> TextToPrint: ^TEXT;
> do
> &text[]->TextToPrint[];
> 'this is a test'->TextToPrint.putline;
> 'wonder if this works'->TextToPrint.putline;
> TextToPrint[]->&lpr_process;
> #)
> 
> 
> with lpr.bet being:
> 
> ORIGIN '~beta/basiclib/current/systemenv';
> INCLUDE '~beta/process/current/processmanager';
> -- Systemlib: Attributes --
> lpr_process: Systemenv
>   (#
>      PrintMe: ^TEXT;
>      exec:
>        (# name: ^text; child: @process; 
>         enter name[]       
>         do
>           name[]->child.init;
>           printme[]->child.RedirectFromChannel;
>           child.start;
>           child.awaitStopped;
>          #);
>      
>   enter PrintMe[]
>   do 'starting lpr_process'->putline;
>  ('/usr/bin/lpr')->exec; 
>   #);


You can only have one SystemEnvironment in your entire program.  Only
the program:descriptor should be prefixed with systemEnv.

lpr.bet should have ORIGIN in basicsystemenv or indirectly through
ORIGIN in processmanager. Only the program:descriptor should have origin
in systemenv.

The channels you can redirect from include files and sockets, not
texts.  Using redirection is not portable to windows or macintosh.

Place the text you want to print in a file, then execute lpr with that
file as an argument instead.

Regards,
-- 
**  Morten Grouleff:     <URL: http://www.grouleff.dk/>          **
**  Earthworm Jim PC:    <URL: http://www.grouleff.dk/ewj.html>  **
**  Mjølner Informatics: <URL: http://www.mjolner.com>           **