Path: utzoo!attcan!uunet!wuarchive!usc!apple!voder!dtg.nsc.com!waggoner
From: waggoner@dtg.nsc.com (Mark Waggoner)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Tags - How do they work.
Message-ID: <1479@icebox.nsc.com>
Date: 31 Oct 90 17:31:45 GMT
References: <53151.657181050@atronx.UUCP>
Reply-To: waggoner@icebox.UUCP (Mark Waggoner)
Organization: National Semiconductor, Santa Clara
Lines: 40

In article <53151.657181050@atronx.UUCP> rwm@atronx.UUCP (Russell McOrmond) writes:
>Well, it seems that I don't fully understand the concept of Tags. I am 
>trying to make use of the 2.0 System() command, but my knowledge of Tags is
>presenting me with a problem.

I don't know anything about tags and, therefore, my comments below
are no more than educated guesses...  
The program below has been edited down:

>        FILE *outfile,*infile;
>        int rc;
>
>        if (!(outfile = fopen("tempout","w"))) {
            ...
>        if (!(infile = fopen("tempin","r"))) {
            ...
>        rc = System(argv[1],
>              (
>              SYS_Input, infile,
>              SYS_Output, outfile,
>              SYS_Asynch, FALSE,    
>              TAG_DONE
>              )
>            );

It seems to me unlikely that the System call would use FILE arguments
(the infile and outfile parameters) and more likely that it would use 
a pointer or BPTR to a FileHandle returned by the Dos function Open().
A FILE is defined by the library provided by the compiler vendor and
the System() call wouldn't know how to use it.






-- 
Mark Waggoner  Santa Clara, CA    (408) 721-6306         waggoner@dtg.nsc.com 
 Unofficially representing National Semiconductor Local Area Networks Group
                   Officially misrepresenting myself.