Re: stderr/stdout/stdin [was lua system interaction on win]

[Martin Spernau <martin@...>]

David Burgess wrote:
> See the earlier mail from read.beyond.data
>
> a) use createpipe(), createprocess() is the only way I
> know to get stderr. However CreatePipe() and ReadFile()
> is a shaky piece of work on win 9x systems. There are
> examples of doing this in MSDN.

Okay so this would be a job for a lib

> b) afaik you cant. You can read from stdin OR write to 
> stdout.

Ok. I can live with that for now. makes the communication more limited, 
but that's still better than temp-files

> c) writeto("|more");write("xxx");writeto();
> demos the output event

Thanks again,
Martin

> > Okay, this has gottem me really far along my way.
> > Now I have some further questions concerning 'piping'
> >
> > The sample code 'opens' the STDOUT of the external process as _INPUT
> > a) how would I (also) connect STDERR as a filehandle to read from?
> > b) how do I write to the STDIN of the above external process?
> > h=readfrom("|command -arg")
> > writeto(h) -- does this connect to STDIN of above pipe?
> >
> > What I'm basically after is controlling another commandline tool 
> > (ispell, curl etc) from within a lua-script. It would also be important 
> > to catch STDERR, of course.
> >
> > Thanks for all the help already,
> >
> > -Martin