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

["David Burgess" <david@...>]

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.

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

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



> 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