OpenEuphoria

Re: STDout - dos

• Posted by gertie at visionsix.com Jan 17, 2003
• 330 views

On 16 Jan 2003, at 21:53, jbrown1050 at hotpop.com wrote:

> 
> On Fri, Jan 17, 2003 at 12:51:36PM +1100, Patrick.Barnes at transgrid.com.au
> wrote:
> > > In a command-line interface (DOS, not linux) adding "> filename" > to the
> end of your command redirects the output to a file instead. > > Is there any
> other places you can redirect it? Ideally, I'd like > a system() command that
> returns a string to the euphoria program.
> 
> The redirection thing applies to Linux as well btw, jtlyk.
> 
> There is like popen() for linux to do that sort of redirection you want,
> for DOS it can be emulated.
> 
> I've included at the very bottom of this message some sample code, which works
> on ANY platform, that acts like system(), but returns the output.
> 
> It merely redirects the output to a temp file, then reads the output from
> the file into a string, and then deletes the temp file, however.
> 
> (To the best of my knowledge thats the only way to do it for DOS. Even the
> shell
> uses temporary files to simulate command line pipes iirc.)

There's any number of ways to store data in dos memory. You can fake a 
device driver entry to use it's space for a *short* bit of data. You can req an 
ems driver to page you increments of xms into the 640K-1meg space, which 
you can restore or delete or leave there or whatever. You can stuff the keybd 
buffer with a few bites and just gets() or read() it in when returning to the 
main program. I am sure Jiri could come up with a few dozen more methods. 
DRdos uses msg passing like windoze does, so they have a nice method 
too. If you know you will be using dos files to store data of any size, consider
using a ramdrive in xms.

Kat