OpenEuphoria

Re: STDout

• Posted by jbrown1050 at hotpop.com Jan 20, 2003
• 367 views

On Mon, Jan 20, 2003 at 10:40:51AM +1100, Patrick.Barnes at transgrid.com.au
wrote:
> 
> Oh, I see...
> 
> The main source of latency though is the time taken to do the pings... one at
> a time.
> 
> I'll just do it with '>', because of the very different formats that a ping
> output can take. I see, a '>>' appends to the file, rather than clearing it.
> 
> When I do a system() call, a dos box appears. When I do 1300 system calls,
> they pop up sequentially of the course of an hour or so. Now this is particularly
> irritating! Anyway to stop them appearing? There is nothing displayed in the
> dosboxes, because any output is redirected to a file.
> 

I don't do windows, so I have no idea.

But other ppl have solved this problem before, so search the mailing
list I suppose.

> -----Original Message-----
> From: 'jbrown1050 at hotpop.com' [mailto:jbrown1050 at hotpop.com]
> Sent: Monday, 20 January 2003 10:01
> To: Barnes Patrick
> Subject: Re: STDout
> 
> 
> On Mon, Jan 20, 2003 at 09:32:58AM +1100, Barnes Patrick wrote:
> > I don't get it.
> > 
> > command line example?
> 
> --start of example
> 
> constant ping_addr = {...} --put your addrs in there, or maybe read from a
> file.
> 
> constant datafile = "12345678.123"
> 
> procedure system_r(sequence s)
> 	system(s&" >> "&datafile, 2)
> end procedure
> 
> --ping them all at once.
> for i = 1 to length(ping_addr) do
> 	system_r("ping "&ping_addr[i])
> end for
> 
> integer h
> h = open(datafile, "r")
> --at this point, the output of all 1300 pings have been saved to file,
> --so you can read it all at once.
> 
> --end of example
> 
> Is that simple enough for you?
> 
> > 
> > -----Original Message-----
> > From: 'jbrown1050 at hotpop.com' [mailto:jbrown1050 at hotpop.com]
> > Sent: Monday, 20 January 2003 09:33
> > To: Barnes Patrick
> > Subject: Re: STDout
> > 
> > 
> > On Mon, Jan 20, 2003 at 08:54:50AM +1100, Barnes Patrick wrote:
> > > >>Use >> instead of >, and read it in once, instead of 1300 times.
> > > 
> > > I don't understand the use of >> as opposed to >. There are 1300 names to
> > > ping, and each time I need to get the text from that ping returned to the
> > > euphoria program.
> > 
> > Using '>>' lets you ping 1300 times, but read it in all at once.
> > 
> > That may not be signifcantly faster however, doing it in windows via pipes
> > (Elliott tells me CreatePipe(), DuplicateHandle(), and CreateProcess() is
> > the way to go, tho I know not the specifics) is the best method.
> > 
> > jbrown
> > 
> > > 
> > > -----Original Message-----
> > > From: jbrown1050 at hotpop.com [mailto:jbrown1050 at hotpop.com]
> > > Sent: Friday, 17 January 2003 15:49
> > > To: EUforum
> > > Subject: Re: STDout
> > > 
> > > 
> > > On Fri, Jan 17, 2003 at 03:12:05PM +1100, Patrick.Barnes at
> > > transgrid.com.au wrote:
> > > > 
> > > > Hmm... I think that would be too slow.
> > > > 
> > > > I have to ping 1300 names, and for each record what the IP address
> > > > resolves too, and whether the ping a) succeeds b)times out or c) does not resolve
> > > > the IP address
> > > > 
> > > > Any alternative to piping the ping output into a file, and reading it
> > > > 1300 times?
> > > > 
> > > 
> > > Use >> instead of >, and read it in once, instead of 1300 times.
> > > 
> > > However, using real pipes would be better. (I know how to do this for
> > > Linux,
> > > but not windows, sry.)
> > > 
> > > jbrown
> > > 
> > > > 
> > > > -----Original Message-----
> > > > From: jbrown1050 at hotpop.com [mailto:jbrown1050 at hotpop.com]
> > > > Sent: Friday, 17 January 2003 13:53
> > > > To: EUforum
> > > > Subject: Re: STDout
> > > > 
> > > > 
> > > > 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.
> > > > 
<snip>

> 
> 
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