On Wed, 2013-10-30 at 00:46 +0100, Benoît Minisini wrote: > Le 30/10/2013 00:00, Benoît Minisini a écrit : > > Le 29/10/2013 23:12, Tobias Boege a écrit : > >> On Fri, 25 Oct 2013, Beno?t Minisini wrote: > >>> Le 24/10/2013 15:08, Tobias Boege a ?crit : > >>>> My workaround always was like this: > >>>> > >>>> ' Create the read pipe special file > >>>> hGPstdout = Pipe "/tmp/gnuplotFIFO2" For Write > >>>> Close #hGPstdout > >>>> ' Create write end > >>>> hGPpipe = Pipe "/tmp/gnuplotFIFO1" For Write > >>>> ' Start writer > >>>> hGPproc = Shell "gnuplot </tmp/gnuplotFIFO1 >/tmp/gnuplotFIFO2" > >>>> ' Really create read end > >>>> hGPstdout = Pipe "/tmp/gnuplotFIFO2" For Read Watch > >>>> > >>>> Note that since the shell which starts hGPproc already opened > >>>> /tmp/gnuplotFIFO2, you won't have any deadlock problems when opening > >>>> hGPstdout For Read afterwards. > >>>> > >>>> Anyway, if I > >>>> > >>>> Print #hGPpipe, "plot x^2" > >>>> > >>>> only garbage (not non-sense but the string is always scrambled) seems to > >>>> arrive at gnuplot. Also, I seem to get output from gnuplot irregularly. > >>>> So > >>>> I'm out of options for now. I remember that raising Read events for > >>>> streams > >>>> has been subject to issues from time to time... > >>>> > >>>> Regards, > >>>> Tobi > >>>> > >>> > >>> Please give details. I tried what you said (but "plot x*x" because" > >>> "plot x^2" seems to not be the good syntax), and I always got the plot > >>> as expected. > >>> > >> > >> OK. The attached project gives the following output after I pressed > >> "Button1" four or five times: > >> > >> --- > >> Read line 0: non-integer passed to boolean operator > >> > >> > >> Read > >> gnuplot> lot x^1 > >> ^ > >> line 0: invalid command > >> > >> > >> Read > >> gnuplot> pot x^1 > >> ^ > >> line 0: > >> Read invalid command > >> > >> > >> Read > >> gnuplot> lotx^1 > >> ^ > >> line 0: invalid command > >> > >> > >> Read > >> gnuplot> plp plot x^1 > >> ^ > >> > >> Read line 0: invalid command > >> > >> > >> > >> --- > >> > >> You can see that in each message, one character is missing so that "plot" > >> is > >> "lot" or "pot" or "lot" again. The missing characters "plp" appear in the > >> last message, totally mis-placed. > >> > >> Am I maybe reading incorrectly from the pipe? > >> > >> Regards, > >> Tobi > >> > > > > Spoke too fast. Now I have the same output as you (more or less)... > > > > Try that. You must kill gnuplot explicitely. Otherwise by running the > program several times, you get a lot of gnuplot processes all writing to > the same pipes. So everything is mixed. > > Otherwise, why using file pipes that way? Why not communicate directly > with the input/output of the gnuplot process? >
Woohoo! Now it's working properly. Attached is a bit of gnuplot fun.
pipedoc-0.0.3.tar.gz
Description: application/compressed-tar
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