[Gnuplot-info] Controlling gnuplot with C Sharp via pipe: freeze

[Frank S. <der...@gm...>]

Hello, everybody!

I am writing a C# program, that uses gnuplot via piping. See a minimal
example in the attachment. (You probably have to fit the gnuplot path to
your installation or use an environment variable just like me.)

This console program calls gnuplot und plots the function x+y. But after
that, gnuplot is not closed correctly. If you close the wxt window, the
command
gpProc.WaitForExit();
still blocks, although
bind Close "exit gnuplot"
is set in gnuplot.

But in fact, I don’t care about this. The critical point is: If you hit
a key (e. g. try to close the window with q or Alt + F4), gnuplot seems
to hang.

I am using:
– Windows XP 32bit
– gnuplot 4.6.0 (latest released version; same problem with 4.4.4)
– Windows Visual C# 2010 (other compilers are not an option and I didn’t
try others yet)
– .Net-Framework 4.0 (same problem with 3.5 and probably others)

This problem does not occur under linux. I am not sure, whether it is
caused by windows or by gnuplot. In any case gnuplot can be closed
correctly by uncommenting
gpcommands.WriteLine("exit");


Hope you can help or give an advice.
Thanks!


Greetings
Frank