#1426 pipes not working with qt terminal on Windows

[Anonymous]

Hi,

just updated to 5.0 rc1, it seems that on Windows (8.1) the pipes are not working.
I.e. I use a text file inp.txt:
set terminal png
set output 'c:/temp/out.png'
plot sin(x)
exit

While
C:\temp>"c:\Program Files (x86)\gnuplot465\bin\gnuplot.exe" < inp.txt
works fine, the same on gnuplot 5.0
C:\temp>"c:\Program Files (x86)\gnuplot50rc1\bin\gnuplot.exe" < inp.txt
hangs until infinity, i.e. I have to kill gnuplot.exe via the task manager to return to the shell.

Best regards,
Florian

[Tatsuro MATSUOKA]

Perhaps this is related qt terminal.

Please try
set GNUTERM=windows
or
set GNUTERM=wxt
and then test
"c:\Program Files (x86)\gnuplot465\bin\gnuplot.exe" < inp.txt

Tatsuro

[Tatsuro MATSUOKA]

Oops
Not
"c:\Program Files (x86)\gnuplot465\bin\gnuplot.exe" < inp.txt
but
"c:\Program Files (x86)\gnuplot50rc1\bin\gnuplot.exe" < inp.txt

[Tatsuro MATSUOKA]

I have tested using following command.

cd "E:\usr\Tatsu\program\Gnuplot\test21"
E:
set GNUTERM=wxt
"C:\Programs\gp50rc1-64\bin\gnuplot" < gppipetest.txt
set GNUTERM=windows
"C:\Programs\gp50rc1-64\bin\gnuplot" < gppipetest.txt
set GNUTERM=qt
"C:\Programs\gp50rc1-64\bin\gnuplot" < gppipetest.txt

The file gppipetest.txt contains :

gppipetest.txt pipe test command

plot sin(x)
pause 2

For wxt and windows terminals, pipe works as expected.
However, for qt terminal,

E:\usr\Tatsu\program\Gnuplot\test21>"C:\Programs\gp50rc1-64\bin\gnuplot" < gppip
etest.txt

gnuplot> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
^
line 0: invalid command

gnuplot hangs.

I have also tested Kakuto's binary (http://ctan.ijs.si/mirror/w32tex/w32/)
For wxt and windows terminals, pipe also work as expected
For qt terminal, gnuplot hangs without output.

I have done the similar test on Ubuntu 12.04 LTS 64 bit with gnuplot 5.0-rc1 with qt terminal. Pipe works as expected with qt terminal.

This seems to be a bug of qt terminal on windows.

Tatsuro

[Tatsuro MATSUOKA]

Akira Kakuto　suggested that codes for windows of int qt_waitforinput(int options) in qt_term.cpp should be revised for pipe to be accepted.

[Bastian Märkisch]

The report actually was for the png or pngcairo terminal. So that is a separate issue.

For the qt terminal, reading from stdin was actually supposed to work and the code to read is in place. I'll see if I can find out what is going wrong.

[Tatsuro MATSUOKA]

The report actually was for the png or pngcairo terminal. So that is a separate issue.

If I set GNUTERM to wxt or windows, 'gnuplot < inp.txt' works without problem.
Even if I change 'set terminal png' to 'set terminal pngcairo' and I set GNUTERM to wxt or windows, 'gnuplot < inp.txt' works without problem.

I think that the png and pngcairo itself does not have problem.
The problem occurs when initial terminal is qt.

inp.txt sightly modified from original

set terminal png
set output 'out.png'
plot sin(x)
exit

[Bastian Märkisch]

Thanks for the report. Now fixed in CVS.

[Tatsuro MATSUOKA]

I have confirmed the fix. Thanks a lot!