## Activities: Virtual programming lab

mod_vpl
Maintained by Juan Carlos Rodríguez-del-Pino
VPL is an activity module to manage programming assignments
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30 fans

VPL- Virtual Programming Lab is a activity module that manage programming assignments and whose salient features are:

• Enable to edit the programs source code in the browser
• Students can run interactively programs in the browser
• You can run tests to review the programs.
• Allows searching for similarity between files.
• Allows setting editing restrictions and avoiding external text pasting.

### Awards

• Wed, 4 May 2016, 11:40 PM
Hello Denis,
The script that launch swi-prolog try in a first fase to check sintacticaly the code, but the input/output was not considered, the test was stalled trying to read an input.
To resolve this try using the following code as your vpl_run.sh as a workaround before I resolve the issue in the next release.

Best regards.
vpl_run.sh
-------------------------
#!/bin/bash
. common_script.sh
check_program swipl
swipl -q -s $VPL_SUBFILE0 -t halt 1>/dev/null < /dev/null cat common_script.sh > vpl_execution echo "swipl -q -L32M -s$VPL_SUBFILE0" >>vpl_execution
chmod +x vpl_execution
• Sun, 8 May 2016, 9:07 PM
Thank you, it works.

Best for you.
• Thu, 30 Jun 2016, 6:33 PM
Hi
I would like to know whether editor window can be enlarged.
Also want to know the gcc version number.
Also in Octave compiler its not supporting imread function. can you clarify
regards
John Blesswin
• Sat, 2 Jul 2016, 4:19 PM
Hi John,
the editor has a button "fullscreen" (its correct name might be "fullwindow") that lets you use the full window. It hides elements outside the editor. If you also set your browser in fullscreen mode (F11) you will get the maximum room.
VPL uses the version of gcc that you installed in your jail server.

Please, describe with more details your problem with Octave imread. Beware that the current versión of VPL is incompatible with binary files. As a workaround you can use binary files in base64 format. e.g. if I want to use a file image.jpg, I must convert the file to base64 and save it as image.jpg.b64. During your program execution you will get access to a the file image.jpg. (the system will decode image.jpg.b64 to image.jpg)

Best regards.
• Wed, 2 Nov 2016, 4:01 AM
Hi Juan,

Can I use this plugin, along with the jailserver, to run PHP assignments?

Thank you,
Horatiu
• Thu, 3 Nov 2016, 11:54 PM
Yes, you can use VPL+jail server to run PHP assignments. VPL 3.1.X default script can run PHP5 CLI but not web programs. VPL 3.2 default script will run PHP to run web applications. But VPL is flexible anought to allow assigments of PHP web applications.
You can use and customize the default script of VPL3.2 for PHP and use it as vpl_run.sh

https://github.com/jcrodriguez-dis/moodle-mod_vpl/blob/v3.2/jail/default_scripts/php_run.sh

If you are using php7 remove php5 from line 10.

Best regards,
Juan Carlos.
• Fri, 4 Nov 2016, 12:14 AM
Notice that you must reduce the security level of the firewall in the jail server service configuration to run PHP for a web application.
• Thu, 5 Jan 2017, 12:16 AM
Happy new year!
You could add erlang to the list of languages available for VPL!

I've tried vpl for erlang: https://www.erlang.org/
=> that's ok (on my server and on the demo server): http://demovpl.dis.ulpgc.es/moodle/mod/vpl/view.php?id=399

It's just a small test.
1) I've changed the vpl_run.sh (for prolog) into:
. common_script.sh
check_program escript
cat common_script.sh > vpl_execution
echo "escript $VPL_SUBFILE0" >>vpl_execution chmod +x vpl_execution And 2) test with an erlang program: -module(plusOne). -compile(export_all). plusOne(N)-> N+1. main([]) -> io:format('Give a number (end your line with .)~n',[]), {ok,X} = io:read(':>'), Y=plusOne(X), io:format('~p + 1 => ~p ~n',[X,Y]). That's all. And it works. But I'm not a specialist with Erlang, and not a specialist with VPL. Maybe, there are better ways to do that. Good surprise: the code editor colorized nicely erlang code (without anything to be done). Best for you, Denis B. • Thu, 5 Jan 2017, 12:59 PM hi , when I submitted the c++ program to be compiled or evaluated. It shows the error message "g++: error: unrecognized command line option ‘-fno-diagnostics-color’" how can I fix it? Best for you, James TT • Sat, 7 Jan 2017, 3:20 AM Hello Denis Bouhineau, thank for your contribution. The next mayor release of VPL 3.3 will include a default script for Erlang. Best regards. • Sat, 7 Jan 2017, 3:44 AM Hello tt tt, sorry for the inconvenience. You have two options: 1) Edit run_c.sh run_cpp.sh at mod/vpl/jail/default_scripts/ and remove that args. Also you can replace the C and C++ related scripts with the ones in the VPL 3.1.5 2) Upgrade your C++ compiler. I will try to solve the problem in future releases. Best regards, Juan Carlos. • Sat, 4 Feb 2017, 1:51 PM Hi Juan Carlos Rodríguez-del-Pino, I am using the vpl module of moodle and i need to customize some of its functionalities. I need to run sample testcases directly on RUN button and dont want command prompt to open and enter the input by user or student. so any suggestions and idea u can give on this? • Thu, 16 Feb 2017, 9:15 AM Hello , some one already use vpl to java code with package and two classes in the same package? because, i test this example and i have error. Thank for your help • Thu, 16 Feb 2017, 8:05 PM Sorry Kushal Patel for the late answer. If you want to avoid that the user interact when the students RUN their code you must modify the default script of the language you are using and redirect the standar input to /dev/null. e.g. if you are using java you must get the java default script and copy it to your vpl_run.sh , then replace the line echo "java -enableassertions$MAINCLASS" >> vpl_execution
by
echo "{" >> vpl_execution
echo "java -enableassertions \$MAINCLASS" >> vpl_execution
echo "} < /dev/null" >> vpl_execution

I recomend to use the "based on" feature.

Best regards.

• Thu, 16 Feb 2017, 8:11 PM
Hello Moussa Sarr,
you can use java classes and packages in VPL. To resolve the problem you need to give full detail of your code and how you use it in VPL.

Best regards.