The command started in the QProcess does not return a response on linux

Question

I'm tryin get loaction of node package. Using QProcess to execute commang which node:

QProcess process;
process.start("/usr/bin/which", QStringList() << tr("node"));
process.waitForFinished(-1);
response = process.readAllStandardOutput();
qDebug() << response;

But in debug I got "".

Project located on GitHub. Problem in https://github.com/Dissfall/nodeGator/blob/develop/mainwindow.cpp

Try reading [`stderr`](http://doc.qt.io/qt-5/qprocess.html#readAllStandardError) as well -- in case `node` isn't found. — G.M., Apr 24 '18 at 16:37
@JesperJuhl , I agree. This is not necessary here. But this does not solve the problem)) — dissfall, Apr 24 '18 at 16:42
Check for errors. What does `/usr/bin/which node` output when run at a command prompt? — G.M., Apr 24 '18 at 16:52
@G.M. in `bash` it returns `/home/george/.nvm/versions/node/v8.9.4/bin/node`. This is what I need to get in `Qt` — dissfall, Apr 24 '18 at 16:53
@G.M. I add project on GitHub. Proble in [this](https://github.com/Dissfall/nodeGator/blob/develop/mainwindow.cpp) file. I added a comment. Maybe it will be helpful — dissfall, Apr 24 '18 at 17:02

Ľubomír Carik · Answer 1 · 2018-04-24T17:38:44.100

1

It may depend under what shell is running your app in QtCreator and under what one in terminal (bash/sh/csh etc.). The PATH variable may differ;

u can check process.exitCode() i.e. when 'which' doesn't find tool, it return 1; otherwise 0

may be, try to list the env. with:

qDebug() << "env:" << QProcessEnvironment::systemEnvironment().toStringList();

You can see actual settings in QtCreator -> Projects -> ur KIT -> Run and "Run Environment" details. There is an option to set in which environment the app is running: build/system/clear - try change.

edited Apr 24 '18 at 17:38

answered Apr 24 '18 at 17:27

Ľubomír Carik

387
5
11

Thanks for answer. First way is worked. It's wery helpfull for me. I checked environment variables. In this moment `SHELL=/bin/bash`. – dissfall Apr 24 '18 at 17:55
This turned out to be really valuable. The app was not working from Qt-Creator, but it was working if I execute the binary independently from the build folder. Thanks. – C-- Aug 16 '18 at 16:12

The command started in the QProcess does not return a response on linux

1 Answers1