Run Linux commands from Qt4

Question

How can I run command-line programs under Linux from Qt4? And of course I want to obtain the output in some way I can use. I'd use it for an ls | grep, but it's good to know for any future issues.

Except when you're talking about one of its bindings (yes, I've seen that happen), but I'll let it slide. — Ignacio Vazquez-Abrams, Jan 27 '10 at 15:54
If you don't want to block your app while QProcess runs look at the answer to this question: http://stackoverflow.com/questions/10098980/real-time-display-of-qprocess-output-in-a-textbrowser — parsley72, Jan 25 '14 at 06:15

score 24 · Accepted Answer · answered Jan 27 '10 at 15:58

24

QProcess p;
p.start( /* whatever your command is, see the doc for param types */ );
p.waitForFinished(-1);

QString p_stdout = p.readAllStandardOutput();
QString p_stderr = p.readAllStandardError();

answered Jan 27 '10 at 15:58

Fred

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score 2 · Answer 2 · answered Jan 27 '10 at 15:39

2

Use QProcess.

answered Jan 27 '10 at 15:39

e8johan

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For some tasks, it might be easier (or more robust) to roll your own code - you mention ls | grep, potentially QDir with a filter or a QRegExp might do what you need. For the general case, though, QProcess is absolutely the best way to go. – James Turner Jan 27 '10 at 15:43
That's a great observation. I think I'll try that another time but the question in this case was also somewhat oriented for the general case for future uses. Thanks anyway! – StJimmy Jan 27 '10 at 22:29

score 0 · Answer 3 · edited Nov 17 '11 at 14:06

0

What about using popen?

edited Nov 17 '11 at 14:06

answered Jan 27 '10 at 15:50

t0mm13b

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e8johan: True...I understand you want to use QT API but thought I'd give this answer. :) – t0mm13b Jan 27 '10 at 15:55

Run Linux commands from Qt4

3 Answers3

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