I want to run print command lpr -p programmatically through root privilege in Qt. Actually I want to print the pdf file using these command. This command is working through terminal but not through programmatically.
Thanks in advance.
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1Could you show the code where you try this? – andy Nov 12 '14 at 10:42
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1There is a good answer on how to gain root using capabilities: http://stackoverflow.com/questions/2483755/how-to-programmatically-gain-root-privileges – Sebastian Lange Nov 12 '14 at 12:04
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You should not need root privilege to run `lpr`, and you might want to use `lp` instead of `lpr` – Basile Starynkevitch May 03 '15 at 07:49
1 Answers
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you can run commands that need root privilege by running :
echo myPass | sudo -S lpr -p
Although it's not a good idea to echo your password in shell but you can do it in Qt via Qprocess like :
QProcess process1;
QProcess process2;
process1.setStandardOutputProcess(&process2);
process1.start("echo myPass");
process2.start("sudo -S lpr -p");
process2.setProcessChannelMode(QProcess::ForwardedChannels);
process2.waitForFinished(3000);
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