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c++qtprintingroot-access

How to run print command lpr -p programmatically throgh root privilage in Qt

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.

Solution

  • 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);