如何运行打印命令lpr -p以编程方式在Qt中调用root privilage [英] How to run print command lpr -p programmatically throgh root privilage in Qt

问题描述

我想通过Qt中的root权限以编程方式运行打印命令 lpr -p 。实际上，我想使用这些命令打印pdf文件。

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.

提前感谢。

推荐答案

您可以运行需要root权限的命令：

you can run commands that need root privilege by running :

echo myPass | sudo -S lpr -p

虽然在shell中回显密码不是个好主意，在Qt中通过 Qprocess 如：

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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