'How to disable output of QProcess

I want to execute an external program in Qt and just get the return code. I do not want to see any ouput in the terminal whatsoever. I tried to redirect stderr and stdout to a file but the output of the command is still being printed on screen.

bool checkHostAlive(const QString& host, bool surpressOutput) {
    QStringList parameters;
#if defined(WIN32)
    parameters << "-n" << "1";
#else
    parameters << "-c 1";
#endif

    parameters << host;

    auto proc = QProcess();

    if(surpressOutput) {
        // Surpress ping output
        auto fileStdOut = QString();
        auto fileStdErr = QString();
        proc.setStandardErrorFile(fileStdErr);
        proc.setStandardOutputFile(fileStdOut);
    }

    if (proc.execute("ping", parameters) == 0) {
        return true;
    }

    return false; 
}
c++qtqprocess


Solution 1:[1]

See e.g. https://doc.qt.io/qt-5/qprocess.html#setStandardErrorFile , which suggests nullDevice() as special value; alternately, look into https://doc.qt.io/qt-5/qprocess.html#ProcessChannelMode-enum -- the default is SeparateChannels, which should send output to the calling program.

(Note that the "-c 1" for non-Windows is probably wrong; either -c1 or two separate elements in the stringlist)

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Adriaan de Groot

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