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Thread: List the output of ls /dev/tty* using QProcess

  1. #1
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    Default List the output of ls /dev/tty* using QProcess

    I am trying to list all the pattern of /dev/tty but it is giving the error ls: cannot access /dev/tty*: No such file or directory


    Qt Code:
    1. QProcess* process = new QProcess(this);
    2. QStringList sArgs;
    3. sArgs << "/dev/tty*";
    4. process->start("ls", sArgs);
    5. process->waitForFinished(-1);
    6. qDebug() << process->readAllStandardOutput();
    7. qDebug() << process->readAllStandardError();
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  2. #2
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    Default Re: List the output of ls /dev/tty* using QProcess

    And what is the problem? If the files do not exist or you do not have permission to see them, then they do not exist or you do not have permission. QProcess does not do UNIX shell wildcard expansion like your shell. There is no file called (literally) "/dev/tty*" and that is what ls is reporting. This is not a Qt issue.

    BTW: Qt has classes for interrogating the file system (e.g. QDir, QFileInfo)
    Last edited by ChrisW67; 3rd September 2013 at 07:31.

  3. #3
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    Default Re: List the output of ls /dev/tty* using QProcess

    QProcess run a process and not a shell so the * wilcard does not work.
    This will work, but it's ugly
    Qt Code:
    1. QProcess* process = new QProcess();
    2. process->start("sh -c \"ls /dev/tty*\"");
    3. process->waitForFinished(-1);
    4. qDebug() << process->readAllStandardOutput();
    5. qDebug() << process->readAllStandardError();
    To copy to clipboard, switch view to plain text mode 
    This is better :
    Qt Code:
    1. QDir lsDev("/dev/");
    2. lsDev.setNameFilters(QStringList() << "tty*");
    3. qDebug() << lsDev.entryList(QDir::System);
    To copy to clipboard, switch view to plain text mode 

  4. The following user says thank you to nix for this useful post:

    arunkumaraymuo1 (3rd September 2013)

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