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How to get File Header Infos? SOLVED

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  • V Offline
    V Offline
    Vittorio
    wrote on last edited by
    #1

    Hi, all,

    is there a way in Qt, to get file infos like the linux-comand "file" gives?

    For example, when I type in my shell
    "file abc.dd" I get the result "abc.dd: SQLite 3.x database"

    And now I want to do the same using Qt...

    thanks in advance,
    Viktor

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    • S Offline
      S Offline
      Seba84
      wrote on last edited by
      #2

      Well, you can use "QProcess":http://qt-project.org/doc/qt-5.0/qtcore/qprocess.html inside Qt to launch the linux-command file and then recover the output.

      Example:
      @QString program = "/usr/bin/file";
      QStringList arguments;
      arguments << "/home/myfile.txt";

      QProcess *myProcess = new QProcess(parent);
      myProcess->start(program, arguments);

      if (!myProcess.waitForFinished())
      return false;

      QByteArray result = myProcess.readAll();@

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      • V Offline
        V Offline
        Vittorio
        wrote on last edited by
        #3

        thanks for your peply, I found an easier way: read the magic Number, which defines the file type, with QStream.

        Example:

        @QFile filetest(fileName); //fileName is a result of an openfile-dialog
        filetest.open(QIODevice::ReadOnly);
        QDataStream in(&filetest);
        qint32 magicNumber;
        in >> magicNumber;@

        now "magicNumber" contains the value for, in my example, sqlite-files...

        thanks anyway!

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