source: smplayer/trunk/src/myprocess.h

/*  smplayer, GUI front-end for mplayer.
    Copyright (C) 2006-2017 Ricardo Villalba <rvm@users.sourceforge.net>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef MY_PROCESS_H
#define MY_PROCESS_H

#include <QProcess>
#include <QTemporaryFile>
#include <QTimer>

//! MyProcess is a specialized QProcess designed to properly work with mplayer.

/*!
 It can split the mplayer status line into lines.
 It also provides some Qt 3 like functions like addArgument().

 There are two working modes, controlled by the USE_TEMP_FILE define.
 If USE_TEMP_FILE is 1 it will send the output of mplayer to a temporary
 file, and then it will be read from it. Otherwise it will read from
 standard ouput as usual.
*/

class MyProcess : public QProcess
{
        Q_OBJECT

public:
        MyProcess ( QObject * parent = 0 );

        virtual void setExecutable(const QString & p) { program = p; };
        QString executable() { return program; };

        virtual void addArgument(const QString & a);    //!< Add an argument

        void clearArguments();          //!< Clear the list of arguments
        QStringList arguments();        //!< Return the list of arguments

        void start();                           //!< Start the process
        bool isRunning();                       //!< Return true if the process is running

        static QStringList splitArguments(const QString & args);

signals:
        //! Emitted when there's a line available
        void lineAvailable(QByteArray ba);

protected slots:
        void readStdOut();                      //!< Called for reading from standard output
        void readTmpFile();                     //!< Called for reading from the temp file
        void procFinished();            //!< Called when the process has finished

protected:
        //! Return true if it's possible to read an entire line.
        /*! @param from specifies the position to begin. */
        int canReadLine(const QByteArray & ba, int from = 0);
        //! Called from readStdOut() and readTmpFile() to do all the work
        void genericRead(QByteArray buffer);

protected:
        QString program;
        QStringList arg;

        QByteArray remaining_output;

        QTemporaryFile temp_file;
        QTimer timer;
};

#endif