kpipeprocess.cpp

00001 /*
00002  *  This file is part of the KDE libraries
00003  *  Copyright (c) 2001 Michael Goffioul <kdeprint@swing.be>
00004  *
00005  *  This library is free software; you can redistribute it and/or
00006  *  modify it under the terms of the GNU Library General Public
00007  *  License version 2 as published by the Free Software Foundation.
00008  *
00009  *  This library is distributed in the hope that it will be useful,
00010  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  *  Library General Public License for more details.
00013  *
00014  *  You should have received a copy of the GNU Library General Public License
00015  *  along with this library; see the file COPYING.LIB.  If not, write to
00016  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00017  *  Boston, MA 02110-1301, USA.
00018  **/
00019 
00020 #include "kpipeprocess.h"
00021 
00022 KPipeProcess::KPipeProcess(const QString& cmd, int mode)
00023 : QFile()
00024 {
00025     m_pipe = NULL;
00026     if (!cmd.isEmpty())
00027         open(cmd,mode);
00028 }
00029 
00030 KPipeProcess::~KPipeProcess()
00031 {
00032     close();
00033 }
00034 
00035 bool KPipeProcess::open(const QString& cmd, int mode)
00036 {
00037     // close first if needed
00038     close();
00039     // check supported modes
00040     if (mode != IO_ReadOnly && mode != IO_WriteOnly)
00041         return false;
00042 
00043     // create the pipe
00044     m_pipe = popen(cmd.latin1(),(mode == IO_WriteOnly ? "w" : "r"));
00045     if (m_pipe)
00046         if (!QFile::open(mode,m_pipe))
00047             close();
00048     return (m_pipe != NULL);
00049 }
00050 
00051 void KPipeProcess::close()
00052 {
00053     if (m_pipe != NULL)
00054     {
00055         QFile::close();
00056         /* pipe must be close to be sure the process is terminated */
00057         pclose( m_pipe );
00058         m_pipe = NULL;
00059     }
00060 }
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