C++/Qt/QProcess

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Invoke system application with QProcess

<source lang="cpp"> /****************************************************************************

    • Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
    • All rights reserved.
    • Contact: Nokia Corporation (qt-info@nokia.com)
    • This file is part of the documentation of the Qt Toolkit.
    • $QT_BEGIN_LICENSE:LGPL$
    • Commercial Usage
    • Licensees holding valid Qt Commercial licenses may use this file in
    • accordance with the Qt Commercial License Agreement provided with the
    • Software or, alternatively, in accordance with the terms contained in
    • a written agreement between you and Nokia.
    • GNU Lesser General Public License Usage
    • Alternatively, this file may be used under the terms of the GNU Lesser
    • General Public License version 2.1 as published by the Free Software
    • Foundation and appearing in the file LICENSE.LGPL included in the
    • packaging of this file. Please review the following information to
    • ensure the GNU Lesser General Public License version 2.1 requirements
    • will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    • In addition, as a special exception, Nokia gives you certain additional
    • rights. These rights are described in the Nokia Qt LGPL Exception
    • version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
    • GNU General Public License Usage
    • Alternatively, this file may be used under the terms of the GNU
    • General Public License version 3.0 as published by the Free Software
    • Foundation and appearing in the file LICENSE.GPL included in the
    • packaging of this file. Please review the following information to
    • ensure the GNU General Public License version 3.0 requirements will be
    • met: http://www.gnu.org/copyleft/gpl.html.
    • If you have questions regarding the use of this file, please contact
    • Nokia at qt-info@nokia.com.
    • $QT_END_LICENSE$
                                                                                                                                                        • /
  1. include <QApplication>
  2. include <QtGui>

int main(int argc, char *argv[]) { 

   QApplication app(argc, argv);
   QObject *parent;
   parent = &app;

   QString program = "./path/to/Qt/examples/widgets/analogclock";
   program = "./../../../../examples/widgets/analogclock/analogclock";

   QStringList arguments;
   arguments << "-style" << "motif";
   QProcess *myProcess = new QProcess(parent);
   myProcess->start(program, arguments);

   return app.exec();

} 


 </source>


QProcess::systemEnvironment()

<source lang="cpp"> /****************************************************************************

    • Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
    • All rights reserved.
    • Contact: Nokia Corporation (qt-info@nokia.com)
    • This file is part of the documentation of the Qt Toolkit.
    • $QT_BEGIN_LICENSE:LGPL$
    • Commercial Usage
    • Licensees holding valid Qt Commercial licenses may use this file in
    • accordance with the Qt Commercial License Agreement provided with the
    • Software or, alternatively, in accordance with the terms contained in
    • a written agreement between you and Nokia.
    • GNU Lesser General Public License Usage
    • Alternatively, this file may be used under the terms of the GNU Lesser
    • General Public License version 2.1 as published by the Free Software
    • Foundation and appearing in the file LICENSE.LGPL included in the
    • packaging of this file. Please review the following information to
    • ensure the GNU Lesser General Public License version 2.1 requirements
    • will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    • In addition, as a special exception, Nokia gives you certain additional
    • rights. These rights are described in the Nokia Qt LGPL Exception
    • version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
    • GNU General Public License Usage
    • Alternatively, this file may be used under the terms of the GNU
    • General Public License version 3.0 as published by the Free Software
    • Foundation and appearing in the file LICENSE.GPL included in the
    • packaging of this file. Please review the following information to
    • ensure the GNU General Public License version 3.0 requirements will be
    • met: http://www.gnu.org/copyleft/gpl.html.
    • If you have questions regarding the use of this file, please contact
    • Nokia at qt-info@nokia.com.
    • $QT_END_LICENSE$
                                                                                                                                                        • /
  1. include <QtCore>

void startProcess() { QProcess process; QStringList env = QProcess::systemEnvironment(); env << "TMPDIR=C:\\MyApp\\temp"; // Add an environment variable env.replaceInStrings(QRegExp("^PATH=(.*)", Qt::CaseInsensitive), "PATH=\\1;C:\\Bin"); process.setEnvironment(env); process.start("myapp"); } int main(int argc, char *argv[]) { 

   QCoreApplication app(argc, argv);
   startProcess();
   return app.exec();

} 


 </source>


Synchronous Use of QProcess

<source lang="cpp">

  1. include <QtGui>

int main(int argc, char* argv[]) { 

 QApplication app(argc, argv);
 QProcess tar;
 QStringList env = QProcess::systemEnvironment();
 env.replaceInStrings(QRegExp("^LANG=(.*)"),"LANG=C");
 tar.setEnvironment(env);
 QStringList args;
 args << "tf" << argv[1];
 tar.start("tar", args);
 QByteArray output;
 while (tar.waitForReadyRead() )
   output += tar.readAll();
 QStringList entries = QString::fromLocal8Bit(output).split("\n");
 entries.removeLast();
 QListWidget w;
 QIcon fileIcon = app.style()->standardIcon(QStyle::SP_FileIcon);
 QIcon dirIcon = app.style()->standardIcon(QStyle::SP_DirClosedIcon);
 foreach(QString entry, entries) {
   if (entry.endsWith("/"))
     new QListWidgetItem(dirIcon, entry, &w);
   else
     new QListWidgetItem(fileIcon, entry, &w);
 }
 w.show();
 return app.exec();

} 


 </source>


Using QProcess

<source lang="cpp">

/****************************************************************************

    • Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
    • All rights reserved.
    • Contact: Nokia Corporation (qt-info@nokia.com)
    • This file is part of the documentation of the Qt Toolkit.
    • $QT_BEGIN_LICENSE:LGPL$
    • Commercial Usage
    • Licensees holding valid Qt Commercial licenses may use this file in
    • accordance with the Qt Commercial License Agreement provided with the
    • Software or, alternatively, in accordance with the terms contained in
    • a written agreement between you and Nokia.
    • GNU Lesser General Public License Usage
    • Alternatively, this file may be used under the terms of the GNU Lesser
    • General Public License version 2.1 as published by the Free Software
    • Foundation and appearing in the file LICENSE.LGPL included in the
    • packaging of this file. Please review the following information to
    • ensure the GNU Lesser General Public License version 2.1 requirements
    • will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    • In addition, as a special exception, Nokia gives you certain additional
    • rights. These rights are described in the Nokia Qt LGPL Exception
    • version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
    • GNU General Public License Usage
    • Alternatively, this file may be used under the terms of the GNU
    • General Public License version 3.0 as published by the Free Software
    • Foundation and appearing in the file LICENSE.GPL included in the
    • packaging of this file. Please review the following information to
    • ensure the GNU General Public License version 3.0 requirements will be
    • met: http://www.gnu.org/copyleft/gpl.html.
    • If you have questions regarding the use of this file, please contact
    • Nokia at qt-info@nokia.com.
    • $QT_END_LICENSE$
                                                                                                                                                        • /
  1. include <QProcess>

bool zip() { 

   QProcess gzip;
   gzip.start("gzip", QStringList() << "-c");
   if (!gzip.waitForStarted())
       return false;
   gzip.write("Qt rocks!");
   gzip.closeWriteChannel();
   if (!gzip.waitForFinished())
       return false;
   QByteArray result = gzip.readAll();

   gzip.start("gzip", QStringList() << "-d" << "-c");
   gzip.write(result);
   gzip.closeWriteChannel();
   if (!gzip.waitForFinished())
       return false;
   qDebug("Result: %s", gzip.readAll().data());
   return true;

}

int main() { 

   zip();
   return 0;

} 


 </source>
Источник — «http://cppe.ru/index.php?title=C%2B%2B/Qt/QProcess&oldid=1079»