source: tests/corelib/process/process.cpp

#include <QtCore>
#include <QtGui>

#include <QDebug>

#include <stdlib.h>

#define STR(expr) #expr
#define DBG(expr) STR(expr) << "=" << (expr)

////////////////////////////////////////////////////////////////////////////////

bool testGSAvailability(const QString& gsPath)
{
    qDebug() << DBG(gsPath);

    QStringList args;
    args.append( "-h" );

    QProcess proc;
    proc.start(gsPath, args);
    if (!proc.waitForStarted(5000))
        return false;

    proc.waitForFinished(5000);
    return (proc.exitCode() == 0);
}

class MyMessageBox : public QMessageBox
{
public:

        MyMessageBox() : QMessageBox (QMessageBox::Information, QLatin1String ("Title"), QLatin1String ("text")) {}

    virtual void contextMenuEvent (QContextMenuEvent *ev)
    {
        qDebug() << "Test QProcess";
        bool result = testGSAvailability (QLatin1String ("c:/gs/gs8.71/bin/gsos2.exe"));
        qDebug() << DBG(result);
    }
};

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

        MyMessageBox mbox;
    mbox.show();

        app.exec();

//    bool result = testGSAvailability (QLatin1String ("c:/gs/gs8.71/bin/gsos2.exe"));
//    qDebug() << DBG(result);

    return 0;
}