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#include <QtCore>

void startProcess()
{
    {
//! [0]
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");
//! [0]
    }

    {
//! [1]
QProcess process;
QHash<QString, QString> env = QProcess::systemEnvironmentHash();
env.insert("TMPDIR", "C:\\MyApp\\temp"); // Add an environment variable
env["PATH"] += ";C:\\Bin";
process.setEnvironment(env);
process.start("myapp");
//! [1]
    }
}

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
    startProcess();
    return app.exec();
}