Qt实现程序重启功能

主要逻辑就是退出当前进程，QProcess::startDetached 开启新的进程

1.简化版

    const QString program = QCoreApplication::applicationFilePath();
    const QStringList arguments = QCoreApplication::arguments();
    const QString directory = QDir::currentPath();
    QCoreApplication::exit();
    QProcess::startDetached(program, arguments, directory);

2.Qt Creator源码版

class Restarter
{
public:
    Restarter(int argc, char *argv[])
    {
        Q_UNUSED(argc)
        m_executable = QString::fromLocal8Bit(argv[0]);
        m_workingPath = QDir::currentPath();
    }

    void setArguments(const QStringList &args) { m_args = args; }

    QString executable() const { return m_executable; }
    QStringList arguments() const { return m_args; }
    QString workingPath() const { return m_workingPath; }

    int restartOrExit(int exitCode)
    {
        return qApp->property("restart").toBool() ? restart(exitCode) : exitCode;
    }

    int restart(int exitCode)
    {
        QProcess::startDetached(m_executable, m_args, m_workingPath);
        return exitCode;
    }

private:
    QString m_executable;
    QStringList m_args;
    QString m_workingPath;
};

int main(int argc, char **argv)
{
    Restarter restarter(argc, argv);
    QApplication app(argc, argv);
    //可以加一些参数传递给重启后应用
    restarter.setArguments(app.arguments());
    //... ...
    //qApp->setProperty("restart",true);
    //... ...
    return restarter.restartOrExit(app.exec());
}