如何在qt中重新启动应用程序？ [英] how to restart an application in qt?

问题描述

我这样做是为了重新启动我的游戏，但程序有错误。我想显示一个 QDialog 当用户丢失。在 QDilag 我放两个按钮为retry和exit.also我有一个 QDialog 游戏开始。我的错误在哪里？ （我读了类似的问题，并根据这些，但我有问题）

I do this works for restarting my game but program has error .I want to show a QDialog when user losses .In this QDilag i put two pushbutton for retry and exit.also i have a QDialog for beginning of game.Where is my mistake? (I read similar questions and do according these but yet i have problem)

extern  int const EXIT_CODE_REBOOT;
mydialog_end::mydialog_end(QWidget *parent) :
QDialog(parent
{
  retry=new QPushButton(this);
  exit=new QPushButton(this);
  retry->setText("RETRY");
  exit->setText("EXIT");
  connect(retry,SIGNAL(clicked()),this,SLOT(on_retry_clicked()));
  connect(exit,SIGNAL(clicked()),this,SLOT(on_exit_clicked()));
 }
 void mydialog_end::on_retry_clicked()
 {
   qApp->exit(EXIT_CODE_REBOOT);
   accept();
  }
  void mydialog_end::on_exit_clicked()
  {
    //what do i do for end of game?
    reject();
  }
  //////////////in class myenemy///////
  public slots:
  void loss();
  void Myenemy1::loss()
  {
    if(this->collidesWithItem(_mario))
    {
      //do something....
      mydialog_end dialog;
      dialog.exec();
     }
    }
    //////////////in main////////////
 extern int const RESTART_CODE;
 int main(int argc, char *argv[])
{
  Mydialogstart dlg;//a dialog for beginning game
  int state= dlg.exec();
  int return_from_event_loop_code=0;
 do
{
    QApplication a(argc, argv);
    MainWindow w;
    if( state==QDialog::Accepted)
    {
        w.show();
        qDebug()<<"accepted";
    }
    else if(state==QDialog::Rejected)
    {
        qDebug()<<"rejected";
        dlg.close();
        return 0;
    }
    return_from_event_loop_code = a.exec();

} while(return_from_event_loop_code==RESTART_CODE);

  return return_from_event_loop_code;
}

推荐答案

$ c> QProcess :: startDetached 在新进程中运行应用程序的实例并从其中分离。之后，您应该退出应用程序：

You can use QProcess::startDetached to run an instance of your application in a new process and detach from it. After that you should exit the application :

QProcess process;
process.startDetached("myApp",QStringList());

qApp->quit();

这里 myApp 文件。在Windows上，它可以 myApp.exe 。

Here myApp is the name of the executable file of the application. On Windows it can be myApp.exe.

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