C++ 如何重新启动我自己的 qt 应用程序？
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how to restart my own qt application?
提问by Klaus
i just asking myself how to restart my own qt application?
我只是问自己如何重新启动我自己的 qt 应用程序？
Can somebody please show me an example?
有人可以给我举个例子吗？
回答by masoud
To restart application, try:
要重新启动应用程序，请尝试：
#include <QApplication>
#include <QProcess>
...
// restart:
qApp->quit();
QProcess::startDetached(qApp->arguments()[0], qApp->arguments());
回答by rubenvb
I'm taking the other answers solutions, but better. No need for pointers, but there is a need for a ;after the whilestatement of a do { ... } while( ... );construct.
我正在接受其他答案的解决方案，但更好。不需要指针，但需要;在构造while语句之后do { ... } while( ... );。
int main(int argc, char *argv[])
{
const int RESTART_CODE = 1000;
do
{
QApplication app(argc, argv);
MainWindow main_window(app);
} while( app.exec() == RESTART_CODE);
return return_from_event_loop_code;
}
回答by braggPeaks
Assuming that 1337is your restart code:
假设1337是您的重启代码：
main.cxx
主文件
int main(int argc, char * argv[])
{
int result = 0;
do
{
QCoreApplication coreapp(argc, argv);
MyClass myObj;
result = coreapp.exec();
} while( result == 1337 );
return result;
}
myClass.cxx
myClass.cxx
qApp->exit(1337);
回答by Aise
Doing a real process restart without subclassing:
在没有子类化的情况下重新启动真正的进程：
QCoreApplication a(argc, argv);
int returncode = a.exec();
if (returncode == -1)
{
QProcess* proc = new QProcess();
proc->start(QCoreApplication::applicationFilePath());
}
return returncode;
Edit for Mac OS like earlier example.
像前面的示例一样针对 Mac OS 进行编辑。
To restart call
重新开始通话
QCoreApplication::exit(-1);
somewhere in your code.
在您的代码中的某处。
回答by Piotr Dobrogost
Take a look at How to restart an applicationthread on qtcentre.org, where muiseigives this code
在 qtcentre.org 上查看How to restart an applicationthread，muisei给出了这段代码
#define RESTART_CODE 1000
int main(int argc, char *argv[])
{
int return_from_event_loop_code;
QPointer<QApplication> app;
QPointer<MainWindow> main_window;
do
{
if(app) delete app;
if(main_window) delete main_window;
app = new QApplication(argc, argv);
main_window = new MainWindow(app);
return_from_event_loop_code = app->exec();
}
while(return_from_event_loop_code==RESTART_CODE)
return return_from_event_loop_code;
}
回答by Fivos Vilanakis
I just used the method described above and I noticed that my application crashes on restart. ...then I switched the following lines of code:
我刚刚使用了上面描述的方法，我注意到我的应用程序在重新启动时崩溃了。...然后我切换了以下代码行：
if(app) delete app;
if(main_window) delete main_window;
to:
到：
if(main_window) delete main_window;
if(app) delete app;
and it behaves OK. For some reason the window must be deleted first. Just a note for future readers.
它的行为正常。由于某种原因，必须先删除窗口。只是给未来的读者一个注释。
EDIT:...and a different approach for those who want a real process-restart: You can declare a myApp::Restart() method in your subclass of QApplication. The following version works OK on both MS-Windows & MacOS:
编辑：...对于那些想要真正重新启动进程的人来说，还有一种不同的方法：您可以在 QApplication 的子类中声明一个 myApp::Restart() 方法。以下版本在 MS-Windows 和 MacOS 上都可以正常工作：
// Restart Application
void myApp::Restart(bool Abort)
{
// Spawn a new instance of myApplication:
QProcess proc;
#ifdef Q_OS_WIN
proc.start(this->applicationFilePath());
#endif
#ifdef Q_OS_MAC
// In Mac OS the full path of aplication binary is:
// <base-path>/myApp.app/Contents/MacOS/myApp
QStringList args;
args << (this->applicationDirPath() + "/../../../myApp.app");
proc.start("open", args);
#endif
// Terminate current instance:
if (Abort) // Abort Application process (exit immediattely)
::exit(0);
else
this->exit(0); // Exit gracefully by terminating the myApp instance
}
回答by Eike
This slight variation on Rubenvb's idea works with PyQt. clearSettingsis the method that triggers the restart.
Rubenvb 想法的这种轻微变化适用于 PyQt。clearSettings是触发重启的方法。
class GuiMain
#Most of implementation missing
def clearSettings(self):
#Clearing the settings missing
QApplication.exit(GuiMain.restart_code)
restart_code = 1000
@staticmethod
def application_main():
"""
The application's main function.
Create application and main window and run them.
"""
while True:
app = QApplication(sys.argv)
window = GuiMain()
window.show()
ret = app.exec_()
if ret != GuiMain.restart_code:
break
del window
del app
回答by Angie Quijano
Here is the code:
这是代码：
main.cpp:
主.cpp：
int main(int argc, char *argv[])
{
int currentExitCode = 0;
do {
QApplication a(argc, argv);
MainWindow w;
w.show();
currentExitCode = a.exec();
} while( currentExitCode == MainWindow::EXIT_CODE_REBOOT );
return currentExitCode;
}
mainwindow.h
主窗口.h
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
static int const EXIT_CODE_REBOOT;//THIS IS THE IMPORTANT THING TO ADD TO YOUR CODE
~MainWindow();
private slots:
void slotReboot();//AND THIS ALSO
//ALL THE OTHER VARIABLES
}
The slotReboot()is the slot that will receive the signal of the QActionI'm going to show in the mainwindow.cpp
这slotReboot()是将接收QAction我将在 mainwindow.cpp 中显示的信号的插槽
mainwindow.cpp
主窗口.cpp
First initialize EXIT_CODE_REBOOT:
首先初始化EXIT_CODE_REBOOT：
int const MainWindow::EXIT_CODE_REBOOT = -123456789;
and declare a QActionpointer:
并声明一个QAction指针：
QAction* actionReboot;
then in the MainWindowconstructor:
然后在MainWindow构造函数中：
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
actionReboot = new QAction( this );
actionReboot->setText( tr("Restart") );
actionReboot->setStatusTip( tr("Restarts the application") );
connect( actionReboot, SIGNAL (triggered()),this, SLOT (slotReboot()));
}
And finally you need to send the signal (in the part of your code you need), in this way:
最后，您需要以这种方式发送信号（在您需要的代码部分）：
actionReboot->trigger();
I did the code I showed following these instructions: How to make an application restartable - Qt Wiki
我按照以下说明执行了我显示的代码：How to make an application restartable - Qt Wiki
