How to Restart Qt Application _Application

贵有恒，何必三更起、五更眠、最无益，只怕一日曝、十日寒。这篇文章主要讲述How to Restart Qt Application相关的知识，希望能为你提供帮助。
How to restart QtApplication
As we know, Restarting Application means to exit current application, then to call another application. So, let‘s see how exit of one application.
Qt Application

int main(int argc, char** argv) { QApplication app(argc, argv); Widget w; w.show() return app.exec(); }

The code snippet,last line return app.exec() let Qt application in main event loop. if you want to exit main event loop, Just call

QCoreApplication::exit(int);

QCoreApplication::quit();

QApplication has one property called quitOnLastWindowClosed, it means the application will exit after last window closed.
About how to close all windows, we can use QApplication::closeAllWindows(), It is better way for using quit to exit application. That way, We can let all windows object revice close event, and do some thing before destroy.
Call another ApplicationIn Qt, It is better let QProcess to do this. It let another application to run and not has father-son relationship.

QProcess::startDetached(qApp-> applicationFilePath(), QStringList());

if applicationFilePath not continues space char, we can use

QProcess::startDetached(qApp-> applicationFilePath());

Example one

qApp-> quit(); QProcess::startDetached(qApp-> applicationFilePath(), QStringList());

【How to Restart Qt Application】or

qApp-> closeAllWindow(); QProcess::startDetached(qApp-> applicationFilePath(), QStringList());

Example two

/**773 = ' r' +' e' +' s' +' t' +' a' +' r' +' t' */ qApp-> exit(773);

int main(int argc, char** argv) { int ret = app.exec(); if (ret == 773) { QProcess::startDetached(qApp-> applicationFilePath(), QStringList()); return 0; } return ret; }