A simple way to restart QT application in embedded Linux (based on QT4.8 qws)

Application software generally has such business requirements:

When a new version of the APP is available, the program needs to be updated. After the update is completed (the so-called update is mostly in the form of overwriting), there is no need to shut down the computer, but the application can restart itself.

I checked some information online, but the descriptions were very complicated. It would be simpler, faster and more brutal to create a script to complete my work in batches.

In the program, you can restart through QT's thread library function, or you can simply call an external script to complete the restart work.

qApp->closeAllWindows();
system("/opt/app/restart_app.sh");

As you can see here, restart_app.sh is an external script.

The external script contains the following:

#!/bin/sh
killall -9 my_app
echo "restart my_app!"
#close backlight
echo 0 > /sys/class/backlight/backlight/brightness
/opt/app/my_app -qws -nomouse -font wqy-microhei &

When the script is executed, it will first call killall -9 my_app to close the current process with the same name as my app, then turn off the backlight and turn off the LCD. Finally, restart the app and run it in the background.

This simply completes the restart of the app.

Summarize

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