How to download update installation automatically

[canid]

@sierdzio
Yes，How does QProcess pass the silent flag? thanks

[Bonnie]

I think Firefox has a background service to do the silent installation.
Seems like that it will wait untill all of the Firefox instances are manually exited and then install the update files silently.
And I feel that must be very complicated...

[sierdzio]

@canid said in How to download update installation automatically:

@sierdzio
Yes，How does QProcess pass the silent flag? thanks

That's a question to your installer, not me :-) Each installer technology handles it differently. And you can cook up a custom installer, too.

[canid]

@sierdzio
I use QProcess:: Start () to get the upgrade installed automatically, but how do I get the callback to restart after it's installed

[JonB]

@canid
Do you mean you want to know when the QProcess is finished, or something else?

[canid]

@JonB
Yes, I had some difficulties writing code when qprocess is finished

[JonB]

@canid
OK, so search the doc page for finished, and you'll come across signal https://doc.qt.io/qt-5/qprocess.html#finished. Put a slot on that. When it's hit, the sub-process has finished.

[Bonnie]

Does your installing include upgrading this currently running executable file and other files being used by it like the dlls?
If yes you can't wait the process to be finished, but exit immediately after starting the process detached, otherwise those files can never be upgraded.

[canid]

@Bonnie
My code writes like this, the installation program also started, but did not output "started". What's wrong with it?

QProcess *process = new QProcess(this);
process->start("D:\\mysoft.exe", QStringList()<<"/SILENT");
connect(process,&QProcess::started,this,[](){
        qDebug()<<"started";
    });

[Bonnie]

@canid
You should connect the signal before you call start.