Maintenancetool and QProcess, --checkupdates argument

[J.Hilk]

Hi everyone,

I'm using the QtInstallerframework to distribut my program and keep it up to date. I'm quite happy with it, and it works well enough for my case.

I would now like to streamline the update, add and remove packages process for the user. I thought about downloading and parsing the xml files myself and downloading and decompressing the 7z files too, but I realised that the maintenancetool has nearly all features build in, and I could simply use QProcess and an argument string list.

But, I'm a bit confused about how it's working, take for example this code

    QStringList args;args << "--checkupdates";
    qDebug() << "####" << endl;
    int exitCode = QProcess::execute("C:/path//to/the/maintenancetool.exe", args);
    qDebug() << endl << "exitCode" << exitCode;

it returns, 1 when no updates are available, and 0 when there are some, easy enough.

However looking at the Applicationoutput console, I see this:

Where does the xml formated part come from !? oO And is there a way to catch that string for further evaluations? It would save me from parsing the generated components.xml file

Greetings.

[sierdzio]

Perhaps you need to merge the output channels. See the docs

[J.Hilk]

@sierdzio ah, I see!

So far my experience with QProcess is limited, so thanks for the given direction!

I was able to adjust the "process" with QProcess 😏

For what ever reason, I was forced to create the QProcess object on the heap and use start instead of execute.
Or the process would still send the output to the standartoutput.

    QStringList args;args << "--checkupdates";
    qDebug() << "####" << endl;
    QProcess *process = new QProcess(this);

    qDebug() << process->processChannelMode();
    process->setProcessChannelMode(QProcess::MergedChannels);
    qDebug() << process->processChannelMode();

    process->start("C:/Path/To/the/maintenancetool.exe", args);

    connect(process, QOverload<int>::of(&QProcess::finished), this, [=](int exitCode){
        qDebug() << endl << "exitCode" << exitCode;
        qDebug() << process->readAll() << endl;
    });

I can work with that, I think :)

thanks @sierdzio !

[sierdzio]

Thanks to you as well, for posting the solution. Maybe it will help somebody else, too :-)