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:
0_1530855237974_1b6aef9b-6024-4aa2-a948-8ebbf55b33a5-image.png

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.

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;
    });

0_1530858422878_a7f04752-528c-4687-9407-7a4fe4f2f6c2-image.png

I can work with that, I think :)

thanks @sierdzio !

sierdzio

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

J.Hilk