Print to screen from qDebug

[Mijaz]

QProcess process;

process.start("sudo devmem2 0x80000000");
process.waitForFinished(-1); // will wait forever until finished

QString stdout = process.readAllStandardOutput();
QString stderr = process.readAllStandardError();

qDebug() << stdout;
ui->lineEdit->setText(qDebug());

I want to display my qDebug to lineEdit in Qt.

[JonB]

@Mijaz
Your stdout is just a QString. So why qDebug()? You just need ui->lineEdit->setText(stdout);.

[Mijaz]

Hi @JonB Thanks, it works...

Can I define range like this?
ui->lineEdit->setText(stdout[90:105]);

[JonB]

@Mijaz
Where does QString (or C++) define a [start:end] "range operator"? Since it does not (you're not in Python!), no you cannot do that. Read the docs for QString, e.g. https://doc.qt.io/qt-5/qstring.html#mid.

[J.Hilk]

@JonB not yet, but there's an awful amount of talking about it for c++20 ....

[JonB]

@J-Hilk
Just great. C was fine, let's make C++ more like hideous Python... ;-)

[J.Hilk]

@JonB well, that's one way of looking at it, I think its nice, that after 35 Years, the user base still grows and the language still adapts new features :)

look at this beauty and tell me its hideous :P

int main()
{
    std::vector<int> ints{0,1,2,3,4,5};
    auto even = [](int i){ return 0 == i % 2; };
    auto square = [](int i) { return i * i; };
 
    for (int i : ints | std::views::filter(even) | std::views::transform(square)) {
        std::cout << i << ' ';
    }
}

//Output: 0 4 16

[JonB]

@J-Hilk
This is probably not the place for a discussion, but yes I think it's hard to read/understand. WTF is that | logical-or operator doing in the for against arrays? (Yes, I can guess...) Is it really easier to read or more efficient than an if inside the loop? Depending on how that for ( ... | ...) is implemented, it could be hideously inefficient!