QCommandLineParser booleans

[Wolosocu]

In the details section for QCommandLineParser (https://doc.qt.io/qt-5/qcommandlineparser.html#details) the following example is given for C++11 compilers:

    parser.addOptions({
        // A boolean option with a single name (-p)
        {"p",
            QCoreApplication::translate("main", "Show progress during copy")},
        // A boolean option with multiple names (-f, --force)
        {{"f", "force"},
            QCoreApplication::translate("main", "Overwrite existing files.")},
        // An option with a value
        {{"t", "target-directory"},
            QCoreApplication::translate("main", "Copy all source files into <directory>."),
            QCoreApplication::translate("main", "directory")},
    });

However the documentation does not tell you how to check for p or f when using this method. The examples on the page only show you how to check booleans when using a QCommandLineOption object, but you obviously don't have one handy when using the above syntax.

How can this be done?

[Kent-Dorfman]

I've never used the class, but it looks like you just check the member function isSet() after running the parse() method.

parser.parse()
if (parser.isSet("p")) { /* "-p" was passed */ }

OK...I guess it's process(), not parse()

[Christian Ehrlicher]

QParser::isSet() also takes a QString.

[jsulm]

This post is deleted!

[Wolosocu]

I should have clarified, the QCommandLineParser::isSet(const QString&) method uses the option's name, which is not set in the construction I showed. In other words, that doesn't work.

In the example above if you try parser.isSet('p') it always returns false.

[KroMignon]

@Wolosocu said in QCommandLineParser booleans:

parser.isSet('p') i

Did you try parser.isSet('p') or parser.isSet("p") ?

For me this should work:

int main(int argc, char *argv[])
{
    // Setting up QCoreApplication
    QCoreApplication app(argc, argv);

    // Setting up command line options
    QCommandLineParser parser;
    parser.addOptions({
        // A boolean option with a single name (-p)
        {"p",
            QCoreApplication::translate("main", "Show progress during copy")},
        // A boolean option with multiple names (-f, --force)
        {{"f", "force"},
            QCoreApplication::translate("main", "Overwrite existing files.")},
        // An option with a value
        {{"t", "target-directory"},
            QCoreApplication::translate("main", "Copy all source files into <directory>."),
            QCoreApplication::translate("main", "directory")},
    });

    // Process the actual command line arguments given by the user
    parser.process(app);

    if(parser.isSet("p"))
    {
        qDebug() << "Found";
    }
    ...
}

[SGaist]

Hi,

parser.isSet('p') won't build as there's no overload for a char.

parser.isSet("p") works as expected provided you called parser.process(app); before checking for p.

[Christian Ehrlicher]

@Wolosocu said in QCommandLineParser booleans:

method uses the option's name, which is not set in the construction I showed

You're wrong: QCommandLineOption::QCommandLineOption(const QString &name, const QString &description, const QString &valueName = QString(), const QString &defaultValue = QString())

[Wolosocu]

@Christian-Ehrlicher

Ah yes.

And of course today, using the isSet("p"); works even though I swear it wasn't last night. Ah well. Thanks for the answers everyone.