CODEWITHSUNDEEP
qt
suma
suma

Reputation: 728

unable to use fromStdString in qt

I am unable to use the function fromStdString. it is said in the qt assistant that, "This operator is only available if Qt is configured with STL compatibility enabled.". but i don know how to enable this. please provide the solution.

 int main(int argc, char *argv[])
    {
        std::string read;
        QString monthsArr[12];
        QStringList monthlist;
        std::ifstream readfile;
        readfile.open("/home/pcamdin/practice/qtcpp/qtprogs/qtcpp/months.txt");
        for(int i=0; i<6; i++)
        {
            readfile >> read;
            monthsArr[i] = fromStdString(read);
            monthlist << monthsArr[i];
            qDebug() << i+1 << ": " << monthsArr[i];
        }

        qDebug() << "the first " << monthlist.size() << " months of the year are " << monthlist;
    }

Upvotes: 1

Views: 2286

Answers (2)

wer
wer

Reputation: 116

Even if Qt was configured with -no-stl you can interact with std::string and containers, it only disables some syntactictic sugar. You can e.g. used QString::fromLatin1(some_std_string.c_str(), some_std_string.size()) or QString::fromUtf8(...) or fromLocal8bit(...) depending on the encoding of the data in the std::string. This is arguably favorable in any case as it makes the encoding concersion explicit.

Upvotes: 2

badgerr
badgerr

Reputation: 7982

STL support is compiled in by default (at least when you build it yourself).

Unless something has changed in 4.8 that I am unaware of, fromStdString is a static member of QString, so you should be calling it like

monthsArr[i] = QString::fromStdString(read);

Simply calling fromStdString in the global namespace does not compile under 4.7.3.

Upvotes: 3

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