Assign value to a string in a struct

russjohn834

Hi all,

I have basic c++ question:
I have a following struct which need to be passed by a function:

 struct parsedData
    {
        std::string firstName;
        std::string surName;
        std::string patientID;
        std::string lastSession;
        std::string note;
        
    } newdata;

How do I assign values to each string in the struct

if I do this:

       if(xmlReader->name() == "Name") {
                newdata.firstName = xmlReader->readElementText();
}

I'm getting error says no viable overloaded '='

Could you please point out my mistake?

jsulm

@russjohn834 What is xmlReader here and what does readElementText return (I guess it does not return a std::string, so you need to convert)? Also you should post whole error message.

russjohn834

@jsulm

xmlReader is a QxmlStreamReader, I do this:

QXmlStreamReader *xmlReader;
 xmlReader = new QXmlStreamReader(xmlFile);

// Parse each element of the XML until we reach the end.
    while(!xmlReader->atEnd() && !xmlReader->hasError()) {
        // Read next element
        QXmlStreamReader::TokenType token = xmlReader->readNext();

        // If token is just StartDocument - go to next
        if(token == QXmlStreamReader::StartDocument) {
            continue;
        }

        // If token is StartElement - read it
        if(token == QXmlStreamReader::StartElement) {

            if(xmlReader->name() == "Name") {
                newdata.firstName = xmlReader->readElementText();

            } else if(xmlReader->name() == "Surname") {
                newdata.surName = xmlReader->readElementText();
            }
            else if(xmlReader->name() == "Patient_ID") {
                newdata.patientID = xmlReader->readElementText();
            }
            else if(xmlReader->name() == "Date") {
                newdata.lastSession = xmlReader->readElementText();
            }
        }
    }

error says this:

patientdata.cpp:53:35: error: no viable overloaded '='
xstring:925:8: note: candidate function not viable: no known conversion from 'QString' to 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Myt' (aka 'basic_string<char, std::char_traits<char>, std::allocator<char> >') for 1st argument
xstring:983:8: note: candidate function not viable: no known conversion from 'QString' to '::std::initializer_list<char>' for 1st argument
xstring:1022:8: note: candidate function not viable: no known conversion from 'QString' to 'const std::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Myt' (aka 'const basic_string<char, std::char_traits<char>, std::allocator<char> >') for 1st argument
xstring:1038:8: note: candidate function not viable: no known conversion from 'QString' to 'const char *' for 1st argument
xstring:1043:8: note: candidate function not viable: no known conversion from 'QString' to 'char' for 1st argument

jsulm

@russjohn834 So, it returns a QString. Next step is to read https://doc.qt.io/qt-5/qstring.html where you will find https://doc.qt.io/qt-5/qstring.html#toStdString

russjohn834

Thank you @jsulm. That got solved

J.Hilk

@russjohn834
Great!

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