QDateTime to a file (Invalid operands to binary expression ('std::fstream' (aka 'basic_fstream<char>') and 'QDateTime')

Tasha

Hi there, I have a QdateTime and I'm trying to add it into a file, but I cannot because it contains Strings and Ints, so converting it to either or gives me an error: (Invalid operands to binary expression ('std::fstream' (aka 'basic_fstream<char>') and 'QDateTime')

My code below:

  std::vector<Visitor> visitorsList;
          Visitor *visitor = new Visitor();
                 visitor->setFirstName(ui->lineEditFirstNameIn->text());
                 visitor->setLastName(ui->lineEditLastNameIn->text());
                 visitor->setContact(ui->lineEditContact->text());
                 visitor->setPhone(ui->lineEditPhone->text());
// ------------------ Relevant code ------------------
                 visitor->setTimeIn(QDateTime::currentDateTime());
// ------------------ Relevant code end ------------------

                 visitorsList.push_back(*visitor);

                 std::fstream dataFile;
                 dataFile.open("data.txt", std::ios::app);
                 //Append visitorList vector  to file
                 for (size_t i = 0; i < visitorsList.size(); i++) 
{
                     dataFile << visitorsList[i].getFirstName().toStdString() << ", " << visitorsList[i].getLastName().toStdString()  << ", " << visitorsList[i].getContact().toStdString()  << ", " << visitorsList[i].getPhone().toStdString();

// ------------------ Relevant code ------------------
             dataFile << visitorsList[i].getTimeIn()<< std::endl;
// ------------------ Relevant code end ------------------
 }
                 dataFile.close();```

Note: all the other visitorList[i].getXXX works just fine and is added to the data.txt file.

Christian Ehrlicher

@Tasha said in QDateTime to a file (Invalid operands to binary expression ('std::fstream' (aka 'basic_fstream<char>') and 'QDateTime'):

Hi there, I have a QdateTime and I'm trying to add it into a file,

Convert it to a QString and then to a std::string.

Tasha

@Christian-Ehrlicher
Hey ! Thank you so much for the help. Unfortunately, it only half works. The error is now gone, but it pops up with this instead:

Expected ; before visitorsList (this error goes away if I add a ';' before getTimeIn.toString().toStdString but isn't useful because I need the getTimeIn )

and

Reference to overloaded function, did you mean to call it?

 dataFile << visitorsList[i].getFirstName().toStdString() << ", " << visitorsList[i].getLastName().toStdString()  << ", " << visitorsList[i].getContact().toStdString()  << ", " << visitorsList[i].getPhone().toStdString() << + " ";  visitorsList[i].getTimeIn().toString().toStdString() << std::endl;

JonB

@Tasha said in QDateTime to a file (Invalid operands to binary expression ('std::fstream' (aka 'basic_fstream<char>') and 'QDateTime'):

<< + " ";

Sort this bit out in your statement.