With QT C++ what are the ways to convert between an ascii integer and a string in both directions

[AI_Messiah]

I am not talking about numbers I mean the actual ascii values. I have tried to do this:

string chr(int a)
{
     string b;
     b = char(a);
     return b;
}

and this:

apart = part.toStdString()[0];
val = int(apart)

I get this error:

mainwindow.obj:-1: error: LNK2019: unresolved external symbol "private: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl MainWindow::chr(int)" (?chr@MainWindow@@AEAA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@H@Z) referenced in function "public: __cdecl MainWindow::MainWindow(class QWidget *)" (??0MainWindow@@QEAA@PEAVQWidget@@@Z)

and

C:\Users\damon\Documents\QT\build-markov-Desktop_Qt_6_1_1_MSVC2019_64bit-Debug\debug\markov.exe:-1: error: LNK1120: 1 unresolved externals

I hate these error codes the most because they make the least amount of sense, but anyway?

[sierdzio]

@AI_Messiah said in With QT C++ what are the ways to convert between an ascii integer and a string in both directions:

unresolved external symbol

Your chr() is defined in header file as method of MainWindow, right? But in source file, you did not define it - it should read:

string MainWindow::chr(int a)

numbers I mean the actual ascii values

But they are the same! ASCII table is just a bunch of numbers. Anyway, if you have an ASCII code, like 'A' or 65, you can do this:

const QString myCharacter(QChar(65));
qDebug() << myCharacter;

And to go the other way:

qDebug() << int(myCharacter.toLatin1().at(0));;