Qt/C++ - Reading a char from a line

Question

This should be SO easy yet I can't figure it out. I'm doing:

#include <QFile>
#include <QString>
#include <QTextStream>
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <QtCore>
#include <QChar>


QFile filein(filename);
if(filein.open(QFile::ReadWrite | QFile::Text)){
    QTextStream in(&filein);
    QString line = in.readLine();
    _n = QChar::digitValue(line[0]);
    _m = stoi(line[1]);
}

Neither of these work: stoi is not defined , no matter what I include, even though I am using a C++11 compiler, also:

cpp:36: error: no matching function for call to 'QChar::digitValue(QCharRef)'
         _n = QChar::digitValue(line[0]);
                                       ^`

so that doesn't work either. I also tried QChar::unicode() with similar results. What am I missing?

Answer 1

看起来像你想要的

int _n = line[0].digitValue();