File IO Between QFile And std fstream

The article show demoes about use ifstream to read file written by qfile and use qfile to read file written by ofstream.

Use ifstream to read file written by QFile

#include <QCoreApplication>
#include <QString>
#include <QFile>
#include <iostream>
#include <fstream>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QString path = "test.txt";
    QFile writeFile(path);
    writeFile.open(QIODevice::WriteOnly);
    if (writeFile.isOpen())
    {
        int version = 6;
        writeFile.write((char*)&version, sizeof(int));

        char str[10] = "hello~";
        writeFile.write(str, sizeof(str));

        writeFile.close();
    }

    std::ifstream iStream;
    iStream.open(path.toLocal8Bit().data(), std::ios::binary);
    if( iStream.is_open() )
    {
        int version = -1;
        iStream.read((char*)&version, sizeof(version));

        char str[10] = { 0 };
        iStream.read(str, sizeof(str));

        std::cout << version << " " << str << std::endl;

        iStream.close();
    }
    return a.exec();
}

Output:

6 hello~

Use QFile to read file written by ofstream

#include <QCoreApplication>
#include <QString>
#include <QStringList>
#include <QDebug>
#include <QFile>
#include <iostream>
#include <fstream>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QString path = "test.txt";

    std::ofstream oStream;
    oStream.open(path.toLocal8Bit().data(), std::ios::binary);
    if( oStream.is_open() )
    {
        int version = 6;
        oStream.write((char*)&version, sizeof(version));

        char str[10] = "hello~";
        oStream.write(str, sizeof(str));

        oStream.close();
    }

    QFile readFile(path);
    readFile.open(QIODevice::ReadOnly);
    if (readFile.isOpen())
    {
        int version = -1;
        readFile.read((char*)&version, sizeof(int));

        char str[10] = { 0 };
        readFile.read(str, sizeof(str));

        std::cout << version << " " << str << std::endl;

        readFile.close();
    }

    return a.exec();
}