Qt读写二进制文件

下面是简单的二进制读写示例

#include <QtCore/QCoreApplication>
#include <QFile>
#include <QByteArray>
#include <iostream>
using namespace std;
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QFile file("test.dat");
    file.open(QIODevice::WriteOnly);
    double _a = 13.95;
    int b = 189;
    file.write((char*)&_a, sizeof(_a));
    file.write((char*)&b, sizeof(b));
    file.close();

    QFile tmpfile("test.dat");
    tmpfile.open(QIODevice::ReadOnly);
    double c = 0;
    int d = 0;
    tmpfile.read((char*)&c, sizeof(c));
    tmpfile.read((char*)&d, sizeof(d));
    cout<<c<<' '<<d<<endl;
    //QByteArray bytes = tmpfile.readAll();
    //c = *((double*)bytes.data());
    //d = *((int*)(bytes.data() + sizeof(c)));
    //cout<<c<<' '<<d<<endl;
    tmpfile.close();

    return a.exec();
}