QT读取写入二进制文件

读写二进制文件

需要的头文件

#include <QMessageBox>
#include <QString>
#include <QPixmap>
#include <QFile>
#include <QDataStream>

写二进制文件

bool write_file(const QString &filename)
{
    QFile file(filename);
    if(!file.open(QIODevice::WriteOnly))
        {
        QMessageBox::warning(this,tr("My App"),tr("Cannot write file %1:\n%2 .").arg(file.fileName()).arg(file.errorString()));
        return false;
    }

    QDataStream out(&file);
    out.setVersion(QDataStream::Qt_5_7);

    out << qint32(0x1234abcd);

    QApplication::setOverrideCursor(Qt::WaitCursor);

    for (int i;i<100;i++)
        out << quint16(i);

    QApplication::setOverrideCursor(Qt::ArrowCursor);
    return true;
}

读二进制文件

bool read_file(const QString &filename)
{
    QFile file(filename);
    if(!file.open(QIODevice::ReadOnly))
        {
        QMessageBox::warning(this,tr("My App"),tr("Cannot read file %1:\n%2.").arg(file.fileName()).arg(file.errorString()));
        return false;
    }

    QDataStream in(&file);
    in.setVersion(QDataStream::Qt_5_7);

    //in << qint32(0x1234abcd);
    qint32 magic;
    in >> magic;

    if (magic != 0x1234abcd)
    {
        QMessageBox::warning(this,tr("My App"),tr("This is not a correct file"));
        return false;
    }

    QApplication::setOverrideCursor(Qt::WaitCursor);

    quint16 temp;

    while (!in.atEnd()) {
        in >> temp;
        ui->textEdit->setText(QString("%1").arg(temp));
    }

    QApplication::setOverrideCursor(Qt::ArrowCursor);
    return true;
}