对文件进行加密

以二进制流 写入加密二进制串+Image = 新文件

解密时  读取同样长度的二进制+Image  即可解密

同时保存Image时要注意文件头问题，不能直接以二进制流写入！

不同格式的文件有着不同的文件头！

新文件，新思维

 

void MainWindow::on_pushButton_clicked()

{

    QStringList files = QFileDialog::getOpenFileNames(this,QDir::currentPath(),"","Images (*.png *.bmp *.jpg)");

    foreach (QString filename, files) {

        qDebug()<<filename;

        QImage pImage(filename);

        QFile writefile(filename+".my");

        writefile.open(QIODevice::WriteOnly);

        QDataStream data(&writefile);

        data << (quint32)0xA0B0C0D0<<pImage;

        qDebug()<< writefile.size();

        writefile.flush();

    }

    ui->label->setText("Encryption success");

}

//

void MainWindow::on_pushButton_2_clicked()

{

    QStringList files = QFileDialog::getOpenFileNames(this,QDir::currentPath(),"","*.my");

    foreach (QString filename, files) {

        qDebug()<<filename;

        QImage pImage;

        quint32 n;

        QFile readfile(filename);

        readfile.open(QIODevice::ReadOnly);

        QDataStream data(&readfile);

        data>> n >>pImage;

        pImage.save(filename+".jpg");

        ui->label->setText("Decryption  is runing ");

    }

ui->label->setText("Decryption success");

}