文件可读但以二进制模式保存

Question

我写了一个非常简单的函数，在qt的支持下以二进制方式保存一个文件。文件保存正确，里面的数据也正确，但是如果我用文本编辑器打开文件，我可以读取我不应该读取的字符串。

void Game::saveRanking() const
{
    QFile file(".ranking.dat");
    file.open(QFile::WriteOnly);

    QJsonObject recordObject;

    QJsonArray rankingNameArray;
    for (int i = 0; i < 5; i++)
        rankingNameArray.push_back(QJsonValue::fromVariant(QVariant(highscoreName[i])));
    recordObject.insert("Ranking Name", rankingNameArray);

    QJsonArray rankingScoreArray;
    for (int i = 0; i < 5; i++)
        rankingScoreArray.push_back(QJsonValue::fromVariant(QVariant(highscoreValue[i])));
    recordObject.insert("Ranking Value", rankingScoreArray);

    QJsonDocument doc(recordObject);
    file.write(doc.toBinaryData());
}

为了调试目的，我已经像这样填充了数组

highscoreName[0] = "Pippo"; highscoreValue[0] = 100;
highscoreName[1] = "Franco"; highscoreValue[1] = 300;
highscoreName[2] = "Giovanni"; highscoreValue[2] = 200;
highscoreName[3] = "Andrea"; highscoreValue[3] = 4000;
highscoreName[4] = "AI"; highscoreValue[4] = 132400;

我试着做一个hexdump，结果如下

0000-0010:  71 62 6a 73-01 00 00 00-a4 00 00 00-05 00 00 00  qbjs.... ........
0000-0020:  9c 00 00 00-14 04 00 00-0c 00 52 61-6e 6b 69 6e  ........ ..Rankin
0000-0030:  67 20 4e 61-6d 65 00 00-48 00 00 00-0a 00 00 00  g.Name.. H.......
0000-0040:  34 00 00 00-05 00 50 69-70 70 6f 00-06 00 46 72  4.....Pi ppo...Fr
0000-0050:  61 6e 63 6f-08 00 47 69-6f 76 61 6e-6e 69 00 00  anco..Gi ovanni..
0000-0060:  06 00 41 6e-64 72 65 61-02 00 41 49-8b 01 00 00  ..Andrea ..AI....
0000-0070:  8b 02 00 00-8b 03 00 00-0b 05 00 00-0b 06 00 00  ........ ........
0000-0080:  94 0f 00 00-0d 00 52 61-6e 6b 69 6e-67 20 56 61  ......Ra nking.Va
0000-0090:  6c 75 65 00-20 00 00 00-0a 00 00 00-0c 00 00 00  lue..... ........
0000-00a0:  8a 0c 00 00-8a 25 00 00-0a 19 00 00-0a f4 01 00  .....%.. ........
0000-00ac:  0a a6 40 00-0c 00 00 00-68 00 00 00              ..@..... h...

Answer 1

toBinaryData()给出了内部表示数据，而不是文本，所以文件中有二进制数据是正常的。

QByteArray QJsonDocument::toBinaryData() const

来自文档：

Returns a binary representation of the document.

它也被弃用了：

This function is obsolete. It is provided to keep old source code working. We strongly advise against using it in new code.

你应该使用 toJson().

文件可读但以二进制模式保存

File readable but saved in binary mode

c++

c++11

qt5