c++ - 如何从 QDataStream 中读取数组

Question

我想将存储在 vector (保存结构)中的数据写入文件，并从该文件读取数据。我尝试使用 QDataStream 并重载“>>”和“<<”运算符来执行此操作。一切正常，直到我向结构中添加一个 char 数组。 我尝试从 QDataStream 读取字符串的方式一定有问题。我尝试了不同的方法来读取字符串，但总是出错。

结构如下:

typedef struct
{
   char data[cNetworkMessageLengthMax + 1];   //cNetworkMessageLengthMax=19
} __attribute__((packed)) networkMessageBody_t;


typedef struct 
{
    baseStation_daytime_t   timestamp;
    uint32_t                blueId;
    networkMessageBody_t    message;
} __attribute__((packed)) baseStation_mailbox_t;

和运营商:

QDataStream &operator<<(QDataStream &out, const std::vector<baseStation_mailbox_t> &data)
{
    for(uint8_t i=0; i < data.size(); i++)
    {
        out << data[i].timestamp.time.hour;
        out << data[i].timestamp.time.minute;
        out << data[i].timestamp.time.second;
        out << data[i].timestamp.time.thousandth;
        out << data[i].timestamp.date.day;
        out << data[i].timestamp.date.month;
        out << data[i].timestamp.date.year;

        out << data[i].blueId;

        out << data[i].message.data;
    }
    return out;
}

QDataStream &operator>>(QDataStream &in, std::vector<baseStation_mailbox_t> &data)
{
    uint16_t tmp16;
    uint32_t tmp32;
    char tmpChar[20];

    uint8_t i = 0;
    while(in.atEnd() == false)
    {
        data.emplace_back();

        in >> data[i].timestamp.time.hour;
        in >> data[i].timestamp.time.minute;
        in >> data[i].timestamp.time.second;
        in >> tmp16;
        data[i].timestamp.time.thousandth = tmp16;
        in >> data[i].timestamp.date.day;
        in >> data[i].timestamp.date.month;
        in >> tmp16;
        data[i].timestamp.date.year = tmp16;

        in >> tmp32;
        data[i].blueId = tmp32;

        in >> tmpChar;                 //HERE I get errors
        data[i].message.data = tmpChar;

        i++;
    }

    return in;
    }

Answer 1

替换:

• out << data[i].message.data;与 out << QByteArray::fromRawData(data[i].message.data,std::extent<decltyple(data[i].message.data)>::value);
• char tmpChar[20];与 QByteArray tmpChar;
• data[i].message.data = tmpChar;与 std::copy(tmpChar.constBegin(),tempChar.constEnd(),data[i].message.data);