$--TTM,xx,x.x,x.x,a,x.x,x.x,a,x.x,x.x,a,c--c,a,a,hhmmss.ss,a*hh<CR><LF> 请使用QT按照TTM语句进行解析代码

好的，以下是一个基于Qt的TTM语句解析代码示例：

#include <QByteArray>
#include <QDebug>

// 解析TTM语句
void parseTTM(const QByteArray& sentence)
{
    // 首先判断语句是否合法
    if (sentence.size() < 21 || sentence[0] != '$' || sentence[6] != ',' || sentence[13] != ',' || sentence[20] != '*')
    {
        qDebug() << "Invalid TTM sentence: " << sentence;
        return;
    }

    // 解析经纬度信息
    double lat = 0.0;
    if (sentence[7] == 'N')
    {
        lat = sentence.mid(8, 7).toDouble() / 60.0;
    }
    else if (sentence[7] == 'S')
    {
        lat = -1.0 * sentence.mid(8, 7).toDouble() / 60.0;
    }
    else
    {
        qDebug() << "Invalid TTM sentence: " << sentence;
        return;
    }

    double lon = 0.0;
    if (sentence[15] == 'E')
    {
        lon = sentence.mid(16, 8).toDouble() / 60.0;
    }
    else if (sentence[15] == 'W')
    {
        lon = -1.0 * sentence.mid(16, 8).toDouble() / 60.0;
    }
    else
    {
        qDebug() << "Invalid TTM sentence: " << sentence;
        return;
    }

    // 解析船头向信息
    double heading = sentence.mid(28, 5).toDouble();

    // 解析时间信息
    QByteArray timeData = sentence.mid(31, 9);
    int hour = timeData.mid(0, 2).toInt();
    int minute = timeData.mid(2, 2).toInt();
    int second = timeData.mid(4, 2).toInt();
    qDebug() << "Time: " << hour << ":" << minute << ":" << second;

    // 解析校验和
    QByteArray checksumData = sentence.mid(21, 2);
    int calculatedChecksum = 0;
    for (int i = 1; i < sentence.size() - 3; i++)
    {
        calculatedChecksum ^= sentence[i];
    }
    int checksum = checksumData.toInt(nullptr, 16);
    if (calculatedChecksum != checksum)
    {
        qDebug() << "Invalid TTM sentence: " << sentence;
        return;
    }

    // 打印解析结果
    qDebug() << "Latitude: " << lat;
    qDebug() << "Longitude: " << lon;
    qDebug() << "Heading: " << heading;
}

int main()
{
    // 假设接收到的TTM语句为以下字符串
    QByteArray sentence = "$--TTM,xx,x.x,x.x,a,x.x,x.x,a,x.x,x.x,a,c--c,a,a,125912.00,a*1D\r\n";
    parseTTM(sentence);
    return 0;
}

这段代码解析了TTM语句中的经纬度信息、船头向信息和时间信息，并且进行了校验和的验证。其中，经纬度信息和船头向信息的解析比较简单，直接根据协议文档中的定义进行即可。时间信息可以使用Qt中的QTime类进行解析。校验和的计算可以使用异或运算。