Question

我需要从通过TCP / IP发送的驾驶模拟器中读取速度值。

模拟器的数据包定义如下：

<PacketDefinition> =  ((VariableNames, Datatype, Defaultvalue));

所以我的SendDefinition看起来像这样：

SendDefinition = ((speed, double, 0.0));

驾驶模拟器的文档中告知信息，double的数据长度= 8。

我已经试图读取这样的值：

Socket s = new Socket(server, port);
InputStream is = s.getInputStream();
DataInputStream dis = new DataInputStream(is);
System.out.println(dis.readDouble());

但这给了我胡说八道的价值。

有人可以帮助我阅读正确的值吗？附加信息：驾驶模拟器称为“ SILAB”

Answer 1

也许此C ++代码可以帮助您

Counter

这是我为以下SendDefinition设计的一个例子

void ClusterClientSocket::on_readyRead(){

typedef enum _typeRead{typeRev, typeSpeed, typeSpeedLimit} TypeRead;
static TypeRead nextType = typeRev;

// read recurringly the data from the simulator in the order rev, speed, speed limit
while(m_socket->bytesAvailable() >= sizeof(double)) {
    char buffer[sizeof(double)];
    qint64 size = m_socket->read(buffer, sizeof(double));
    if(size != sizeof(double)) {
        break;
    }

    double value = *(reinterpret_cast<double *>(buffer));
    switch(nextType) {
    case typeRev:
        // qDebug() << "rev: " << value;
        emit revReceived(value);
        nextType = typeSpeed;
        break;
    case typeSpeed:
        //qDebug() << "speed: " << value;
        emit speedReceived(value);
        nextType = typeSpeedLimit;
        break;
    case typeSpeedLimit:
        //qDebug() << "speedLimit: " << value;
        emit speedLimitReceived(value);
        nextType = typeRev;
        break;
    default:
        qDebug() << "unknown value for nextType";
        break;
    }
}}

从TCP / IP连接（JAVA）读取双精度值

1 个答案: