写一个以0x02为功能码的modbustcp的请求组包使用qt编写

以下是一个简单的以0x02为功能码的Modbus TCP请求组包的示例代码，使用Qt编写：

// Code by QianMo(QianMoWorks.GitHub.io) 
// Modbus TCP Request Packet Generation (Function Code 0x02)

#include <QtNetwork>

void generateModbusTCPRequestPacket()
{
    // Modbus TCP Packet Fields
    const quint16 transactionIdentifier = 0xABCD;
    const quint16 protocolIdentifier = 0x0000;
    const quint16 length = 0x0006;
    const quint8 unitIdentifier = 0x01;
    const quint8 functionCode = 0x02;
    const quint16 startingAddress = 0x0000;
    const quint16 quantityOfCoils = 0x0008;

    // Modbus TCP Packet Data
    QByteArray packetData;
    QDataStream dataStream(&packetData, QIODevice::WriteOnly);
    dataStream.setByteOrder(QDataStream::BigEndian);
    dataStream << startingAddress << quantityOfCoils;

    // Modbus TCP Packet
    QByteArray packet;
    QDataStream packetStream(&packet, QIODevice::WriteOnly);
    packetStream.setByteOrder(QDataStream::BigEndian);
    packetStream << transactionIdentifier << protocolIdentifier << length << unitIdentifier << functionCode << packetData;

    // Output Packet Data (Hexadecimal)
    qDebug() << packet.toHex();
}

这个示例代码生成了一个包含了 Modbus TCP 请求的数据包，请求的功能码为 0x02，读取了起始地址为 0x0000，长度为 0x0008 的线圈状态。你可以根据需要修改这些值。生成的数据包以十六进制格式输出到控制台。