QTcpSocket发送结构体

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我需要发送的结构体

struct NetDataHeader_t {

    int nDataType;

    int nDataSize;

};

struct NetDataBase_t {

    NetDataHeader_t dataHeader;

    double hValue;

    double lValue;

    double temperature;

};

我的运行函数

 #include "mainwindow.h"

 #include "ui_mainwindow.h"

 #include <QDebug>

 #include "sensordata.h"

 #include <cstring>

 MainWindow::MainWindow(QWidget *parent) :

     QMainWindow(parent),

     ui(new Ui::MainWindow)

 {

     ui->setupUi(this);

     mySocket = new QTcpSocket();

     QObject::connect(mySocket, &QTcpSocket::readyRead, this, &MainWindow::MySocketReadData);

     QObject::connect(mySocket, &QTcpSocket::disconnected, this, &MainWindow::MySocketDisconnected);

     ui->btnSend->setEnabled(false);

     ui->lineEdit_IP->setText("127.0.0.1");

     ui->lineEdit_Port->setText("");

 }

 MainWindow::~MainWindow()

 {

     delete mySocket;

     delete ui;

 }

 void MainWindow::MySocketReadData()

 {

     QByteArray buffer;

     buffer = mySocket->readAll();

     struct NetDataBase_t myData;

     if(!buffer.isEmpty()) {

         char *src = buffer.data();

         memcpy(&myData, src, sizeof(struct NetDataBase_t));

         ui->textEdit_Recv->setText(QString("hValue:%1,lValue%2,temp:%3")

                 .arg(QString::number(myData.hValue, 'g', ))

                 .arg(QString::number(myData.lValue, 'g', )).arg(myData.temperature));

     }

 }

 void MainWindow::MySocketDisconnected()

 {

     ui->btnSend->setEnabled(false);

     ui->btnConnect->setText("连接");

     qDebug()<<"Disconnected!";

 }

 void MainWindow::on_btnSend_clicked()

 {

     struct NetDataBase_t myData;

     myData.dataHeader.nDataSize = ;

     myData.dataHeader.nDataSize = sizeof(struct NetDataBase_t) - sizeof(struct NetDataHeader_t);

     myData.hValue = -1.234567890;

     myData.lValue = 0.123456789;

     myData.temperature = 23.1;

     QByteArray data;

     data.resize(sizeof(struct NetDataBase_t));

     memcpy(data.data(), &myData, sizeof(struct NetDataBase_t));

     mySocket->write(data);

     mySocket->flush();

 }

 void MainWindow::on_btnConnect_clicked()

 {

     if(ui->btnConnect->text() == tr("连接")) {

         QString ip;

         int port;

         ip = ui->lineEdit_IP->text();

         port = ui->lineEdit_Port->text().toInt();

         mySocket->abort();

         mySocket->connectToHost(ip, port);

         if(!mySocket->waitForConnected()) {

             qDebug()<<"Connection failed!";

             return;

         }

         qDebug()<<"Connect successfully!";

         ui->btnSend->setEnabled(true);

         ui->btnConnect->setText("断开连接");

     } else {

         mySocket->disconnectFromHost();

         ui->btnConnect->setText("连接");

         ui->btnSend->setEnabled(false);

     }

 }