QTcpSocket发送结构体

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);
     }
 }

同时使用QBytearray的data函数转换成字符串形式。

然后用memcpy进行复制和转换。

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或许还可以这样，没试过：把结构体转换成一个QString型的就可以write了，然后就可以了。
用QString：：fromascii（）去转换吧，或者是QString：：fromlocal8bit（）去转换