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

1 #include "mainwindow.h" 2 #include "ui_mainwindow.h" 3 #include 
     
       4 #include "sensordata.h" 5 #include 
      
        6  7 MainWindow::MainWindow(QWidget *parent) : 8     QMainWindow(parent), 9     ui(new Ui::MainWindow)10 {11     ui->setupUi(this);12 13     mySocket = new QTcpSocket();14     QObject::connect(mySocket, &QTcpSocket::readyRead, this, &MainWindow::MySocketReadData);15     QObject::connect(mySocket, &QTcpSocket::disconnected, this, &MainWindow::MySocketDisconnected);16 17     ui->btnSend->setEnabled(false);18     ui->lineEdit_IP->setText("127.0.0.1");19     ui->lineEdit_Port->setText("5000");20 }21 22 MainWindow::~MainWindow()23 {24     delete mySocket;25     delete ui;26 }27 28 void MainWindow::MySocketReadData()29 {30     QByteArray buffer;31 32     buffer = mySocket->readAll();33     struct NetDataBase_t myData;34     if(!buffer.isEmpty()) {35         char *src = buffer.data();36         memcpy(&myData, src, sizeof(struct NetDataBase_t));37         ui->textEdit_Recv->setText(QString("hValue:%1,lValue%2,temp:%3")38                 .arg(QString::number(myData.hValue, 'g', 12))39                 .arg(QString::number(myData.lValue, 'g', 12)).arg(myData.temperature));40     }41 }42 43 void MainWindow::MySocketDisconnected()44 {45     ui->btnSend->setEnabled(false);46 47     ui->btnConnect->setText("连接");48     qDebug()<<"Disconnected!";49 }50 51 void MainWindow::on_btnSend_clicked()52 {53     struct NetDataBase_t myData;54     myData.dataHeader.nDataSize = 1;55     myData.dataHeader.nDataSize = sizeof(struct NetDataBase_t) - sizeof(struct NetDataHeader_t);56     myData.hValue = -1.234567890;57     myData.lValue = 0.123456789;58     myData.temperature = 23.1;59 60     QByteArray data;61     data.resize(sizeof(struct NetDataBase_t));62     memcpy(data.data(), &myData, sizeof(struct NetDataBase_t));63 64     mySocket->write(data);65     mySocket->flush();66 }67 68 void MainWindow::on_btnConnect_clicked()69 {70     if(ui->btnConnect->text() == tr("连接")) {71         QString ip;72         int port;73         ip = ui->lineEdit_IP->text();74         port = ui->lineEdit_Port->text().toInt();75 76         mySocket->abort();77         mySocket->connectToHost(ip, port);78         if(!mySocket->waitForConnected(30000)) {79             qDebug()<<"Connection failed!";80             return;81         }82         qDebug()<<"Connect successfully!";83 84         ui->btnSend->setEnabled(true);85         ui->btnConnect->setText("断开连接");86     } else {87         mySocket->disconnectFromHost();88         ui->btnConnect->setText("连接");89         ui->btnSend->setEnabled(false);90     }91 }
      
     

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