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 <QDebug> 4 #include "sensordata.h" 5 #include <cstring> 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