運行截圖如下：

代碼如下：

客戶端：

widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget> #include <QAbstractSocket> class QTcpSocket;namespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();private:Ui::Widget *ui;QString m_message;QTcpSocket *m_tcpSocket;quint16 m_blockSize; //存放數據大小private slots:void newConnect();void readMessage();void displayError(QAbstractSocket::SocketError);void connectBtnClicked();};#endif // WIDGET_H

widget.cpp

#include "widget.h" #include "ui_widget.h" #include <QtNetwork> #include <QDebug>Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget) {ui->setupUi(this);m_tcpSocket=new QTcpSocket(this);connect(m_tcpSocket,&QTcpSocket::readyRead,this,&Widget::readMessage);connect(m_tcpSocket,SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(displayError(QAbstractSocket::SocketError)));connect(ui->connectPushButton,&QPushButton::clicked,this,Widget::connectBtnClicked); }void Widget::newConnect(){m_blockSize=0;m_tcpSocket->abort();m_tcpSocket->connectToHost(ui->hostLineEdit->text(),ui->portLineEdit->text().toInt()); }void Widget::readMessage(){QDataStream in(m_tcpSocket);in.setVersion(QDataStream::Qt_5_7);if(m_blockSize==0){if(m_tcpSocket->bytesAvailable()<(int)sizeof(quint16))return;in>>m_blockSize;}if(m_tcpSocket->bytesAvailable()<m_blockSize) return;in>>m_message;qDebug()<<"message:"<<m_message;ui->listWidget->insertItem(0,m_message); }void Widget::displayError(QAbstractSocket::SocketError){qDebug()<<m_tcpSocket->errorString(); }void Widget::connectBtnClicked(){newConnect(); }Widget::~Widget() {delete ui; }

main.cpp

#include "widget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);Widget w;w.show();return a.exec(); }

服務端：

widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget> class QTcpServer;namespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();private:Ui::Widget *ui;QTcpServer *m_tcpServer;private slots:void sendMessage(); };#endif // WIDGET_H

widget.cpp

#include "widget.h" #include "ui_widget.h" #include <QtNetwork> #include <QDebug>Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget) {ui->setupUi(this);m_tcpServer=new QTcpServer(this);if(!m_tcpServer->listen(QHostAddress::LocalHost,10086)){qDebug()<<m_tcpServer->errorString();close();}connect(m_tcpServer,&QTcpServer::newConnection,this,&Widget::sendMessage); }Widget::~Widget() {delete ui; }void Widget::sendMessage() {QByteArray block;QDataStream out(&block,QIODevice::WriteOnly);out.setVersion(QDataStream::Qt_5_7);out<<(quint16)0;out<<QString::fromUtf8("你妹");out.device()->seek(0);out<<(quint16)(block.size()-sizeof(quint16));QTcpSocket *clientConnection=m_tcpServer->nextPendingConnection();connect(clientConnection,&QTcpSocket::disconnected,clientConnection, &QTcpSocket::deleteLater);clientConnection->write(block);clientConnection->disconnectFromHost();ui->label->setText("發送數據成功"); }

main.cpp

#include "widget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);Widget w;w.show();return a.exec(); }

總結

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