Qt TCP通讯简易Demo

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在Qt上建立Tcp server 和 client 间的简易通讯，实现效果如下

首先要记得在工程目录中的pro文件中加入，这样才能开启网络服务

QT       += network

//mainwindow.h

#include "tcpserverwindow.h"#include "ui_tcpserverwindow.h"TcpServerWindow::TcpServerWindow(QWidget *parent) :    QDialog(parent),    ui(new Ui::TcpServerWindow){    ui->setupUi(this);    tcpSocket=new QTcpSocket(this);    tcpServer=new QTcpServer(this);    setListener();     /**信号与槽**/    //newConnection()用于当有客户端访问时发出信号，acceptConnection()信号处理函数    connect(tcpServer,SIGNAL(newConnection()),this,SLOT(acceptConnection()));    //当tcpSocket在接受客户端连接时出现错误时，displayError(QAbstractSocket::SocketError)进行错误提醒并关闭tcpSocket。    connect(tcpSocket,SIGNAL(error(QAbstractSocket::SocketError)),SLOT(displayError(QAbstractSocket::SocketError)));}    //监听是否有客户端来访，且对任何来访者监听，端口为6666void TcpServerWindow::setListener(){    if(!tcpServer->listen(QHostAddress::Any,6666)){         qDebug()<<tcpServer->errorString();        close();    }else {        qDebug()<<"listening";    }}void TcpServerWindow::displayError(QAbstractSocket::SocketError){   qDebug()<<tcpSocket->errorString();   tcpSocket->close();}void TcpServerWindow::acceptConnection(){    tcpSocket=tcpServer->nextPendingConnection();}TcpServerWindow::~TcpServerWindow(){    delete ui;}//点击发送按钮发送消息void TcpServerWindow::on_SendBtn_clicked(){    //以utf-8字符集格式发送，支持中文    tcpSocket->write(ui->SendText->text().toUtf8());    //以拉丁字符集格式发送//    tcpSocket->write(ui->SendText->text().toLatin1());}

//mainwindow.cpp

#include "mainwindow.h"#include "ui_mainwindow.h"MainWindow::MainWindow(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::MainWindow){    ui->setupUi(this);    tcpServerWindow=new TcpServerWindow;    tcpClientWindow=new TcpClientWindow;}MainWindow::~MainWindow(){    delete ui;}void MainWindow::on_server_clicked(){    tcpServerWindow->show();}void MainWindow::on_client_clicked(){    tcpClientWindow->show();}

*************Client***************

//tcpclientwindow.h

#ifndef TCPCLIENTWINDOW_H#define TCPCLIENTWINDOW_H#include<QtNetwork/QTcpSocket>#include<QtNetwork>#include <QDialog>namespace Ui {class TcpClientWindow;}class TcpClientWindow : public QDialog{    Q_OBJECTpublic:    explicit TcpClientWindow(QWidget *parent = 0);    ~TcpClientWindow();private:    Ui::TcpClientWindow *ui;    QTcpSocket *tcpSocket;    void newTcpConnection();private slots:    void displayError(QAbstractSocket::SocketError);    void revData();};#endif // TCPCLIENTWINDOW_H

//tcpclientwindow.cpp

#include "tcpclientwindow.h"#include "ui_tcpclientwindow.h"TcpClientWindow::TcpClientWindow(QWidget *parent) :    QDialog(parent),    ui(new Ui::TcpClientWindow){    ui->setupUi(this);    tcpSocket=new QTcpSocket(this);    newTcpConnection();    /**信号与槽**/    //readyRead()表示服务端发送数据过来即发动信号，接着revData()进行处理。    connect(tcpSocket,SIGNAL(readyRead()),this,SLOT(revData()));    connect(tcpSocket,SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(displayError(QAbstractSocket::SocketError)));}    //接收字符串void TcpClientWindow::revData(){    QString data=tcpSocket->readAll();    ui->ReceiveText->setText(data);}//新建连接void TcpClientWindow::newTcpConnection(){    tcpSocket->abort();    tcpSocket->connectToHost("127.0.0.1",6666);    }void TcpClientWindow::displayError(QAbstractSocket::SocketError){    qDebug()<<tcpSocket->errorString();    tcpSocket->close();}TcpClientWindow::~TcpClientWindow(){    delete ui;}

***************Server***************

//tcpserverwindow.h

#ifndef TCPSERVERWINDOW_H#define TCPSERVERWINDOW_H#include<QtNetwork/QTcpSocket>#include<QtNetwork/QTcpServer>#include <QDialog>namespace Ui {class TcpServerWindow;}class TcpServerWindow : public QDialog{    Q_OBJECTpublic:    explicit TcpServerWindow(QWidget *parent = 0);    ~TcpServerWindow();private:    Ui::TcpServerWindow *ui;    QTcpSocket *tcpSocket;    QTcpServer *tcpServer;    void setListener();private slots:    void acceptConnection();    void displayError(QAbstractSocket::SocketError);    void on_SendBtn_clicked();};#endif // TCPSERVERWINDOW_H

//tcpserverwindow.cpp

#include "tcpserverwindow.h"#include "ui_tcpserverwindow.h"TcpServerWindow::TcpServerWindow(QWidget *parent) :    QDialog(parent),    ui(new Ui::TcpServerWindow){    ui->setupUi(this);    tcpSocket=new QTcpSocket(this);    tcpServer=new QTcpServer(this);    setListener();     /**信号与槽**/    //newConnection()用于当有客户端访问时发出信号，acceptConnection()信号处理函数    connect(tcpServer,SIGNAL(newConnection()),this,SLOT(acceptConnection()));    //当tcpSocket在接受客户端连接时出现错误时，displayError(QAbstractSocket::SocketError)进行错误提醒并关闭tcpSocket。    connect(tcpSocket,SIGNAL(error(QAbstractSocket::SocketError)),SLOT(displayError(QAbstractSocket::SocketError)));}    //监听是否有客户端来访，且对任何来访者监听，端口为6666void TcpServerWindow::setListener(){    if(!tcpServer->listen(QHostAddress::Any,6666)){         qDebug()<<tcpServer->errorString();        close();    }else {        qDebug()<<"listening";    }}void TcpServerWindow::displayError(QAbstractSocket::SocketError){   qDebug()<<tcpSocket->errorString();   tcpSocket->close();}void TcpServerWindow::acceptConnection(){    tcpSocket=tcpServer->nextPendingConnection();}TcpServerWindow::~TcpServerWindow(){    delete ui;}//点击发送按钮发送消息void TcpServerWindow::on_SendBtn_clicked(){    //以utf-8字符集格式发送，支持中文    tcpSocket->write(ui->SendText->text().toUtf8());    //以拉丁字符集格式发送//    tcpSocket->write(ui->SendText->text().toLatin1());}

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