原文：https://blog.csdn.net/uyy203/article/details/54960276

在Qt上建立Tcp server 和 client 間的簡易通訊蝴乔，實(shí)現(xiàn)效果如下

image.png

首先要記得在工程目錄中的pro文件中 加入 傲醉，這樣才能開啟網(wǎng)絡(luò)服務(wù)

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();
 
     /**信號與槽**/
 
    //newConnection()用于當(dāng)有客戶端訪問時發(fā)出信號，acceptConnection()信號處理函數(shù)
    connect(tcpServer,SIGNAL(newConnection()),this,SLOT(acceptConnection()));
 
    //當(dāng)tcpSocket在接受客戶端連接時出現(xiàn)錯誤時另锋，displayError(QAbstractSocket::SocketError)進(jìn)行錯誤提醒并關(guān)閉tcpSocket总处。
    connect(tcpSocket,SIGNAL(error(QAbstractSocket::SocketError)),SLOT(displayError(QAbstractSocket::SocketError)));
 
}
 
 
    //監(jiān)聽是否有客戶端來訪狈惫，且對任何來訪者監(jiān)聽，端口為6666
void 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;
}
 
//點(diǎn)擊發(fā)送按鈕發(fā)送消息
void TcpServerWindow::on_SendBtn_clicked()
{
    //以utf-8字符集格式發(fā)送鹦马，支持中文
    tcpSocket->write(ui->SendText->text().toUtf8());
 
    //以拉丁字符集格式發(fā)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_OBJECT
 
public:
    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();
 
    /**信號與槽**/
 
    //readyRead()表示服務(wù)端發(fā)送數(shù)據(jù)過來即發(fā)動信號胧谈，接著revData()進(jìn)行處理。
    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);
}
 
//新建連接
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_OBJECT
 
public:
    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();
 
     /**信號與槽**/
 
    //newConnection()用于當(dāng)有客戶端訪問時發(fā)出信號荸频，acceptConnection()信號處理函數(shù)
    connect(tcpServer,SIGNAL(newConnection()),this,SLOT(acceptConnection()));
 
    //當(dāng)tcpSocket在接受客戶端連接時出現(xiàn)錯誤時菱肖，displayError(QAbstractSocket::SocketError)進(jìn)行錯誤提醒并關(guān)閉tcpSocket。
    connect(tcpSocket,SIGNAL(error(QAbstractSocket::SocketError)),SLOT(displayError(QAbstractSocket::SocketError)));
 
}
 
 
    //監(jiān)聽是否有客戶端來訪旭从，且對任何來訪者監(jiān)聽稳强，端口為6666
void 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;
}
 
//點(diǎn)擊發(fā)送按鈕發(fā)送消息
void TcpServerWindow::on_SendBtn_clicked()
{
    //以utf-8字符集格式發(fā)送，支持中文
    tcpSocket->write(ui->SendText->text().toUtf8());
 
    //以拉丁字符集格式發(fā)送
//    tcpSocket->write(ui->SendText->text().toLatin1());
}