TCP通信软件
软件功能描述实现步骤创建工程添加clientui设计控制程序
界面展示

软件功能描述

（1）TCP server 实现根据 “IP地址” 和 “端口号” 开启服务器，监听连接，收发数据功能。
（2）TCP client 实现根据 “IP地址” 和 “端口号” 连接服务器，收发数据功能。

目前只实现了一对一通信，只能有一个client，可通过动态创建socket的方式实现多个client。

实现步骤
创建工程

开发环境：Qt Creator 5.12.8 qt-opensource-windows-x86-5.12.8
下图中没展示的步骤使用默认设置即可。

添加client

现在就有了两个ui

ui设计

Server 界面：

Client界面：

控制程序

TCP.pro

QT       += core gui network

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
CONFIG += c++11
# The following define makes your compiler emit warnings if you use

# any Qt feature that has been marked deprecated (the exact warnings

# depend on your compiler). Please consult the documentation of the

# deprecated API in order to know how to port your code away from it.

DEFINES += QT_DEPRECATED_WARNINGS
# You can also make your code fail to compile if it uses deprecated APIs.

# In order to do so, uncomment the following line.

# You can also select to disable deprecated APIs only up to a certain version of Qt.

#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
SOURCES += \

    client.cpp \

    main.cpp \

    server.cpp
HEADERS += \

    client.h \

    server.h
FORMS += \

    client.ui \

    server.ui
CONFIG += c++11
# Default rules for deployment.

qnx: target.path = /tmp/$${TARGET}/bin

else: unix:!android: target.path = /opt/$${TARGET}/bin

!isEmpty(target.path): INSTALLS += target
 
client.h
#ifndef CLIENT_H

#define CLIENT_H

#include <QWidget>

#include <QTcpServer>

#include <QTcpSocket>
namespace Ui {

class Client;

}
class Client : public QWidget

{

    Q_OBJECT
public:

    explicit Client(QWidget *parent = nullptr);

    ~Client();
private:

    Ui::Client *ui;

    //QTcpServer* server;//监听的套接字

    QTcpSocket* client;//通信的套接字

};
#endif // CLIENT_H
 
server.h
#ifndef SERVER_H

#define SERVER_H

#include <QWidget>

#include <QTcpServer>

#include <QTcpSocket>
QT_BEGIN_NAMESPACE

namespace Ui { class Server; }

QT_END_NAMESPACE
class Server : public QWidget

{

    Q_OBJECT
public:

    Server(QWidget *parent = nullptr);

    ~Server();
private:

    Ui::Server *ui;

    QTcpServer* server;//监听的套接字

    QTcpSocket* conn;//通信的套接字

};

#endif // SERVER_H
 
client.cpp
#include "client.h"

#include "ui_client.h"

Client::Client(QWidget *parent) :

    QWidget(parent),

    ui(new Ui::Client)

{

    ui->setupUi(this);
    //ui init

    ui->IP->setText("192.168.50.116");

    ui->PORT->setText("12321");

    ui->state->setText("状态：未连接");
    connect(ui->Connect, &QPushButton::clicked, this, [=]()

    {

        // init

        client = new QTcpSocket(this);

        //连接服务器

        client->connectToHost(QHostAddress(ui->IP->text()),ui->PORT->text().toInt());

        ui->state->setText("状态：已连接");

        ui->record->append("已连接到服务器---IP：" + ui->IP->text() + "  端口：" + ui->PORT->text());
        //接收数据

        connect(client, &QTcpSocket::readyRead, this, [=]()

        {

            QByteArray array = client->readAll();

            ui->record->append("Server: " + array);

        });

        //发送

        connect(ui->send, &QPushButton::clicked, this, [=]()

        {

            //发送数据

            client->write(ui->msg->toPlainText().toUtf8());

            ui->record->append("Client: " + ui->msg->toPlainText());

            //clear

            //ui->textEdit_2->clear();

        });
    });

}
Client::~Client()

{

    delete ui;

}
 
server.cpp
#include "server.h"

#include "ui_server.h"

Server::Server(QWidget *parent)

    : QWidget(parent)

    , ui(new Ui::Server)

{

    ui->setupUi(this);
    //ui init

    ui->IP->setText("192.168.50.116");

    ui->PORT->setText("12321");

    ui->state->setText("状态：未开启");
    connect(ui->OpenServer, &QPushButton::clicked, this, [=]()

    {

        //实例化

        server = new QTcpServer(this);

        //监听

        server->listen(QHostAddress(ui->IP->text()),ui->PORT->text().toInt());

        ui->state->setText("状态：已开启");
        //新的连接

        connect(server, &QTcpServer::newConnection, this, [=]()

        {

            //接收客户端的套接字对象accept

            // sock_addr 结构体 == 类 QTcpSocket

            conn = server->nextPendingConnection();

            QString str;

            ui->record->append("客户端接入---IP: " + conn->peerAddress().toString() +"  端口："+ str.sprintf("%d", (conn->peerPort())));
            //接收数据

            connect(conn, &QTcpSocket::readyRead, this, [=]()

            {

                QByteArray array = conn->readAll();

                ui->record->append("Client: " + array);

            });
        });
        //发送

        connect(ui->send, &QPushButton::clicked, this, [=]()

        {

            //发送数据

            conn->write(ui->msg->toPlainText().toUtf8());

            //char data[1024];data[0]=0xeb;data[1]=0x90;

            //conn->write(data,1024);

            ui->record->append("Server: " + ui->msg->toPlainText());

            //clear

            //ui->textEdit_2->clear();

        });

    });
}
Server::~Server()

{

    delete ui;

}
 
main.cpp
#include "server.h"

#include "client.h"

#include <QApplication>

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    Server w;

    w.setWindowTitle("TCP Server");

    w.show();
    Client c;

    c.setWindowTitle("TCP Client");

    c.show();
    return a.exec();

}


界面展示 

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