Qt套接字实现TCP通信

环境:

主机:win10

开发环境:Qt

功能:

用TCP进行收发通信

界面:

源代码:

在TCPsocket.pro文件中

#-------------------------------------------------

#

# Project created by QtCreator 2018-03-21T13:40:24

#

#-------------------------------------------------

QT       += core gui

QT       += network

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = TCPsocket

TEMPLATE = app

# The following define makes your compiler emit warnings if you use

# any feature of Qt which as been marked as 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 you use 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 += main.cpp\

        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

在MainWindow.h文件中

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include 

#include 

#include 

#include 

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

     Q_OBJECT

 public:

     explicit MainWindow(QWidget *parent = 0);

     ~MainWindow();

 private slots:

    void sendMassage();

    void readMassage();

    void displayError(QAbstractSocket::SocketError);

    void connectUpdata();

    void disconnectUpdata();

    void on_sendButton_clicked();

    void on_clearButton_clicked();

    void on_connnectButton_clicked();

    void on_disconnectButton_clicked();

 private:

    //QTcpServer *tcpServer;//不用再建立服务器类了，直接建立下面的套接字

    QTcpSocket *tcpSocket;//直接建立TCP套接字类

    QString tcpIp;//存储IP地址

    QString tcpPort;//存储端口地址

    bool flag;

    Ui::MainWindow *ui;

 };

#endif // MAINWINDOW_H

在mainwindow.cpp中

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include 

MainWindow::MainWindow(QWidget *parent) :

     QMainWindow(parent),

     ui(new Ui::MainWindow)

 {

     ui->setupUi(this);

     ui->sendButton->setEnabled(false);

     ui->disconnectButton->setEnabled(false);

     ui->IPLineEdit->setText("192.168.3.4");

     ui->portLineEdit->setText("4001");

     tcpSocket = NULL;//使用前先清空

 }

 MainWindow::~MainWindow()

 {

     delete tcpSocket;

     delete ui;

 }

 void MainWindow::sendMassage(){}

 void MainWindow::readMassage()

 {

     QByteArray data=tcpSocket->readAll();

     ui->clearLineEdit->setText(QString(data));

 }

 void MainWindow::displayError(QAbstractSocket::SocketError)

 {

     QMessageBox::warning (this, tr("Warnning"), tcpSocket->errorString ());

     tcpSocket->close ();

     ui->connnectButton->setEnabled (true);

     ui->disconnectButton->setEnabled (false);

     ui->sendButton->setEnabled (false);

 }

 void MainWindow::on_sendButton_clicked()

 {

     QString sendmessage;

     sendmessage = ui->sendLineEdit->text();

    /* if(sendmessage == NULL) return;

     QByteArray block;//暂时存储我们需要发送的数据

     QDataStream out(&block,QIODevice::WriteOnly);//TCP必须和数据流一起使用

     out.setVersion(QDataStream::Qt_5_7);//设置数据流的版本（服务器和主机版本一定相同）

     out << sendmessage;

     tcpSocket->write(block);*/

     QByteArray data;

     data.append(sendmessage);

     tcpSocket->write(data);

 }

 void MainWindow::on_clearButton_clicked()

 {

     ui->clearLineEdit->clear();

 }

 void MainWindow::on_connnectButton_clicked()

 {

     flag = false;

     if(tcpSocket) delete tcpSocket;//如果有指向其他空间直接删除

     tcpSocket = new QTcpSocket(this);//申请堆空间有TCP发送和接受操作

     tcpIp = ui->IPLineEdit->text();

     tcpPort = ui->portLineEdit->text();

     if(tcpIp==NULL||tcpPort==NULL)//判断IP和PORT是否为空

     {

         QMessageBox msgBox;

         msgBox.setText("IP or PORT is Empty");

         msgBox.exec();

         return;

     }

     tcpSocket->connectToHost(tcpIp,tcpPort.toInt());//连接主机

     connect(tcpSocket,SIGNAL(error(QAbstractSocket::SocketError)),this,

             SLOT(displayError(QAbstractSocket::SocketError)));//错误连接

     connect(tcpSocket,SIGNAL(connected()),this,

             SLOT(connectUpdata()));//更新连接之后按钮的使能

     connect(tcpSocket,SIGNAL(readyRead()),this,

             SLOT(readMassage()));//读取信息的连接

     ui->connnectButton->setEnabled (false);

     ui->disconnectButton->setEnabled (true);

 }

 void MainWindow::on_disconnectButton_clicked()

 {

     tcpSocket->abort();

     delete tcpSocket;

     tcpSocket=NULL;

     disconnectUpdata();

 }

 void MainWindow::connectUpdata()

 {

     if(!flag)

     {

         QMessageBox msgBox;

         msgBox.setText("TCP connect successful");

         msgBox.exec();

         ui->connnectButton->setEnabled(false);

         ui->sendButton->setEnabled(true);

         ui->disconnectButton->setEnabled(true);

         ui->IPLineEdit->setEnabled(false);

         ui->portLineEdit->setEnabled(false);

     }

     flag=true;

 }

 void MainWindow::disconnectUpdata()

 {

     ui->connnectButton->setEnabled(true);

     ui->sendButton->setEnabled(false);

     ui->disconnectButton->setEnabled(false);

     ui->IPLineEdit->setEnabled(true);

     ui->portLineEdit->setEnabled(true);

 }

在main.cpp中

#include "mainwindow.h"

#include 

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

{

    QApplication a(argc, argv);

    MainWindow w;

    w.show();

    return a.exec();

}

效果:

到这里，实现了TCP双向通信功能。