QTcpSocket – client[通俗易懂]

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#include "mainwindow.h"
#include "ui_clientWindow.h"

#include <QMessageBox>
#include <QDateTime>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::clientWindow)
{ 
   
    ui->setupUi(this);

    init();
    initConnect();
}

MainWindow::~MainWindow()
{ 
   
    delete ui;
}

void MainWindow::slotReadError(QAbstractSocket::SocketError error)
{ 
   
    mTcpClient->disconnectFromHost();
    ui->mConnectButton->setText(QStringLiteral("连接"));
    mSwitch = false;
    QMessageBox msgBox;
    msgBox.setText(tr("failed to connect server because %1").arg(mTcpClient->errorString()));
    msgBox.exec();
}

void MainWindow::slotReadData()
{ 
   
    QByteArray buffer = mTcpClient->readAll();
    if(!buffer.isEmpty())
    { 
   
        ui->mReceiveEdit->append(QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss"));
        ui->mReceiveEdit->append(QString::fromUtf8(buffer));
    }
}

void MainWindow::slotConnectNetwork()
{ 
   
    if(mSwitch)
    { 
      //断开
        mTcpClient->disconnectFromHost();
        if (mTcpClient->state() == QAbstractSocket::UnconnectedState || mTcpClient->waitForDisconnected(1000))  //已断开连接则进入if{}
        { 
   
            ui->mConnectButton->setText(QStringLiteral("连接"));
            ui->mSendButton->setEnabled(false);
        }
        mSwitch = false;
    }
    else
    { 
      //连接
        mTcpClient->connectToHost(ui->mAddrEdit->text(), static_cast<quint16>(ui->mPortEdit->text().toInt()));
        if(mTcpClient->waitForConnected(1000))  // 连接成功则进入if{}
        { 
   
            ui->mConnectButton->setText(QStringLiteral("断开"));
            ui->mSendButton->setEnabled(true);
        }
        mSwitch = true;
    }
}

void MainWindow::slotSendText()
{ 
   
    QString data = ui->mSendTextEdit->toPlainText();
    if(data.simplified().size())
    { 
   
        mTcpClient->write(data.toUtf8());
    }
    ui->mSendTextEdit->clear();
}

void MainWindow::init()
{ 
   
    setWindowTitle(QStringLiteral("Client"));

    mTcpClient = new QTcpSocket(this);   //实例化tcpClient
    mTcpClient->abort();                 //取消原有连接

    ui->mSendButton->setEnabled(false);
}

void MainWindow::initConnect()
{ 
   
    connect(mTcpClient, &QTcpSocket::readyRead, this,&MainWindow::slotReadData);
    connect(mTcpClient, SIGNAL(error(QAbstractSocket::SocketError)),
            this, SLOT(slotReadError(QAbstractSocket::SocketError)));


    connect(ui->mConnectButton,&QPushButton::clicked,this,&MainWindow::slotConnectNetwork);
    connect(ui->mClearButton,&QPushButton::clicked,this,[this](){ 
   ui->mReceiveEdit->clear();});
    connect(ui->mSendButton,&QPushButton::clicked,this,&MainWindow::slotSendText);
}

源码链接 Client