15.TCP编程

服务器

#include "tcpserverwig.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    TcpServerWig w;
    w.show();

    return a.exec();
}

#ifndef TCPSERVERWIG_H
#define TCPSERVERWIG_H

#include <QtWidgets>
#include <QTcpServer>
#include <QTcpSocket>

namespace Ui {
class TcpServerWig;
}

class TcpServerWig : public QWidget
{
    Q_OBJECT

public:
    explicit TcpServerWig(QWidget *parent = 0);
    ~TcpServerWig();

private:
    Ui::TcpServerWig *ui;
    QTcpServer *server;
    QTcpSocket *client;

private slots:
    void connectSlot();
    void dataSlot();
};

#endif // TCPSERVERWIG_H

#include "tcpserverwig.h"
#include "ui_tcpserverwig.h"

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

    //1.实例化QTcpServer对象
    server = new QTcpServer(this);

    //2.绑定IP+PORT，进入监听状态
#if 1
    server->listen(QHostAddress(ui->ipEdit->text()), ui->portEdit->text().toUShort());
#else
    server->listen(QHostAddress::Any, ui->portEdit->text().toUShort());
#endif

    //3.监听newConnection信号
    QObject::connect(server, SIGNAL(newConnection()),
                     this,  SLOT(connectSlot()));
}

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

/**
 * @brief 接收到newConnection信号以后，触发此槽
 */
void TcpServerWig::connectSlot()
{
    //4.接收客户端的连接
    client = server->nextPendingConnection();
    ui->textEdit->setText("new connect coming");

    //5.接收客户端的数据，客户端数据到达会触发readyRead信号
    QObject::connect(client, SIGNAL(readyRead()),
                     this,  SLOT(dataSlot()));
}

void TcpServerWig::dataSlot()
{
    //获取来自客户端的数据
    QByteArray buf = client->readAll();

    //处理数据
    ui->textEdit->setText(QString(buf));
}

客户端

#include "tcpclientwig.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

//    QTextCodec *code = QTextCodec::codecForName("utf-8");
//    QTextCodec::setCodecForLocale(code);

    TcpClientWig w;
    w.show();

    return a.exec();
}

#ifndef TCPCLIENTWIG_H
#define TCPCLIENTWIG_H

#include <QtWidgets>
#include <QTcpSocket>
#include <QHostAddress>

namespace Ui {
class TcpClientWig;
}

class TcpClientWig : public QWidget
{
    Q_OBJECT

public:
    explicit TcpClientWig(QWidget *parent = 0);
    ~TcpClientWig();

private slots:
    void on_connectBtn_clicked();

    void on_sendBtn_clicked();

private:
    Ui::TcpClientWig *ui;
    QTcpSocket *client;
};

#endif // TCPCLIENTWIG_H

#include "tcpclientwig.h"
#include "ui_tcpclientwig.h"

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

    //1.实例化QTcpSocket对象
    client = new QTcpSocket(this);
}

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

void TcpClientWig::on_connectBtn_clicked()
{
    //2.连接到服务器
    client->connectToHost(QHostAddress(ui->ipEdit->text()), ui->portEdit->text().toUShort());
    if (client->waitForConnected(1000)){
        ui->textEdit->setText("connect success");
    }else{
        ui->textEdit->setText("connect failed");
    }
}

void TcpClientWig::on_sendBtn_clicked()
{
    //3.发送内容给服务器
    client->write(ui->sendEdit->text().toUtf8());
}