Socket之TCP-IP

• 通常的TCP/IP流程如下：

　　TCP/IP的通讯更像是打电话，连接上通了确认是自己拨叫的用户之后才能进行正常通话，更加安全合理。

• Qt中的TCP/IP流程如下：

　　Qt中流程和普通的思路一样，只是封装成了自己的函数，使用更加方便

• 实现的效果如下

• 参考代码如下：

　　服务器.h文件：

 #ifndef WIDGET_H
 #define WIDGET_H

 #include <QWidget>
 #include <QTcpServer>
 #include <QTcpSocket>
 #include <QString>
 namespace Ui {
 class Widget;
 }

 class Widget : public QWidget
 {
     Q_OBJECT

 public:
     explicit Widget(QWidget *parent = );
     ~Widget();

 private slots:
     void on_send_clicked();
     void communication();
     void on_disconnect_clicked();
     void showtext();
 private:
     Ui::Widget *ui;
     QTcpServer *TcpServer;
     QTcpSocket *TcpSocket;
 };

 #endif // WIDGET_H

　　服务器.cpp文件：

 #include "widget.h"
 #include "ui_widget.h"

 Widget::Widget(QWidget *parent) :
     QWidget(parent),
     ui(new Ui::Widget)
 {
     ui->setupUi(this);
     TcpServer = new QTcpServer(this);
     TcpSocket = NULL;
     setWindowTitle("服务器：6666");
     TcpServer->listen(QHostAddress::Any,);
      connect(TcpServer,&QTcpServer::newConnection,this,&Widget::communication);

 }
 void Widget::communication()
 {
     TcpSocket=TcpServer->nextPendingConnection();
     QString ip = TcpSocket->peerAddress().toString();
     ui->textEdit->setText(ip);
     connect(TcpSocket,&QTcpSocket::readyRead,this,&Widget::showtext);

 }
 void Widget::showtext()
 {
     QByteArray array = TcpSocket->readAll();
     ui->textEdit->append(array);
 }
 Widget::~Widget()
 {
     delete ui;
 }

 void Widget::on_send_clicked()
 {
     if(TcpSocket == NULL)
        {
         return;
     }
     QString text = ui->textEdit_2->toPlainText();
     TcpSocket->write(text.toUtf8().data());

 }

 void Widget::on_disconnect_clicked()
 {
     if(TcpSocket == NULL)
        {
         return;
     }
     TcpSocket->disconnectFromHost();
     TcpSocket->close();
     TcpSocket = NULL;

 }

　　客户端.h文件：

 #ifndef SOCKETWIDGET_H
 #define SOCKETWIDGET_H

 #include <QWidget>
 #include <QTcpSocket>
 #include <Qstring>
 #include <QHostAddress>
 namespace Ui {
 class SocketWidget;
 }

 class SocketWidget : public QWidget
 {
     Q_OBJECT

 public:
     explicit SocketWidget(QWidget *parent = );
     ~SocketWidget();
 public slots:
     void dealdata();
     void dealread();
 private slots:
     void on_send_clicked();

     void on_disconnect_clicked();

     void on_connect_clicked();

 private:
     Ui::SocketWidget *ui;
     QTcpSocket *TcpSocket;
 };

 #endif // SOCKETWIDGET_H

　　客户端.cpp文件：

 #include "socketwidget.h"
 #include "ui_socketwidget.h"

 SocketWidget::SocketWidget(QWidget *parent) :
     QWidget(parent),
     ui(new Ui::SocketWidget)
 {
     ui->setupUi(this);
     TcpSocket = new QTcpSocket(this);
     setWindowTitle("客户端");
     connect(TcpSocket,&QTcpSocket::connected,this,&SocketWidget::dealdata);
     connect(TcpSocket,&QTcpSocket::readyRead,this,&SocketWidget::dealread);
 }
 void SocketWidget::dealdata()
 {
     QString str= "已连接服务器";
     ui->read->setText(str);
 }
 SocketWidget::~SocketWidget()
 {
     delete ui;
 }
 void SocketWidget::dealread()
 {
     QByteArray array = TcpSocket->readAll();
     ui->read->append(array);
 }
 void SocketWidget::on_send_clicked()
 {
     QString sendtext = ui->write->toPlainText();
     TcpSocket->write(sendtext.toUtf8().data());
 //发送数据
 }

 void SocketWidget::on_disconnect_clicked()
 {
     TcpSocket->disconnectFromHost();
     TcpSocket->close();
 }

 void SocketWidget::on_connect_clicked()
 {
     quint16  port = ui->port->toPlainText().toInt();
     QString ip =  ui->ip->toPlainText();
     TcpSocket->connectToHost(QHostAddress(ip),port);
 //建立主动连接
 }