一起看代码来玩玩QT之13 IO(two TCPServer TcpClient TcpScoket)

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TcpClient.h

#ifndef TCPCLIENT_H#define TCPCLIENT_H#include <QWidget>#include <QTcpSocket>#include <QLineEdit>class TcpClient : public QWidget{    Q_OBJECTpublic:    explicit TcpClient(QWidget *parent = 0);    QTcpSocket* _socket;    QLineEdit* _lineEdit;signals:public slots:    void slotButtonClick();};#endif // TCPCLIENT_H

TcpClient.cpp

#include "TcpClient.h"#include <QHBoxLayout>#include <QPushButton>TcpClient::TcpClient(QWidget *parent) :    QWidget(parent){    _socket = new QTcpSocket(this);    _socket->connectToHost("127.0.0.1", 9988);    _lineEdit = new QLineEdit;    QHBoxLayout* lay = new QHBoxLayout(this);    lay->addWidget(_lineEdit);    QPushButton* button = new QPushButton("Send");    lay->addWidget(button);    connect(button, SIGNAL(clicked()), this, SLOT(slotButtonClick()));    connect(_lineEdit, SIGNAL(returnPressed()), this, SLOT(slotButtonClick()));}void TcpClient::slotButtonClick(){    QString strText = _lineEdit->text();    if(strText.isEmpty())        return; //net 中不能发QString 类型    _socket->write(strText.toUtf8());    _lineEdit->clear();}

TcpServer.h

#ifndef TCPSERVER_H#define TCPSERVER_H#include <QWidget>#include <QTcpServer>#include <QTcpSocket>#include <QTextBrowser>class TcpServer : public QWidget{    Q_OBJECTpublic:    explicit TcpServer(QWidget *parent = 0);    QTcpServer* _server;    QTcpSocket* _socket;    QTextBrowser* _show;signals:public slots:    void slotNetConnection();    void slotReadyRead();};#endif // TCPSERVER_H

TcpServer.cpp

#include "TcpServer.h"#include <QHBoxLayout>#include <QNetworkInterface>#include <QMessageBox>#include "ChooseInterface.h"TcpServer::TcpServer(QWidget *parent) :    QWidget(parent){    // 创建服务器并监听    _server = new QTcpServer;    ChooseInterface dlg;    dlg.exec();    QMessageBox::information(NULL,"you select the ip:", dlg._strSelect);// _server->listen(QHostAddress::Any,9988); 全部地址    _server->listen(QHostAddress(dlg._strSelect), 9988);    // 当有客户端来连接时，调用slotNetConnection方法    connect(_server, SIGNAL(newConnection()),            this, SLOT(slotNetConnection()));    _show = new QTextBrowser;    QHBoxLayout* lay = new QHBoxLayout(this);    lay->addWidget(_show);}void TcpServer::slotNetConnection(){    // 判断是否有未处理的连接    while(_server->hasPendingConnections())    {        // 调用nextPeddingConnection去获得连接的socket        _socket = _server->nextPendingConnection();        _show->append("New connection ....");        // 为新的socket提供槽函数，来接收数据        connect(_socket, SIGNAL(readyRead()),                this, SLOT(slotReadyRead()));    }}void TcpServer::slotReadyRead(){    // 接收数据，判断是否有数据，如果有，通过readAll函数获取所有数据    while(_socket->bytesAvailable() > 0)    {        _show->append("Data arrived ..... ");        QByteArray buf = _socket->readAll();        _show->append(buf);    }}

//选择地址类

ChooseInterface.h

#ifndef CHOOSEINTERFACE_H#define CHOOSEINTERFACE_H#include <QDialog>#include <QComboBox>class ChooseInterface : public QDialog{    Q_OBJECTpublic:    explicit ChooseInterface(QWidget *parent = 0);    QComboBox* _comboBox;    QString _strSelect;signals:public slots:    void slotComboBoxChange(QString);};#endif // CHOOSEINTERFACE_H

ChooseInterface.cpp

#include "ChooseInterface.h"#include <QNetworkInterface>#include <QVBoxLayout>ChooseInterface::ChooseInterface(QWidget *parent) :    QDialog(parent){    /* get all interface  从 <span style="font-family: Arial, Helvetica, sans-serif;">QNetworkInterface 中</span><span style="font-family: Arial, Helvetica, sans-serif;">*/</span>    QList<QHostAddress> addrList = QNetworkInterface::allAddresses();#if 0    QList<QNetworkInterface> infList = QNetworkInterface::allInterfaces();     QList<QNetworkAddressEntry> entryList = infList.at(0).addressEntries();     entryList.at(0).broadcast()#endif    _comboBox = new QComboBox;    QVBoxLayout* lay = new QVBoxLayout(this);    lay->addWidget(_comboBox);    foreach(QHostAddress addr, addrList)    {        quint32 ipaddr = addr.toIPv4Address(); //如果不toIPv4Address ,toString后有 IPv4,和 IPv6        if(ipaddr == 0)            continue;        _comboBox->addItem(QHostAddress(ipaddr).toString());    }    connect(_comboBox, SIGNAL(currentIndexChanged(QString)),            this, SLOT(slotComboBoxChange(QString)));}void ChooseInterface::slotComboBoxChange(QString str){    this->_strSelect = str;}

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