第Qt基于TCP實現客戶端與服務端的連接//發送與服務器連接信號

connect(connectBtn,SIGNAL(clicked()),this,SLOT(onConnectButtonClicked()));

//連接成功后接收到connected信號

connect(tcpSocket,SIGNAL(connected()),this,SLOT(onTextEditRead()));

//給服務器發送內容

connect(ButtonSend,SIGNAL(clicked()),this,SLOT(onButtonSendClicked()));

//接收來自服務器的內容，信號readReady

connect(tcpSocket,SIGNAL(readyRead()),this,SLOT(onRecesiveDataFromServer()));

connect(ButtonDisconnect,SIGNAL(clicked()),this,SLOT(onDisConnect()));

ClientWidget::~ClientWidget()

voidClientWidget::onConnectButtonClicked()

//獲取服務器IP和端口

QStringipStr=LineEditIPName-text();

qint16portName=LineEditPortName-text().toInt();

QHostAddressip=QHostAddress(ipStr);

//主動和服務器建立連接

tcpSocket-connectToHost(ip,portName);

voidClientWidget::onTextEditRead()

TextEditRead-setText(QString::fromLocal8Bit("成功和服務器建立好連接?。?！"));

connectBtn-setEnabled(false);

ButtonDisconnect-setEnabled(true);

voidClientWidget::onButtonSendClicked()

if(tcpSocket==NULL)

{

return;

}

//獲取編輯框內容

QStringstr=TextEditWrite-toPlainText();

//發送文本內容

tcpSocket-write(str.toUtf8().data());

TextEditWrite-clear();

voidClientWidget::onRecesiveDataFromServer()

QByteArrayarrayAll=tcpSocket-readAll();

QTextCodec*tc=QTextCodec::codecForName("UTF-8");

QStringstr=tc-toUnicode(arrayAll);

//追加到讀取編輯區中

TextEditRead-append(str);

voidClientWidget::onDisConnect()

if(tcpSocket==NULL)

{

return;

}

tcpSocket-disconnectFromHost();

tcpSocket-close();

connectBtn-setEnabled(true);

ButtonDisconnect-setEnabled(false);

TextEditRead-setText(QString::fromLocal8Bit("連接已斷開?。?！"));

}

（1）、ServerWidget.h文件

#ifndefSERVERWIDGET_H

#defineSERVERWIDGET_H

#includeQtGui/QWidget

#include"ui_ServerWidget.h"

#includeQTcpServer

#includeQTcpSocket

#includeQString

#includeQTextCodec

classServerWidget:publicQWidget

Q_OBJECT

public:

ServerWidget(QWidget*parent=0,Qt::WFlagsflags=0);

~ServerWidget();

QTcpServer*tcpServer;

QTcpSocket*tcpSocket;

privateslots:

voidOnConnectTcpServer();

voidOnSendButtonClicked();

voidOnCloseButtonClicked();

voidOnSeResiveData();

voidOnDisconnected();

private:

Ui::ServerWidgetClassui;

#endif//SERVERWIDGET_H

（2）、ServerWidget.cpp文件

#include"stdafx.h"

#include"ServerWidget.h"

ServerWidget::ServerWidget(QWidget*parent,Qt::WFlagsflags)

:QWidget(parent,flags)

ui.setupUi(this);

tcpServer=NULL;

tcpSocket=NULL;

setWindowTitle(QString::fromWCharArray(L"服務器(端口：8888)"));

//箭筒套接字，指定父對象，讓其自動回收空間

tcpServer=newQTcpServer(this);

//監聽并綁定端口

tcpServer-listen(QHostAddress::Any,8888);

connect(tcpServer,SIGNAL(newConnection()),this,SLOT(OnConnectTcpServer()));

connect(ui.sendButton,SIGNAL(clicked()),this,SLOT(OnSendButtonClicked()));

connect(ui.closeButton,SIGNAL(clicked()),this,SLOT(OnCloseButtonClicked()));

connect(tcpServer,SIGNAL(disconnected()),this,SLOT(OnDisconnected()));

ServerWidget::~ServerWidget()

#includeQDebug

voidServerWidget::OnConnectTcpServer()

//取出建立好的套接字

tcpSocket=tcpServer-nextPendingConnection();

//獲取對方的IP和端口號

QStringipStr=tcpSocket-peerAddress().toString();

qint16portName=tcpSocket-peerPort();

QStringconnectStr=QString::fromLocal8Bit("成功連接");

QStringtemp