Server服务器端
QT版本5.6.1
- 界面设计
- 工程文件:
添加 network 模块
- 头文件引入TcpServer类和TcpSocket:QTcpServer和QTcpSocket
#include <QTcpServer>
#include <QTcpSocket>
- 创建server对象并实例化:
/*h文件中*/QTcpServer *tcpServer;/*cpp文件中*/tcpServer = new QTcpServer(this);
使用This作为父对象,方便结束进程生命周期时,释放内存空间
- 构建槽函数:
private slots:void newConnection_Slot();void readyRead_Slot();void stateChanged_Slot(QAbstractSocket::SocketState);
注 : 在C++的类中声明函数时可以不写参数名只写参数类型,但是,在实现时必须写出参数名。例如 : void stateChanged_Slot(QAbstractSocket::SocketState);形参是枚举类型,但是没有具体的形参名
newConnection_Slot: 当有客户端的socket建立连接时,tcpserver会发送newConnection()信号,触发连接槽函数,用于创建一个新的socket与客户端对接
connect(tcpServer,SIGNAL(newConnection()),this,SLOT(newConnection_Slot()));
void Widget::newConnection_Slot()
{ui->recvEdit->append("Have a clinet connection");QTcpSocket *temptcpSocket = tcpServer->nextPendingConnection();connect(temptcpSocket,SIGNAL(readyRead()),this,SLOT(readyRead_Slot()));connect(temptcpSocket,SIGNAL(stateChanged(QAbstractSocket::SocketState)),this,SLOT(stateChanged_Slot(QAbstractSocket::SocketState)));// 客户端的ip地址QString ipaddr = temptcpSocket->peerAddress().toString();quint16 port = temptcpSocket->peerPort();// 打印客户端连接的端口信息ui->recvEdit->append("服务端:客户端的ip地址:" + ipaddr);ui->recvEdit->append("服务端:客户端的端口:" + QString::number(port));}
readyRead_Slot : 当有客户端的socket发送数据过来,服务端用来与客户端对接的socket发送数据可读信号readyRead(),触发槽函数,读数据
connect(tcpSocket,SIGNAL(readyRead()),this,SLOT(readyRead_Slot()));
void Widget::readyRead_Slot()
{//sender()返回触发该函数的信号所属者的指针QTcpSocket *tcpSocket = (QTcpSocket *)sender();QString buf;buf = tcpSocket->readAll();ui->recvEdit->append(buf);}
stateChanged_Slot(QAbstractSocket::SocketState) : 当服务端的socket与客户端断开连接时,会发送连接状态改变信号,触发槽函数
void Widget::stateChanged_Slot(QAbstractSocket::SocketState socketState)
{QTcpSocket *tcpSocket = (QTcpSocket *)sender();switch(socketState){case QAbstractSocket::UnconnectedState:ui->recvEdit->append("connection end");tcpSocket->deleteLater();break;default:break;}}
- ui按键槽函数:
void on_openBt_clicked();void on_colseBt_clicked();void on_sendBt_clicked();
void on_openBt_clicked() : 打开服务端
void Widget::on_openBt_clicked()
{//判断输入的端口号是否为空,为空则直接返回if(ui->portEdit->text().isEmpty()){ui->recvEdit->append("port is empty!!");return;}//启动监听,QHostAddress::Any表示所有IP地址tcpServer->listen(QHostAddress::Any, ui->portEdit->text().toUInt());ui->recvEdit->append("open successful");ui->openBt->setEnabled(false);ui->colseBt->setEnabled(true);
}
on_colseBt_clicked : 关闭客户端
void Widget::on_colseBt_clicked()
{//关闭tcpserver知识关闭的监听功能,不会有新的客户端建立连接,但是已经建立连接的socket仍然可以通信tcpServer->close();ui->recvEdit->append("close successful");ui->openBt->setEnabled(true);ui->colseBt->setEnabled(false);
}
on_sendBt_clicked : 发送数据
void Widget::on_sendBt_clicked()
{//返回server端与客户端建立连接的所有socketQList <QTcpSocket *> socketList = tcpServer->findChildren<QTcpSocket *>();qDebug() << "tcpSocket 数量:" << socketList.count() << endl;if (socketList.count() == 0) {ui->recvEdit->append("当前没有客户端连接,请先与客户端连接!");return;}foreach (QTcpSocket *tmpTcpSocket, socketList) {// 服务端向每个客户端发送消息tmpTcpSocket->write(ui->sendEdit->text().toUtf8());}ui->recvEdit->append("服务端:" + ui->sendEdit->text());
}
工程源码:
widget.h:
#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QTcpServer>
#include <QTcpSocket>namespace Ui {
class Widget;
}class Widget : public QWidget
{Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();void state_Slot(QAbstractSocket::SocketState);private:Ui::Widget *ui;QTcpServer *tcpServer;private slots:void newConnection_Slot();void readyRead_Slot();void stateChanged_Slot(QAbstractSocket::SocketState);void on_openBt_clicked();void on_colseBt_clicked();void on_sendBt_clicked();
};#endif // WIDGET_H
widget.cpp
#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget)
{ui->setupUi(this);tcpServer = new QTcpServer(this);connect(tcpServer,SIGNAL(newConnection()),this,SLOT(newConnection_Slot()));
}Widget::~Widget()
{delete ui;
}void Widget::newConnection_Slot()
{ui->recvEdit->append("Have a clinet connection");QTcpSocket *temptcpSocket = tcpServer->nextPendingConnection();connect(temptcpSocket,SIGNAL(readyRead()),this,SLOT(readyRead_Slot()));connect(temptcpSocket,SIGNAL(stateChanged(QAbstractSocket::SocketState)),this,SLOT(stateChanged_Slot(QAbstractSocket::SocketState)));// 客户端的ip地址QString ipaddr = temptcpSocket->peerAddress().toString();quint16 port = temptcpSocket->peerPort();// 打印客户端连接的端口信息ui->recvEdit->append("服务端:客户端的ip地址:" + ipaddr);ui->recvEdit->append("服务端:客户端的端口:" + QString::number(port));}void Widget::readyRead_Slot()
{//sender()返回触发该函数的信号所属者的指针QTcpSocket *tcpSocket = (QTcpSocket *)sender();QString buf;buf = tcpSocket->readAll();ui->recvEdit->append(buf);}void Widget::stateChanged_Slot(QAbstractSocket::SocketState socketState)
{QTcpSocket *tcpSocket = (QTcpSocket *)sender();switch(socketState){case QAbstractSocket::UnconnectedState:ui->recvEdit->append("connection end");tcpSocket->deleteLater();break;default:break;}}void Widget::on_openBt_clicked()
{if(ui->portEdit->text().isEmpty()){ui->recvEdit->append("port is empty!!");return;}tcpServer->listen(QHostAddress::Any, ui->portEdit->text().toUInt());ui->recvEdit->append("open successful");ui->openBt->setEnabled(false);ui->colseBt->setEnabled(true);
}void Widget::on_colseBt_clicked()
{tcpServer->close();ui->recvEdit->append("close successful");ui->openBt->setEnabled(true);ui->colseBt->setEnabled(false);
}void Widget::on_sendBt_clicked()
{//返回server端与客户端建立连接的所有socketQList <QTcpSocket *> socketList = tcpServer->findChildren<QTcpSocket *>();qDebug() << "tcpSocket 数量:" << socketList.count() << endl;if (socketList.count() == 0) {ui->recvEdit->append("当前没有客户端连接,请先与客户端连接!");return;}foreach (QTcpSocket *tmpTcpSocket, socketList) {// 服务端向每个客户端发送消息tmpTcpSocket->write(ui->sendEdit->text().toUtf8());}ui->recvEdit->append("服务端:" + ui->sendEdit->text());
}