文章目录
- 前言
- TCP服务器端程序设计
- 获取本地IPV4地址
- 鼠标点击槽函数程序
- 1.开始监听
- 2.停止监听
- 3.清空文本
- 4.发送按钮
- 其他槽函数程序
- 1.建立新连接
- 2.开始连接
- 3.断开连接
- 4.实现缓冲区数据的读取
- 5.socket状态改变
- 程序参考链接
前言
本篇文章完成了TCP服务器端的程序,程序中用到的系统函数,和自定义函数都进行了注释,如果大家有什么地方不懂可
以私信我。
完整程序和客户端介绍在文章结尾有链接,具体功能如下:
TcpServer端:
- 根据指定IP地址和端口打开网络监听,有客户端连接时创建socket连接
- 采用基于行的数据通信协议,可以接收客户端发的消息,也可以向客户端发送消息
- 在状态栏显示服务器监听状态和socket状态
效果图:
TCP服务器端程序设计
获取本地IPV4地址
QString TcpClient::getLocalIp()
{
//返回主机名
QString hostname = QHostInfo::localHostName();
//返回主机信息
QHostInfo hostInfo = QHostInfo::fromName(hostname);
//返回IP地址列表
QList<QHostAddress> addList = hostInfo.addresses();
QString localIP="";
//判断IP地址列表是否为空
if(!addList.isEmpty())
//遍历IP地址列表,输出主机信息
for(int i=0;i<addList.count();i++)
{
QHostAddress aHost = addList.at(i);
//输出IPV4信息
if(QAbstractSocket::IPv4Protocol==aHost.protocol())
{
localIP= aHost.toString();
break;
}
}
return localIP;
}
鼠标点击槽函数程序
1.开始监听
作为TCP服务器,QTcpServer类通过调用listen()在本机IP地址和端口上开始TCP监听,以等待TCP客户端的接入。
TcpServer::on_actStartListen_triggered()
{
QString IP = ui->comboBox->currentText();
quint16 port = ui->spinBox->value();
QHostAddress addr(IP);
tcpServer->listen(addr,port);
//tcpServer->listen(QHostAddress::LocalHost,port);
ui->plainTextEdit->appendPlainText("Start Listen:");
ui->plainTextEdit->appendPlainText("服务器Address: "+tcpServer->serverAddress().toString());
ui->plainTextEdit->appendPlainText("服务器Port: "+QString::number(tcpServer->serverPort()));
LabListen->setText("Listen State: Start Listen");
}
2.停止监听
void TcpServer::on_actStopListen_triggered()
{
//isListening():判断服务器是否处于监听状态
if(tcpServer->isListening())
{
//close():关闭服务器,停止网络监听
tcpServer->close();
LabListen->setText("Listen State: Stop Listen");
}
}
3.清空文本
void TcpServer::on_actClear_triggered()
{
ui->plainTextEdit->clear();
}
4.发送按钮
void TcpServer::on_btnSend_clicked()
{
QString msg = ui->lineEdit->text();
ui->plainTextEdit->appendPlainText("[out]: "+msg);
ui->lineEdit->clear();
ui->lineEdit->setFocus();
QByteArray str = msg.toUtf8();
str.append('\n');
tcpSocket->write(str);
}
其他槽函数程序
1.建立新连接
void TcpServer::onNewConnection()
{
tcpSocket = tcpServer->nextPendingConnection();//获取接入连接的socket
//第一次连接,手动调用客户连接槽函数
onClientConnected();
connect(tcpSocket,SIGNAL(connected()),this,SLOT(onClientConnected()));
connect(tcpSocket,SIGNAL(disconnected()),this,SLOT(onClientDisconnected()));
connect(tcpSocket,SIGNAL(stateChanged(QAbstractSocket::SocketState)),this,\
SLOT(onStateChange(QAbstractSocket::SocketState)));
onStateChange(tcpSocket->state());
connect(tcpSocket,SIGNAL(readyRead()),this,SLOT(onSocketReadyRead()));
}
2.开始连接
void TcpServer::onClientConnected()
{
ui->plainTextEdit->appendPlainText("Client Socket Connected");
ui->btnSend->setEnabled(true);
//peerAddress():在已连接状态下,返回对方socket的地址
ui->plainTextEdit->appendPlainText("Peer Address: "+tcpSocket->peerAddress().toString());
//peerPort():在已连接状态下,返回对方socket的端口
ui->plainTextEdit->appendPlainText("Peer Port: "+QString::number(tcpSocket->peerPort()));
}
3.断开连接
void TcpServer::onClientDisconnected()
{
ui->plainTextEdit->appendPlainText("Client Socket Disconnected");
//deleteLater():删除一个对象时,依赖此对象的子对象都会被删除,减少内存泄漏的风险
tcpSocket->deleteLater();
}
4.实现缓冲区数据的读取
void TcpServer::onSocketReadyRead()
{
//canReadLine():判断是否有新的一行数据需要读取
while(tcpSocket->canReadLine())
{
//readLine():读取一行数据
ui->plainTextEdit->appendPlainText("[in] "+tcpSocket->readLine());
}
}
5.socket状态改变
void TcpServer::onStateChange(QAbstractSocket::SocketState socketState)
{
switch(socketState)
{
case QAbstractSocket::UnconnectedState:
LabSocketState->setText("Socket State: UnconnectedState"); break;
case QAbstractSocket::HostLookupState:
LabSocketState->setText("Socket State: HostLookupState"); break;
case QAbstractSocket::ConnectingState:
LabSocketState->setText("Socket State: ConnectingState"); break;
case QAbstractSocket::ConnectedState:
LabSocketState->setText("Socket State: ConnectedState"); break;
case QAbstractSocket::BoundState:
LabSocketState->setText("Socket State: BoundState"); break;
case QAbstractSocket::ClosingState:
LabSocketState->setText("Socket State: ClosingState"); break;
case QAbstractSocket::ListeningState:
LabSocketState->setText("Socket State: ListeningState"); break;
}
}