Qt进阶-网口通信

• 获取当前IP
• 服务端
• • 服务端开启监听
  • 新的客户端连接到达
  • 服务端接收数据
  • 服务端发送数据
• 客户端
• • 连接到服务端
  • 客户端接收数据
  • 客户端发送数据

获取当前IP

QList<QHostAddress> addressList = QNetworkInterface::allAddresses();	//获取所有的网络列表

QString IP = "";

for each(QHostAddress address in addressList)
{
	//获取Ipv4网络，并且非空且不等于127.0.0.1
	if (address.protocol() == QAbstractSocket::IPv4Protocol &&address != QHostAddress::Null &&	address != QHostAddress::LocalHost)
	{
		IP = address.toString();
		ui->lineEdit_socketIP->setText(IP);
		break;
	}
}

---

服务端

服务端开启监听

QTcpServer *m_tcpServer = new QTcpServer;			//tcp服务端对象

QString serverIP = ui->lineEdit_socketIP->text();
int serverPort = ui->lineEdit_portId->text().toInt();

bool flg = m_tcpServer->listen(QHostAddress(serverIP), serverPort);

新的客户端连接到达

connect(m_tcpServer, SIGNAL(newConnection()), this, SLOT(sls_tcpServerNewConnection()));	//tcp服务端有新连接到达

void ComNetTool::sls_tcpServerNewConnection()
{
	QTcpSocket *newSocket = m_tcpServer->nextPendingConnection();

	connect(newSocket, SIGNAL(readyRead()), this, SLOT(sls_tcpServerRecvMsg()));			//tcp客户端接收数据

	ui->cbBox_socketInfo->addItem(newSocket->peerAddress().toString() + ":" + QString::number(newSocket->peerPort()));

	m_clientList.append(newSocket);
}

服务端接收数据

void ComNetTool::sls_tcpServerRecvMsg()
{
	QTcpSocket *s = (QTcpSocket *)sender();

	QByteArray recvBuffer = s->readAll();		//获取网口数据

	if (!recvBuffer.isEmpty())
	{
		ui->textEdit_recText->append(QString("[网口:从%1:%2接收]\r\n").arg(s->peerAddress().toString()).arg(s->peerPort()) + QString::fromLocal8Bit(recvBuffer));		//显示数据，fromLocal8Bit防止中文乱码
	}
}

服务端发送数据

int socketIndex = ui->cbBox_socketInfo->currentIndex();

if (0 == socketIndex)		//给所有客户端对象发送
{
	for each (QTcpSocket *s in m_clientList)
	{
		s->write(data);
	}
}
else						//给单一客户端对象发送
{
	m_clientList.at(socketIndex - 1)->write(data);
}

---

客户端

连接到服务端

QTcpSocket *m_tcpSocket = new QTcpSocket;			//tcp客户端对象

QString serverIP = ui->lineEdit_socketIP->text();
int serverPort = ui->lineEdit_portId->text().toInt();

//连接到服务端
m_tcpSocket->abort();								//断开连接
m_tcpSocket->connectToHost(serverIP, serverPort);	//连接服务端
bool bRet = m_tcpSocket->waitForConnected(1000);

if (!bRet)
{
	//...
}
else
{
	ui->cbBox_socketInfo->addItem(m_tcpSocket->localAddress().toString() + ":" + QString::number(m_tcpSocket->localPort()));	//当前客户端信息
}

客户端接收数据

connect(m_tcpSocket, SIGNAL(readyRead()), this, SLOT(sls_tcpSocketRecvMsg()));				//tcp客户端接收数据

void ComNetTool::sls_tcpSocketRecvMsg()
{
	QByteArray recvBuffer = m_tcpSocket->readAll();		//获取网口数据

	if (!recvBuffer.isEmpty())
	{
		ui->textEdit_recText->append(QString::fromLocal8Bit(recvBuffer));		//显示数据，fromLocal8Bit防止中文乱码
	}
}

客户端发送数据

QByteArray sendData = ui->textEdit_send->toPlainText().toLocal8Bit();		//防止中文乱码

m_tcpSocket->write(sendData);			//写入网口数据