本文小编为大家详细介绍“Qt中TCP协议通信怎么使用”,内容详细,步骤清晰,细节处理妥当,希望这篇“Qt中TCP协议通信怎么使用”文章能帮助大家解决疑惑,下面跟着小编的思路慢慢深入,一起来学习新知识吧。
TCP协议是经常使用的通信方式。在QT中做了非常友好的封装,使用非常方便。
需要添加的模块:network
Qt中的TCP类:QTcpSocket , QTcpServer
连接目标地址和端口
virtual void QTcpSocket ::connectToHost(const QHostAddress &address, quint16 port, OpenMode mode = ReadWrite);
发送数据
inline qint64 QTcpSocket ::write(const QByteArray &data)
监听某个地址和端口号
bool QTcpServer::listen(const QHostAddress &address = QHostAddress::Any, quint16 port = 0);
有新的连接信号
void QTcpServer::newConnection();
是否有新的连接
virtual bool QTcpServer::hasPendingConnections() const;
获取新的连接,必须处理完才能继续接收到连接
virtual QTcpSocket *QTcpServer::nextPendingConnection();
收到新的数据信号
void QTcpSocket::readyRead();
读取收到的数据,必须读取完才能继续接收
QByteArray readAll();
客户端
#include <QTcpSocket>
#include <QWidget>
#include <QLineEdit>
class Client : public QWidget
{
Q_OBJECT
public:
Client(QWidget *parent);
public slots:
void slotSendButtonClick();
private:
QTcpSocket *_socket;
QLineEdit *_lineEdit;
bool _isConnected;
};
#include "client.h"
#include <QPushButton>
#include <QHBoxLayout>
Client::Client(QWidget *parent)
: QWidget(parent)
{
_socket = new QTcpSocket(this);
_lineEdit = new QLineEdit(this);
QPushButton *sendButton = new QPushButton("send");
connect(sendButton, SIGNAL(clicked()), this, SLOT(slotSendButtonClick()));
connect(_lineEdit, SIGNAL(returnPressed()), this, SLOT(slotSendButtonClick()));
QHBoxLayout *lay = new QHBoxLayout(this);
lay->addWidget(_lineEdit);
lay->addWidget(sendButton);
_isConnected = false;
}
void Client::slotSendButtonClick()
{
if (!_isConnected)
{
_socket->connectToHost("127.0.0.1", 9988);
_isConnected = true;
}
QString text = _lineEdit->text();
if (!text.isEmpty())
{
_socket->write(text.toUtf8());//发送数据
_lineEdit->clear();
}
}
服务端
#include <QWidget>
#include <QTcpServer>
#include <QTcpSocket>
class QTextBrowser;
class Server :public QWidget
{
Q_OBJECT
public:
Server(QWidget *parent);
public slots:
void slotCurrentIndexChanged(const QString&);
void slotNewConnection();
private:
QTcpServer *_server;
QTcpSocket *_socket;
QTextBrowser *_textBrowser;
};
#include "server.h"
#include <QHostAddress>
#include <QTextBrowser>
#include <QByteArray>
#include <QGridLayout>
#include <QNetworkInterface>
#include <QComboBox>
Server::Server(QWidget *parent)
{
_server = new QTcpServer(this);
//_server->listen(QHostAddress::Any, 9988);//监听跟本主机相连的所有网口
connect(_server, SIGNAL(newConnection()),this, SLOT(slotNewConnection()) );
QList<QHostAddress> addrList = QNetworkInterface::allAddresses();
QComboBox *comboBox = new QComboBox;
for (const QHostAddress& addr : addrList)
{
quint32 ipAddr = addr.toIPv4Address();
if (ipAddr != 0)
{
comboBox->addItem(QHostAddress(ipAddr).toString());
}
}
connect(comboBox, SIGNAL(currentIndexChanged(const QString&)), this, SLOT(slotCurrentIndexChanged(const QString&)));
_textBrowser = new QTextBrowser(this);
QGridLayout *lay = new QGridLayout(this);
lay->addWidget(comboBox, 0, 0);
lay->addWidget(_textBrowser,1,0);
}
void Server::slotCurrentIndexChanged(const QString& item)
{
if (!_server->isListening())
{
_server->listen(QHostAddress(item), 9988);
}
_textBrowser->append("listen...");
}
void Server::slotNewConnection()
{
_textBrowser->append("connecting...");
while (_server->hasPendingConnections())//必须处理完所有的连接,否则有新连接时就不会在发信号过来
{
_socket = _server->nextPendingConnection();
connect(_socket, &QTcpSocket::readyRead, [&]() {
_textBrowser->append("receive message...");
QByteArray newMessage = _socket->readAll();
_textBrowser->append(QString(newMessage));
});
}
}
使用效果
读到这里,这篇“Qt中TCP协议通信怎么使用”文章已经介绍完毕,想要掌握这篇文章的知识点还需要大家自己动手实践使用过才能领会,如果想了解更多相关内容的文章,欢迎关注亿速云行业资讯频道。
亿速云「云服务器」,即开即用、新一代英特尔至强铂金CPU、三副本存储NVMe SSD云盘,价格低至29元/月。点击查看>>
免责声明:本站发布的内容(图片、视频和文字)以原创、转载和分享为主,文章观点不代表本网站立场,如果涉及侵权请联系站长邮箱:is@yisu.com进行举报,并提供相关证据,一经查实,将立刻删除涉嫌侵权内容。