QT 簡單的網路通訊(tcp ,udp)
阿新 • • 發佈:2019-01-23
最近要用到Qt的Socket部分,網上關於這部分的資料都比較複雜,我在這總結一下,把Socket的主要部分提取出來,實現TCP和UDP的簡單通訊。
1.UDP通訊
UDP沒有特定的server端和client端,簡單來說就是向特定的ip傳送報文,因此我把它分為傳送端和接收端。 注意:在.pro檔案中要新增QT += network,否則無法使用Qt的網路功能。
1.1.UDP傳送端
#include<QtNetwork>
QUdpSocket*sender;
sender =newQUdpSocket(this);
QByteArray datagram =“hello world
//UDP廣播
sender->writeDatagram(datagram.data(),datagram.size(),QHostAddress::Broadcast,6665);
//向特定IP傳送
QHostAddress serverAddress =QHostAddress("10.21.11.66");
sender->writeDatagram(datagram.data(), datagram.size(),serverAddress,6665);
/* writeDatagram函式原型,傳送成功返回位元組數,否則-1
qint64 writeDatagram(const char *data,qint64 size,const QHostAddress &address,quint16 port)
qint64 writeDatagram(const QByteArray &datagram,const QHostAddress &host,quint16 port)
*/
1.2.UDP接收端
#include<QtNetwork>
QUdpSocket*receiver;
//訊號槽
private slots:
void readPendingDatagrams();
receiver =newQUdpSocket(this);
receiver->bind(QHostAddress::LocalHost,6665);
connect(receiver, SIGNAL
void readPendingDatagrams()
{
while(receiver->hasPendingDatagrams()){
QByteArray datagram;
datagram.resize(receiver->pendingDatagramSize());
receiver->readDatagram(datagram.data(), datagram.size());
//資料接收在datagram裡
/* readDatagram 函式原型
qint64 readDatagram(char *data,qint64 maxSize,QHostAddress *address=0,quint16 *port=0)
*/
}
}
2.TCP通訊
TCP的話要複雜點,必須先建立連線才能傳輸資料,分為server端和client端。
2.1.TCP client端
#include<QtNetwork>
QTcpSocket*client;
char*data="hello qt!";
client =newQTcpSocket(this);
client->connectToHost(QHostAddress("10.21.11.66"),6665);
client->write(data);
2.2.TCP server端
#include<QtNetwork>
QTcpServer*server;
QTcpSocket*clientConnection;
server =newQTcpServer();
server->listen(QHostAddress::Any,6665);
connect(server, SIGNAL(newConnection()),this, SLOT(acceptConnection()));
void acceptConnection()
{
clientConnection = server->nextPendingConnection();
connect(clientConnection, SIGNAL(readyRead()),this, SLOT(readClient()));
}
void readClient()
{
QString str = clientConnection->readAll();
//或者
char buf[1024];
clientConnection->read(buf,1024);
}