Qt网络----简单的TCP

简易的数据传输：服务器发数据，客户端接收数据(QByteArray类型)

1、客户端

 1    #include<QtNetwork>
 2     QTcpSocket *socket = new QTcpSocket();
 3     socket->connectToHost("127.0.0.1", 6666);
 4     connect(socket, QTcpSocket::readyRead,
 5             [=]()
 6         {
 7         #if 0
 8             QByteArray buf;
 9             buf=socket->readAll();//接数据
10             qDebug()<<buf;
11 #endif
12 #if 0
13             QDataStream in(socket);
14             QString str;
15             int a;
16             in>>str>>a;
17             qDebug()<<"str:"<<str<<"a:"<<a;
18             #endif
19         });

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2、服务器

 1     #include <QtNetwork>
 2     QTcpServer *tcpServer = new QTcpServer();
 3     tcpServer->listen(QHostAddress::LocalHost, 6666);
 4     connect(tcpServer, &QTcpServer::newConnection,
 5             [=]()
 6         {
 7             QTcpSocket *socket=tcpServer->nextPendingConnection();
 8 #if 0
 9             QByteArray buf="hello Network";
10             socket->write(buf);
11 #endif
12 #if 0
13             /*不要同时使用，会出错！  可能是黏包，*/
14             QByteArray buf;
15             QDataStream out(&buf,QIODevice::WriteOnly);
16             /*只发送数字123出错。可能是数据太少，或者是需要以字符串开头*/
17             out<<QString("QDataStream")<<123;
18             socket->write(buf);
19 #endif
20         });

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