QT之服务器与客户端的搭建

服务器的搭建：

const QString IP = “127.0.0.1”;
QTcpServer *tcp_server;
QTcpSocket *cfd;

tcp_server = new QTcpServer(this);
if(! tcp_server->listen(QHostAddress::LocalHost, SERV_PORT))
{
qDebug()<errorString();
close();
}

connect(tcp_server, SIGNAL(newConnection()), this, SLOT(newconnect())); //等待客户端的链接

QDataStream in(cfd);

in.setVersion(QDataStream::Qt_5_0);                 /*加密传输*/
if(blocksize == 0)
{
    if(cfd->bytesAvailable() < (int)sizeof(quint16))
    {
        return;
    }
    in>>blocksize;
}qDebug()<<"**9*";
if(cfd->bytesAvailable() < blocksize)
{
    return;
}qDebug()<<"**10*";
in>>message;                                        /*将读到的存入message*/


cfd->read((char*)&message,cfd->bytesAvailable());

服务器发送给客户端

        message_recv.cmd = 101;
        QByteArray block;
        QDataStream out(&block, QIODevice::WriteOnly);
        out.setVersion(QDataStream::Qt_4_0);
        out<<(quint16)0;
        out<seek(0);
        out<<(quint16)(block.size()-sizeof(quint16));
        cfd->write(block, block.length());

客户端与服务器链接

tcpsocket = new QTcpSocket(this);
tcpsocket->abort();
tcpsocket->connectToHost(IP, SERV_PORT);

发送给服务器
QByteArray block;
QDataStream out(&block, QIODevice::WriteOnly);
out.setVersion(QDataStream::Qt_4_0);
out<<(quint16)0;
out< out.device()->seek(0);
out<<(quint16)(block.size()-sizeof(quint16));
tcpsocket->write(block, block.length());

connect(tcpsocket, SIGNAL(readyRead()), this, SLOT(read_server()));     /*接收服务器信息*/

接收服务器的信息
QDataStream in(tcpsocket);

in.setVersion(QDataStream::Qt_4_6);                 //加密传输
if(blocksize == 0)
{
    if(tcpsocket->bytesAvailable() < (int)sizeof(quint16))
    {
        return;
    }
    in>>blocksize;
}
if(tcpsocket->bytesAvailable() < blocksize)
{
    return;
}
in>>message;                                        //将读到的存入message