我写了一个计算 Pi 的程序。它近似于 3.14 之后的数字位置……</p>
现在我想知道我的程序当前计算了哪个位置。但我不想在电脑前等待。因此我实现了一个 QTcpServer 和作为客户端访问服务器的可能性。连接工作正常。在下一步中,我想通过服务器发送 Pi 的当前值和位数作为广播。每次客户端连接服务器时,客户端都应该读取这些信息。信息不断更新,客户端只要连接就应该得到这些信息。为了更新客户端的传入信息,我需要一些通知或轮询功能。如何实现信息的广播(服务器)和更新通知(客户端)。
标题
#include <QObject>
#include <QDebug>
#include <QTcpServer>
#include <QTcpSocket>
class HTTPServer : public QObject
{
Q_OBJECT
public:
explicit HTTPServer(QObject *parent = 0);
int value;
signals:
public slots:
void newConnection();
void readClient();
private:
QTcpServer *server;
QTcpSocket *socket;
};
cpp
#include "httpserver.h"
HTTPServer::HTTPServer(QObject *parent) :
QObject(parent)
{
server = new QTcpServer(this);
connect(server, SIGNAL(newConnection()), this, SLOT(newConnection()));
if(!server->listen(QHostAddress::Any, 9999))
qDebug() << "Server could not started!";
else
qDebug() << "Server started and listening ...";
}
void HTTPServer::calculate()
{
for(int i = 0; i < 100000000; i++)
value = i;
}
void HTTPServer::newConnection()
{
socket = server->nextPendingConnection();
socket->write("client connected\r\n");
socket->flush();
socket->waitForBytesWritten(3000);
this->calculate();
char buffer [50];
sprintf(buffer, "%d\r\n", value);
socket->write(buffer);
socket->flush();
socket->waitForBytesWritten(3000);
connect(socket, SIGNAL(readyRead()), this, SLOT(readClient()), Qt::DirectConnection);
}
void HTTPServer::readClient()
{
QByteArray Data = socket->readAll();
qDebug() << "Data in: " << Data;
socket->write(Data);
//if ((std::string stdString(Data.constData(), Data.length())) == "quitServer")
// server->close();
}
int value
应该模拟 Pi 值。