我尝试使用Qt和C ++编写简单的服务器。这是代码:
#include "mytcpserver.h"
MyTcpServer::MyTcpServer(QObject *parent) :
QObject(parent)
{
server = new QTcpServer(this);
// whenever a user connects, it will emit signal
connect(server, SIGNAL(newConnection()),
this, SLOT(newConnection()));
if(!server->listen(QHostAddress("127.0.0.1"), 3333))
{
qDebug() << "Server could not start";
}
else
{
qDebug() << "Server started!";
}
}
void MyTcpServer::on_readyRead()
{
QTcpSocket * senderSocket = dynamic_cast<QTcpSocket *>(sender());
if (senderSocket)
{
qDebug() << "reading data";
qDebug() << senderSocket->readAll();
}
}
void MyTcpServer::newConnection()
{
// need to grab the socket
QTcpSocket *sok=new QTcpSocket();
sok = server->nextPendingConnection();
if (sok)
{
connect(sok,SIGNAL(readyRead()),this,SLOT(on_readyRead()));
connect(sok,SIGNAL(disconnected()),sok,SLOT(deleteLater()));
}
sok->write("Writing");
}
PHP客户端的一部分:
$address = "127.0.0.1";
$service_port = "3333";
echo "Attempting to connect to '$address' on port '$service_port'...";
$result = socket_connect($socket, $address, $service_port);
if ($result === false) {
echo "socket_connect() failed.\nReason: ($result) " . socket_strerror(socke$
} else {
echo "OK.\n";
}
$in = "HEAD / HTTP";
$out = '';
echo "Sending HTTP HEAD request...";
socket_write($socket, $in, strlen($in));
echo "OK.\n";
echo "Reading response:\n\n";
while ($out = socket_read($socket, 2048)) {
echo $out;
}
问题是我无法从php客户端读取,特别是信号readyRead没有被发出。此外,如果我尝试键入命令行:telnet 127.0.0.1 3333然后服务器只响应&#34;写&#34;并退出。
答案 0 :(得分:1)
试试这个:
#include "mytcpserver.h"
MyTcpServer::MyTcpServer(QObject *parent) :
QObject(parent)
{
server = new QTcpServer(this);
// whenever a user connects, it will emit signal
connect(server, SIGNAL(newConnection()), this, SLOT(newConnection()));
if(!server->listen(QHostAddress("127.0.0.1"), 3333))
{
qDebug() << "Server could not start";
}
else
{
qDebug() << "Server started!";
}
}
void MyTcpServer::on_readyRead()
{
QTcpSocket * senderSocket = dynamic_cast<QTcpSocket*>(sender());
if(senderSocket)
{
qDebug() << "reading data";
qDebug() << senderSocket->readAll();
}
}
void MyTcpServer::newConnection()
{
// need to grab the socket
QTcpSocket * newSocket = server->nextPendingConnection();
if(newSocket)
{
connect(newSocket ,SIGNAL(readyRead()),this,SLOT(on_readyRead()));
//Additionnal auto clean-up without keeping track of the pointer
connect(newSocket ,SIGNAL(disconnected()),newSocket ,SLOT(deleteLater()));
}
}
(当你声明:
QTcpSocket * sok = new QTcpSocket();
这将创建一个本地QTcpSocket指针,该指针隐藏了类的sok
成员。
此外,您使用new创建QTcpSocket,并在下一行丢失它(内存泄漏)
sok = server-&gt; nextPendingConnection();
因此,类的sok
成员变量永远不会与传入连接一起使用。
您在sok
类中使用了名为MyTcpServer
的成员变量,在sok
中使用了局部变量MyTcpServer::on_readyRead
,这是一个坏主意。
正确使用QTcpServer将是: