[SOLVED] Help using SLOTs

drobe011

I cannot for the life of me, get my slot to be connected/recognized. Any help would be appreciated.

The following class just connects and polls a simple telnet server running on port 8090. The connection and reading work fine. (I was originally using UDP,hence the weird file/class names).

xpudp.h
@#ifndef XPUDP_H
#define XPUDP_H

#include <QtNetwork/QTcpSocket>

class XpUDP : public QObject
{
public:
XpUDP(char * host = "localhost", int port = 8090);
bool getIsConnected();
QTcpSocket * getTelnet();
bool connectTelnet();
private:
QTcpSocket * telnet;
void initSocket();
bool isConnected;
char * myhost;
int myport;
private slots:
void readPort();
};

#endif // XPUDP_H
@

xpudp.cpp
@#include "xpudp.h"
#include <iostream>
#include <QtNetwork>

XpUDP::XpUDP(char * host, int port)
{
myhost = host;
myport = port;
initSocket();
}

void XpUDP::initSocket()
{
telnet = new QTcpSocket;
isConnected = connectTelnet();
}

QTcpSocket * XpUDP::getTelnet() /* Just have this for testing purposes */
{
return telnet;
}

bool XpUDP::getIsConnected()
{
return isConnected;
}

void XpUDP::readPort() // This SLOT not being recognized
{
int read_ret = 0;
char buf[512];
memset(buf, 0, 512);

read_ret =  telnet->read(buf, 512);
//printf("recived[%i] '%s'\n", read_ret, buf);
std::cout << buf;
memset(buf, 0, 512);

}

bool XpUDP::connectTelnet()
{
telnet->connectToHost(myhost, myport);
if (telnet->waitForConnected(5000) == false)
{
return false;
}
else
{
connect(telnet, SIGNAL(readyRead()),
this, SLOT(readPort())); /* I get QObject::connect: No such slot QObject::readPort() */
return true;
}
}
@
During runtime, if a connection is made I get this message in the console: QObject::connect: No such slot QObject::readPort(). Any help getting my slot reacting to the signal would be appreciated, or if events would be the way to go.

I have Qt 4.8.2, using Qt Creator 2.4.1, qmake 2.01a, g++ 4.7.0, on a Linux Fedora 17 x86_64 system.

FYI if it helps, I am making a moving map (MarbleMap) and instrument cluster for a flight sim.

Thanks, Dave

andre

You forgot to include the Q_OBJECT macro in your class declaration.

mlong

Be sure and add the Q_OBJECT macro when you define your class.

[Edit: Andre beat me to it.]

drobe011

Awesome, works now.

After I added Q_OBJECT, did a make clean and rebuilt; I got an undefined reference to vtable for xxx. After running qmake -r all is good.

Thanks, Dave

mlong

Be sure and edit your initial post to add [Solved] to the title. Thanks!