Connecting two objects form another object

[Doko]

Hy

I would like to ask someone for help. I wanted to make a gui server so I created a gui application and in main class I created my server (because if I created it in MainWindow class I had problems with incomingConnection). It was not a problem to connect server class with mainwindow class, but problem arises when I try to connect another object declared in server class with mainwindow, I do not know how to pass object address, so I ask for help. To further illustrate my problem I attached piece of code:

#include "mainwindow.h"
#include <QApplication>
#include "server.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
 
    Server ServerTcp;
    QObject::connect(&ServerTcp,SIGNAL(SetInfo(QString)),&w,SLOT(GetInfo(QString)));
    ServerTcp.StartServer(&w);
 
    return a.exec();
}
 
 
 
#include "server.h"
#include "client.h"
 
Server::Server(QObject *parent) :
    QTcpServer(parent)
{
}
 
void Server::StartServer(QMainWindow *object)
{
    if(listen(QHostAddress::Any,1234)){
        obj = object;
        emit SetInfo("Started");
    }
    else{
        emit SetInfo("Not started!");
    }
}
 
void Server::incomingConnection(int handle)
{
    Client *clientT = new Client(this);
    connect(&clientT,SIGNAL(SetInfo(QString)),&obj,SLOT(GetInfo(QString)));
    clientT->SetSocket(handle);
}

#include "mainwindow.h"
#include <QApplication>
#include "server.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    Server ServerTcp;
    QObject::connect(&ServerTcp,SIGNAL(SetInfo(QString)),&w,SLOT(GetInfo(QString)));
    ServerTcp.StartServer(&w);

    return a.exec();
}



#include "server.h"
#include "client.h"

Server::Server(QObject *parent) :
    QTcpServer(parent)
{
}

void Server::StartServer(QMainWindow *object)
{
    if(listen(QHostAddress::Any,1234)){
        obj = object;
        emit SetInfo("Started");
    }
    else{
        emit SetInfo("Not started!");
    }
}

void Server::incomingConnection(int handle)
{
    Client *clientT = new Client(this);
    connect(&clientT,SIGNAL(SetInfo(QString)),&obj,SLOT(GetInfo(QString)));
    clientT->SetSocket(handle);
}

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Thank you for reply

[jefftee]

If I understand what you're trying to do, shouldn't GetInfo be the signal (i.e. request to get info) and the slot be the SetInfo (i.e. set the info provided by the GetInfo signal)?

Your cleintT variable is a local pointer, which will go out of scope as soon as your Server::incomingConnection method finishes. If you wish to later signal this object, you should save your clientT pointer as a member variable, then you can use to signal in your Server::StartServer method as follows (assuming member pointer is called m_clientT):

void Server::StartServer(QMainWindow *object)
{
    if(listen(QHostAddress::Any,1234)){
        obj = object;
        emit m_clientT->SetInfo("Started");
    }
    else{
    emit m_clientT->SetInfo("Not started!");
    }
}

void Server::StartServer(QMainWindow *object)
{
    if(listen(QHostAddress::Any,1234)){
        obj = object;
        emit m_clientT->SetInfo("Started");
    }
    else{
    emit m_clientT->SetInfo("Not started!");
    }
}

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Is that what you are looking for?

P.S. is obj a member variable or what's the purpose for obj = object?