accessing and reading public variable of object1 from another object2 or object3

Christian Ehrlicher

Apart from the real problem - why do you need threading here at all? Do you process large data somewhere?

VikramSamy

@Christian-Ehrlicher said in accessing and reading public variable of object1 from another object2 or object3:

Apart from the real problem - why do you need threading here at all? Do you process large data somewhere?

actually the original code already use threading, i just adding stuff to the original code and modifying it according to my needs now.....actually the client is a camera that will send some data to the server which will process using the Data_process class. i dont want to change the architecture as it is already working, now i just need add a extra thing to count the number of clients.

Christian Ehrlicher

There is no need to emit a signal from within the thread since you can count it inside TCP_Server::incomingConnection() - you even already have the count there - in clientcameramap.

Lemat

try out:

in Connection_Thread.h add:

signals:
void thread_is_out (qintptr descriptor);

in Connection_Thread.cpp (slot Disconnected):

void Connection_Thread::Disconnected ()
{
 //run yours codes
  emit thread_is_out (this->socket_descriptor);
}

in TCP_Server.cpp :

void TCP_Server::incomingConnection(qintptr socketDescriptor)
{
  //add
 connect(thread, SIGNAL(thread_is_out (qintptr)), this, SLOT(create_on_function(qintptr)));
}

void TCP_Server::create_on_function(qintptr key)
{ 
clientcameramap.erase(clientcameramap.find(key));
//or
clientcameramap.remove(key);

//and what you want to do
}

just try out!!!

Lemat

This post is deleted!

Lemat

@Lemat

//additional
here is my code to destroy all threads after server stopped

QList <QThread*> thread_list=TCP_Server::findChildren <QThread*>();
foreach (QThread *elem, thread_list) elem->exit(0);

VikramSamy

@Christian-Ehrlicher said in accessing and reading public variable of object1 from another object2 or object3:

There is no need to emit a signal from within the thread since you can count it inside TCP_Server::incomingConnection() - you even already have the count there - in clientcameramap.

yup i already can count , but now let say some clients got disconnected, then i will need to remove the client from the clientcameramap right, and then i need to update to the frontpage object so that it can refresh the label.

For this i created a "Clientdisconnected" slot in the TCP_server to remove the client from the map, as per that if u refer my Connection_Thread::run() functions, once a client signals disconnect, i want call the slot to remove the clients, only this part i confuse because the TCP_server object is created on the mainwindows.cpp, so i cant connect the client disconnect signal to the TCP_server objects slot.

Christian Ehrlicher

@VikramSamy said in accessing and reading public variable of object1 from another object2 or object3:

but now let say some clients got disconnected,

Then you should update your clientcameramap (already now) - otherwise you've old stuff in this map and it's useless. Since you know when a client is disconnected (I assume that you close the thread in Disconnected()) you can watch on the QThread::finished() signal.

KillerSmath

@VikramSamy

You could watch the Qthread::finished() signal.
Disconnect = Call Exit Thread
Remove the item from Map as mentioned by Lemant and finally emit a signal from TCP_Server to update the count on frontpage label.

VikramSamy

@Lemat @Christian-Ehrlicher @KillerSmath

yup it works! thanks, so each time a client connects & diconnects i can know the count, so now im trying pass the count value to the FrontPage Object which is created in the mainwindow.cpp

 FP = new FrontPage(this);  // at mainwindows.cpp

the Frontpage class.h is as below:-

class FrontPage : public QWidget
{
    Q_OBJECT
public:
    explicit FrontPage(QWidget *parent = 0);
    void ServerStatus (bool status);
    QLabel      *serverstatuslabel;
    QLabel      *clientconnectedlabel;
    QLabel      *ServerIPaddr;
    QLabel      *ServerPORTno;
    QLabel      *infolabel;
    QLabel      *clientcount;

signals:

public slots:
    void ClientCount(unsigned int count);

private:
    QVBoxLayout  *vboxlayout;
};

so i need to emit signal at TCP_Server::incomingConnection , and connect it to the FrontPage slots: FrontPage::ClientCount(unsigned int count) then i should also emit a signal from the TCP_Server::ClientDisconnected after removing the client from the clientcameramap to the same slot FrontPage::ClientCount(unsigned int count), so this way i can pass around the count value to be refreshed at the Frontpage label each time a connects/disconnects happens...
But like just now the FrontPage is created in mainwindows.cpp, as per that the frontpage object not visible/accessible to the TCP_server, how to go around with this?? this where i still not much understand... can u tell something about this?? my FrontPage is slot code is as below:-

 void FrontPage::ClientCount(unsigned int count)
  {
      QString tmp = QString::number(count);
      QString Stringtext;

      Stringtext = "number of client connected is = %1";

      clientconnectedlabel->setText(Stringtext.arg(tmp));

      //QString tmp = QString::number(myInt)
      //QString tmp = tr("%1").arg(myInt)
  }

but i need a proper way to connect both signals emitted from TCP_Server::incomingConnections and TCP_Server::ClientDisconnected to the FrontPage slot.

below is some part of my related mainwindows.cpp code:-

FP = new FrontPage(this);
m_server = new TCP_Server(m_process_data,this);                                                                       

     if(m_server->Start_Server())
     {      connect(m_server,SIGNAL(status(APC_CAMERA_DATA)),m_sql_process,SLOT(Store_APC_CAMERA_DATA(APC_CAMERA_DATA)));
         FP->ServerStatus(true);
     }
     else
     {
         FP->ServerStatus(false);
     }

    setCentralWidget(FP);
/*so this FP is just a gui widget display the server is running and number of clients connected to it*/

VikramSamy

@KillerSmath said in accessing and reading public variable of object1 from another object2 or object3:

finally emit a signal from TCP_Server to update the count on frontpage label.

The problem is , i can emit signal from TCP_server to update the count on the FrontPage label, as i just explain in my previous post.. and i also already created the slot functions of FrontPage, and this slot should connected with the TCP_server signal for update, now here is problem, the signal & slot need Object1 (TCP_server) and Object 2 (FrontPage), and as FrontPage object is created on the mainwindow.cpp, im stuck on how make this to work coz FrontPage object is not available/visible to TCP_Server,

jsulm

@VikramSamy Is TCP_Server accessible in main window? If so do the connection there.