can not call function of different class

jsulm

@JadeN001 You should really learn to use a debugger. A debugger is one of the most important tools a programmer should use :-)

JonB

@JadeN001
As @jsulm has just said, learning to use a debugger will in the long-run be the best time you spent! Just do it soon.

In the meantime, in on_pushButton_send_clicked() just before you try to call mw->send_MsgToServer(send); I'd put in some more qDebug() statements which show some of the properties of your connection object via mw->.... You're looking to just verify that mw is indeed still pointing at some valid connection, just in case.....

JadeN001

@JonB @jsulm yeah I really appreciate your suggestion. I will start.
I have checked Value of object "mw" by qDebug(). and It returns proper object value.
something like this :

object :  connection(0x201c0350, name="connection")

I thought that might be the issue is ,the object was not being generated properly.But i was wrong.

JonB

@JadeN001
Assuming it really is as you say, and you really have rebuilt your code etc., and you are compiling for/viewing debug, and it's not crashing, it's going to be pretty hard to answer how the line mw->send_MsgToServer(send) could simply "not get executed", without a debugger....

One last thing I can think of, just in case. Your first line in send_MsgToServer() is:

qDebug()<<"in sendmsgserver"<<m_pclientsocket;

Just in case there's some problem serializing m_pclientsocket, temporarily change it to plain:

qDebug()<<"in sendmsgserver"

(I don't think there actually will have been an issue because I think you're only trying to print out the pointer here, but it's worth a try...)

JadeN001

@JonB yeah u r right. Here is problem in m_pClientsocket. Thank you for direct me. now, I am trying to solve socket problem

JadeN001

I have define m_pClientsocket in constructor of class
but it failed to access in send_MsgToServer().
because ,If I define in constuctor then when formclient class define the object on connection class

FormClient::FormClient(QString name, QWidget *parent) :
    QWidget(parent),
    ui(new Ui::FormClient)
{
    ui->setupUi(this);
    delegate=new mydelegate(this);
    mw=new connection(this);
 
}

At that time value of socket is getting changed.
So the changes it bu moving the

    m_pclientsocket= new QTcpSocket(this);

in to another main function.

 void connection::on_pushButton_connect_clicked()
{
    m_pclientsocket= new QTcpSocket(this);

    ui->textEdit_Sendname->clear();
   m_pclientsocket->connectToHost(ui->textEdit_IP->toPlainText(),quint16(ui->textEdit_Port->toPlainText().toInt()));
   if(m_pclientsocket->waitForConnected(1000)){
   qDebug()<<"connected"<<m_pclientsocket;
   ui->label_connection->setText("Connected to Server");
   }
}

send_MsgToServer() can not access it . where i am wrong.? what could be solution?

JadeN001

In send_MsgToServer(). the ans of

void connection::send_MsgToServer(QString msg)
{ 
qDebug()<<"in sendmsgserver"<<m_pclientsocket;
    m_pclientsocket->write(msg.toStdString().c_str());
    qDebug()<<"message sended "<<msg;
}

in sendmsgserver QApplication(0x22fe28)
QIODevice::write (QApplication): device not open

what it is indicating? How can be value of socket be like QApplication.

SGaist

Hi,

Why are you creating a new QTcpSocket each time you call on_pushButton_connect_clicked ?

aha_1980

And why are you using waitForConnected?

this cannot work. use signals&slots!

regards

JadeN001

@SGaist because the Problem i am facing :
if I called new QTcpSocket from constructor,then

FormClient::FormClient(QString name, QWidget *parent) :
    QWidget(parent),
    ui(new Ui::FormClient)
{
    ui->setupUi(this);
    delegate=new mydelegate(this);
    mw=new connection(this);
 
}

this class create QTcpSocket evety time when mw=new connection(this); called.
because of that the void connection::send_MsgToServer(QString msg)
get different value of QTcpsocket.

JadeN001

@aha_1980 yeah i will correct it.but my problem is still there.

SGaist

Currently, with the code you provided, it seems you already have an architectural problem.

Can you describe what you are exactly trying to build ?

JadeN001

@SGaist I am creating one QTableview on clientside.when ever client connected,one editor for chatting will create in that tableview.

If want to send message to John from this editor.but when i send message from particular editor the value of QtcpSocket i am getting is somthing like this "

in sendmsgserver QApplication(0x22fe28)
QIODevice::write (QApplication): device not open

connection.cpp is class where socket is created.
formclient.cpp is class of widgets of chatting.

JadeN001

Can anyone suggest me , have I worked in a proper way or not?