How to share signals and slots between different classes?

roboterprogrammer

Hi,
first let me introduce the programm situation:

The programm connects to an TCPIP Server,
and it launches its own TCPIP Server, where a client connects to.

From the connected Server, the programm receives Info-Lines, which are written in a txt-file, this is done in an extra class "tcpclient", and now the missing part is, that always when a new line is there (readyread), the textbrowser of the ui should refresh this data.

how do i make the connection?

the ui is initialisiated by

@Robbie20 w;
w.show();@

and i have a loadtextfile method

@void Robbie20::loadTextFile()
{
QDate date = QDate::currentDate();
QString datum = date.toString("yyyyMMdd");
QFile inputFile("c://LOGS/" + datum + ".txt");
inputFile.open(QIODevice::ReadOnly);

QTextStream in(&inputFile);
QString line = in.readAll();
inputFile.close();

ui->textBrowser->setPlainText(line);
QTextCursor cursor = ui->textBrowser->textCursor();
cursor.movePosition(QTextCursor::Start, QTextCursor::MoveAnchor, 1);

}
@

so how can i run this method from the class tcpclient, always, when the signal "readyread" occurs, in a way, the browserwindow in the "w" ui will be refreshed?

thanks for a hint.

here the tcpclient class:
@#include "tcpconnect.h"
#include "robbie20.h"

#include <QtDebug>
#include <QTcpSocket>
#include <QtGui/QApplication>

tcpconnect::tcpconnect(QObject *parent) :
QObject(parent)
{
}

void tcpconnect::Test()
{

socket = new QTcpSocket(this);
connect(socket,SIGNAL(connected()), this, SLOT(connected()));
connect(socket,SIGNAL(disconnected()), this, SLOT(disconnected()));
connect(socket,SIGNAL(readyRead()), this, SLOT(readyRead()));
connect(socket,SIGNAL(bytesWritten(qint64)), this, SLOT(bytesWritten(qint64)));


socket->connectToHost("192.168.2.10",2000);

        qDebug() << "Verbinde mit Robotersteuerung ....";

if(!socket->waitForConnected(3000))
{
    qDebug() << "not connected";

}

}

void tcpconnect::connected()
{
qDebug() << "Verbunden";
}

void tcpconnect::disconnected()
{
qDebug() << "disconnected";
}

void tcpconnect::bytesWritten(qint64 bytes)
{
qDebug() << "we wrote " << bytes ;
}

void tcpconnect::readyRead()
{
QDate date = QDate::currentDate();
QString datum = date.toString("yyyyMMdd");
QFile inputFile("c://LOGS/" + datum + ".txt");
inputFile.open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Append);
QTextStream out(&inputFile);
out << socket->readAll();
inputFile.close();

inputFile.open(QIODevice::ReadOnly);
QTextStream in(&inputFile);
QString line = in.readAll();
inputFile.close();
}
@

thanks.

roboterprogrammer

ps:

i tried to add this line in main.cpp, but its not working

@
QObject::connect(st.Test,SIGNAL(readyread()), w, SLOT(w.loadTextFile()));
@

this is whole main.cpp

@#include <QtGui/QApplication>
#include "robbie20.h"
#include "tcpconnect.h"
#include <QObject>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);

Robbie20 w;
w.show();

w.loadTextFile&#40;&#41;;

tcpconnect st;
st.Test(&#41;;

QObject::connect(st.Test,SIGNAL(readyread()), w, SLOT(w.loadTextFile&#40;&#41;&#41;);


return a.exec(&#41;;

}@

Zlatomir

What's rc180?

And you need to pass a pointer not an object, so take the address of w
@
QObject::connect(validPointerHere,SIGNAL(readyread()), &w, SLOT(w.loadTextFile())); //take the address with operator &
@

roboterprogrammer

hi,

thanks a lot for the fast reply!

okay now i can compile like this

@ QObject::connect(&st,SIGNAL(readyRead()), &w, SLOT(w.loadTextFile()));@

but i got an error during programm runtime, and its not updating the gui

@Object::connect: No such signal tcpconnect::readyRead() in ..\Robbie20\main.cpp:19
Object::connect: (receiver name: 'Robbie20')@

or more s.th. like
@ QObject::connect(st.socket->readyRead(),SIGNAL(readyRead()), &w, SLOT(w.loadTextFile()));

@
but then i get an error:

void qiodevice::readyread is protected
whitin this content

Zlatomir

Well readyRead seems it's a member function you defined:
@
void tcpconnect::readyRead()
{
QDate date = QDate::currentDate();
QString datum = date.toString("yyyyMMdd");
//...
@
And for a signal you don't provide an implementation, you just declare it and the moc will do the rest, read more in the "documentation":http://qt-project.org/doc/qt-4.8/signalsandslots.html

So maybe that from that function you want to emit a iReadSomeStuff signal (or do some refactoring and rename the method... whatever seems logic in your class design)

roboterprogrammer

ah i solved everything.
thanks

Zlatomir