# Publishing/Subscribing from/to Qt GUI to ROS

Hi,

I am working on qt based GUI tool that I found in ROS wiki. As I understand, this package provides the basic requirement to interface Qt to ROS by means of a QNode class (a Thread). This package template, publishes chatter topic by means of the QNode Thread, using the run method. so my question is, how can one publish/subscribe values from Qt elements like a qSlider, qButton, qLineEdit, qProgressBar... etc to ROS? I am not very familiar with Thread programming, How can I pass these values to the QNode Thread...? PFB is portion of code to get an Idea:

    /*********************
** Logging
**********************/
ui.view_logging->setModel(qnode.loggingModel());
QObject::connect(&qnode, SIGNAL(loggingUpdated()), this, SLOT(updateLoggingView()));

/*********************
** Auto Start
**********************/
if ( ui.checkbox_remember_settings->isChecked() ) {
on_button_connect_clicked(true);
}

/*********************
**


Values That I need to publish

**********************/
ui.linearVelprogressBar->setValue(ui.linearVelhorizontalSlider->value());
ui.angularVelprogressBar->setValue(ui.angularVeldial->value());

connect(ui.linearVelhorizontalSlider,SIGNAL(valueChanged(int)),ui.linearVelprogressBar,SLOT(setValue(int)));
connect(ui.angularVeldial,SIGNAL(valueChanged(int)),ui.angularVelprogressBar,SLOT(setValue(int)));


here is sample GUI...

If anyone has worked on this, Please give me an Idea to perform the above... Thanks in advance.

Murali

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