Experimental Physics and
Industrial Control System

Matt Newville <[email protected]> · Thu, 23 Feb 2012 14:29:09 -0600

Hi Emmanuel,

On Thu, Feb 23, 2012 at 11:48 AM, Emmanuel Mayssat <[email protected]> wrote:
> Ian,
>
> It seems they are more and more people using Qt.... Great!
> We use pyqt here. Would love to be part of a collaboration to develop
> more...
> Do you have a pointer to your pyqt interface to epics?
>
> Regards,
> --
> Emmanuel

Sorry to jump into this tangent of the Qt conversation.  I have very
little experience with Qt, but a simple probe-like application (see
below) to connect Qt with Epics through python is remarkably simple.
I'd be happy to add  "epics-aware" Qt widgets to pyepics, but don't
know enough Qt to do this myself.

--Matt Newville

This is using pyside, tested on Windows only.

#!/usr/bin/env python
import epics
import sys
from PySide.QtGui import QWidget, QLabel, QLineEdit, QGridLayout, QApplication

class PVProbe(QWidget):
    def __init__(self, parent=None):
        QWidget.__init__(self, parent)

        name_label  = QLabel("PV Name:")
        self.pvname = QLineEdit()
        value_label = QLabel("PV Value:")
        self.value  = QLabel("    ")

        self.pvname.returnPressed.connect(self.onPVNameReturn)
        self.pv = None

        grid = QGridLayout()
        grid.addWidget(name_label,   0, 0)
        grid.addWidget(self.pvname,  0, 1)
        grid.addWidget(value_label,  1, 0)
        grid.addWidget(self.value,   1, 1)

        self.setLayout(grid)
        self.setWindowTitle("PySide PV Probe:")

    def onPVNameReturn(self):
        self.pv = epics.PV(self.pvname.text(), callback=self.onPVChange)

    def onPVChange(self, pvname=None, char_value=None, **kws):
        self.value.setText(char_value)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    probe = PVProbe()
    probe.show()
    sys.exit(app.exec_())

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System