Experimental Physics and
Industrial Control System

[email protected] · Thu, 24 Mar 2011 18:21:02 -0700

On 09:31 Tue 22 Mar     , Andrew Rhyder wrote:
> There is not much wrong with your code below, but I believe you always need to create widgets like QLabels (our EPICS flavor or otherwise) within a main window widget.

No need of main window 
or layout
or "how to use Qt" book. ;-)

> Also, the CA connection is not established automatically, you have to call the 'activate()' method once the widget is created.

Ok, that was the missing part

#include <QApplication>
#include <QCaLabel.h>
int main(int argc, char *argv[])
{
  QApplication a(argc, argv);
  QCaLabel label("DMC2183:1:DscrptnSI");
  label.activate();
  label.show();
  return a.exec();
}

> Calling 'activate()' is a minor overhead that I would like to avoid for simple widgets that could otherwise just 'go' but allows for widgets that take multiple PVs and then require macro substitution to be applied to those PVs.

I love the ASgui utility
The documentation is quite good to get you started (once you find and read it ;)
I would love to see more advanced widgets.
Overall this ca_framework is...
... awesome!
-- 
Emmanuel

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System