cleaner app starting, new application settings class

camera.py

@@ -341,6 +341,15 @@ if __name__ == "__main__":
           exit(0)
       n += 1
   else:
+    def closeEvent(cam,evt):
+      print(args)
+      try:
+        pv=cam._pv['pic']
+        pv.clear_auto_monitor()  # disconnect PV monitor callback -> program exit faster.
+      except AttributeError:
+        _log.warning('disconnect PV callback failed.')
+
+
     class UIcamera(epics_cam):
 
       def __init__(self, prefix="ESB-MX-CAM"):
@@ -446,7 +455,7 @@ if __name__ == "__main__":
 
     ## Display the data and assign each frame a time value from 1.0 to 3.0
     cam = UIcamera(prefix=args.prefix)
-
+    win.closeEvent=lambda x:closeEvent(cam, x)
 
     #cam.set_binning(4,4)
     #cam.run()
@@ -470,3 +479,4 @@ if __name__ == "__main__":
     ## Start Qt event loop unless running in interactive mode.
     if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
         QtGui.QApplication.instance().exec_()
+