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[RaiMan <rmhdevelop@xxxxxx>]

... and yes, I have changed a lot with observe:
>From the ChangeLog of 1.0.1

--- observe is reworked and options are added
- it is more verbose with higher debug levels

- it still stops observing after the first match (even in background
with FOREVER) (not for onChange())

- if you want to run it continually, use (except onChange())
event.repeat(seconds)
which will continue the observe after having waited the given seconds (e.g. to give time to the GUI for changes)

For all events: it is internally counted, how often the handler was visited, so it is now possible to decide in the handler wether to stop the observe after some time using e.g.
if event.getCount() > 10: event.stopObserver()
So there is no longer the need to stop the observation in the main script after some time.

... and yes: event.stopObserver() is now sufficient (instead of event.region.stopObserver() )
You still have to take care, to stop background observations at the end of the script (to be fixed with 1.1)

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https://bugs.launchpad.net/bugs/1212706

Title:
  [1.0.1] observe with onChange() does not work

Status in Sikuli:
  In Progress

Bug description:
  Hi,
  My environment is 
  windows xp + JRE 6 update 45
  I had test the code in official document
  def changed(event):
          print "something changed in ", event.region
          for ch in event.changes:
                  ch.highlight() # highlight all changes
          sleep(1)
          for ch in event.changes:
                  ch.highlight() # turn off the highlights
  with selectRegion("select a region to observe") as r:
      # any change in r larger than 50 pixels would trigger the changed function
      onChange(50, changed)
      observe(background=True)

  wait(30) # another way to observe for 30 seconds
  r.stopObserver()

  when I use old version of sikuli (1.0RC3)
  everything work fine,

  but when I use version 1.0.1
  will always get error message
  [error] script [ sikulitest ] stopped with error in line 11   <--observe(background=True)
  [error] java.lang.NullPointerException ( java.lang.NullPointerException )

  I also tried on windows 7 64 bit + JRE7
  have the same error,

  is it a bug in version 1.0.1

  or observe will be use in different way in  new version?

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