Pickling objects

Question

I need to pickle object [wxpython frame object] and send it as a prameter to this function apply_async on multiproccessing pool module could someone provide me an example how c

Answer 1

You can not serialize a widget for use in another process. I guess you want to change the GUI content from another process that is started by the multiprocessing module. In that case, you should define a callback function in the parent process that gets called when the result of the sub-process is ready. Therefore you can use the "callback" parameter of apply_async.

Something like:

def fun(i):
    # do something in this sub-process and then return a log message
    return "finished doing something"

def cb(resultFromFun):
    wx.CallAfter(window.LogData, resultFromFun)

my_pool.apply_async(fun, [i], callback = cb)

Answer 2

I don't believe that wxPython objects can be pickled. They are just wrappers around C objects, which contain lots of pointers and other stateful stuff. The pickle module doesn't know enough about them to be able to restore their state afterwards.