IronPython and COM Interface

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  • Divya
    #1

    IronPython and COM Interface

    Hello,

    I'm new to IronPython and COM so please bear with me.

    I have a COM interface provided to me. I need to implement this
    interface and pass it to a method as a way of implementing
    'callbacks'.

    However it appears that the methods of my interface object are never
    called.

    As a alternative, I implemented the interface in C# and then extended
    the C# class in IronPython. However, on running the code, methods of
    my C# class rather than the IronPython class are being called.

    Can anyone advise? Is this possible in IronPython?

    The code is listed below.

    Regards,
    Divya

    ---------------------------

    import time

    import clr
    clr.AddReferenc e('Interop.MBTC OMLib.dll')
    clr.AddReferenc e('Interop.MBTO RDERSLib.dll')
    clr.AddReferenc e('Interop.MBTQ UOTELib.dll')

    import MBTCOMLib
    import MBTORDERSLib
    import MBTQUOTELib

    demo_user='user '
    demo_pass='pass '
    demo_host=9

    class MBEvents(MBTQUO TELib.IMbtQuote sNotify):
    def __init__(self):
    MBTQUOTELib.IMb tQuotesNotify._ _init__(self)

    def OnLevel2Data(da ta):
    print 'OnLevel2Data'

    def OnOptionsData(s elf, data):
    print 'OnOptionsData'

    def OnQuoteData(sel f, data):
    print 'OnQuoteData'

    def OnTSData(self, data):
    print 'OnTSData'

    class MB:
    def __init__(self):
    self.conn = MBTCOMLib.MbtCo mMgrClass()
    #self.conn.Enab leSplash(False)
    self.orders = self.conn.Order Client
    self.quotes = self.conn.Quote s
    self.events = MBEvents()

    def login(self, host=demo_host, user=demo_user, passwd=demo_pas s):
    self.conn.DoLog in(host, user, passwd, '')
    print self.quotes.Rem oteAddress, self.quotes.Rem otePort
    self.quotes.Adv iseSymbol(self. events, 'EUR/USD', 1|2|3|4)

    Tags: None
    • Larry Bates
      #2
      Re: IronPython and COM Interface

      Divya wrote:
      Hello,
      >
      I'm new to IronPython and COM so please bear with me.
      >
      I have a COM interface provided to me. I need to implement this
      interface and pass it to a method as a way of implementing
      'callbacks'.
      >
      However it appears that the methods of my interface object are never
      called.
      >
      As a alternative, I implemented the interface in C# and then extended
      the C# class in IronPython. However, on running the code, methods of
      my C# class rather than the IronPython class are being called.
      >
      Can anyone advise? Is this possible in IronPython?
      >
      The code is listed below.
      >
      Regards,
      Divya
      >
      ---------------------------
      >
      import time
      >
      import clr
      clr.AddReferenc e('Interop.MBTC OMLib.dll')
      clr.AddReferenc e('Interop.MBTO RDERSLib.dll')
      clr.AddReferenc e('Interop.MBTQ UOTELib.dll')
      >
      import MBTCOMLib
      import MBTORDERSLib
      import MBTQUOTELib
      >
      demo_user='user '
      demo_pass='pass '
      demo_host=9
      >
      class MBEvents(MBTQUO TELib.IMbtQuote sNotify):
      def __init__(self):
      MBTQUOTELib.IMb tQuotesNotify._ _init__(self)
      >
      def OnLevel2Data(da ta):
      print 'OnLevel2Data'
      >
      def OnOptionsData(s elf, data):
      print 'OnOptionsData'
      >
      def OnQuoteData(sel f, data):
      print 'OnQuoteData'
      >
      def OnTSData(self, data):
      print 'OnTSData'
      >
      class MB:
      def __init__(self):
      self.conn = MBTCOMLib.MbtCo mMgrClass()
      #self.conn.Enab leSplash(False)
      self.orders = self.conn.Order Client
      self.quotes = self.conn.Quote s
      self.events = MBEvents()
      >
      def login(self, host=demo_host, user=demo_user, passwd=demo_pas s):
      self.conn.DoLog in(host, user, passwd, '')
      print self.quotes.Rem oteAddress, self.quotes.Rem otePort
      self.quotes.Adv iseSymbol(self. events, 'EUR/USD', 1|2|3|4)
      >
      It may not help but I was struggling with the COM-callback issue
      yesterday and found that this works in regular python:

      import win32com.server .util

      def callback:
      _public_methods _=['progress']
      def progress(self, total, number):
      print "completed %i of %i" % (number, total)

      #
      # Get instance of callback class
      #
      cb=callback()
      #
      # Wrap the callback class to turn it into an IDispatch (COM) object
      # so I can pass it to my COM object.
      #
      idCallback=win3 2com.server.uti l.wrap(cb)
      #
      # Call the COM interface and pass it the callback function
      #
      r=oC.WSset_call back(idCallback )

      In my case the COM object was also written in Python so to get
      to the python object I do following:

      def WSset_callback( idCallback)
      self.callback=w in32com.client. Dispatch(idCall back)

      Now I can call .progress method of callback class from the COM
      object.

      self.callback.p rogress(total, number)

      Hope this helps in some way.

      -Larry

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