python and COM

[Brian Blais]

Hello,

I am trying to communicate to a Reuters feed using Python, using a particular set of
libraries called the Adfin Real Time library. I have VB code, and am trying to port
it to python, and admit I really do not understand COM objects and being a Linux guy
mainly, I don't use VB at all. I've had some marginal success, but am coming up
empty when it comes to setting up callbacks.

For example, this works:

import win32com.client
import time

symb='GOOG.O'

mylist=win32com .client.Dispatc h('AdfinXRTLib. AdxRtList')

mylist.Source=" IDN_RDF"
mylist.Register Items(symb,"ASK ")
mylist.StartUpd ates(4) # Mode Image

while mylist.ItemStat us(symb):
pass

for i in range(100):
m=mylist.Value( symb,"ASK")
print m
time.sleep(2)


but to get it to automatically updated quotes, in VB they do something like

#============== ==
Public Class Form1
# Dimension a Public Real Time list object that is capable of handling events
# note from me: not sure what this line does really
Dim WithEvents AdxList As New AdfinXRTLib.Adx RTList

Public Sub AdxList_OnUpdat e( <some args deleted>) Handles AdxList.OnUpdat e

do stuff with the updated data

End Sub

Private Sub Button1_Click(< some args deleted>)

do stuff with button click
End Sub
End Class
#============== ==

It seems as if the important part is the "Handles AdxList.OnUpdat e", which I assume
is basically saying "call me when AdxList.OnUpdat e is called". I have no idea how to
get this to point to a python function, so I can make the AdxList.OnUpdat e call
python code.

Is there a tutorial somewhere about this stuff, or is there a proper place to ask
such questions?


thanks,


Brian Blais

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

bblais@bryant.e du

http://web.bryant.edu/~bblais

[kyosohma@gmail.com]

Re: python and COM

On Apr 27, 2:50 pm, Brian Blais <bbl...@bryant. eduwrote:

Hello,
>
I am trying to communicate to a Reuters feed using Python, using a particular set of
libraries called the Adfin Real Time library. I have VB code, and am trying to port
it to python, and admit I really do not understand COM objects and being a Linux guy
mainly, I don't use VB at all. I've had some marginal success, but am coming up
empty when it comes to setting up callbacks.
>
For example, this works:
>
import win32com.client
import time
>
symb='GOOG.O'
>
mylist=win32com .client.Dispatc h('AdfinXRTLib. AdxRtList')
>
mylist.Source=" IDN_RDF"
mylist.Register Items(symb,"ASK ")
mylist.StartUpd ates(4) # Mode Image
>
while mylist.ItemStat us(symb):
pass
>
for i in range(100):
m=mylist.Value( symb,"ASK")
print m
time.sleep(2)
>
but to get it to automatically updated quotes, in VB they do something like
>
#============== ==
Public Class Form1
# Dimension a Public Real Time list object that is capable of handling events
# note from me: not sure what this line does really
Dim WithEvents AdxList As New AdfinXRTLib.Adx RTList
>
Public Sub AdxList_OnUpdat e( <some args deleted>) Handles AdxList.OnUpdat e
>
do stuff with the updated data
>
End Sub
>
Private Sub Button1_Click(< some args deleted>)
>
do stuff with button click
End Sub
End Class
#============== ==
>
It seems as if the important part is the "Handles AdxList.OnUpdat e", which I assume
is basically saying "call me when AdxList.OnUpdat e is called". I have no idea how to
get this to point to a python function, so I can make the AdxList.OnUpdat e call
python code.
>
Is there a tutorial somewhere about this stuff, or is there a proper place to ask
such questions?
>
thanks,
>
Brian Blais
>
--
-----------------
>
bbl...@bryant.e du
http://web.bryant.edu/~bblais

I found some info on Python, VB, and COM. Check out the links below:

http://vb2py.sourceforge.net/

http://mail.python.org/pipermail/python-list/2005-July/332502.html

http://www.oreilly.com/catalog/pytho...pter/ch12.html

http://mail.python.org/pipermail/melbourne-pug/2006-April/000132.html

Not sure if those will help, but they might give you some food for
thought.

Mike

[Larry Bates]

Re: python and COM

Brian Blais wrote:

Hello,
>
I am trying to communicate to a Reuters feed using Python, using a
particular set of libraries called the Adfin Real Time library. I have
VB code, and am trying to port it to python, and admit I really do not
understand COM objects and being a Linux guy mainly, I don't use VB at
all. I've had some marginal success, but am coming up empty when it
comes to setting up callbacks.
>
For example, this works:
>
import win32com.client
import time
>
symb='GOOG.O'
>
mylist=win32com .client.Dispatc h('AdfinXRTLib. AdxRtList')
>
mylist.Source=" IDN_RDF"
mylist.Register Items(symb,"ASK ")
mylist.StartUpd ates(4) # Mode Image
>
while mylist.ItemStat us(symb):
pass
>
for i in range(100):
m=mylist.Value( symb,"ASK")
print m
time.sleep(2)
>
>
but to get it to automatically updated quotes, in VB they do something like
>
#============== ==
Public Class Form1
# Dimension a Public Real Time list object that is capable of handling
events
# note from me: not sure what this line does really
Dim WithEvents AdxList As New AdfinXRTLib.Adx RTList
>
Public Sub AdxList_OnUpdat e( <some args deleted>) Handles
AdxList.OnUpdat e
>
do stuff with the updated data
>
End Sub
>
Private Sub Button1_Click(< some args deleted>)
>
do stuff with button click
End Sub
End Class
#============== ==
>
It seems as if the important part is the "Handles AdxList.OnUpdat e",
which I assume is basically saying "call me when AdxList.OnUpdat e is
called". I have no idea how to get this to point to a python function,
so I can make the AdxList.OnUpdat e call python code.
>
Is there a tutorial somewhere about this stuff, or is there a proper
place to ask such questions?
>
>
thanks,
>
>
Brian Blais
>

It looks like you are correct. This is a callback function that gets
called when the update occurs. The only coverage of this I've found is
in "Python Programming on Win32" but it is rather brief even there. I
have not any event driven callbacks, so I can't help all that much.
Normally you define a Python class that has methods that ADxList.OnUpdat e
is expecting to be able to call. Then depending on implementation you
either call it with an instance of that class or you may have to wrap
the instance in a COM IDispatch object by calling win32com.server .util.wrap()
around an instance of the function. Sorry I can't be more helpful.

-Larry