excel - Marshaling COM objects between Python processes using pythoncom -


i'm hoping can me being able make marshaled cross-process call excel python.

i have excel session initiated via python know , running when needs accessed separate python process. have got working desired using marshaling comarshalinterfaceinstream() , cogetinterfaceandreleasestream() calls pythoncom module, need repeat access stream (which can set once in case), , cogetinterfaceandreleasestream() allows once-only access interface.

i believe achieve can done createstreamonhglobal(), comarshalinterface() , counmarshalinterface() unable working, because not passing in correct parameters.

rather describe in detail main scenario, have set simple example program follows - takes place in same process 1 step @ time! following snippet works fine:

import win32com.client import pythoncom  excelapp = win32com.client.dispatchex("excel.application")  marshalledexcelapp = pythoncom.comarshalinterthreadinterfaceinstream(pythoncom.iid_idispatch, excelapp)  xlapp = win32com.client.dispatch(                                 pythoncom.cogetinterfaceandreleasestream(marshalledexcelapp, pythoncom.iid_idispatch))  xlwb = xlapp.workbooks.add() xlws = xlwb.worksheets.add() xlws.range("a1").value = "aaa"

however, when try following:

import win32com.client import pythoncom  excelapp = win32com.client.dispatchex("excel.application")  mystream = pythoncom.createstreamonhglobal()                                    pythoncom.comarshalinterface(mystream,                              pythoncom.iid_idispatch,                              excelapp,                              pythoncom.mshctx_local,                              pythoncom.mshlflags_tablestrong)     myunmarshaledinterface = pythoncom.counmarshalinterface(mystream, pythoncom.iid_idispatch)

i error (which imagine related 3rd parameter) when making call pythoncom.comarshalinterface():

"valueerror: argument not com object (got type=instance)"

does know how can simple example working?

thanks in advance

after angst, have managed resolve issue facing, , indeed subsequent ones describe.

first, correct in guessing initial problem 3rd parameter in call pythoncom.comarshalinterface(). in fact, should have been making reference oleobj property of excelapp variable:

pythoncom.comarshalinterface(mystream,                               pythoncom.iid_idispatch,                               excelapp._oleobj_,                               pythoncom.mshctx_local,                               pythoncom.mshlflags_tablestrong)

however, faced different error message, time in call pythoncom.counmarshalinterface():

com_error: (-2147287010, 'a disk error occurred during read operation.', none, none)

it turned out due fact stream pointer needs reset prior use, seek() method:

mystream.seek(0,0)

finally, although aspects working correctly, found despite using quit() on marshalled excel object , explicitly setting variables none prior end of code, left zombie excel process. despite fact pythoncom._getinterfacecount() returning 0.

it turns out had explicitly empty stream had created call coreleasemarshaldata() (having first reset stream pointer again). so, example code snippet in entirety looks this:

import win32com.client import pythoncom  pythoncom.coinitialize()  excelapp = win32com.client.dispatchex("excel.application")  mystream = pythoncom.createstreamonhglobal()     pythoncom.comarshalinterface(mystream,                               pythoncom.iid_idispatch,                               excelapp._oleobj_,                               pythoncom.mshctx_local,                               pythoncom.mshlflags_tablestrong)      excelapp = none  mystream.seek(0,0) myunmarshaledinterface = pythoncom.counmarshalinterface(mystream, pythoncom.iid_idispatch)     unmarshalledexcelapp = win32com.client.dispatch(myunmarshaledinterface)  # stuff in excel in order prove marshalling has worked.  unmarshalledexcelapp.visible = true xlwbs = unmarshalledexcelapp.workbooks xlwb = xlwbs.add() xlwss = xlwb.worksheets xlws = xlwss.add() xlrange = xlws.range("a1") xlrange.value = "aaa" unmarshalledexcelapp.quit()      # clear stream have finished mystream.seek(0,0) pythoncom.coreleasemarshaldata(mystream)  xlrange = none xlws = none xlwss = none xlwb = none xlwbs = none myunmarshaledinterface = none unmarshalledexcelapp = none mystream = none  pythoncom.couninitialize()

i hope helps else out there overcome obstacles faced!


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