[python-win32] Creating COM objects in a new process

[Wuping Xin]

This is related the COM instance model implemented on the COM server 
side, not on the client side.  Specifically,  in the start-up code of 
the COM server application, there should be a call to
CoRegisterClassObject(CLSID, pUnk, dwClsContext, flags, &dwRegister). 
The key point is the fourth parameter “flags”. It determines during 
run-time whether the COM server exe can be started as single instance or 
multiple instances.

See this MSDN for more details: 
https://learn.microsoft.com/en-us/windows/win32/api/combaseapi/nf-combaseapi-coregisterclassobject?redirectedfrom=MSDN

Bottom line, this depends on the COM server implementation, not 
something the client side can control.

Wuping

------ Original Message ------
>Date: Mon, 26 Feb 2024 20:12:29 +1100
>From: Aviv Bergman <bergmana at gmail.com>
>To: python-win32 at python.org
>Subject: [python-win32] Creating COM objects in a new process
>Message-ID: <394b0459-dd10-42fb-a1c9-2e70066eeb43 at gmail.com>
>Content-Type: text/plain; charset=UTF-8; format=flowed
>
>Hi
>
>
>I'm trying to create several COM objects, each in a new process, but it
>seems DispatchEx is reusing the existing COM server process, is there
>any way to force creating new objects in a new process?
>
>
>I'm using a python COM server,? minimal example attached
>
>Thanks
>Aviv
>
>---------
>
>import os
>import pythoncom
>
>class CTest:
>  ??? _reg_progid_ = "STO.test"
>  ??? _reg_clsid_ = "{13704826-80EC-4205-ADCE-ADBE5B741731}"
>  ??? _reg_clsctx_ = pythoncom.CLSCTX_LOCAL_SERVER
>  ??? _public_methods_ = ["test"]
>
>  ??? def __init__(self):
>  ??????? pass
>
>  ??? def test(self):
>  ??????? return "process = " + str(os.getpid())
>
>
>if __name__ == "__main__":
>  ??? import win32com.server.register
>  ??? win32com.server.register.UseCommandLine(CTest)
>
>
>  >>> import win32com.client
>  >>> o1 = win32com.client.DispatchEx("STO.test")
>  >>> o2 = win32com.client.DispatchEx("STO.test")
>  >>> o1.test()
>'process = 26764'
>  >>> o2.test()
>'process = 26764'
>  >>>
>
>
>------------------------------
>
>Message: 2
>Date: Mon, 26 Feb 2024 10:24:51 -0500
>From: Mark Hammond <mhammond at skippinet.com.au>
>To: Aviv Bergman <bergmana at gmail.com>, python-win32 at python.org
>Subject: Re: [python-win32] Creating COM objects in a new process
>Message-ID: <71e75e18-eb08-46e2-bfc9-316f7290cf70 at skippinet.com.au>
>Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
>I'm not aware of anything, other than arranging for the existing process
>to terminate.
>
>Cheers,
>
>Mark
>
>On 2024-02-26 4:12 a.m., Aviv Bergman wrote:
>>  Hi
>>
>>
>>  I'm trying to create several COM objects, each in a new process, but
>>  it seems DispatchEx is reusing the existing COM server process, is
>>  there any way to force creating new objects in a new process?
>>
>>
>>  I'm using a python COM server,? minimal example attached
>>
>>  Thanks
>>  Aviv
>>
>>  ---------
>>
>>  import os
>>  import pythoncom
>>
>>  class CTest:
>>  ??? _reg_progid_ = "STO.test"
>>  ??? _reg_clsid_ = "{13704826-80EC-4205-ADCE-ADBE5B741731}"
>>  ??? _reg_clsctx_ = pythoncom.CLSCTX_LOCAL_SERVER
>>  ??? _public_methods_ = ["test"]
>>
>>  ??? def __init__(self):
>>  ??????? pass
>>
>>  ??? def test(self):
>>  ??????? return "process = " + str(os.getpid())
>>
>>
>>  if __name__ == "__main__":
>>  ??? import win32com.server.register
>>  ??? win32com.server.register.UseCommandLine(CTest)
>>
>>
>>  >>> import win32com.client
>>  >>> o1 = win32com.client.DispatchEx("STO.test")
>>  >>> o2 = win32com.client.DispatchEx("STO.test")
>>  >>> o1.test()
>>  'process = 26764'
>>  >>> o2.test()
>>  'process = 26764'
>>  >>>
>>  _______________________________________________
>>  python-win32 mailing list
>>python-win32 at python.org
>>https://mail.python.org/mailman/listinfo/python-win32
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