[python-win32] Problem using win32com.client.Dispatch on Win7 64bit

[Mark Hammond]

On 16/10/2010 6:23 AM, Eileen Wei wrote:
> Thanks Mark, that solved the problem. But I am wondering since 32bit
> Python and pywin32 work on 64bit machine, why do we need the 64bit
> version? - I have always thought that you need to install 64bit
> version on 64bit machines...

In practice, it is rare you need the 64bit version - only if you need 
access to >3/4 GB of memory, need to use existing 64bit COM objects, etc.

Cheers,

Mark

>
> -----Original Message----- From: Mark Hammond
> [mailto:skippy.hammond at gmail.com] Sent: October-14-10 5:10 PM To:
> Eileen Wei Cc: python-win32 at python.org Subject: Re: [python-win32]
> Problem using win32com.client.Dispatch on Win7 64bit
>
> On 15/10/2010 3:40 AM, Eileen Wei wrote:
>> Hi everyone,
>>
>> I am new to this group. I am not sure how to do search on the
>> archives so if my question is duplicate please forgive me J
>>
>> I have Python 2.7.amd64 and pywin32-214.win-amd64-py2.7 installed
>> on my Win7 64bit machine.
>>
>> I am trying to use a COM object (the source of the COM is in C++
>> and MFC) in my python script. I registered the dll and tried to
>> create a object and here is what I got:
> ...
>> Note that I was able to successfully creating the object in my
>> WinXP and Win7 32bit machine. So I am thinking the problem must be
>> related to 64bit somehow. How can I fix this?
>
> 64bit processes can't use 32bit COM objects (at least not in-proc -
> not sure about external) and I guess your COM object is 32 bit.
>
> The easiest answer is probably just to install the 32bit Python and
> 32bit pywin32 extensions - you can either leave or remove the 64bit
> version - they can co-exist happily...
>
> Cheers,
>
> Mark