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Missing python27.dll on Win 7 64-bit

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David.Aldrich at EMEA

Jun 16, 2011, 8:26 AM

Post #1 of 7 (13781 views)
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Missing python27.dll on Win 7 64-bit

Hi

I am building a 32-bit C++ application using Visual C++ Express 2008 on 64-bit Windows 7. The application links to Python, so I installed 32-bit Python 2.7.2 by running python-2.7.2.msi.

When I run my app, I get error:

... python27.dll is missing from your computer ...

and, indeed, it is in neither C:\Windows\System32 nor C:\Windows\SysWOW64.

Please will someone suggest what I am doing wrong?

Best regards

David
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tjreedy at udel

Jun 16, 2011, 11:14 AM

Post #2 of 7 (13718 views)
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Re: Missing python27.dll on Win 7 64-bit [In reply to]

On 6/16/2011 12:44 PM, Dennis Lee Bieber wrote:
> On Thu, 16 Jun 2011 16:26:31 +0100, David Aldrich
> <David.Aldrich [at] EMEA> declaimed the following in
> gmane.comp.python.general:
>
>>
>> ... python27.dll is missing from your computer ...
>>
>> and, indeed, it is in neither C:\Windows\System32 nor C:\Windows\SysWOW64.
>>
> Didn't M$ decree, some years ago, that application specific DLLs (in
> this situation, Python is the application) should install in the
> application path, and NOT in any system path.
>
>> Please will someone suggest what I am doing wrong?
>>
> I find the corresponding DLL in
>
> e:\Python25\libs
>
> (I've started putting third party applications on the e: partition as my
> C: partition was getting too tight for defrag operations)... Oh,
> ActiveState Python 2.5 install here...

Python3.2, WinXP
All .dll and .pyd files in Python32/DLLs
libpython.a and .lib files in Python32/libs
there is one .lib for each .dll and .pyd.

>
> Most likely you need to put the Python libs directory into your
> system PATH (not PYTHONPATH) variable.

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Terry Jan Reedy

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David.Aldrich at EMEA

Jun 17, 2011, 12:13 AM

Post #3 of 7 (13711 views)
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Missing python27.dll on Win 7 64-bit [In reply to]

miki.tebeka at gmail

Jun 17, 2011, 7:50 AM

Post #4 of 7 (13707 views)
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Re: Missing python27.dll on Win 7 64-bit [In reply to]

I don't have Windows at hand, by I *guess* that the Python DLL is somewhere near the python executable. You need to make sure the Python DLL is in PATH, either copy it next to your executable or edit the PATH environment variable.
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miki.tebeka at gmail

Jun 17, 2011, 7:50 AM

Post #5 of 7 (13717 views)
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Re: Missing python27.dll on Win 7 64-bit [In reply to]

tshinnic at prismnet

Jun 17, 2011, 3:23 PM

Post #6 of 7 (13717 views)
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Re: Missing python27.dll on Win 7 64-bit [In reply to]

At 02:13 AM 6/17/2011, David Aldrich wrote:
>Hi
>
>I am building a 32-bit C++ application using Visual C++ Express 2008
>on 64-bit Windows 7. The application links to Python, so I
>installed 32-bit Python 2.7.2 by running python-2.7.2.msi.
>
>When I run my app, I get error:
>
>... python27.dll is missing from your computer ...
>
>and, indeed, it is in neither C:\Windows\System32 nor C:\Windows\SysWOW64.
>
>Please will someone suggest what I am doing wrong?

Maybe nothing, maybe something, too little information to know.

First, _look_ for the file. That is, find the file wherever it
is. Go to the command line and do

dir /s \ >allfiles.20110617a

Then look at that listing. WIth Python 2.7.2 which I just installed
the dll ends up in SysWOW64. And now I see that they are all there,
and nowhere else!

Directory of C:\Windows\SysWOW64
08/24/2010 07:47 PM 2,148,864 python26.dll
06/12/2011 03:09 PM 2,206,720 python27.dll
03/21/2010 01:43 AM 2,137,600 python31.dll
02/20/2011 10:29 PM 2,227,712 python32.dll

But in December they were in both places!

2010/11/23 21:42:42 2148864 /cygdrive/c/Windows/System32/python26.dll
2010/11/23 21:45:32 2286080 /cygdrive/c/Windows/System32/python27.dll
2010/11/16 20:16:31 2137600 /cygdrive/c/Windows/System32/python31.dll

2010/11/23 21:42:42 2148864 /cygdrive/c/Windows/SysWOW64/python26.dll
2010/11/23 21:45:32 2286080 /cygdrive/c/Windows/SysWOW64/python27.dll
2010/11/16 20:16:31 2137600 /cygdrive/c/Windows/SysWOW64/python31.dll

(Maybe something to do with the 32-bit vs. 64-bit installs
mis-direction? I use only the 32-bit now...)

Now, do another install of Python 2.7.2 on another machine. Do a
file listing. Where do the DLLs end up? Re-do the install on your
machine. Where do the DLLs end up?

Do some more checking and tell us what you've _found_ and where...

>Best regards
>
>David
>--
>http://mail.python.org/mailman/listinfo/python-list

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enleverLesX_XXmcX at XmclavXeauX

Jun 20, 2011, 11:09 PM

Post #7 of 7 (13705 views)
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Re: Missing python27.dll on Win 7 64-bit [In reply to]

Hi!

In my Win è 64 bits, python27.dll (and others DLLs like pythoncom27.dll,
pythoncomloader27.dll or pywintypes27.dll) are in C:\Windows\SysWOW64

And (my) Python 2.7.2 run perfectly.

@-salutations
--
Michel Claveau

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