[issue26006] 32 bits python ctypes creates 64 bits process from 32 bits executable

[Artur Korobeynyk]

New submission from Artur Korobeynyk:

Hi,

I have a 32 bits python on 64 bits Windows and 32 bits executable (compiled 
from native C).
When I do kernel32.CreateProcessA(path_to_exe, ...) python creates a process 
which is 64 bit (ctypes IsWow64Process returns true).
I expect it to be 32 as well. Am I wrong or that is a bug?

I attached testprog.exe but it requires testdll.dll
The sources of testprog.c:

#include 
#include 

int main()
{

Sleep(15000);
printf("%d", testSum(5,10));
return 0;
}

testdll.c

#include 

__declspec(dllexport) int __cdecl testSum(int a, int b)
{
return(a+b);
}

compiled as:
/usr/bin/i686-pc-mingw32-gcc.exe -c testdll.c
/usr/bin/i686-pc-mingw32-gcc.exe --shared -o testdll.dll testdll.o
/usr/bin/i686-pc-mingw32-gcc.exe -o testprog testprog.c -L. -ltestdll

Process creation:
if kernel32.CreateProcessA(path_to_exe,
   None,
   None,
   None,
   None,
   creation_flags,
   None,
   None,
   byref(startupinfo),
   byref(process_information))

--
components: ctypes
files: testprog.exe
messages: 257461
nosy: Artur Korobeynyk
priority: normal
severity: normal
status: open
title: 32 bits python ctypes creates 64 bits process from 32 bits executable
versions: Python 2.7
Added file: http://bugs.python.org/file41492/testprog.exe

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[issue26006] 32 bits python ctypes creates 64 bits process from 32 bits executable

[Artur Korobeynyk]

Artur Korobeynyk added the comment:

the Wow64Process output parameter is true for a 32-bit process. WOW64 is short 
for Win32 running on Win64 (i.e. the environment used to run 32-bit programs in 
64-bit Windows). Even a 32-bit WOW64 process has some 64-bit modules, such as 
ntdll.dll, wow64.dll, wow64win.dll, and wow64cpu.dll

--
resolution:  -> not a bug
status: open -> closed

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