Building a DLL with MinGW and loading it with Python's ctypes module -

i trying build c dll can loaded within python using ctypes.windll.loadlibrary(...)

i can create dll , client program in c work following mingw tutorial @ http://www.mingw.org/wiki/msvc_and_mingw_dlls.

when try load same dll within python error:

oserror: [winerrror 193] %1 not valid win32 application 

can give me idea doing incorrectly?

here files:

noise_dll.h

#ifndef noise_dll_h #define noise_dll_h  // declspec identify functions exported when  // building dll , imported when 'including' header client #ifdef building_noise_dll #define noise_dll __declspec(dllexport) #else #define noise_dll __declspec(dllimport) #endif  //this test function see if dll working // __stdcall => use ctypes.windll ... int __stdcall noise_dll hello(const char *s);  #endif  // noise_dll_h 

noise_dll.c

#include <stdio.h> #include "noise_dll.h"  __stdcall int hello(const char *s) {     printf("hello %s\n", s);     return 0; } 

i build dll with:

gcc -c -d building_noise_dll noise_dll.c gcc -shared -o noise_dll.dll noise_dll.o -wl,--out-implib,libnoise_dll.a 

the python code simply:

import ctypes my_dll = ctypes.windll.loadlibrary("noise_dll") 

and error above: '%1 not not valid win32 application'

i know dll not wrong, because if create client file:

noise_client.c

#include <stdio.h> #include "noise_dll.h"  int main(void) {     hello("dll");     return 0; } 

and build with:

gcc -c noise_client.c gcc -o noise_client.exe noise_client.o -l. -lnoise_dll 

i working executable. have understanding of of goes on in code, options , preprocessor directives above, still little fuzzy on how .dll file , .a file used. know if remove .a file can still build client, not sure purpose is. know is kind of archive format multiple object files

i can ctypes.windll.loadlibrary(...) ordinary windows dll found in windows/system32 without issue.

one final point: using 64 bit python 3.3. using version of mingw tat comes recommended installer (mingw-get-inst-20120426.exe). not sure if 32 bit, or if matters.

thanks!

use 32-bit python - dll wasn't compiled 64 bit code.