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Old 09-13-2011, 06:42 AM   #1
Registered: Sep 2011
Posts: 83

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how to convert .so file of linux as corresponding .dll in windows

im working on linux .so files i want this .so file to be compatible with windows that is i want to convert linux .so file to corresponding .dll file , i have written the code in portable manner. here is my linux code
__attribute__((dllexport)) double Mean(double,double);
__attribute__((dllexport)) void Display();

#ifdef __cplusplus

extern "C"
double Mean(double a,double b)
return (a+b)/2;

void Display()


#ifdef WIN32
#include <direct.h>
#include <windows.h>


#include <sys/types.h>
#include <dlfcn.h>
#include "pgm.h"

int main()
#ifdef WIN32
HINSTANCE lib_handle;
void *lib_handl;

double (*func)(double,double);
void (*func1)();

#ifdef WIN32
lib_handle = LoadLibrary("");
if (!lib_handle)
printf("cannot able to load so library");
lib_handl = dlopen("",RTLD_LAZY);
if (!lib_handl)
printf("cannot able to load so library");

#ifdef WIN32
func f1=(func)GetProcAddress(lib_handle,"Mean");
double d =f1(4.6,5.4);
printf("\nmean %f\n",d);

func1 f2=(func1)GetProcAddress(lib_handle,"Display");

func =dlsym(lib_handl,"Mean");
const char* dlsym_error = dlerror();
if (dlsym_error)
printf("cant able to load mean");
double d =func(4.6,5.4);
printf("mean %f",d);

func1 =dlsym(lib_handl,"Display");

#ifdef WIN32
return 0;

finally i have created soname,realname,linker name as
now i have copied and renamed it as libpgm.dll and pasted in path of client program(i.e in windows) now im trying to execute it but im getting error as bad image check your installation diskette(similarly i copied all .so file one by one and renamed and i tried to compile on windows the same error i got),but the same code as executed sucessfuly in linux, plz let me knw the solution


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Old 09-14-2011, 05:05 PM   #2
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Registered: Sep 2004
Distribution: FreeBSD 9.1, Kubuntu 12.10
Posts: 3,078

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You need to compile it with Windows as the target. To do that you either need to compile it from Windows or use a cross-compiler.
Kevin Barry
Old 09-14-2011, 08:09 PM   #3
John VV
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Registered: Aug 2005
Location: A2 area Mi.
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on the windows machine run Mingw the default compiler is gcc 3.4 ( a old beta 4.1 in on sourceforge GnuWin32 )
and build it in mingw
first the *.so/*.la & .def then with dlltool convert it to a win dll
( it has been a few years since i have done that so...)


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