[Mingw-users] Create a MinGW DLL to use with MSVC++

[yazan w. <ya...@ya...>]

Hello everyone,
I'm new to DLL coding, so this may be simple problem,
I've written few C++ functions with MinGW, and I've tried to make a .dll and .lib of them to use it with msvc, i built it as a shared library, using the following commands

g++ -c -DBUILD_DLL testdll.cpp
g++ -shared -o testdll.dll testdll.o -Wl,--output-def,testdll.def,--out-implib,libtestdll.a

//CREATE A LIB FOR MSVC
lib /machine:i386 /def:testdll.def

//COMPILE IT USING COMMAND LINE
CL MAIN.CPP TESTDLL.LIB

to here, everything works fine, and I have a main.exe, but the problem is when I'm trying to run main.exe, I get run-time error, and sometimes I don't get run time errors, but it also does not work write,

this is sample of my .h file 
////####################################
#ifndef  _DLL_H_
#define _DLL_H_

#include<vector>
#include<string>
using std::vector;
using std::string;

#ifdef __cplusplus
extern "C" {
#endif

#if BUILDING_DLL
# define EXPORT __declspec (dllexport)
#else /* Not BUILDING_DLL */
# define EXPORT __declspec (dllimport)
#endif /* Not BUILDING_DLL */


//some global vraiables,
//define error vlaues
#define SUCCESS_     0  // 0 = success
#define EACCESS_    -1  //-1 = access denied

#ifdef _WIN32
    const char sep = '\\';
#else
    const char sep = '/';
#endif

struct error_filename
{
    string filename;
    int errorcode;
};

EXPORT  extern bool same_device;

int __stdcall  EXPORT copy_file(const char* src, const char* dst);
int __stdcall  EXPORT move_dir_ignore_errors(const char* src, const char*dst, vector<error_filename>& filenames);
....
////####################################
There is a standard C++ code in the implementation file ( .cpp ), and I can also provide it if anyone is interested, 
does there is any problem declaring the struct that way, or is it ok, if anyone has any suggestion, I would be happy to hear them

Thankx very much,






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