Binded C++ Class In DLL

it's a simple example about this error, and i still have no idea.....

---------------------------BINDDLL.h--------------------------
#ifndef BINDDLL_H
#define BINDDLL_H


#ifdef BINDDLL_EXPORTS
#define DLLEXPORT __declspec(dllexport)
#define DLLIMPORT __declspec(dllimport)
#else
#define DLLEXPORT
#define DLLIMPORT
#endif

struct lua_State;

bool DLLEXPORT Bind(lua_State* pState);

#endif

-------------------------------BINDDLL.cpp-------------------------------
-------------------------------just bind the BindTestClass
class----------------------------
#include "BindDLL.h"

#include <luabind/luabind.hpp>
#include <luabind/lua_include.hpp>
#include <luabind/operator.hpp>
#include <luabind/detail/convert_to_lua.hpp>
#include <luabind/iterator_policy.hpp>

class BindTestClass
{
public:
int GetA()
{
return a;
}
void SetA(int i)
{
a = i;
}
int a;
char str[10];
};


static luabind::object Getstr(BindTestClass &bindTestClass, lua_State *L)
{
return luabind::object(L, bindTestClass.str);
}

static void Setstr(BindTestClass &bindTestClass, luabind::argument const&
table)
{
strcpy_s(bindTestClass.str, 10, luabind::object_cast<const char*>(table));
}


bool DLLEXPORT Bind(lua_State* pState)
{
luabind::object g = luabind::globals(pState);

luabind::module(pState)
[
luabind::class_<BindTestClass>("BindTestClass")
.def(luabind::constructor<>())
.def_readwrite("a", &BindTestClass::a)
.property("str", Getstr, Setstr, luabind::raw(_2))
];

return true;

}

---------------------------------------LuaBindTestMain.cpp----------------------------------------------------
----------------------------------------1--------------------------------------------------------------------------------

#include "BindDLL.h"
#include <luabind/luabind.hpp>
#include <luabind/lua_include.hpp>
#include <luabind/operator.hpp>
#include <luabind/detail/convert_to_lua.hpp>
#include <luabind/iterator_policy.hpp>

class BindTestClass
{
public:
int GetA()
{
return a;
}
void SetA(int i)
{
a = i;
}
int a;
char str[10];
};

  static luabind::object Getstr(BindTestClass &bindTestClass, lua_State *L)
  {
  return luabind::object(L, bindTestClass.str);
  }

  static void Setstr(BindTestClass &bindTestClass, luabind::argument const&
table)
  {
  strcpy_s(bindTestClass.str, 10, luabind::object_cast<const char*>(table));
  }

void main()
{
lua_State *pL = lua_open();

luaL_openlibs(pL);
luabind::open(pL);
 luabind::object g = luabind::globals(pL);
  luabind::module(pL)
  [
  luabind::class_<BindTestClass>("BindTestClass")
  .def(luabind::constructor<>())
  .def_readwrite("a", &BindTestClass::a)
  .property("str", Getstr, Setstr, luabind::raw(_2))
  ];

//Bind(pL);

int iRet = luaL_dostring(pL,
"local obj = BindTestClass();"
"obj.str = \"aaa\";"
);

if (iRet != 0)
{
printf("luaL_dostring failed:%s", lua_tostring(pL, -1));
lua_pop(pL, 1);
}

}

---------------------------------------LuaBindTestMain.cpp----------------------------------------------------
----------------------------------------2--------------------------------------------------------------------------------

#include "BindDLL.h"
#include <luabind/luabind.hpp>
#include <luabind/lua_include.hpp>
#include <luabind/operator.hpp>
#include <luabind/detail/convert_to_lua.hpp>
#include <luabind/iterator_policy.hpp>

class BindTestClass
{
public:
int GetA()
{
return a;
}
void SetA(int i)
{
a = i;
}
int a;
char str[10];
};

void main()
{
lua_State *pL = lua_open();

luaL_openlibs(pL);
luabind::open(pL);

Bind(pL);

int iRet = luaL_dostring(pL,
"local obj = BindTestClass();"
"obj.str = \"aaa\";"
);

if (iRet != 0)
{
printf("luaL_dostring failed:%s", lua_tostring(pL, -1));
lua_pop(pL, 1);
}

}


------------------------------------------------------------------------------Code
end--------------------------------
BindDLL.h and BindDll.cpp is in the DLL project. and luaBindTestMain.cpp is
exe project's code file.

if i use the 1 LuaBindTestMain.cpp.  "obj.str = "aaa;"" will call the
 Setstr Function
and if i  use the 2 LuaBindTestMain.cpp, "obj.str = "aaa;"" won't call the
 Setstr Function


help please!

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