Re: DLL function loading issue

Here is an updated version of my code with typedef and the relative errors :

// --- myclass.h
typedef LPTSTR (__stdcall *FUNCT_LocGetString)(long);

class CARDLLWrapper
{
  private:
   static FUNCT_LocGetString LocGetString;
   static HINSTANCE m_hlibLoc;
   CString GetResStr(long Index);

  public:
   HINSTANCE InitializeLoc(CString DLLName);
   void TerminateLoc();
   CString STR(long);
};

// --- myclass.cpp
HINSTANCE CARDLLWrapper::InitializeLoc(CString DLLName)
{
  m_hlibLoc=LoadLibrary(DLLName);
  if (m_hlibLoc != NULL)
  {
   (FUNCT_LocGetString)LocGetString =
(FUNCT_LocGetString)GetProcAddress(m_hlibLoc, TEXT("GetString"));
   return m_hlibLoc;
  }
  else
  {
   return 0;
  }
}
CString CARDLLWrapper::GetResStr(long Index)
{
  CString strRes("");
  if (LocGetString!=NULL)
  {
   strRes = this->LocGetString(Index);
  }
  else
  {
   strRes = "No such function";
  }
  return strRes;
}
//------------------------------------------------------------------------------
CString CARDLLWrapper::STR(long Index)
{
  return (CString)(GetResStr(Index));
}

when i compile this code, i do not have any error or warning.
However, when i use this DLL wrapper class, as following i have some
mistakes :

CARDLLWrapper *dw = new CARDLLWrapper();
dw->InitializeLoc("frmwrk_lc.dll");
dw->STR(IDS_FW_MNU_FILE);
dw->TerminateLoc();
delete dw;

VC raises following errors :
CARDLLWrapper.obj : error LNK2001: unresolved external symbol "private:
static char * (__stdcall* CARDLLWrapper::LocGetString)(long)"
(?LocGetString@CARDLLWrapper@@0P6GPADJ@ZA)

CARDLLWrapper.obj : error LNK2001: unresolved external symbol "private:
static struct HINSTANCE__ * CARDLLWrapper::m_hlibLoc"
(?m_hlibLoc@CARDLLWrapper@@0PAUHINSTANCE__@@A)

it's true that they are declared as private, but public functions have
access to them... :-(

Al.

Abdo Haji-Ali wrote: