FIX: ATL Servers Do Not Unregister Their Type Library

RESOLUTION

Add the code below to each type of ATL server to make sure registry entries are removed.

In-Process Server

For an In-Process server, add the call UnRegisterTypeLib() to DllUnregisterServer():

STDAPI DllUnregisterServer(void)
{
   HRESULT hr = _Module.UnregisterServer();
   if (FAILED(hr))
      return hr;

#if _WIN32_WINNT >= 0x0400
   hr = UnRegisterTypeLib(LIBID_<ProjName>Lib, 1, 0,
      LOCALE_NEUTRAL, SYS_WIN32);
#endif
   return hr;
}
				

Local Server

For a local server, add the call to UnRegisterTypeLib() to WinMain():

extern "C" int WINAPI _tWinMain(HINSTANCE hInstance,
   HINSTANCE /*hPrevInstance*/, LPTSTR lpCmdLine, int /*nShowCmd*/)
{
   ...
   ...
   while (lpszToken != NULL)
   {
      if (lstrcmpi(lpszToken, _T("UnregServer"))==0)
      {
         bRun = FALSE;
         _Module.UpdateRegistryFromResource(IDR_<ProjName>, FALSE);
         nRet = _Module.UnregisterServer();
         if (FAILED(nRet))
            break;

#if _WIN32_WINNT >= 0x0400
         nRet = UnRegisterTypeLib(LIBID_<ProjName>Lib, 1, 0,
            LOCALE_NEUTRAL,SYS_WIN32);
#endif
         break;
      }
      ...
      ...
   }
   ...
   ...
}
				

Service

For a service, add the call to UnRegisterTypeLib() to WinMain():

extern "C" int WINAPI _tWinMain(HINSTANCE hInstance,
   HINSTANCE /*hPrevInstance*/, LPTSTR lpCmdLine, int /*nShowCmd*/)
{
   ...
   while (lpszToken != NULL)
   {
      if (lstrcmpi(lpszToken, _T("UnregServer"))==0)
      {
         int nRet = _Module.UnregisterServer();
         if (FAILED(nRet))
            return nRet;

#if _WIN32_WINNT >= 0x0400
         return UnRegisterTypeLib(LIBID_<ProjName>Lib, 1, 0,
            LOCALE_NEUTRAL, SYS_WIN32);
#endif
      }
      ...
      ...
   }
   ...
   ...
}
				

NOTE: UnRegisterTypeLib() is exported only by the newer version of Oleaut32.dll shipped with Windows NT 4.0, Windows 95 with DCOM, and Internet Explorer 3.x.

NOTE: Make sure the LCID and major and minor version numbers passed as parameters to UnRegisterTypeLib() are the same as that specified in the project .idl file. No lcid attribute in the .idl file implies LOCALE_NEUTRAL.