TCHAR tcScriptName[MAX_PATH];
tcScriptName = "filename";
size_t i;
  char tmp[MAX_PATH];
  mbstate_t       mbstate;

  // Reset to initial shift state
  ::memset((void*)&mbstate, 0, sizeof(mbstate));

  const wchar_t* wt = tcScriptName;
  wcsrtombs_s(&i, tmp, MAX_PATH, &wt, MAX_PATH,&mbstate);


////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////


char * input = null;
wchar_t wc_input[MAX_USERNAME_LEN] = L"test";

  int nLen = WideCharToMultiByte( CP_ACP, 0, wc_input, -1, NULL, 0, NULL, NULL );
  int i = wcslen(wc_input)*sizeof(wchar_t);
  input = (char*)realloc(input,i+1);
  if (!input)
  {
   free(input);
   input = (char*)malloc(i + 1);
  }
  WideCharToMultiByte( CP_ACP, 0, wc_input, -1, input, nLen, NULL, NULL );