C / C++ / MFC

DWORD attrib = GetFileAttributes(szPath);
if (attrib != (DWORD)-1 && attrib & FILE_ATTRIBUTE_DIRECTORY)

//! Checks whether a directory exists.
//! @param  strDirectory  Directory
//! @return true if the directory exists, false otherwise.
bool dirExists
  (CString strDirectory)
{
  // Create full directory specification - return if unable
  TCHAR* fullPath = _tfullpath (NULL, strDirectory, 0);
  if (fullPath == NULL)
     return (false);
 
  // Check if directory exists by trying to make it the default directory
  TCHAR szCurrDir [_MAX_PATH];
  _tgetcwd (szCurrDir, _MAX_PATH - 1);
  long nStatus = _tchdir (fullPath);
  _tchdir (szCurrDir);
  
  // Return
  free (fullPath);    
  if (nStatus == 0)
     return (true);
  return (false);
}