将CStdioFile类扩展,读取UNICODE文本文件

   if (pszUnicodeString)
   {
    delete pszUnicodeString;
   }

   if (pszMultiByteString)
   {
    delete pszMultiByteString;
   }
  }
 }
#endif

 // Then remove end-of-line character if in Unicode text mode
 if (bReadData)
 {
  // Copied from FileTxt.cpp but adapted to Unicode and then adapted for end-of-line being just '\r'.
  nLen = rString.GetLength();
  if (nLen > 1 && rString.Mid(nLen-2) == sNEWLINE)
  {
   rString.GetBufferSetLength(nLen-2);
  }
  else
  {
   lpsz = rString.GetBuffer(0);
   if (nLen != 0 && (lpsz[nLen-1] == _T('\r') lpsz[nLen-1] == _T('\n')))
   {
    rString.GetBufferSetLength(nLen-1);
   }
  }
 }

 return bReadData;
}

// --------------------------------------------------------------------------------------------
//
// CStdioFileEx::WriteString()
//
// --------------------------------------------------------------------------------------------
// Returns:    void
// Parameters: LPCTSTR lpsz
//
// Purpose:  Writes string to file either in Unicode or multibyte, depending on whether the caller specified the
//     CStdioFileEx::modeWriteUnicode flag. Override of base class function.
// Notes:  If writing in Unicode we need to:
//      a) Write the Byte-order-mark at the beginning of the file
//      b) Write all strings in byte-mode
//     - If we were compiled in Unicode, we need to convert Unicode to multibyte if
//      we want to write in multibyte
//     - If we were compiled in multi-byte, we need to convert multibyte to Unicode if
//      we want to write in Unicode.
// Exceptions: None.
//
void CStdioFileEx::WriteString(LPCTSTR lpsz)
{
 // If writing Unicode and at the start of the file, need to write byte mark

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