将CStdioFile类扩展,读取UNICODE文本文件

protected:
 UINT ProcessFlags(const CString& sFilePath, UINT& nOpenFlags);

 bool  m_bIsUnicodeText;
 UINT  m_nFlags;
};

实现文件如下：

/*static*/ const UINT CStdioFileEx::modeWriteUnicode = 0x20000; // Add this flag to write in Unicode

CStdioFileEx::CStdioFileEx(): CStdioFile()
{
 m_bIsUnicodeText = false;
}

CStdioFileEx::CStdioFileEx(LPCTSTR lpszFileName,UINT nOpenFlags)
 :CStdioFile(lpszFileName, ProcessFlags(lpszFileName, nOpenFlags))
{
}

BOOL CStdioFileEx::Open(LPCTSTR lpszFileName,UINT nOpenFlags,CFileException* pError /*=NULL*/)
{
 // Process any Unicode stuff
 ProcessFlags(lpszFileName, nOpenFlags);

 return CStdioFile::Open(lpszFileName, nOpenFlags, pError);
}

BOOL CStdioFileEx::ReadString(CString& rString)
{
 const int nMAX_LINE_CHARS = 4096;
 BOOL   bReadData;
 LPTSTR  lpsz;
 int   nLen = 0; //, nMultiByteBufferLength = 0, nChars = 0;
 CString  sTemp;
 wchar_t*  pszUnicodeString = NULL;
 char *  pszMultiByteString= NULL;

 // If at position 0, discard byte-order mark before reading
 if (!m_pStream (GetPosition() == 0 && m_bIsUnicodeText))
 {
  wchar_t cDummy;
//  Read(&cDummy, sizeof(_TCHAR));
  Read(&cDummy, sizeof(wchar_t));
 }

// If compiled for Unicode
#ifdef _UNICODE
 // Do standard stuff -- both ANSI and Unicode cases seem to work OK
 bReadData = CStdioFile::ReadString(rString);
#else

 if (!m_bIsUnicodeText)
 {
  // Do standard stuff -- read ANSI in ANSI
  bReadData = CStdioFile::ReadString(rString);
 }
 else
 {
  pszUnicodeString = new wchar_t[nMAX_LINE_CHARS];
  pszMultiByteString= new char[nMAX_LINE_CHARS]; 

  // Read as Unicode, convert to ANSI

  if(fgetws(pszUnicodeString, nMAX_LINE_CHARS, m_pStream)==NULL)
  {  
   bReadData=FALSE;
  }
  else
  {
   bReadData=TRUE;
   if (GetMultiByteStringFromUnicodeString(pszUnicodeString, pszMultiByteString, nMAX_LINE_CHARS))

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