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Obtains the current logical length of the file in bytes.

virtual ULONGLONG GetLength( ) const;

The length of the file.

CFile* pFile = NULL;
   // Constructing a CFile object with this override may throw
   // a CFile exception, and won't throw any other exceptions.
   // Calling CString::Format() may throw a CMemoryException,
   // so we have a catch block for such exceptions, too. Any
   // other exception types this function throws will be
   // routed to the calling function.
      pFile = new CFile(_T("C:\\WINDOWS\\SYSTEM.INI"),
         CFile::modeRead | CFile::shareDenyNone);
      ULONGLONG dwLength = pFile->GetLength();
      CString str;
      str.Format(_T("Your SYSTEM.INI file is %I64u bytes long."), dwLength);
   CATCH(CFileException, pEx)
      // Simply show an error message to the user.
   AND_CATCH(CMemoryException, pEx)
      // We can't recover from this memory exception, so we'll
      // just terminate the app without any cleanup. Normally, an
      // an application should do everything it possibly can to
      // clean up properly and _not_ call AfxAbort().
   // If an exception occurs in the CFile constructor,
   // the language will free the memory allocated by new
   // and will not complete the assignment to pFile.
   // Thus, our clean-up code needs to test for NULL.
   if (pFile != NULL)   {
      delete pFile;

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