docs: def ReadDataFile(self):
          """
          Reads the contents of the Comtrade .dat file and store them in a
          private variable.
          
          For accessing a specific channel data, see methods getAnalogData and
          getDigitalData.
          """
          if os.path.isfile(self.filename[0:-4] + '.dat'):
              filename = self.filename[0:-4] + '.dat'
      
          elif os.path.isfile(self.filename[0:-4] + '.DAT'):
              filename = self.filename[0:-4] + '.DAT'
          
          else:
              print "Data file File not found."
              return 0
          
          self.filehandler = open(filename,'rb')
          self.DatFileContent = self.filehandler.read()
      
          # END READING .dat FILE.
          self.filehandler.close() # Close file.        
          
          return 1