pyall.py 文件源码

def read(self):
        self.fileptr.seek(self.offset, 0)
        rec_fmt = '=LBBHLLHHLLBBH'
        rec_len = struct.calcsize(rec_fmt)
        rec_unpack = struct.Struct(rec_fmt).unpack
        # bytesRead = rec_len
        s = rec_unpack(self.fileptr.read(rec_len))

        # self.numberOfBytes   = s[0]
        self.STX             = s[1]
        self.typeOfDatagram  = chr(s[2])
        self.EMModel         = s[3]
        self.RecordDate      = s[4]
        self.Time            = float(s[5]/1000.0)
        self.ClockCounter    = s[6]
        self.SerialNumber    = s[7]

        self.ExternalDate       = s[8]
        self.ExternalTime       = s[9]
        self.PPS                = s[10]
        self.ETX                = s[11]
        self.checksum           = s[12]


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