python 读取blob

        for num in range(76802):
            # if num == 0:
            #     c[num] = imagedata[0:4]
            #     d[num] = struct.unpack('i', c[num])
            # elif num == 1:
            #     c[num] = imagedata[4:8]
            #     d[num] = struct.unpack('i', c[num])
            # else:
            #     c[num] = imagedata[8:12]
                # c[num] = imagedata[10:12]
                # d[num] = struct.unpack('4s', c[num])
                #c[num] = imagedata[(num-1)*2+6:(num-1)*2+10]
            if num == 3 :
                c[num] = imagedata[1000:1002]
                d[num] = struct.unpack('h', c[num])
                print(c[num])
                print(d[num])

 imageData即blob类型。

利用struct包的unpack方法。其中参数参照下表：