Question

使用我的代码时出现以下错误。我的代码的目标是创建一个类，将整数输入转换为二进制数据以进行套接字消息传递。我正在尝试了解这个应用程序的打包和解包。任何帮助表示赞赏。

代码：

import struct

def BinaryPacker(input1):
    s = struct.Struct('@I')
    pack_data = s.pack(int(input1))
    print 'Original values:', input1
    print 'Format string  :', s.format
    print 'Uses           :', s.size, 'bytes'
    return pack_data

#BinaryUnpacker unpacks the data with small discrepancy in floating point value
def BinaryUnpacker(input2):
    s = struct.Struct('@I')
    print input2
    print 'Size of struct: ', struct.calcsize(input2)
    unpack_data = s.unpack(input2)
    print 'Unpacked Values:', unpack_data
    print unpack_data[0]
    print '\n'

while True:
    print ("Message to pack n unpack:")
    message = raw_input() 
    message = BinaryPacker(message)
    BinaryUnpacker(message)

错误1：出于某种原因，使用小数字＆lt; 10似乎被解释为char而不是字符串，尽管9似乎有效。

Message to pack n unpack:
5
Original values: 5
Format string  : @I
Uses           : 4 bytes

Size of struct:
Traceback (most recent call last):
  File "C:\PythonPractice\BinaryPacker.py", line 43, in <module>
    BinaryUnpacker(message)
  File "C:\PythonPractice\BinaryPacker.py", line 33, in BinaryUnpacker
    print 'Size of struct: ', struct.calcsize(input2)
struct.error: bad char in struct format

错误2：如果我尝试将input2转换为整数，则会出现文字错误。

C:\PythonPractice>BinaryPacker.py
Message to pack n unpack:
9
Original values: 9
Format string  : @I
Uses           : 4 bytes

Size of struct:
Traceback (most recent call last):
  File "C:\PythonPractice\BinaryPacker.py", line 43, in <module>
    BinaryUnpacker(message)
  File "C:\PythonPractice\BinaryPacker.py", line 33, in BinaryUnpacker
    print 'Size of struct: ', struct.calcsize(int(input2))
ValueError: invalid literal for int() with base 10: ''

C:\PythonPractice>BinaryPacker.py
Message to pack n unpack:
10
Original values: 10
Format string  : @I
Uses           : 4 bytes


Size of struct:
Traceback (most recent call last):
  File "C:\PythonPractice\BinaryPacker.py", line 43, in <module>
    BinaryUnpacker(message)
  File "C:\PythonPractice\BinaryPacker.py", line 33, in BinaryUnpacker
    print 'Size of struct: ', struct.calcsize(int(input2))
ValueError: invalid literal for int() with base 10: ''

Answer 1

sap.m.ScrollContainer将格式字符串作为参数，而不是编码的字节对象。在您的情况下，struct.calcsize。

Python Struct / Packing错误

1 个答案: