Struct.error: неверный символ в формате структуры ⇐ Python

[Anonymous]

У меня возникла проблема с небольшим назначением сервер-клиент в Python 2.7.

Клиент может отправлять 5 типов запросов на сервер:

• получить IP-адрес сервера
• получить содержимое каталога на сервере
• запустить команду cmd на сервере и получить результат
• открыть калькулятор на сервере сервер
• отключиться

по сути, я получаю вот такую ошибку:

line 19, in server
data_size = calcsize(client_structs) - 3

struct.error: bad char in struct format


Был бы признателен за объяснение этой ошибки и способов ее решения.

Код сервера:

__author__ = 'eyal'

from struct import pack, unpack, calcsize
import socket
from os import listdir
from subprocess import check_output, call

def server():
ser_soc = socket.socket()
ser_soc.bind(("0.0.0.0", 8080))
ser_soc.listen(1)
while True:
accept_flag = raw_input("Would you like to wait for a client? (y/n) ")
if accept_flag == "y":
client_soc, client_address = ser_soc.accept()
while True:
client_structs = client_soc.recv(1024)
data_size = calcsize(client_structs) - 3
data_str = 'c' * data_size
unpacked_data = unpack("BH" + data_str, client_structs)
if unpacked_data[0] == 1:
ip = socket.gethostbyname(socket.gethostname())
ip_data = 'c' * len(ip)
to_send = pack("BH" + str(len(ip)) + ip_data, unpacked_data[0], len(ip), ip)
elif unpacked_data[0] == 2:
content = listdir(str(unpacked_data[2]))
content_str = "\r\n".join(content)
content_data = 'c' * len(content_str)
to_send = pack("BH" + str(len(content_str)) + content_data, unpacked_data[0],
len(content_str), content_str)
elif unpacked_data[0] == 3:
command = str(unpacked_data[2:]).split()
output = check_output(command)
message_data = 'c' * len(output)
to_send = pack("BH" + message_data, unpacked_data[0], len(output), output)
elif unpacked_data[0] == 4:
call("gnome-calculator")
msg_data = 'c' * len("The calculator is open.")
to_send = pack("BH" + msg_data, unpacked_data[0], len("The calculator is open."),
"The calculator is open.")
elif unpacked_data[0] == 5:
client_soc.close()
break
else:
to_send = pack("BH" + 'c' * len("invalid message type, try again"),
unpacked_data[0], len("invalid message type, try again"),
"invalid message type, try again")
if unpacked_data[0] != 5:
client_soc.send(to_send)
else:
break
ser_soc.close()

def main():
server()

if __name__ == "__main__":
main()


Код клиента:

__author__ = 'eyal'

from struct import pack, unpack, calcsize
import socket

def client():
my_soc = socket.socket()
my_soc.connect(("127.0.0.1", 8080))
while True:
send_flag = raw_input("Would you like to send the server a request? (y/n) ")
if send_flag == "y":
msg_code = input("What type of request would you like to send?\n"
"1. Get the server's IP address.\n"
"2. Get content of a directory on the server.\n"
"3. Run a terminal command on the server and get the output.\n"
"4. Open a calculator on the server.\n"
"5. Disconnect from the server.\n"
"Your choice: ")
if msg_code == 1 or msg_code == 4 or msg_code == 5:
to_send = pack("BH", msg_code, 0)
elif msg_code == 2:
path = raw_input("Enter path of wanted directory to get content of: ")
to_send = pack("BH" + 'c' * len(path), msg_code, len(path), path)
elif msg_code == 3:
command = raw_input("Enter the wanted terminal command, including arguments: ")
to_send = pack("BH" + 'c' * len(command), msg_code, len(command), command)
else:
print "Invalid message code, try again\n"

if 1

Подробнее здесь: https://stackoverflow.com/questions/299 ... uct-format