ValueError：将字符串转换为int值时，int（）的无效文字的基数为10：''

Question

我正在尝试通过套接字发送/接收数据。将字符串转换为整数值时出现此错误。此整数值是文件名的长度。

Traceback (most recent call last):

File "C:\Users\Nitesh Rathi\Desktop\clientSocket.py", line 16, in <module>

buff = int(filesize)

ValueError: invalid literal for int() with base 10: ''

代码

发送端

from socket import *
import os


HOST = '192.168.1.7'
PORT = 9999
ADDRESS = (HOST, PORT)

soc = socket(AF_INET, SOCK_STREAM)
soc.bind(ADDRESS)
soc.listen(5)
print('listen for connection...')
conn, addr = soc.accept()
print('got connection from', addr)

filename = 'file1.txt'.encode('utf-8')
fl = len(filename)
fl = str(fl)
print('size of filename :', fl, 'bytes')

conn.send(fl.encode('utf-8'))
print('size of filename sent')
conn.send(filename)
print('filename sent')
filedata = 'this is file1 data'.encode('utf-8')
conn.sendall(filedata)
print('data sent')


conn.close()
soc.close()
print('socket closed')

接收方

from socket import *
import os


HOST = '192.168.1.7'
PORT = 9999
ADDRESS = (HOST, PORT)
PATH = "C:/Users/Nitesh Rathi/Desktop/RECV"

soc = socket(AF_INET, SOCK_STREAM)
soc.connect(ADDRESS)
print('connected to', ADDRESS)

while True:
    filesize = soc.recv(255).decode('utf-8')
    buff = int(filesize)
    print("size of filename: ", filesize, 'bytes')
    filename = soc.recv(buff).decode('utf-8')
    if not filename: break
    Path = os.path.join(PATH, filename)
    print(Path)
    file = open(Path, 'wb')
    filedata = soc.recv(1024)
    file.write(filedata)
    file.close()


soc.close()
print('socket closed')
print('data recvd')

我正在尝试通过套接字发送/接收数据。将字符串转换为整数值时出现此错误。此整数值是文件名的长度。追溯（最近一次通话）：文件“ C：\ ...

Answer 1

TCP流套接字实现流协议，而不是消息协议，因此接收者必须事先知道它应该接收多少字节。