从客户端接收回数据 [英] receiving back data from the client
本文介绍了从客户端接收回数据的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
这是server.py
import socket
import numpy as np
import pandas as pd
import sklearn
from sklearn.preprocessing import MinMaxScaler
i = 0
scaler_ti = MinMaxScaler()
test_inputs = []
test_inputs = np.array(test_inputs)
temp_in = pd.read_excel(r'K:BachelorThesisDataTestingDataMix_Data_inputs.xlsx')
test_inputs = temp_in.to_numpy()
rows = test_inputs.shape[0]
scaler_ti.fit(test_inputs)
normalized_test_inputs = scaler_ti.transform(test_inputs)
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = ''
port = 62402
s.bind((host,port))
s.listen(5)
while True:
connection, clientsocket, address = s.accept()
print(f"connection from {address} has been established!")
strg = test_inputs
temp = strg.tobytes()
clientsocket.send(temp)
clientsocket.close()
if i in range(65533):
i = i + 1
msg = connection.recv(64)
out = np.frombuffer(msg)
inverse = scaler_ti.inverse_transform(out.reshape(1,8))
print(inverse)
这是client.py
import socket
import numpy as np
import pandas as pd
import sklearn
from sklearn.preprocessing import MinMaxScaler
from tensorflow.keras.models import load_model
import tensorflow as tf
from random import randint
i = 0
final = []
final = np.array(final)
#modelLSTM = load_model('K:BachelorThesiscode testingTireForces.LSTM/LSTM_model.h5')
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = socket.gethostname()
port = 62402
s.connect((host, port))
while True:
if i in range(65533):
i = i + 1
msg = s.recv(64)
out = np.frombuffer(msg)
#out = out.reshape(1,8)
#out = out.reshape(1,1,8)
#prediction = modelLSTM.predict(out)
#inverse = scaler_ti.inverse_transform(prediction.reshape(1,8))
#print(prediction)
#print(inverse)
final = np.vstack(out)
print(out)
if len(msg) <= 0:
break
strg = final
temp = strg.tobytes()
s.send(temp)
#serversocket.close()
#print (final)
这是我从server.py收到的错误
Traceback (most recent call last):
File "K:BachelorThesiscode testingserver.py", line 26, in <module>
connection, clientsocket, address = s.accept()
ValueError: not enough values to unpack (expected 3, got 2)
这是我从client.py收到的错误
Traceback (most recent call last):
File "K:BachelorThesiscode testingclient.py", line 31, in <module>
final = np.vstack(out)
File "<__array_function__ internals>", line 5, in vstack
File "C:UserskarimAppDataLocalProgramsPythonPython39libsite-
packages
umpycoreshape_base.py", line 283, in vstack
return _nx.concatenate(arrs, 0)
File "<__array_function__ internals>", line 5, in concatenate
ValueError: need at least one array to concatenate
推荐答案
您的主要问题是accept()始终只发送两个值，但您需要三个值。
应该是
connection, address = s.accept()
并且您应该使用connection而不是clientsocket
但它会带来其他问题，因为您在发送数据后关闭clientsocket，但您还需要此连接才能接收数据。
所有这一切看起来像是你加入了两个代码。这些代码可以单独工作，但不能一起工作-因为这两个代码都需要关闭连接以通知数据已结束，但现在您在发送后无法关闭它，因为您需要连接才能接收其他数据。
您必须使用不同的方式通知对方数据已结束。您必须首先发送数据大小(作为具有恒定大小的对象，因此作为字符串发送将不起作用，因为对于不同的数字，它可能具有不同的长度)，然后再发送数据。然后另一端必须首先获取数据大小(作为具有恒定大小的对象)，然后使用该si值来检测它是否获取了所有数据。您可以使用struct将integer大小转换为4个字节(因此，对于不同的值，它的大小是恒定的)，而另一端必须读取4个字节，然后再次使用struct将其转换回integer
我无法运行它，但以下是代码。
服务器：
import socket
import struct
import numpy as np
import pandas as pd
import sklearn
from sklearn.preprocessing import MinMaxScaler
# --- functions ---
def send_data(connection, data):
data_size = len(data)
data_size_as_4_bytes = struct.pack('>I', data_size)
connection.send(data_size_as_4_bytes)
connection.send(data)
def recv_data(connection, chunk_size=64):
data_size_as_4_bytes = connection.recv(4)
data_size = struct.unpack('>I', data_size_as_4_bytes)[0]
data = b""
size = 0
while size < data_size:
chunk = connection.recv(chunk_size)
size += len(chunk)
data += chunk
return data
# --- main ---
scaler_ti = MinMaxScaler()
temp_in = pd.read_excel(r'K:BachelorThesisDataTestingDataMix_Data_inputs.xlsx')
test_inputs = temp_in.to_numpy()
rows = test_inputs.shape[0]
scaler_ti.fit(test_inputs)
normalized_test_inputs = scaler_ti.transform(test_inputs)
# -- send ---
HOST = '' # or '0.0.0.0'
PORT = 62402
#s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s = socket.socket() # default values are `socket.AF_INET, socket.SOCK_STREAM`
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) # solution for '[Error 89] Address already in use'. Use before bind()
s.bind((HOST, PORT))
s.listen(5)
try:
while True:
print('Waiting for client')
# wait for new client
connection, address = s.accept()
print(f"connection from {address} has been established!")
# --- send data ---
print('send:', test_inputs)
data = test_inputs.tobytes()
send_data(connection, data)
# don't close it because it is needed to receive data
#clientsocket.close()
# --- receive data ---
data = recv_data(connection)
output_data = np.frombuffer(data)
print('recv:', output_data)
# --- now you can close ---
connection.close()
except KeyboardInterrupt:
print("Stopped by Ctrl+C")
finally:
s.close()
客户端：
import socket
import struct
import numpy as np
import pandas as pd
import sklearn
from sklearn.preprocessing import MinMaxScaler
from tensorflow.keras.models import load_model
import tensorflow as tf
from random import randint
# --- functions ---
def send_data(connection, data):
data_size = len(data)
data_size_as_4_bytes = struct.pack('>I', data_size)
connection.send(data_size_as_4_bytes)
connection.send(data)
def recv_data(connection, chunk_size=64):
data_size_as_4_bytes = connection.recv(4)
data_size = struct.unpack('>I', data_size_as_4_bytes)[0]
data = b""
size = 0
while size < data_size:
chunk = connection.recv(chunk_size)
size += len(chunk)
data += chunk
return data
def some_calcuations(input_data)
# need something different
output_data = input_data
return output_data
# --- main ---
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = socket.gethostname()
port = 62402
s.connect((host, port))
# --- recv ---
data = recv_data(s)
input_data = np.frombuffer(msg)
print('recv:', input_data)
# --- calculations ---
output_data = some_calcuations(input_data)
# --- send ---
print('send:', output_data)
data = output_data.tobytes()
send_data(s, data)
# --- close ---
s.close()
btw：
上周出现了类似的问题，我在其中显示了工作代码-它还使用threading同时为多个客户端运行服务器。
GUI运行时使用Socket发送图片(截图)：
not responding in tkinter when click button completely
使用套接字发送泡菜：
Pickle data truncated
在服务器的线程中使用套接字，以便与多个客户端协同工作：
How to handle multithreading with sockets in Python?
编辑：
循环发送的版本。
在所有行之后，它发送单词end以通知已结束数据。
或者它可以在数据之前发送行数。
服务器：
import socket
import numpy as np
import struct
# --- functions ---
def send_data(connection, data):
data_size = len(data)
data_size_as_4_bytes = struct.pack('>I', data_size)
connection.send(data_size_as_4_bytes)
connection.send(data)
def recv_data(connection, chunk_size=64):
data_size_as_4_bytes = connection.recv(4)
data_size = struct.unpack('>I', data_size_as_4_bytes)[0]
data = b""
size = 0
while size < data_size:
chunk = connection.recv(chunk_size)
size += len(chunk)
data += chunk
return data
# --- main ---
np.random.seed(0) # it will always gives the same random numbers
test_inputs = np.random.random_sample((3,5))
# -- send ---
HOST = '' # or '0.0.0.0'
PORT = 62402
#s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s = socket.socket() # default values are `socket.AF_INET, socket.SOCK_STREAM`
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) # solution for '[Error 89] Address already in use'. Use before bind()
s.bind((HOST, PORT))
s.listen(5)
try:
while True:
# --- wait for new client ---
print('Waiting for client')
connection, address = s.accept()
print(f"Connection from {address} has been established!")
# --- send ---
for row in test_inputs:
# --- send data ---
print('send:', row)
data = row.tobytes()
send_data(connection, data)
# --- receive data ---
data = recv_data(connection)
row = np.frombuffer(data)
print('recv:', row)
# information that it is end of data
send_data(connection, 'end'.encode())
# --- now you can close ---
connection.close()
except KeyboardInterrupt:
print("Stopped by Ctrl+C")
finally:
s.close()
客户端：
# author: Bartlomiej "furas" Burek (https://blog.furas.pl)
# date: 2021.07.23
#
# title: receiving back data from the client
# url: https://stackoverflow.com/questions/68499599/receiving-back-data-from-the-client/68502806#68502806
import socket
import numpy as np
from random import randint
import struct
# --- functions ---
def send_data(connection, data):
data_size = len(data)
data_size_as_4_bytes = struct.pack('>I', data_size)
connection.send(data_size_as_4_bytes)
connection.send(data)
def recv_data(connection, chunk_size=64):
data_size_as_4_bytes = connection.recv(4)
data_size = struct.unpack('>I', data_size_as_4_bytes)[0]
data = b""
size = 0
while size < data_size:
chunk = connection.recv(chunk_size)
size += len(chunk)
data += chunk
return data
def some_calcuations(input_data):
# need something different
output_data = input_data
return output_data
# --- main ---
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = socket.gethostname()
port = 62402
s.connect((host, port))
while True:
# --- recv ---
data = recv_data(s)
if data == b'end':
break
input_data = np.frombuffer(data)
print('recv:', input_data)
# --- calculations ---
output_data = some_calcuations(input_data)
# --- send ---
print('send:', output_data)
data = output_data.tobytes()
send_data(s, data)
# --- close ---
s.close()
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