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我如何知道連接到服務器的客戶端數量,並將連接的客戶端數量返回給用戶?

[英]How can I know the number of clients connected to the server and return the number of the connected clients to the user?

我想知道這些,因為我對此感到瘋狂:

我該怎么做:

1-如果服務器終止,則客戶端也應終止。 您的服務器應允許管理員關閉所有連接(即,服務器必須等待用戶最好通過菜單界面終止程序)。

2-為了知道連接的客戶端數量,您需要唯一地標識每個客戶端-這可以通過使用為每個客戶端連接唯一分配的pid(將它們存儲在全局列表中)來實現。 這些連接可以動態更改(即客戶端可以斷開連接並重新連接),因此您必須在服務器上維護此列表。 這是我的服務器端代碼:

提前致謝

import _thread
import socket
import sys
from datetime import datetime



def serveclient(c):
    global v, nclient, vlock, nclientlock
    while(True):
        k=(c.recv(1)).decode('utf-8')
        if(k==''):
            break
        if(k=='D'):
            today = str(datetime.now().strftime('%Y-%m-%d'))
            c.send(today.encode('utf-8'))
        if(k=='T'):
            tme = str(datetime.now().strftime('%H:%M:%S'))
            c.send(tme.encode('utf-8'))
        if(k=='X'):
                   <<<< # Here I should put the number of clients connected and echo   back the number like the above code
        vlock.acquire()
        v+=k
        vlock.release()

        #Echo back
        c.send(v.encode('utf-8'))
    c.close()   #End connection
    nclientlock.acquire()
    nclient-=1
    nclientlock.release()

#Main driver code
listener = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
port = int(sys.argv[1])
listener.bind(('',port))
listener.listen(5)

#Initialize global data
v=''
vlock=_thread.allocate_lock()
nclient=10       #Max number of clients
nclientlock=_thread.allocate_lock()

#accept calls from clients
for i in range(nclient):
    (client, ap) = listener.accept()
    _thread.start_new_thread(serveclient, (client,))

listener.close()
while nclient >0:
    pass    #do nothing, just wait for client count to drop to zero

print('The final string is: ', v)

<<<<<<<<<<<<<<<<<<<<<<<<<This the Client Code>>>>>>>>>>>>>>>>>>>>>>>

#Client Program. Sends a single char at a time to the server until the client
    #sends a '', this will terminate the client.
    #
    #usage: python server port

    import socket
    import sys

    #create the socket
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    host = sys.argv[1]      #Server info from cmd line
    port = int(sys.argv[2]) #Port from cmd line

    #Conncet to server
    s.connect((host, port))

    while(True):
        #get letter
        k = input('enter a letter: ')
        s.send(k.encode('utf-8'))
        if(k==''):
            break
        v=s.recv(1024)  #receive upto 1024 bytes
        print(v.decode('utf-8'))

    s.close()

只要在每次接受套接字時增加一個計數,就在每次關閉接受的套接字時減少一個計數。

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