如何在 python 中将图片从服务器发送到客户端

Question

I'm new to python and i can't figure out what's wrong with my code here:

I set up a client and a server (both on localhost), the server take a snapshot and suppose to send it to the client which saves it in some folder, it's all happening, but the JPG file doesn't open the picture correctly, instead it's says that it doesn't support the file format:\

the code:

clientFile.py

import socket

# set up a socket connection object
my_socket = socket.socket()
# make the socket connect to a certain ip&port
my_socket.connect(("127.0.0.1", 8821))

data = ''

while data != 'EXIT':
    message = input('enter a message to send to the server \n')
    # send the server what to do (in this case take a snapshot)
    my_socket.send(message.encode())
    
    data = my_socket.recv(1024).decode()
   
    if data == 'snapshot has been taken':
        # recieve the file's byte length from the server ( for example: 2000000 bytes => 7 length)
        data = my_socket.recv(1).decode()
        
        sizeLength = int(data) % 10
        # recieve the size of the file picture
        data = my_socket.recv(sizeLength).decode()
        size = int(data)

        # recieve the file in binary
        picture = my_socket.recv(size)
        # trying to write the file :\
        myfile = open(r'C:\test\client\screen.jpg', 'wb')
        myfile.write(picture)
        myfile.close()
else:
    print('closing the socket')
    my_socket.close()

server.py

    import socket
    import datetime
    import glob
    import os
    import pyautogui
    import subprocess
    
    server_socket = socket.socket()
    # accepting a socket from which client (0.0.0.0) means everyone
    server_socket.bind(("0.0.0.0", 8821))
    server_socket.listen()
    # accept sockets and recieve socket and client ip&port as tuples
    (client_socket, client_address) = server_socket.accept()
    
    # data = client_socket.recv(1024).decode()
    data = ''
    while data != 'EXIT':
    .
    .
    .
        elif data == 'SNAPSHOT':
            #snapshot saved succesfully !
            image = pyautogui.screenshot()
            image.save(r'C:\test\screen.jpg') 

            # file stats (size and stuff)
            picStats = os.stat(r'C:\test\screen.jpg')
            
            picSize = picStats.st_size
            picLength = len(str(picSize))
          
            
            myfile = open(r'C:\test\screen.jpg', 'rb')
            print(myfile.read())
            reply = 'snapshot has been taken'
            # make the client prepere for the picture to be send
            client_socket.send(reply.encode())
            # send the picture length
             client_socket.send(str(picLength).encode())
            # send the picture size 
            client_socket.send(str(picSize).encode())
            client_socket.send(myfile.read())
            
.
.
.
#closing sockets eventually ...
             

i think i'm missing something here... thanks

Answer 1

Well I have one issue with the code:

# This reads all the bytes in the file 
print(myfile.read())

# this will read nothing since the file cursor is already at the end of the file. 
client_socket.send(myfile.read())

Either set the bytes to an internal object file_bytes= myfile.read() or reset the cursor between reads myfile.seek(0)