如何通过UDP发送图像(或其他大文件)

import socket
import os

def send_file(file_path, host, port):
    # 创建UDP套接字
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF, 65536)

    # 打开文件并读取内容
    with open(file_path, 'rb') as f:
        file_data = f.read()

    # 分割文件为数据包
    packet_size = 1024
    for i in range(0, len(file_data), packet_size):
        packet = file_data[i:i + packet_size]
        seq_num = i // packet_size
        packet_with_seq = f"{seq_num}:{packet.decode('latin1')}"
        sock.sendto(packet_with_seq.encode('latin1'), (host, port))

    print("File sent successfully!")

if __name__ == "__main__":
    file_path = "path/to/your/image.jpg"
    host = "127.0.0.1"
    port = 12345
    send_file(file_path, host, port)

import socket
import os

def receive_file(host, port, output_file):
    # 创建UDP套接字
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    sock.bind((host, port))
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, 65536)

    received_packets = {}
    expected_seq_num = 0

    while True:
        data, addr = sock.recvfrom(65536)
        seq_num_str, packet_data = data.decode('latin1').split(':', 1)
        seq_num = int(seq_num_str)

        if seq_num == expected_seq_num:
            received_packets[seq_num] = packet_data.encode('latin1')
            expected_seq_num += 1

            # 如果接收到所有数据包，重新组装文件
            if expected_seq_num * 1024 >= os.path.getsize(output_file):
                with open(output_file, 'wb') as f:
                    for i in range(expected_seq_num):
                        f.write(received_packets[i])
                print("File received successfully!")
                break
        else:
            received_packets[seq_num] = packet_data.encode('latin1')

if __name__ == "__main__":
    host = "127.0.0.1"
    port = 12345
    output_file = "received_image.jpg"
    receive_file(host, port, output_file)