python实现客户端和服务端的UDP相互通信

Posted 2023-02-26 一节更比六节强

实验指南

这篇博客旨在实验客户端和服务端相互发送消息的实验，实验成功的现象为，客户端和服务端的两个窗口，即client和server左上角均被打上文字，因为客户端是没有给图片附上文字的功能的，十分感谢柒上夏OPO大佬提供源码上的支持

客户端代码

import numpy as np
import cv2
from socket import socket, AF_INET, SOCK_DGRAM

# 127.0.0.1表示本机的IP，用于测试，使用时需要改为服务端的ip
addr = (\'127.0.0.1\', 8081)
IP_ADDR = (\'127.0.0.1\', 8082)
cap = cv2.VideoCapture(0)

# 设置镜头分辨率，默认是640x480
cap.set(cv2.CAP_PROP_FRAME_WIDTH, 640)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 480)

s = socket(AF_INET, SOCK_DGRAM)  # 创建UDP套接字
s.bind(IP_ADDR)

while True:
    _, img = cap.read()

    img = cv2.flip(img, 1)

    # 压缩图片
    _, send_data = cv2.imencode(\'.jpg\', img, [cv2.IMWRITE_JPEG_QUALITY, 50])

    s.sendto(send_data, addr)
    print(f\'正在发送数据，大小:img.size Byte\')

    # cv2.putText(img, "client", (50, 50),
    #             cv2.FONT_HERSHEY_SIMPLEX, 1, (255, 0, 0), 2)
    # cv2.imshow(\'client\', img)

    try:
        data, _ = s.recvfrom(921600)
        print(\'info: \', _)
        receive_data = np.frombuffer(data, dtype=\'uint8\')
        r_img = cv2.imdecode(receive_data, 1)

        cv2.imshow(\'client\', r_img)
        if cv2.waitKey(1) & 0xFF == ord(\'q\'):
            break
    except BlockingIOError as e:
        pass

    if cv2.waitKey(1) & 0xFF == ord(\'q\'):
        break

s.close()
cv2.destroyAllWindows()

服务端代码

from copy import deepcopy
import numpy as np
import cv2
from socket import socket, AF_INET, SOCK_DGRAM

s = socket(AF_INET, SOCK_DGRAM)  # 创建UDP套接字
addr = (\'0.0.0.0\', 8081)  # 0.0.0.0表示本机
s.bind(addr)
s.setblocking(0)  # 设置为非阻塞模式

while True:
    data = None
    try:
        data, s_addr = s.recvfrom(921600)
        print(\'[IP_INFO] \'.format(s_addr))
        receive_data = np.frombuffer(data, dtype=\'uint8\')
        r_img = cv2.imdecode(receive_data, 1)
        r_img_1 = deepcopy(r_img)
        r_img_2 = deepcopy(r_img)

        cv2.putText(r_img_1, "server", (50, 50),
                    cv2.FONT_HERSHEY_SIMPLEX, 1, (255, 0, 0), 2)
        cv2.imshow(\'server\', r_img_1)

        if cv2.waitKey(1) & 0xFF == ord(\'q\'):
            break
        cv2.putText(r_img_2, "client", (50, 50),
                    cv2.FONT_HERSHEY_SIMPLEX, 1, (0, 0, 255), 2)

        _, send_data = cv2.imencode(
            \'.jpg\', r_img_2, [cv2.IMWRITE_JPEG_QUALITY, 50])

        s.sendto(send_data, s_addr)
        print(f\'正在发送数据，大小:r_img.size Byte\')
    except BlockingIOError as e:
        pass
cv2.destroyAllWindows()

实验历程

假设服务端代码放在server.py的文件中，先打开一个终端

python server.py

假设客户端代码放在client.py的文件中，再打开一个终端，输入

python client.py

实验成功的现象

客户端和服务端的两个窗口，即client和server左上角分别被打上client和server的字样，因为客户端是没有给图片附上文字的功能的