Python 共享内存

清理文件，记录一下共享内存的代码。后面再解析理解。

import mmap
import contextlib
import time
import zeep
import numpy as np
import cv2
import time
from onvif import ONVIFCamera
import requests
from requests.auth import HTTPDigestAuth
with open("test.dat", "w") as f:
    f.write('x00' * 1024)

def zeep_pythonvalue(self, xmlvalue):
    return xmlvalue
# with open('test.dat', 'r+') as f:
#     with contextlib.closing(mmap.mmap(f.fileno(), 1024, access=mmap.ACCESS_WRITE)) as m:
#         for i in range(1, 10001):
#             m.seek(0)
#             s = ("msg " + str(i)).encode()
#             # s=s.rjust(1024, 'x00').encode()
#             print(s)
#             m.write(s)
#             m.flush()
#             time.sleep(1)



class onvifCamera(object):
    def __init__(self, ip: str, username: str, password: str):
        self.ip = ip
        self.username = username
        self.password = password
        zeep.xsd.simple.AnySimpleType.pythonvalue = zeep_pythonvalue
        self.init_ipc()
    def init_ipc(self):
        try:
            self.mycam = ONVIFCamera(self.ip, 80, self.username, self.password)
            self.media = self.mycam.create_media_service()  # 创建媒体服务
            self.media_profile = self.media.GetProfiles()[0]  # 获取配置信息
            # self.ptz = self.mycam.create_ptz_service()  # 创建控制台服务
            # print(self.media_profile)
            return True
        except Exception as e:
            print(e)
            return False

    def Snapshot(self):
        """
        截图
        :return:
        """
        res = self.media.GetSnapshotUri({'ProfileToken': self.media_profile.token})

        response = requests.get(res.Uri, auth=HTTPDigestAuth(self.username, self.password))
        print(len(response.content))
        return response.content
        # with open(self.save_path, 'wb') as f:  # 保存截图
        #     f.write(response.content)
camera0 = onvifCamera('192.168.8.153','admin','tensorsight666')
with open('test.dat', 'w+') as f:
    with contextlib.closing(mmap.mmap(f.fileno(), 1024*1024, access=mmap.ACCESS_WRITE)) as m:
            while True:
                m.seek(0)
                # s = ("msg " + str(i)).encode()
                image_buff = camera0.Snapshot()
                s=image_buff
                # s=s.rjust(1024, 'x00').encode()
                # print(s)
                image = cv2.imdecode(np.fromstring(s, np.uint8), 1)
                cv2.imshow('cv0', image)
                cv2.waitKey(1)
                m.write(s)
                m.flush()
                time.sleep(1)
# image_buff =camera0.Snapshot()

# -*- coding：utf-8 -*-
# SodrSnne's PYTHON
# @Time    : 2021/2/20 17:29
# @Email   : jisashandianmao@163.com
# @File    : client.py
# @Software: PyCharm
_author_ = 'SodrSnne'
import mmap
import contextlib
import time

import mmap
import contextlib
import time
import numpy as np
import cv2

while True:
    with open(r'E:Business_projectsonvifsctrlcamrera192.168.8.153data.dat', 'r') as f:
        with contextlib.closing(mmap.mmap(f.fileno(), 1024*312, access=mmap.ACCESS_READ)) as m:
            s = m.read(1024*1000)#.replace('x00', '')
            image = cv2.imdecode(np.frombuffer(s, np.uint8), 1)
            cv2.imshow('cv', image)
            cv2.waitKey(1)
            # print(s)
    time.sleep(1)