学习前言
想要实时监测电脑屏幕与摄像头前的人，我们必须满足以下几个条件：一、我们需要获取当前屏幕的分辨率，以方便之后调整电脑屏幕截图的尺寸。二、我们需要间隔的获取（while True）此时界面的截图和摄像头捕捉到的一帧图像。三、我们需要将我们获得的截图发送到我们的邮箱。
效果图
屏幕截屏：
屏幕前的人：
各个功能代码详解：
ａ．获取当前屏幕截图
def grab_screen(region=None): hwin = win32gui.GetDesktopWindow() if region: left, top, x2, y2 = region width = x2 - left + 1 height = y2 - top + 1 else: width = win32api.GetSystemMetrics(win32con.SM_CXVIRTUALSCREEN) height = win32api.GetSystemMetrics(win32con.SM_CYVIRTUALSCREEN) left = win32api.GetSystemMetrics(win32con.SM_XVIRTUALSCREEN) top = win32api.GetSystemMetrics(win32con.SM_YVIRTUALSCREEN) hwindc = win32gui.GetWindowDC(hwin) srcdc = win32ui.CreateDCFromHandle(hwindc) memdc = srcdc.CreateCompatibleDC() bmp = win32ui.CreateBitmap() bmp.CreateCompatibleBitmap(srcdc, width, height) memdc.SelectObject(bmp) memdc.BitBlt((0, 0), (width, height), srcdc, (left, top), win32con.SRCCOPY) signedIntsArray = bmp.GetBitmapBits(True) img = np.frombuffer(signedIntsArray, dtype='uint8') img.shape = (height, width, 4) srcdc.DeleteDC() memdc.DeleteDC() win32gui.ReleaseDC(hwin, hwindc) win32gui.DeleteObject(bmp.GetHandle()) return cv2.cvtColor(img, cv2.COLOR_BGRA2RGB)
ｂ．获取当前屏幕分辨率
def get_screen_size(): import tkinter screen = tkinter.Tk() w = screen.winfo_screenwidth() # 获取当前屏幕的宽 h = screen.winfo_screenheight() # 获取当前屏幕的高 return w, h
ｃ．发送图片至QQ邮箱
#! /usr/bin/env python # coding=utf-8 import smtplib from email.mime.multipart import MIMEMultipart from email.mime.text import MIMEText from email.mime.application import MIMEApplication def send_img_to_email(rec_qq, sen_qq, pwd, img_path): receiver = rec_qq + "@qq.com" # 发送邮件的邮箱 sender = sen_qq + "@qq.com" # 接受邮件的邮箱（可以和上面的一样 pwd = pwd # @qq.com邮箱SMTP的授权码 # wquuvpbunfqoeahe msg = MIMEMultipart() msg["Subject"] = "有陌生人来访！" # 邮件的主题 msg["From"] = sender msg["To"] = receiver part = MIMEText("请查收陌生人照片！") # 邮件的正文 msg.attach(part) # 图片 part = MIMEApplication(open(img_path, 'rb').read()) part.add_header('Content-Disposition', 'attachment', filename=img_path) msg.attach(part) try: s = smtplib.SMTP("smtp.qq.com", timeout=30) # 连接smtp邮件服务器,端口默认是25 s.ehlo() s.starttls() s.login(sender, pwd) # 登陆服务器 s.sendmail(sender, receiver, msg.as_string()) # 发送邮件 s.close() print('邮件发送成功！') except smtplib.SMTPException: print('邮件发送失败！') ＃ 使用案例 if __name__ == '__main__': qq = '2642898145' send_img_to_email(qq, qq, 'wquuvpbunfqoeahe', '2.png')
成品
最终合成的代码（可设置每隔多久发送一次：
import time import cv2 import numpy as np import win32gui import win32ui import win32con import win32api # coding=utf-8 import smtplib from email.mime.multipart import MIMEMultipart from email.mime.text import MIMEText from email.mime.application import MIMEApplication class computerScreenDetecter(object): def __init__(self, qq, pwd, img_path, time_cell): self.qq = qq self.pwd = pwd self.img_path = img_path self.time_cell = time_cell def get_screen_size(self): import tkinter screen = tkinter.Tk() w = screen.winfo_screenwidth() # 获取当前屏幕的宽 h = screen.winfo_screenheight() # 获取当前屏幕的高 return int(w*1.3), int(h*1.3) def grab_screen(self, region=None): hwin = win32gui.GetDesktopWindow() if region: left, top, x2, y2 = region width = x2 - left + 1 height = y2 - top + 1 else: width = win32api.GetSystemMetrics(win32con.SM_CXVIRTUALSCREEN) height = win32api.GetSystemMetrics(win32con.SM_CYVIRTUALSCREEN) left = win32api.GetSystemMetrics(win32con.SM_XVIRTUALSCREEN) top = win32api.GetSystemMetrics(win32con.SM_YVIRTUALSCREEN) hwindc = win32gui.GetWindowDC(hwin) srcdc = win32ui.CreateDCFromHandle(hwindc) memdc = srcdc.CreateCompatibleDC() bmp = win32ui.CreateBitmap() bmp.CreateCompatibleBitmap(srcdc, width, height) memdc.SelectObject(bmp) memdc.BitBlt((0, 0), (width, height), srcdc, (left, top), win32con.SRCCOPY) signedIntsArray = bmp.GetBitmapBits(True) img = np.frombuffer(signedIntsArray, dtype='uint8') img.shape = (height, width, 4) srcdc.DeleteDC() memdc.DeleteDC() win32gui.ReleaseDC(hwin, hwindc) win32gui.DeleteObject(bmp.GetHandle()) return cv2.cvtColor(img, cv2.COLOR_BGRA2RGB) def pritn_time(self): import time time_tuple = time.localtime(time.time()) print("当前时间为: {}年{}月{}日 - {}:{}:{}".format(time_tuple[0], time_tuple[1], time_tuple[2], time_tuple[3], time_tuple[4], time_tuple[5])) def send_img_to_email(self): sender = self.qq + "@qq.com" # 发送邮件的邮箱（ receiver = self.qq + "@qq.com" # 接受邮件的邮箱 可以和sender的一样 pwd = self.pwd # @qq.com邮箱SMTP的授权码 # wquuvpbunfqoeahe msg = MIMEMultipart() msg["Subject"] = "有陌生人来访！" # 邮件的主题 msg["From"] = sender msg["To"] = receiver part = MIMEText("请查收陌生人照片！") # 邮件的正文 msg.attach(part) # 图片 part = MIMEApplication(open(self.img_path, 'rb').read()) # ''和该.py文件在同一个文件夹下 part.add_header('Content-Disposition', 'attachment', filename=self.img_path) msg.attach(part) try: s = smtplib.SMTP("smtp.qq.com", timeout=30) # 连接smtp邮件服务器,端口默认是25 s.ehlo() s.starttls() s.login(sender, pwd) # 登陆服务器 s.sendmail(sender, receiver, msg.as_string()) # 发送邮件 s.close() print('邮件发送成功！') except smtplib.SMTPException: print('邮件发送失败！') def get_creamerImg(self): cap = cv2.VideoCapture(0) time_cell = 1 while time_cell: success, img = cap.read() cv2.imwrite('screen_img.png', img) time_cell -= 1 cap.release() cv2.destroyAllWindows() def demo(self): w, h = self.get_screen_size() start_time = time.time() while True: img = self.grab_screen(region=(0, 0, w, h)) end_time = int(time.time() - start_time) # 间隔60s发送一次 if end_time % self.time_cell == 0: self.pritn_time() cv2.imwrite('screen_img.png', img) print('电脑屏幕检测准备开始！') self.send_img_to_email() print('电脑摄像头检测准备开始！') self.get_creamerImg() self.send_img_to_email() # 使用案例 if __name__ == "__main__": qq = '2642898145' # 发送者和接受者的QQ都用同一个 kwd = 'wquuvpbunfqoeahe' # QQ邮箱SMTP授权码 img_path = 'screen_img.png' # 写入本地图片路径 time_cell = 60 # 时间间隔多久发送一次截屏 单位：秒(s) sd = computerScreenDetecter(qq, kwd, img_path, time_cell) sd.demo()
补充想法：
我们是不是可以添加一个人脸识别，捕捉到摄像头前人的图片之后识别是否是自己或者自己认识的人，如果不是，那么才发送图片警醒自己，如果是，那么告知是谁。
完毕！
制作不易，望点赞＋关注＋收藏（😊(●'◡'●)
