使用Python实现有趣的锁屏小工具

pip install opencv-python

import cv2
import time
import os
import platform

# 检测操作系统
def detect_os():
    os_name = platform.system()
    if os_name == 'Windows':
        return 'windows'
    elif os_name == 'Darwin':
        return 'mac'
    else:
        return 'other'

# 执行锁屏命令
def lock_screen(os_type):
    if os_type == 'windows':
        os.system('rundll32.exe user32.dll, LockWorkStation')
    elif os_type == 'mac':
        os.system('/System/Library/CoreServices/"Menu Extras"/User.menu/Contents/Resources/CGSession -suspend')
    

# 初始化摄像头
cap = cv2.VideoCapture(0)

# 载入OpenCV的人脸检测模型
face_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + 'haarcascade_frontalface_default.xml')

# 无人状态计时器
no_person_timer = 0
# 设定无人状态时间阈值
NO_PERSON_THRESHOLD = 3

# 检测操作系统类型
os_type = detect_os()

while True:
    ret, frame = cap.read()
    if not ret:
        break

    # 转换为灰度图像
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    faces = face_cascade.detectMultiScale(gray, 1.1, 4)

    if len(faces) == 0:
        no_person_timer += 1
    else:
        no_person_timer = 0

    # 如果超过阈值，则锁屏
    if no_person_timer > NO_PERSON_THRESHOLD:
        lock_screen(os_type)
        no_person_timer = 0

    time.sleep(1)

cap.release()