最近執行專案時發現現場人員會使用Web camera 來monitor 電腦螢幕，因為Web camera 有連到Server, 可以遠端監控，且有記錄和回放功能。當下覺得實在太好笑了，為何不直接把電腦畫面直接傳到Web Camera server 就好了。

了解後才發現螢幕監控記錄系統要額外花錢，現場人員等於是在不增加太多成本的方式來延用舊有系統。

個人覺得這件事沒那麼困難，於是便在下班時間寫了一個可在背景執行的程式，可以把當下電腦畫面模擬成IP camera的串流訊號。如此一來，只要把這個IP camera 加入Web camera server，就可以把電腦畫面送到Server了! 下面是 Python code 提供參考：

import cv2
import numpy as np
import pyautogui
import socket
import time
import sys
import traceback
import logging
from threading import Thread

logging.basicConfig(filename='ip_camera_simulator.log', level=logging.DEBUG, 
                    format='%(asctime)s - %(levelname)s - %(message)s')

def handle_client(client_socket):
    try:
        logging.info("New client connected")
        client_socket.sendall(b"HTTP/1.1 200 OK\r\n")
        client_socket.sendall(b"Content-Type: multipart/x-mixed-replace; boundary=frame\r\n")
        client_socket.sendall(b"\r\n")
        
        while True:
            try:
                screenshot = pyautogui.screenshot()
                frame = cv2.cvtColor(np.array(screenshot), cv2.COLOR_RGB2BGR)
                _, jpeg = cv2.imencode('.jpg', frame)
                
                client_socket.sendall(b"--frame\r\n")
                client_socket.sendall(b"Content-Type: image/jpeg\r\n")
                client_socket.sendall(f"Content-Length: {len(jpeg)}\r\n".encode())
                client_socket.sendall(b"\r\n")
                client_socket.sendall(jpeg.tobytes())
                client_socket.sendall(b"\r\n")
                
                logging.debug("Frame sent")
                time.sleep(0.1)
            except (ConnectionResetError, BrokenPipeError) as e:
                logging.info(f"Client disconnected: {str(e)}")
                break
            except Exception as e:
                logging.error(f"Error in frame capture/send: {str(e)}")
                logging.error(traceback.format_exc())
                break
    except Exception as e:
        logging.error(f"Error handling client: {str(e)}")
        logging.error(traceback.format_exc())
    finally:
        client_socket.close()

def run_server(port=8000):
    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    server_socket.bind(('', port))
    server_socket.listen(5)
    logging.info(f"Server running on port {port}")
    print(f"Server running on port {port}")

    while True:
        try:
            client_sock, address = server_socket.accept()
            logging.info(f"Accepted connection from {address}")
            client_thread = Thread(target=handle_client, args=(client_sock,))
            client_thread.start()
        except Exception as e:
            logging.error(f"Error accepting connection: {str(e)}")
            logging.error(traceback.format_exc())

if __name__ == '__main__':
    try:
        logging.info("Starting application")
        run_server()
    except Exception as e:
        logging.error(f"Unhandled exception: {str(e)}")
        logging.error(traceback.format_exc())
        print(f"An error occurred: {str(e)}")
        input("Press Enter to exit...")

"""
Packaging Instructions:

1. Save this script as 'desktop_ip_camera.py'

2. Install PyInstaller:
   pip install pyinstaller

3. Create a spec file:
   pyi-makespec --onefile desktop_ip_camera.py

4. Edit the generated desktop_ip_camera.spec file:
   - Add these imports at the top:
     import sys
     import os

   - In the Analysis section, add:
     pathex=[os.path.dirname(sys.executable)],

   - In the EXE section, ensure:
     console=True,

5. Build using the spec file:
   pyinstaller --clean desktop_ip_camera.spec

6. Look for the executable in the 'dist' folder.

Running and Troubleshooting:
1. Run the executable from command prompt as administrator.
2. Check the generated 'ip_camera_simulator.log' file for error messages.
3. Try accessing http://localhost:8000 in your web browser.
4. If issues persist, check your firewall and antivirus settings.
"""

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