Python 技术篇-利用itchat微信机器人查看好友已撤回消息实例演示！

# -*- coding: UTF8 -*-
import itchat
import requests
import re

data = {}   # 用于存储所有消息的dict字典

# 当接收到消息会触发
@itchat.msg_register(itchat.content.TEXT,isFriendChat=True,isGroupChat=True)
def record(msg):
    content = msg['Content']
    id = msg['MsgId']
    data[id] = content 
    
# 当收到通知会触发
@itchat.msg_register(itchat.content.NOTE,isFriendChat=True,isGroupChat=True)
def reply(msg):
    if '撤回了一条消息' in msg['Content']:
        old_msg_id = re.search("\<msgid\>(.*?)\<\/msgid\>", msg['Content']).group(1)   # 用正则表达式匹配出最近一次撤回消息的id
        old_msg = data.get(old_msg_id)   # 读取存储在字典中对应id的消息
    
    if old_msg != None:
        return "你撤回了消息：" + str(old_msg)