78行Python代码实现现微信撤回消息功能

# -*-encoding:utf-8-*- 
import os 
import re 
import shutil 
import time 
import itchat 
from itchat.content import * 
# 说明：可以撤回的有文本文字、语音、视频、图片、位置、名片、分享、附件 
# {msg_id:(msg_from,msg_to,msg_time,msg_time_rec,msg_type,msg_content,msg_share_url)} 
msg_dict = {} 
# 文件存储临时目录 
rev_tmp_dir = "/home/alic/RevDir/" 
if not os.path.exists(rev_tmp_dir): os.mkdir(rev_tmp_dir) 
# 表情有一个问题 | 接受信息和接受note的msg_id不一致 巧合解决方案 
face_bug = None 
# 将接收到的消息存放在字典中，当接收到新消息时对字典中超时的消息进行清理 | 不接受不具有撤回功能的信息 
# [TEXT, PICTURE, MAP, CARD, SHARING, RECORDING, ATTACHMENT, VIDEO, FRIENDS, NOTE] 
@itchat.msg_register([TEXT, PICTURE, MAP, CARD, SHARING, RECORDING, ATTACHMENT, VIDEO]) 
def handler_receive_msg(msg): 
  global face_bug 
  # 获取的是本地时间戳并格式化本地时间戳 e: 2017-04-21 21:30:08 
  msg_time_rec = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()) 
  # 消息ID 
  msg_id = msg['MsgId'] 
  # 消息时间 
  msg_time = msg['CreateTime'] 
  # 消息发送人昵称 | 这里也可以使用RemarkName备注　但是自己或者没有备注的人为None 
  msg_from = (itchat.search_friends(userName=msg['FromUserName']))["NickName"] 
  # 消息内容 
  msg_content = None 
  # 分享的链接 
  msg_share_url = None 
  if msg['Type'] == 'Text' \ 
      or msg['Type'] == 'Friends': 
    msg_content = msg['Text'] 
  elif msg['Type'] == 'Recording' \ 
      or msg['Type'] == 'Attachment' \ 
      or msg['Type'] == 'Video' \ 
      or msg['Type'] == 'Picture': 
    msg_content = r"" + msg['FileName'] 
    # 保存文件 
    msg['Text'](rev_tmp_dir + msg['FileName']) 
  elif msg['Type'] == 'Card': 
    msg_content = msg['RecommendInfo']['NickName'] + r" 的名片" 
  elif msg['Type'] == 'Map': 
    x, y, location = re.search( 
      "<location x=\"(.*" y=\"(.*".*label=\"(.*".*", msg['OriContent']).group(1, 2, 3) 
    if location is None: 
      msg_content = r"纬度->" + x.__str__() + " 经度->" + y.__str__() 
    else: 
      msg_content = r"" + location 
  elif msg['Type'] == 'Sharing': 
    msg_content = msg['Text'] 
    msg_share_url = msg['Url'] 
  face_bug = msg_content 
  # 更新字典 
  msg_dict.update( 
    { 
      msg_id: { 
        "msg_from": msg_from, "msg_time": msg_time, "msg_time_rec": msg_time_rec, 
        "msg_type": msg["Type"], 
        "msg_content": msg_content, "msg_share_url": msg_share_url 
      } 
    } 
  ) 
# 收到note通知类消息，判断是不是撤回并进行相应操作 
@itchat.msg_register([NOTE]) 
def send_msg_helper(msg): 
  global face_bug 
  if re.search(r"\<\!\[CDATA\[.*撤回了一条消息\]\]\>", msg['Content']) is not None: 
    # 获取消息的id 
    old_msg_id = re.search("\<msgid\>(.*", msg['Content']).group(1) 
    old_msg = msg_dict.get(old_msg_id, {}) 
    if len(old_msg_id) < 11: 
      itchat.send_file(rev_tmp_dir + face_bug, toUserName='filehelper') 
      os.remove(rev_tmp_dir + face_bug) 
    else: 
      msg_body = "告诉你一个秘密~" + "\n" \ 
            + old_msg.get('msg_from') + " 撤回了 " + old_msg.get("msg_type") + " 消息" + "\n" \ 
            + old_msg.get('msg_time_rec') + "\n" \ 
            + "撤回了什么 " + "\n" \ 
            + r"" + old_msg.get('msg_content') 
      # 如果是分享存在链接 
      if old_msg['msg_type'] == "Sharing": msg_body += "\n就是这个链接" + old_msg.get('msg_share_url') 
      # 将撤回消息发送到文件助手 
      itchat.send(msg_body, toUserName='filehelper') 
      # 有文件的话也要将文件发送回去 
      if old_msg["msg_type"] == "Picture" \ 
          or old_msg["msg_type"] == "Recording" \ 
          or old_msg["msg_type"] == "Video" \ 
          or old_msg["msg_type"] == "Attachment": 
        file = '@fil@%s' % (rev_tmp_dir + old_msg['msg_content']) 
        itchat.send(msg=file, toUserName='filehelper') 
        os.remove(rev_tmp_dir + old_msg['msg_content']) 
      # 删除字典旧消息 
      msg_dict.pop(old_msg_id) 
if __name__ == '__main__': 
  itchat.auto_login(hotReload=True,enableCmdQR=2) 
  itchat.run()

 ~ python wx.py 
Getting uuid of QR code. 
Downloading QR code. 
Please scan the QR code to log in. 
Please press confirm on your phone. 
Loading the contact, this may take a little while. 
"text-align: center"> 

03 itchat
上面都是编程逻辑的小事，我还是记录一下itchat微信这个开源库。
1. 简介
itchat是一个开源的微信个人号接口，使用python调用微信变得非常简单。简单是用itchat代码即可构建一个基于微信的即时通讯，更不错的体现在于方便扩展个人微信的在其他平台的更多通讯功能。
2. 安装
pip3 install itchat
3. itchat - Helloworld
仅仅三行代码发送一条信息给文件传输助手。


import itchat 
itchat.auto_login(hotReload=True) 
itchat.send('Hello AlicFeng', toUserName='filehelper')


4. 查看客户端
 
学习最重要的还是API说明手册：
Github for itchat：
https://github.com/liduanwei/ItChat
中文API：
http://itchat.readthedocs.io/zh/latest/