使用python tkinter开发一个爬取B站直播弹幕工具的实现代码

使用Python Tkinter开发一个爬取B站直播弹幕工具的实现代码可以分为以下步骤：

1. 导入模块

import requests
import json
import re
import tkinter as tk
from tkinter import scrolledtext
import threading
import time

1. 获取直播间id和弹幕服务器地址

def get_live_info(room_id):
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3'}
    res = requests.get('https://api.live.bilibili.com/room/v1/Room/room_init?id=' + room_id, headers=headers)
    data = json.loads(res.text)
    room_id = str(data['data']['room_id'])
    server_url = re.findall(r'[^\x00-\xff]+', data['data']['base_url'])[0]
    post_url = 'https://' + server_url + ':443/sub'

    return room_id, post_url

1. 连接到弹幕服务器

def connect(post_url, room_id):
    json_data = {"roomid":room_id, "protover":1, "platform":"web","clientver":"1.4.0"}
    res = requests.post(post_url, data=json.dumps(json_data).encode('utf-8'), headers={
        'Content-Type': 'application/json',
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3',
        'Origin': 'https://live.bilibili.com'})
    s = res.content
    guid = str(s[0x10:0x14][::-1].hex())
    return s, guid

1. 解析弹幕信息

def parse_dm_info(s):
    while s:
        # 得到消息的长度 header = 16, size = len(s) - header
        header = s[0:16]
        contentlength = int.from_bytes(header[0x00:0x04], byteorder='big')
        magic = header[0x04:0x08]
        op = int.from_bytes(header[0x08:0x0c], byteorder='little')
        sequence = int.from_bytes(header[0x0c:0x10], byteorder='little')
        # 如果不是这个magic 直接返回byte数组
        if magic != b'\x00\x00\x00\x10':
            return s
        # 如果消息长度小于整个消息长条 直接返回byte数组
        if len(s) < contentlength+16:
            return s

        body = s[0x10:contentlength+16]

        try:
            msg = body.decode('utf-8', errors='ignore')
        except UnicodeDecodeError as err:
            print(err)
        # 将每条消息解析成json格式
        dm_json = json.loads(msg, strict=False)
        msg_type = dm_json['cmd']
        data = dm_json['data']

        #根据返回cmd类型来分类处理data数据　
        #在这里可以对每种类型数据进行后续操作　
        if msg_type == 'DANMU_MSG':
            danmu_content = data[1]
            user_name = data[2][1]
            return_msg = user_name + '：“' + danmu_content + '”\n'
        elif msg_type == 'SYS_MSG':
            reason = data['msg']
            return_msg = '系统公告：' + reason + '\n'
        else:
            return_msg = ''

        s = s[contentlength+16:]
        return return_msg

1. GUI设计与多线程爬取弹幕

class Application(tk.Frame):
    def __init__(self, master=None):
        tk.Frame.__init__(self, master)
        self.grid()
        self.room_id = tk.StringVar()
        self.room_id.set('输入房间号')
        self.createWidgets()

    def createWidgets(self):
        self.room_id_entry = tk.Entry(self, textvariable=self.room_id, width=30)
        self.room_id_entry.grid(row=0, column=0)

        self.start_button = tk.Button(self, text='开始', command=self.start_crawl)
        self.start_button.grid(row=0, column=1)

        self.stop_button = tk.Button(self, text='停止', command=self.stop_crawl, state='disabled')
        self.stop_button.grid(row=0, column=2)

        self.scrolled_text = scrolledtext.ScrolledText(self, width=80, height=20)
        self.scrolled_text.grid(row=1, columnspan=3)

    def start_crawl(self):
        self.start_button.config(state='disabled')
        self.stop_button.config(state='normal')
        self.t = threading.Thread(target=self.crawl_dm)
        self.flag = True
        self.t.start()

    def stop_crawl(self):
        self.flag = False
        self.start_button.config(state='normal')
        self.stop_button.config(state='disabled')

    def crawl_dm(self):
        self.scrolled_text.insert(tk.END, "开始爬虫\n")
        room_id, post_url = get_live_info(self.room_id.get())
        s, guid = connect(post_url, room_id)
        while self.flag:
            try:
                s += requests.post(post_url, data=b'\x00\x10\x00\x01\x00\x00\x00\x03\x00\x00\x00\x01\x00\x00\x00\x01', headers={
                    'Content-Type': 'application/octet-stream',
                    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3',
                    'Origin': 'https://live.bilibili.com',
                    'Referer': 'https://live.bilibili.com/' + self.room_id.get(),
                    'Accept-Language': 'zh-CN,zh;q=0.9',
                    'Pragma': 'no-cache',
                    'Cache-Control': 'no-cache'
                }).content
                dm_msg = parse_dm_info(s)
                if dm_msg:
                    self.scrolled_text.insert(tk.END, dm_msg)
                    self.scrolled_text.see(tk.END)
                s = b''
            except Exception as e:
                print(e)

            time.sleep(0.2)

app = Application()
app.master.title('B站直播弹幕爬虫')
app.mainloop()

以上就是使用Python Tkinter开发一个爬取B站直播弹幕工具的完整攻略、示例代码和操作结果。使用这个弹幕爬虫，你可以轻松进行B站弹幕的采集和分析，得到更多有用的信息。