欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

python-图片流传输的思路及示例(url转换二维码)

程序员文章站 2022-06-23 10:50:40
1.场景 将url动态生成二维码前端展示(微信支付等,)--》 1.静态文件路径访问返回url_name,(a标签,src 静态路由访问)2.流传输,前端渲染二进制流返回前端,前端根据二进制流编码...

1.场景

  • 将url动态生成二维码前端展示(微信支付等,)--》

1.静态文件路径访问
返回url_name,(a标签,src 静态路由访问)

2.流传输,前端渲染
二进制流返回前端,前端根据二进制流编码类型显示

3.前端js生成
后台获取到微信支付的code_url,前端js将code_url生成二维码,并渲染

  • 实际代码

使用python_web 框架--》tornado
manager.py

import os
import asyncio

import tornado.ioloop
import tornado.httpserver
import tornado.web
import tornado.options

from tornado.options import define, options, parse_command_line
from apps import urlhandler, url2handler, url3handler


define("port", default=8000, type=int)


def create_app():
  settings = {
    "template_path": os.path.join(os.path.dirname(__file__), "templates"),
    "static_path": os.path.join(os.path.dirname(__file__), "static"),
  }
  application = tornado.web.application(
    handlers=[
      (r"/url", urlhandler),
      (r"/url2", url2handler),
      (r"/url3", url3handler),
    ],
    debug=true,
    **settings,
  )
  return application


if __name__ == '__main__':
  parse_command_line()
  app = create_app()
  server = tornado.httpserver.httpserver(app)
  server.listen(options.port)
  asyncio.get_event_loop().run_forever()

apps.py

import tornado.web
from manager_handler import gen_qrcode, gen_qrcode_obj,gen_qrcode_buf


class basehandler(tornado.web.requesthandler):
  pass


class urlhandler(basehandler):
  def get(self):
    # 获取链接
    self.render('qrcode.html', title='url', data='url-提交', img_stream='')

  async def post(self):
    # 生成二维码
    url = self.get_argument('url_str')

    # url转换二维码
    img_stream = gen_qrcode(url)
    await self.render('qrcode.html', title='qrcode', data='扫码支付', img_stream=img_stream)


class url2handler(basehandler):
  def get(self):
    # 获取链接
    self.render('qrcode.html', title='url', data='url-提交', img_stream='')

  async def post(self):
    # 生成二维码
    url = self.get_argument('url_str')

    # url转换二维码
    img_stream = gen_qrcode_obj(url=url)
    # await self.render('qrcode.html', title='qrcode', data='扫码支付', img_stream=img_stream)
    self.set_header('content_type', 'image/jpg')
    self.set_header('content_length', len(img_stream))
    self.write(img_stream)


class url3handler(basehandelr):
  def get(self):
    self.render('qrcode.html', title='url', data='url-提交', img_stream='')

  def post(self):
    url = self.get_argument('url')
    img_stream = gen_qrcode_buf(url)
    self.set_header('content-type', 'image/png')
    self.write(img_stream)

manager_handler.py

import qrcode
import io
import base64
import time


def gen_qrcode(url):
  """
  方式1: url转换二维码
  :param url: 转换二维码的url
  :return: base64编码后的 二进制流 二维码数据
  """
  qr = qrcode.make(url)
  buf = io.bytesio()
  qr.save(buf)
  img_buf = buf.getvalue()
  img_stream = base64.b64encode(img_buf)
  return img_stream


def gen_qrcode_obj(version=1, box_size=10, border=4, url=none):
  """
  方式2: url转换二维码(图片流传输, template需要指明 data:base64编码)
  :param version:
  :param box_size:
  :param border:
  :return:
  """
  qr = qrcode.qrcode(
    version=version,
    error_correction=qrcode.constants.error_correct_l,
    box_size=box_size,
    border=border,
  )

  url = "https://www.12dms.com" if url is none else url
  save_name = "./" + "qrcode" + str(time.time()) + ".png"

  qr.add_data(url)
  qr.make()
  img = qr.make_image()
  img.save(save_name.encode())
  with open(save_name, 'rb') as img_f:
    img_stream = img_f.read()
    img_stream = base64.b64encode(img_stream)
    print(img_stream)
  return img_stream

def gen_qrcode_buf(words):
  qr = qrcode.make(words)
  buf = io.bytesio()
  qr.save(buf, 'png')
  qr_buf = buf.getvalue()
  # img_stream = base64.b64encode(qr_buf)
  return qr_buf

base.html

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>{% block title %}{% end %}</title>
  {% block head %}{% end %}
</head>

<body>
  <h1 style="text-align: center">
    {% block h1 %}{{ data }}{% end %}
  </h1>
  {% block content %}{% end %}
</body>
</html>

qrcode.html

{% extends "base.html" %}

{% block title %}
  {{ title }}
{% end %}

{% block h1 %}
  {{ data }}
{% end %}


{% block content %}
  <form method="post" action="" >
    <p>
      输入待转换的url:<input name="url_str"/>
      <br>
{#      {{ img_stream }}#}
      {% if img_stream %}
        <img style="width:180px" src="data:;base64,{{ img_stream }}" alt="">
      {% end %}
    </p>
    <br>
    <input id="submit" type="submit" value="生成二维码">
  </form>
{% end %}

以上就是python-图片流传输的思路及示例(url转换二维码)的详细内容,更多关于python 图片流传输的资料请关注其它相关文章!