Python微信公众号后台开发<004>：图片上传及返回
<p>你绝对在朋友群看到过类似这样的图片信息：</p><p><img class="rich_pages lazyload" alt="" data-ratio="1.47098976109215" data-s="300,640" data-type="png" data-w="293" data-src="https://mmbiz.qpic.cn/mmbiz_png/daO6rm02505Zhd0HvE0ZVzm86YkCHeiaWW38GLHn0nmylUkLlnRWf6icNiauZfrtHiaDR3jyQuKPVqWcsibnR6iaTgtg/640?wx_fmt=png"></p>
<p> </p>
<p>虽然大家都知道是假的，但就是爱玩，同时也给公众号引来了大量粉丝。</p>
<p>对于公众号，有时我们会需要返回图片，那么今天就说说怎么成功的返回图片呢？</p>
<p>主要流程</p>
<pre>获取图片</pre>
<pre>图片处理，上传</pre>
<pre>返回图片</pre>
<p> </p>
<p>首先我们需要获取图片的信息，通过@robot.image获取用户图片信息</p>
<div class="cnblogs_Highlighter">
<pre class="brush:python;gutter:true;"># 用户发送图片
@robot.image
def blog(message,session
print(dir(message))
print(message.__dict__)
print("msg", message.img)</pre>
</div>
<p> </p>
<p>我们关心的是图片的下载路径：message.img</p>
<p class="p1"> </p>
<p><strong>获取图片</strong></p>
<p>通过图片路径下载图片：</p>
<pre><code class="hljs python"></code></pre>
<div class="cnblogs_Highlighter">
<pre class="brush:python;gutter:true;">def request_download(img_url, img_save_path):
import requests
r = requests.get(img_url)
with open(img_save_path, 'wb') as f:
f.write(r.content)
</pre>
</div>
<p> </p>
<p><strong>图片处理及上传</strong></p>
<p>图片处理：这里自己想怎么处理就怎么处理吧，用Python给头像加上圣诞帽或圣诞老人小图标</p>
<p> </p>
<p>图片上传：</p>
<p>上传临时素材接口，获取临时图片的media_id返回图片。</p>
<p> </p>
<p>通过调用官方的上传临时素材接口(我这里图片只做临时返回处理，没必要永久保存)</p>
<p> </p>
<p><img class="rich_pages lazyload" alt="" data-ratio="0.8783068783068783" data-s="300,640" data-type="png" data-w="756" data-src="https://mmbiz.qpic.cn/mmbiz_png/daO6rm02505Zhd0HvE0ZVzm86YkCHeiaWtKacAQ2MLAlLJuj4CnzNbD9LibJDy1A3IO8TIvpr7iaic8UDgehJ7TfZg/640?wx_fmt=png"></p>
<p> </p>
<p>token值是有时效性，官方建议不要每次使用都重新获取(后面会放缓存)</p>
<div class="cnblogs_Highlighter">
<pre class="brush:python;gutter:true;">def get_access_token(appid, secret):
'''获取access_token,100分钟刷新一次'''
url = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={}&secret={}'.format(appid, secret)
r = requests.get(url)
parse_json = json.loads(r.content.decode())
token = parse_json['access_token']
return token
def img_upload(mediaType, name):
token = get_access_token(app_id, secret)
url = "https://api.weixin.qq.com/cgi-bin/media/upload?access_token=%s&type=%s" % (token, mediaType)
files = {'media': open('{}'.format(name), 'rb')}
r = requests.post(url, files=files)
parse_json = json.loads(r.content.decode())
return parse_json['media_id']
</pre>
</div>
<p> </p>
<p> </p>
<p><strong>返回图片</strong></p>
<div class="cnblogs_Highlighter">
<pre class="brush:python;gutter:true;">reply = ImageReply(media_id=media_id, message=message)
return reply
</pre>
</div>
<p> </p>
<p>这样一个完整的图片获取，下载、处理、上传、返回就完成了。</p>
<div class="cnblogs_Highlighter">
<pre class="brush:python;gutter:true;"># 用户发送图片
@robot.image
def blog(message,session):
changdu = str(len(session))
print("changdu", session)
# 保证图片名称唯一
uuid = create_uuid()
img_url = message.img
img_path = "./Christmas_Hat/Image/" + uuid + ".png"
img_outPath = "./Christmas_Hat/Image/out" + uuid + ".png"
# print("msg", message.img)
# print(dir(message)) # 获取对象所有属性
# print(message.__dict__)
# print("\n"+message.MediaId)
# 下载图片
request_download(img_url, img_path)
# 图片处理
add_hat(img_path, img_outPath)
# 上传至服务器
media_id = img_upload("image", img_outPath)
# message.MediaId = media_id
# 返回信息
reply = ImageReply(media_id=media_id, message=message)
return reply
</pre>
</div>
<p> </p>
<pre><code class="hljs python"><span class="hljs-comment"><span style="font-family: "PingFang SC", "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 14px"> </span></span></code></pre>
<p><img class="rich_pages lazyload" alt="" data-ratio="1.7786666666666666" data-s="300,640" data-type="png" data-w="750" data-src="https://mmbiz.qpic.cn/mmbiz_png/daO6rm02505Zhd0HvE0ZVzm86YkCHeiaWIzOS8jWcRpP0Jkcm5D1uYvibO6jGsESglwYicvvQbDBcchDPEY5MR72w/640?wx_fmt=png"></p>
<p> </p>
<p>微信公众号后台开发：<br>Python微信公众号后台开发教程<001>--搭建基础服务器<br>Python微信公众号后台开发<002>-被关注回复、关键词回复、收到消息回复</p>
<p>Python微信公众号后台开发<003>：自定义菜单</p>
<p> </p>
<p><img class="rich_pages lazyload" alt="" data-ratio="0.5415430267062314" data-s="300,640" data-type="png" data-w="1348" data-src="https://mmbiz.qpic.cn/mmbiz_png/daO6rm02506LuHPesNyPJ9utdRnPaqO6Fwa61ZlsxbenVXY2icbJNyDbGout3OkGkmGaz6wqdLZeGuIl8VUHjxw/640?wx_fmt=png"></p><br><br>
来源：https://www.cnblogs.com/blogs/p/12156546.html
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