如何将图像写入数据存储区?

时间:2010-12-04 14:21:44

标签: python google-app-engine google-cloud-datastore

更新

systempuntoout查看评论。表单缺少提交按钮。现在一切正常。


我有这个代码,我认为会将图像写入数据存储区;但那并没有发生:

class AvatarSave(webapp.RequestHandler):
    def post(self):
        q = User.all()
        q.filter("userEmail =", "az@example.com")
        qTable = q.fetch(10)
        if qTable:
            for row in qTable:
                avatar = images.resize(self.request.get("img"), 32, 32)
                row.avatar = db.Blob(avatar)
                db.put(qTable)
        else:
            self.response.out.write("user not found")

        self.redirect('/')

日志显示图像键:

INFO     2010-12-04 13:56:26,601 dev_appserver.py:3317] "GET /img?
img_id=ag1oZWxsby0xLXdvcmxkcgsLEgRVc2VyGIABDA HTTP/1.1" 200 -

但除了断开的链接外没有显示任何内容。我在这里错过了什么?我很感激你的帮助。我在下面包含了整个脚本。谢谢!

class MainPage(webapp.RequestHandler):
    def get(self):
        siteUser = users.get_current_user()
        greeting = None        
        if siteUser:
            greeting = ("Welcome, %s! (<a href=\"%s\">sign out</a>)" %
                    (siteUser.nickname(), users.create_logout_url("/")))
        else:
            greeting = ("<a href=\"%s\">Sign in or register</a>" %
                    users.create_login_url("/"))

        self.response.out.write(greeting)            

        self.response.out.write("""
          <form action="/avatar-save" enctype="multipart/form-data" method="post">                
            <div><label>Avatar:</label></div>
            <div><input type="file" name="img"/></div>
          </form>
        </body>
      </html>""")

        query = User.all()
        query.filter("userEmail =", "az@example.com")
        query.order("-userScore")
        results = query.fetch(10)
        self.response.out.write("""<html><head><style>
                               body {font-size: small;
                                     font-family: Verdana, Helvetica, sans-serif;
                                    }</style>
                                    </head><body><ol>""")
        for result in results:
            self.response.out.write("<li>")
            self.response.out.write("<b>%s</b> %s " % (result.userName, result.userLatestComment))
            self.response.out.write("<div><img src='img?img_id=%s'></img>" % result.key())
            self.response.out.write("</li>")
        self.response.out.write("</ol></body></html>")

class Image (webapp.RequestHandler):
    def get(self):
        greeting = db.get(self.request.get("img_id"))
        if greeting.avatar:
            self.response.headers['Content-Type'] = "image/png"
            self.response.out.write(greeting.avatar)
        else:
            self.response.out.write("No image")

class AvatarSave(webapp.RequestHandler):
    def post(self):
        q = User.all()
        q.filter("userEmail =", "az@example.com")
        qTable = q.fetch(10)
        if qTable:
            for row in qTable:
                avatar = images.resize(self.request.get("img"), 32, 32)
                row.avatar = db.Blob(avatar)
                db.put(qTable)
        else:
            self.response.out.write("user not found")

        self.redirect('/')

application = webapp.WSGIApplication(
                                     [('/', MainPage),
                                      ('/img', Image),
                                      ('/avatar-save', AvatarSave),                                      
                                      ],
                                     debug=True)

def main():
    run_wsgi_app(application)

if __name__ == "__main__":
    main()

1 个答案:

答案 0 :(得分:3)

我认为您的代码缺少图片表单提交中的“提交”按钮:

self.response.out.write("""
          <form action="/avatar-save" enctype="multipart/form-data" method="post">                
            <div><label>Avatar:</label></div>
            <div><input type="file" name="img"/></div>
            <input type="submit"/>
          </form>...

我已尝试使用您的代码推断您未在问题中报告的User模型:

class User(db.Model):
    userEmail = db.EmailProperty()
    userScore = db.IntegerProperty()
    avatar = db.BlobProperty()

由于您的代码不包含创建用户的部分,因此我从开发交互式控制台创建了一个用户:

from main import User
User(userEmail='az@example.com', userScore=1).put()

然后,我已经使用az@example.com登录了,我已经上传了图片。

这是结果:
alt text

我只能说“它可以在我的机器上运行”。