Question

我正在尝试创建一个将上传的图像转换为pdf文件的烧瓶应用程序。我可以使用下面的代码生成带有图像的PDF。如何从谷歌应用引擎上托管的Flask返回生成的PDF？

from fpdf import FPDF
pdf = FPDF()
img = input('enter file name')
g = img + '.jpg'
pdf.add_page()
pdf.image(g, 50, 50)
pdf.output(img + '.pdf', 'F')

下面是在blobstore中上传和存储图像的代码

from flask import Flask, redirect, render_template, request, Response, url_for
from google.appengine.ext import ndb
from google.appengine.api import images
from fpdf import FPDF
import os

app = Flask(__name__)


class Image(ndb.Model):
    blob = ndb.BlobProperty()
    mimetype = ndb.StringProperty()
    alt = ndb.StringProperty()
    caption = ndb.TextProperty()


@app.route('/')
def render_form():
    return render_template('/form.html')


@app.route('/upload', methods=['POST'])
def handle_upload():
    image = Image(
        alt=request.form.get('alt'),
        caption=request.form.get('caption')
    )
    uploaded_file = request.files.get('file')
    image.mimetype = uploaded_file.mimetype
    image_data = uploaded_file.stream.read()
    image.blob = images.resize(image_data, 256, 256)
    image.put()
    return redirect(url_for('serve_image', id=image.key.urlsafe()))



@app.route('/img/<id>')
def serve_image(id):
    image_key = ndb.Key(urlsafe=id)
    image = image_key.get()
    return Response(image.blob, mimetype=image.mimetype)

那么如何将上传的图像文件（存储在blobstore中）转换为pdf

实际上谷歌应用引擎不允许在临时文件夹中上传图像，我们必须首先在blobstore上传，这就是为什么我要问如何将图像（存储在blobstore中）转换为pdf。请帮助我

在Google应用引擎上返回在Flask中使用FPDF生成的PDF

0 个答案: