Python + Wand.Image - 使用连续的 pagenumber.jpg 名称将输出图像保存到 AWS

Question

我正在编写一个脚本，该脚本可以将来自 Internet 的 PDF(不将其保存到磁盘)转换为一系列 jpeg，然后将 JPG 保存到 AWS s3。

不幸的是，下面的代码仅将 PDF 的第一页以 JPG 格式保存到 AWS。关于如何修改它以使用顺序文件名将图像保存到 AWS 的任何想法？

from urllib2 import urlopen
from wand.image import Image
from io import BytesIO
import boto3
    s3 = boto3.client(
        's3',
        aws_access_key_id='mykey',
        aws_secret_access_key='mykey'
    )

    bucket_name = 'testbucketAWS323'
    #location on disk

    #file prefix
test_id = 'example'
f = urlopen("https://s3.us-east-2.amazonaws.com/converted1jpgs/example.pdf")
bytes_io_file = BytesIO()
with Image(file=f) as img:
    print('pages = ', len(img.sequence))
    with img.convert('png') as converted:
        bytes_io_file = BytesIO(converted.make_blob('jpeg'))
      #code below should take 'converted' object, and save it to AWS as jpg. 
        s3.upload_fileobj(bytes_io_file, bucket_name, "assssd.jpg")
        print 'done'

Answer 1

只需枚举文档页面 (wand.image.Image.sequence) 即可获取页码和资源。将页面资源复制到 Image 的新实例后，直接导出 blob，无需担心中间转换。

from urllib2 import urlopen
from wand.image import Image
from io import BytesIO
import boto3

# ....

url = 'https://s3.us-east-2.amazonaws.com/converted1jpgs/example.pdf'
resource = urlopen(url)
with Image(file=resource) as document:
    for page_number, page in enumerate(document.sequence):
        with Image(page) as img:
            bytes_io_file = BytesIO(img.make_blob('JPEG'))
            filename = 'output_{0}.jpg'.format(page_number)
            s3.upload_fileobj(bytes_io_file, bucket_name, filename)