Python提供了众多的PDF支持库,本文是在Python3环境下,试用了两个库来完成PDF的生成的功能。PyPDF对于读取PDF支持较好,但是没找到生成多层PDF的方法。Reportlab看起来更成熟,能够利用Canvas很方便的生成多层PDF,这样就能够实现图片扫描上来的内容也可以进行内容搜索的目标。
Reportlab
生成双层PDF
双层PDF应用PDF中的Canvas概念,先画文字,最后将图片画上去,这样就是两层的PDF。
1 | import os |
PyPDF2
读取PDF
1 | from PyPDF2 import PdfFileWriter, PdfFileReader |
但是PyPDF获取PDF内容有很多问题,可以看这个问题列表。文档中也有说明。
| extractText(self) | ## | # Locate all text drawing commands, in the order they are provided in the | # content stream, and extract the text. This works well for some PDF | # files, but poorly for others, depending on the generator used. This will | # be refined in the future. Do not rely on the order of text coming out of | # this function, as it will change if this function is made more | # sophisticated. | #
| # Stability: Added in v1.7, will exist for all future v1.x releases. May | # be overhauled to provide more ordered text in the future. | # @return a unicode string object
参考资料:
1、PDF 1.0
2、PyPDF 2
3、PyPDF2 Homepage
4、PyPDF2 Documentation
5、python name ‘file’ is not defined的解决办法
6、ReportLab
7、用Python/reportlab生成PDF
8、Writing Pdf with Python: Add image