Python处理PDF及生成多层PDF实例代码_Python

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。

									import os

									# import urllib2

									import time

									from reportlab import platypus

									from reportlab.lib.pagesizes import letter

									from reportlab.lib.units import inch

									from reportlab.platypus import SimpleDocTemplate, Image

									from reportlab.pdfgen import canvas

									image_file = "./42.png"

									# Use Canvas to generate pdf

									c = canvas.Canvas('reportlab_canvas.pdf', pagesize=letter)

									width, height = letter

									c.setFillColorRGB(0,0.77,0.77)

									# say hello (note after rotate the y coord needs to be negative!)

									c.drawString( 3*inch, 3*inch, "Hello World")

									c.drawImage(image_file, 0 , 0)

									c.showPage()

									c.save()

PyPDF2

读取PDF

									from PyPDF2 import PdfFileWriter, PdfFileReader

									output = PdfFileWriter()

									input1 = PdfFileReader(open("jquery.pdf", "rb"))

									# print document info

									print(input1.getDocumentInfo())

									# print how many pages input1 has:

									print ("pdf_document.pdf has %d pages." % input1.getNumPages())

									# print page content

									page_content = input1.getPage(0).extractText()

									print( page_content )

									# add page 1 from input1 to output document, unchanged

									output.addPage(input1.getPage(0))

									# add page 2 from input1, but rotated clockwise 90 degrees

									output.addPage(input1.getPage(1).rotateClockwise(90))

									# finally, write "output" to document-output.pdf

									outputStream = open("PyPDF2-output.pdf", "wb")

									output.write(outputStream)

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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：http://www.cnblogs.com/cocowool/p/6756966.html?utm_source=tuicool&utm_medium=referral

Python处理PDF及生成多层PDF实例代码

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