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) c.showPage() c.save()
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编程小技巧。
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