Do you charge for PDF merging software? Programmers make one by themselves

lately , Fish skin is in trouble , Need to be right Thousands PDF The documents shall be processed uniformly , For example, delete all PDF The first few pages of 、 Or to all PDF Add cover, etc .

If it's a few files , It can be operated manually one by one , But for thousands of files , We must use software to realize automatic batch processing .

I also searched a lot on the Internet PDF Batch processing software , There are a lot to meet the demand , But the problem is , There is a charge for everything ！ and , One is more expensive than the other ！

As a programmer , Why not do it yourself 、 Have ample food and clothing , Develop a batch process by yourself PDF File tool ？

To determine the ！ I don't just have to do , And live broadcast ！

Why do you choose to develop it yourself ？

On the one hand, my needs are relatively simple , In addition, there are now various programming class libraries , Presumably, the cost of self-development will not be very high , At least it is better than manual processing one by one PDF A lot better .

On the other hand, I haven't written gadgets for a long time , It's itchy in my heart , Want to practice .

Of course , And the most important point , It is to bring all the friends in the live studio to experience the fun of programming ~

Let's get started ！

The production process

Before that , I don't know what to do PDF Class library of , So it's really starting from scratch research + Development ！

The whole development process lasted about half an hour , If you exclude the installation environment 、 Find source file 、 Live communication and other things take up time , Probably 10 Minutes to complete , It's really very simple .

Technology selection

First , To choose which programming language and class library to use to write programs . Mention gadgets and scripts , The first thing I think of is using Python, May be Python There are too many advertisements for file processing, haha . There is one saying. ,Python The grammar of is simple , Rich class library , It is really very convenient to use it to develop gadgets .

How to deal with PDF What about the documents ？ There must be a tool class library developed by others on the Internet ！ So I went to GitHub A simple search on , Is there any support for PDF modify 、 Merge 、 Page deleted Library , Sure enough, I found it PyPDF2, Read the project introduction , It's perfect for my needs , And the usage is very simple .

therefore , To determine the , Use Python Language + PyPDF2 Development .

install Python And the class library

Python The installation of is very simple , Download the installation package of the corresponding operating system directly from the official website . It should be noted that , In the installation Python when , It is better to check automatic environment variable configuration , It saves the trouble of operation .

Check add environment variables automatically

Install well Python after , You can enter commands on the console to verify that the installation is successful .

Because our tools and programs depend on PyPDF2 Class library , So use Python Self contained installation tools pip To install it .

pip install PyPDF2

After installing these , Start writing code .

Write code

If you just want to implement two PDF File merge , You don't have to write a single line of code ！ because PyPDF2 The class library has already provided us with a file merge Demo, Just copy and paste it directly .

The code is as follows , It's very easy to understand ：

from PyPDF2 import PdfFileMerger

#  Define a container , Store all pages 
merger = PdfFileMerger()

#  Read the file 
input1 = open("document1.pdf", "rb")
input2 = open("document2.pdf", "rb")

#  Insert  pdf1  First three pages of 
merger.append(fileobj = input1, pages = (0,3))

#  Insert  pdf2  First page of 
merger.merge(fileobj = input2, pages = (0,1))

#  Write a new  PDF  file , Output 
output = open("document-output.pdf", "wb")
merger.write(output)

We can find any two PDF File to test , Go ahead Demo Make further changes .

After the above code runs successfully , We can support users to input the data to be merged PDF file name , And customize the second one to be spliced PDF Start page number of .

Like the first one PDF Only one cover page , the second PDF The start page of splicing is the second page , The two merge , The replacement is realized PDF The effect of the document cover .

The final code is as follows ：

from PyPDF2 import PdfFileMerger, PdfFileReader

merger = PdfFileMerger()

# input  Function accepts user input 
inputStr1 = input(" Please enter cover ")
inputStr2 = input(" Please enter pdf")
startNum = input(" Please enter pdf The start page ")

input1 = open(inputStr1, "rb")
input2 = open(inputStr2, "rb")
#  obtain  pdf  object 
pdf = PdfFileReader(input2)

#  Splicing  pdf1  First page of 
merger.append(fileobj = input1, pages = (0,1))

#  Splicing  pdf2  Second of ~ Tail page 
merger.append(fileobj = input2, pages = (int(startNum), pdf.getNumPages()))

# Write to an output PDF document
output = open("document-output.pdf", "wb")
merger.write(output)

All the above parameters can be modified , You can even Develop an interface , Users can set parameters in the input box , This makes the tool easier to use ！

debugging

In the process of development , It needs constant debugging , Here we simply verify the results , Observe PDF Whether the merger of is in line with expectations ！

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Okay , That's all PDF The process of making processing tools . For programmers , Programming languages are the best tools , We can usually use them to solve problems 、 Improve work efficiency , Can also improve their programming skills , Beauty is not true ！

Video demo ：https://www.bilibili.com/video/BV1zV411Y7AU/