How to use Golang to modify PDF documents

Golang is an efficient programming language designed to simplify the programming process and improve code readability and maintainability. Many people may not know that Golang can also be used to handle the editing of PDF documents. In this article, we will introduce how to use Golang to modify PDF documents.

1. Download and install Go language

First, we need to download and install Golang in order to use it on the local machine. Download the version corresponding to your operating system and processor architecture, such as Windows or Linux, on the official website https://golang.org/dl/. After the installation is complete, configure the system environment variables to ensure that Golang can be used in the command line. Run "Go version" in the command line. If the current Golang version number is prompted, it means the installation has been successful.

2. Install the go-pdfcpu library

Next, we need to install the go-pdfcpu library, which is a Golang library for processing PDF documents. Run "Go get github.com/pdfcpu/pdfcpu" in the command line to automatically download and install it.

3. Use the go-pdfcpu library to modify PDF documents

After the installation is complete, we can start using the go-pdfcpu library to modify PDF documents. Here is an example showing how to add a page to a PDF document:

package main

import (

"fmt"
"github.com/pdfcpu/pdfcpu/pkg/api"
"github.com/pdfcpu/pdfcpu/pkg/pdfcpu"

)

func main() {

conf := pdfcpu.NewDefaultConfiguration()
inFile := "input.pdf"
outFile := "output.pdf"

// 添加一个新的页面
pageOps := []*pdfcpu.PageInsert{{0, true}}
if err := api.InsertPages(conf, inFile, outFile, pageOps); err != nil {
    fmt.Println(err)
}
fmt.Println("插入新页面成功！")

}

Execute this code to insert a blank page before the first page of the original document. It is worth noting that we need to specify two parameters: the original document path and the output file path.

In addition to adding pages, the go-pdfcpu library also supports a variety of operations on PDF documents, including cropping, merging, splitting, rotating, etc. We can freely combine these operations to achieve modifications to the document.

4. Conclusion

In this article, we have learned how to use Golang and its corresponding library go-pdfcpu to modify PDF documents. In this way, we can edit the document according to our needs and apply it to various application scenarios. Hope this article can be helpful to you!

The above is the detailed content of How to use Golang to modify PDF documents. For more information, please follow other related articles on the PHP Chinese website!