How to generate and convert PDF documents using Golang

With the continuous development of the Internet and the expansion of application scenarios, the storage and transmission of documents have become more and more important. As a cross-platform, high-quality document format, PDF is widely used in various fields.

In actual development, we often need to convert data into PDF documents, such as generating reports, printing contracts, etc. This article will introduce how to use Golang language to convert PDF documents.

1. Golang operation PDF
Golang is an advanced programming language. Its syntax is simple, flexible and efficient, and it is very suitable for processing data and documents. Golang also provides many third-party libraries to operate PDF documents, such as GoFPDF, UniPDF, Gopdf, etc.

Among them, GoFPDF is a widely used Golang PDF library. It provides several commonly used ways to generate PDF documents, such as from HTML files, csv files or custom formats.

2. Install and use GoFPDF
GoFPDF is an open source PDF library based on Golang, which can be used to generate PDF documents. It supports multiple languages ​​and can generate high-quality PDF documents in Chinese, Korean, Japanese, etc. .

1. Install GoFPDF

To use GoFPDF, you need to install it first. You can use the go get command:

$ go get github.com/jung-kurt/gofpdf

2. Basic usage

After the installation is complete, you can use GoFPDF to generate PDF documents. The following example demonstrates how to create a simple PDF document using GoFPDF:

package main

import (
    "github.com/jung-kurt/gofpdf"
)

func main() {
    pdf := gofpdf.New("P", "mm", "A4", "")

    pdf.AddPage()

    pdf.SetFont("Arial", "B", 16)
    pdf.Cell(40, 10, "Hello, world.")

    pdf.OutputFileAndClose("hello.pdf")
}

This example creates a new PDF document, sets the page size to A4, and adds one page. Then the font, size and color are set and a line of text is printed on the page. Finally, save the PDF document to a file.

3. Convert PDF
In addition to using GoFPDF to generate PDF documents, you can also use some other third-party libraries to convert PDF documents.

Among them, UniPDF is a powerful PDF processing library that can convert PDF documents into TXT, HTML, XML, JSON and other formats. The following functions can be achieved using UniPDF:

1. Extract PDF page content
2. Analyze PDF metadata
3. Convert PDF to text
4. Convert PDF to HTML
5. Extract PDF images

The following example demonstrates how to use UniPDF to convert a PDF document to TXT:

package main

import (
    "fmt"
    "os"

    "github.com/unidoc/unipdf/v3/extractor"
)

func main() {
    if len(os.Args) < 2 {
        fmt.Printf("Usage: %s <input.pdf>\n", os.Args[0])
        os.Exit(1)
    }

    filename := os.Args[1]
    ex, err := extractor.New(filename)
    if err != nil {
        fmt.Printf("Error: %v\n", err)
        os.Exit(1)
    }

    text, err := ex.ExtractText()
    if err != nil {
        fmt.Printf("Error: %v\n", err)
        os.Exit(1)
    }

    fmt.Println(text)
}

This example specifies the input PDF via command line parameters document, and then use UniPDF's extractor package to extract text from the PDF document. Finally, output the extracted text to the console.

4. Summary
Golang is a very useful programming language that can be used to process various data and documents. This article introduces how to use Golang to generate and convert PDF documents, among which GoFPDF and UniPDF are two commonly used PDF processing libraries.

In addition to these libraries, there are many other PDF processing libraries, such as Gopdf, Gofpdf, etc. Developers can choose the appropriate library to process PDF documents based on actual needs.

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