In a nutshell PDF Reader it is a simple Go library for reading PDF files which enables text exctraction being in the form of Plain Text or Formatted Text. The very first developer of this library it was https://github.com/rsc/pdf, being forked and improved by https://github.com/ledongthuc/pdf. Cloudresty has forked ledongthuc's library with the aim to maintain and improve it further.
Features
- Get plain text content (without format)
- Get content (including all font and formatting information)
go get -u github.com/cloudresty/pdf
Go Read PDF - Plain Text
package main
import (
"bytes"
"fmt"
"github.com/cloudresty/pdf"
)
//
// Main Function
//
func main() {
pdf.DebugOn = true
//
// Read PDF File
//
pdfText, errReadPDF := readPDF("file.pdf")
if errReadPDF != nil {
panic(errReadPDF)
}
fmt.Println(pdfText)
return
}
//
// Read PDF Function
//
func readPDF(path string) (string, error) {
//
// Open PDF File
//
f, r, errPDFOpen := pdf.Open(path)
defer f.Close()
if errPDFOpen != nil {
return "", errPDFOpen
}
//
// Extract Plain Text
//
var buf bytes.Buffer
b, errGetPlainText := r.GetPlainText()
if errGetPlainText != nil {
return "", errGetPlainText
}
buf.ReadFrom(b)
return buf.String(), nil
}Go Read PDF - Formatted Text
//
// Read PDF Function (standalone)
//
func readPDF(path string) (string, error) {
//
// Open PDF File
//
f, r, errPDFOpen := pdf.Open(path)
defer f.Close()
if errPDFOpen != nil {
return "", errPDFOpen
}
//
// Page Count
//
totalPage := r.NumPage()
//
// Loop Through Pages
//
for pageIndex := 1; pageIndex <= totalPage; pageIndex++ {
p := r.Page(pageIndex)
if p.V.IsNull() {
continue
}
//
// Extract Formatted Text
//
var lastTextStyle pdf.Text
texts := p.Content().Text
for _, text := range texts {
if isSameSentence(text, lastTextStyle) {
lastTextStyle.S = lastTextStyle.S + text.S
} else {
fmt.Printf("Font: %s, Font-size: %f, x: %f, y: %f, content: %s \n", lastTextStyle.Font, lastTextStyle.FontSize, lastTextStyle.X, lastTextStyle.Y, lastTextStyle.S)
lastTextStyle = text
}
}
}
return "", nil
}Go Read PDF - Text Grouped by Rows
package main
import (
"fmt"
"os"
"github.com/cloudresty/pdf"
)
//
// Main Function
//
func main() {
//
// Read Local PDF File
//
content, errReadPDF := readPDF(os.Args[1])
if errReadPDF != nil {
panic(errReadPDF)
}
fmt.Println(content)
return
}
//
// Read PDF Function
//
func readPDF(path string) (string, error) {
//
// Open PDF File
//
f, r, errReadPDF := pdf.Open(path)
defer func() {
_ = f.Close()
}()
if errReadPDF != nil {
return "", errReadPDF
}
//
// Page Count
//
totalPage := r.NumPage()
//
// Loop Through Pages
//
for pageIndex := 1; pageIndex <= totalPage; pageIndex++ {
p := r.Page(pageIndex)
if p.V.IsNull() {
continue
}
//
// Get Rows
//
rows, _ := p.GetTextByRow()
for _, row := range rows {
println("Row: ", row.Position)
for _, word := range row.Content {
fmt.Println(word.S)
}
}
}
return "", nil
}