Golang 切割pdf 文件并取出前三页
这里使用一个pdf 库 github.com/unidoc/unidoc
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package main
import (
"fmt"
"os"
"strconv"
pdf "github.com/unidoc/unidoc/pdf/model"
)
func init() {
// When debugging: use debug-level console logger.
//unicommon.SetLogger(unicommon.NewConsoleLogger(unicommon.LogLevelDebug))
}
func main() {
if len(os.Args) < 5 {
fmt.Printf("Usage: go run pdf_split.go input.pdf <page_from> <page_to> output.pdf\n")
os.Exit(1)
}
inputPath := os.Args[1]
strSplitFrom := os.Args[2]
splitFrom, err := strconv.Atoi(strSplitFrom)
if err != nil {
fmt.Printf("Error: %v\n", err)
os.Exit(1)
}
strSplitTo := os.Args[3]
splitTo, err := strconv.Atoi(strSplitTo)
if err != nil {
fmt.Printf("Error: %v\n", err)
os.Exit(1)
}
outputPath := os.Args[4]
err = splitPdf(inputPath, outputPath, splitFrom, splitTo)
if err != nil {
fmt.Printf("Error: %v\n", err)
os.Exit(1)
}
fmt.Printf("Complete, see output file: %s\n", outputPath)
}
func splitPdf(inputPath string, outputPath string, pageFrom int, pageTo int) error {
pdfWriter := pdf.NewPdfWriter()
f, err := os.Open(inputPath)
if err != nil {
return err
}
defer f.Close()
pdfReader, err := pdf.NewPdfReader(f)
if err != nil {
return err
}
isEncrypted, err := pdfReader.IsEncrypted()
if err != nil {
return err
}
if isEncrypted {
_, err = pdfReader.Decrypt([]byte(""))
if err != nil {
return err
}
}
numPages, err := pdfReader.GetNumPages()
if err != nil {
return err
}
if numPages < pageTo {
return err
}
for i := pageFrom; i <= pageTo; i++ {
pageNum := i
page, err := pdfReader.GetPage(pageNum)
if err != nil {
return err
}
err = pdfWriter.AddPage(page)
if err != nil {
return err
}
}
fWrite, err := os.Create(outputPath)
if err != nil {
return err
}
defer fWrite.Close()
err = pdfWriter.Write(fWrite)
if err != nil {
return err
}
return nil
}