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pdf_apply_standard.go
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/*
* PDF optimization (compression) example.
*
* Run as: go run pdf_apply_standard.go <input.pdf> <output.pdf>
*/
package main
import (
"fmt"
"log"
"os"
"time"
"github.com/unidoc/unipdf/v3/common/license"
"github.com/unidoc/unipdf/v3/model"
"github.com/unidoc/unipdf/v3/model/pdfa"
)
func init() {
// Make sure to load your metered License API key prior to using the library.
// If you need a key, you can sign up and create a free one at https://cloud.unidoc.io
err := license.SetMeteredKey(os.Getenv(`UNIDOC_LICENSE_API_KEY`))
if err != nil {
panic(err)
}
}
func main() {
args := os.Args
if len(args) < 3 {
fmt.Printf("Usage: %s INPUT_PDF_PATH OUTPUT_PDF_PATH", os.Args[0])
return
}
inputPath := args[1]
outputPath := args[2]
// Initialize starting time.
start := time.Now()
// Create reader.
reader, file, err := model.NewPdfReaderFromFile(inputPath, nil)
if err != nil {
log.Fatalf("Fail: %v\n", err)
}
defer file.Close()
// Generate a PDFWriter from PDFReader.
pdfWriter, err := reader.ToWriter(nil)
if err != nil {
log.Fatalf("Fail: %v\n", err)
}
// Apply standard PDF/A-1B.
pdfWriter.ApplyStandard(pdfa.NewProfile1B(nil))
// Create output file.
err = pdfWriter.WriteToFile(outputPath)
if err != nil {
log.Fatalf("Fail: %v\n", err)
}
duration := float64(time.Since(start)) / float64(time.Millisecond)
fmt.Printf("Processing time: %.2f ms\n", duration)
}