API การประมวลผล PDF สำหรับ Go

package main

import (
    "fmt"
    "log"

    asposepdf "github.com/aspose-pdf/aspose-pdf-go-cpp"
)

const (
    inputPDFFile      = "sample.pdf"
    outputImagePrefix = "sample_page"
    imageQuality      = 300
)

func main() {
    if err := convertPDFToImages(inputPDFFile); err != nil {
        log.Fatal(err)
    }
}

func convertPDFToImages(pdfFile string) error {
    pdfDocument, err := asposepdf.Open(pdfFile)
    if err != nil {
        return fmt.Errorf("failed to open PDF file: %w", err)
    }
    defer pdfDocument.Close()

    pageCount, err := pdfDocument.PageCount()
    if err != nil {
        return fmt.Errorf("failed to get page count: %w", err)
    }

    for pageIndex := int32(1); pageIndex <= pageCount; pageIndex++ {
        if err := savePageAsImage(pdfDocument, pageIndex); err != nil {
            return err
        }
    }
    return nil
}

func savePageAsImage(pdfDocument *asposepdf.Document, pageIndex int32) error {
    imageFileName := fmt.Sprintf("%s%d.jpg", outputImagePrefix, pageIndex)
    if err := pdfDocument.PageToJpg(pageIndex, imageQuality, imageFileName); err != nil {
        return fmt.Errorf("failed to save page %d as image: %w", pageIndex, err)
    }
    return nil
}