htmltopdf.go

package htmltopdf

import (
	"bytes"
	"io/ioutil"

  // import the main library what we use
	"github.com/SebastiaanKlippert/go-wkhtmltopdf"
)

// define the path of the wkhtmltopdf
const path = "/usr/local/bin/wkhtmltopdf"

func Example(file string, pdfFile string) error {
  // read the html content
	html, err := ioutil.ReadFile(file)
	if err != nil {
		return err
	}

  // set the predefined path in the wkhtmltopdf's global state
	wkhtmltopdf.SetPath(path)

  // create a new page based on the HTML
  page := wkhtmltopdf.NewPageReader(bytes.NewReader(html))
	page.NoBackground.Set(true)
	page.DisableExternalLinks.Set(false)
  
  // create a new instance of the PDF generator 
	pdfg, err := wkhtmltopdf.NewPDFGenerator()
	if err != nil {
		return err
	}
	
  // add page to the PDF generator
	pdfg.AddPage(page)
  
  // set dpi of the content
	pdfg.Dpi.Set(350)
  
  // set margins to zero at all direction
	pdfg.MarginBottom.Set(0)
	pdfg.MarginTop.Set(0)
	pdfg.MarginLeft.Set(0)
	pdfg.MarginRight.Set(0)

  // create the exact pdf
	err = pdfg.Create()
	if err != nil {
		return err
	}

  // write it into a file
	err = pdfg.WriteFile(pdfFile)
	if err != nil {
		return err
	}

	return nil
}