Document to PDF using custom fonts

/*
 * This example showcases PDF generation from docx document with UniOffice package.
 */
 
package main
 
import (
	"fmt"
	"log"
	"os"
 
	unipdflicense "github.com/unidoc/unipdf/v4/common/license"
	"github.com/unidoc/unipdf/v4/model"
 
	"github.com/unidoc/unioffice/v2/common/license"
	"github.com/unidoc/unioffice/v2/document"
	"github.com/unidoc/unioffice/v2/document/convert"
)
 
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 := unipdflicense.SetMeteredKey(os.Getenv(`UNIDOC_LICENSE_API_KEY`))
	if err != nil {
		fmt.Printf("ERROR: Failed to set metered key: %v\n", err)
		fmt.Printf("Make sure to get a valid key from https://cloud.unidoc.io\n")
		fmt.Printf("If you don't have one - Grab one in the Free Tier at https://cloud.unidoc.io\n")
		panic(err)
	}
 
	// This example requires both for unioffice and unipdf.
	err = license.SetMeteredKey(os.Getenv(`UNIDOC_LICENSE_API_KEY`))
	if err != nil {
		fmt.Printf("ERROR: Failed to set metered key: %v\n", err)
		fmt.Printf("Make sure to get a valid key from https://cloud.unidoc.io\n")
		fmt.Printf("If you don't have one - Grab one in the Free Tier at https://cloud.unidoc.io\n")
		panic(err)
	}
}
 
func main() {
 
	// register all fonts from the folder
	err := convert.RegisterFontsFromDirectory("fonts/PTSans")
	if err != nil {
		log.Fatalf("Error registering fonts from the folder: %s\n", err)
	}
 
	// register fonts in more precise way
	zcoolRegular, err := model.NewCompositePdfFontFromTTFFile("fonts/ZCOOL/ZCOOLXiaoWei-Regular.ttf")
	if err != nil {
		log.Fatalf("error opening font: %s\n", err)
	}
	convert.RegisterFont("SimHei", convert.FontStyle_Regular, zcoolRegular) // we can use one font instead of other
 
	doc, err := document.Open("fonts.docx")
	if err != nil {
		log.Fatalf("error opening document: %s", err)
	}
	defer doc.Close()
	c := convert.ConvertToPdf(doc)
 
	err = c.WriteToFile("fonts.pdf")
	if err != nil {
		log.Fatalf("error converting document: %s", err)
	}
}