通过ole将docx转换为pdf

package main

import (
	"log"
	"os"
	"path/filepath"

	ole "github.com/go-ole/go-ole"
	"github.com/go-ole/go-ole/oleutil"
)

// NOTE: This example can only run on Windows and requires that Word be installed.

func main() {
	ole.CoInitialize(0)
	defer ole.CoUninitialize()

	// cmd, _ := os.Getwd()
	allArgs := os.Args[1:]
	for _, arg := range allArgs {
		files, _ := filepath.Glob(arg)
		for _, file := range files {
			ext := filepath.Ext(file)
			newFile := file[:len(file)-len(ext)] + ".pdf"
			log.Print(newFile)
			// err := ConvertToPDF(filepath.Join(cmd, file), filepath.Join(cmd, newFile))
			err := ConvertToPDF(file, newFile)
			if err != nil {
				log.Printf("error creating Word object: %s", err)
			}
		}
	}
}

// ConvertToPDF uses go-ole to convert a docx to a PDF using the Word application
func ConvertToPDF(source, destination string) error {
	iunk, err := oleutil.CreateObject("Word.Application")
	if err != nil {
		return err
	}

	word := iunk.MustQueryInterface(ole.IID_IDispatch)
	defer word.Release()

	// opening then saving works due to the call to doc.Settings.SetUpdateFieldsOnOpen(true) above

	docs := oleutil.MustGetProperty(word, "Documents").ToIDispatch()
	wordDoc := oleutil.MustCallMethod(docs, "Open", source).ToIDispatch()

	// file format constant comes from https://msdn.microsoft.com/en-us/vba/word-vba/articles/wdsaveformat-enumeration-word
	const wdFormatPDF = 17
	oleutil.MustCallMethod(wordDoc, "SaveAs2", destination, wdFormatPDF)
	oleutil.MustCallMethod(wordDoc, "Close")
	oleutil.MustCallMethod(word, "Quit")
	return nil
}

不过，代码不太稳定，时不时抛出CoInitialize异常，导致转换失败。