Programmatically convert Word files to PDF: an efficient and economical method

Challenge

Converting Word (.doc) files to PDF format is a common need in many applications. However, finding a clean, cost-effective programming solution can be challenging. Open source options often lack SDKs, while proprietary solutions are often overpriced.

Solution

To address this challenge, here are two programming approaches:

Use a Foreach loop

This solution resolves an issue in previous code using a for loop. This problem can be solved using a foreach loop implementation code as shown below:

int j = 0;
foreach (Microsoft.Office.Interop.Word.Page p in pane.Pages)
{
    var bits = p.EnhMetaFileBits;
    var target = path1 + j.ToString() + "_image.doc";
    try
    {
        using (var ms = new MemoryStream((byte[])(bits)))
        {
            var image = System.Drawing.Image.FromStream(ms);
            var pngTarget = Path.ChangeExtension(target, "png");
            image.Save(pngTarget, System.Drawing.Imaging.ImageFormat.Png);
        }
    }
    catch (System.Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
    j++;
}

Use Microsoft Word Interop

This solution utilizes Microsoft Word Interop to achieve the conversion:

using Microsoft.Office.Interop.Word;
using System;
using System.IO;

// ...其他using語(yǔ)句...

// 創(chuàng)建新的Microsoft Word應(yīng)用程序?qū)ο?Microsoft.Office.Interop.Word.Application word = new Microsoft.Office.Interop.Word.Application();

// C#沒(méi)有可選參數(shù)，所以我們需要一個(gè)虛擬值
object oMissing = System.Reflection.Missing.Value;

// 獲取指定目錄中Word文件的列表
DirectoryInfo dirInfo = new DirectoryInfo(@"\server\folder");
FileInfo[] wordFiles = dirInfo.GetFiles("*.doc");

word.Visible = false;
word.ScreenUpdating = false;

foreach (FileInfo wordFile in wordFiles)
{
    // 轉(zhuǎn)換為Object類型以用于word Open方法
    Object filename = (Object)wordFile.FullName;

    // 使用虛擬值作為可選參數(shù)的占位符
    Document doc = word.Documents.Open(ref filename, ref oMissing,
        ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing,
        ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing,
        ref oMissing, ref oMissing, ref oMissing, ref oMissing);
    doc.Activate();

    object outputFileName = wordFile.FullName.Replace(".doc", ".pdf");
    object fileFormat = WdSaveFormat.wdFormatPDF;

    // 將文檔保存為PDF格式
    doc.SaveAs(ref outputFileName,
        ref fileFormat, ref oMissing, ref oMissing,
        ref oMissing, ref oMissing, ref oMissing, ref oMissing,
        ref oMissing, ref oMissing, ref oMissing, ref oMissing,
        ref oMissing, ref oMissing, ref oMissing, ref oMissing);

    // 關(guān)閉Word文檔，但保持Word應(yīng)用程序打開(kāi)。
    // doc必須轉(zhuǎn)換為_(kāi)Document類型，以便找到正確的Close方法。
    object saveChanges = WdSaveOptions.wdDoNotSaveChanges;
    ((_Document)doc).Close(ref saveChanges, ref oMissing, ref oMissing);
    doc = null;
}

// word必須轉(zhuǎn)換為_(kāi)Application類型，以便找到正確的Quit方法。
((_Application)word).Quit(ref oMissing, ref oMissing, ref oMissing);
word = null;

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