如何从中提取图像。DOCX使用DocumentFormat。OpenXml。段落

Question

我需要从DOCX文件中提取文本和图像到文本文件（当然，将图像保存为图形文件）。使用下面的代码如何获取图像并将其保存为文本文件中的引用？

如果我使用：

List<ImagePart> imgPart = wordProcessingDoc.MainDocumentPart.ImageParts.ToList();

我可以得到所有的图像，但有时一个图像被用在几个地方。我找不到从列表中获取特定图像的参考。以下是取自（从DOCX提取表）的示例代码：

public static string ReadAllTextFromDocx(FileInfo fileInfo)
{
    StringBuilder stringBuilder;
    using (WordprocessingDocument wordprocessingDocument = WordprocessingDocument.Open(fileInfo.FullName, false))
    {
        NameTable nameTable = new NameTable();
        XmlNamespaceManager xmlNamespaceManager = new XmlNamespaceManager(nameTable);
        xmlNamespaceManager.AddNamespace("w", "http://schemas.openxmlformats.org/wordprocessingml/2006/main");

        string wordprocessingDocumentText;
        using (StreamReader streamReader = new StreamReader(wordprocessingDocument.MainDocumentPart.GetStream()))
        {
            wordprocessingDocumentText = streamReader.ReadToEnd();
        }

        stringBuilder = new StringBuilder(wordprocessingDocumentText.Length);

        XmlDocument xmlDocument = new XmlDocument(nameTable);
        xmlDocument.LoadXml(wordprocessingDocumentText);

        XmlNodeList paragraphNodes = xmlDocument.SelectNodes("//w:p", xmlNamespaceManager);
        foreach (XmlNode paragraphNode in paragraphNodes)
        {
            XmlNodeList textNodes = paragraphNode.SelectNodes(".//w:t | .//w:tab | .//w:br | .//w:drawing", xmlNamespaceManager);
            foreach (XmlNode textNode in textNodes)
            {
                switch (textNode.Name)
                {
                    case "w:t":
                        stringBuilder.Append(textNode.InnerText);
                        break;

                    case "w:tab":
                        stringBuilder.Append("\t");
                        break;

                    case "w:br":
                        stringBuilder.Append("\v");
                        break;
                    case "w:drawing":
                        stringBuilder.Append("----------------IMAGE HERE-------------");
                        break;
                }
            }

            stringBuilder.Append(Environment.NewLine);
        }
    }

    return stringBuilder.ToString();
}

Answer 1

您可以使用从ImagePart获取图像流。

var images = from graphic in paragraph
                .Descendants<DocumentFormat.OpenXml.Drawing.Graphic>()
            let graphicData = graphic.Descendants<DocumentFormat.OpenXml.Drawing.GraphicData>().FirstOrDefault()
            let pic = graphicData.ElementAt(0)
            let nvPicPrt = pic.ElementAt(0).FirstOrDefault()
            let blip = pic.Descendants<DocumentFormat.OpenXml.Drawing.Blip>().FirstOrDefault()
            join part in WordprocessingDocument.MainDocumentPart.Parts on blip.Embed.Value equals part
                .RelationshipId
            let image = part.OpenXmlPart as ImagePart
            select new
            {
                Id = blip.Embed,
                fileStream = image.GetStream()
            } ;

Answer 2

我在这篇文章中找到了答案：使用OpenXML替换word文档中的图像

var imageParts =from graphic in par.Descendants<DocumentFormat.OpenXml.Drawing.Graphic>()
let graphicData = graphic.Descendants<DocumentFormat.OpenXml.Drawing.GraphicData>().FirstOrDefault()
                               let pic = graphicData.ElementAt(0)
                               let nvPicPrt = pic.ElementAt(0).FirstOrDefault()
                               let blip = pic.Descendants<DocumentFormat.OpenXml.Drawing.Blip>().FirstOrDefault()
                               select new
                               {
                                   Id = blip.GetAttribute("embed", xr).Value,
                                   Filename = nvPicPrt.GetAttribute("name", xpic).Value
                               };