使用 iTextSharp 5.5.8 将 html 转换为 PDF 时不显示希伯来语内容？

Question

我正在使用以下代码使用 iTextSharp

将 Html 文件转换为 Pdf

    Document doc = new Document(iTextSharp.text.PageSize.A4, 10, 20, 5, 35);
    var writer = PdfWriter.GetInstance(doc, new FileStream(savePath, FileMode.Create));

    var xmlWorkerFontProvider = new XMLWorkerFontProvider();
    var cssAppliers = new CssAppliersImpl(new MyFontProvider());
    CssFilesImpl cssFiles = new CssFilesImpl();
    StyleAttrCSSResolver cssResolver = new StyleAttrCSSResolver(cssFiles);

    HtmlPipelineContext htmlContext = new HtmlPipelineContext(cssAppliers);
    htmlContext.SetTagFactory(Tags.GetHtmlTagProcessorFactory());
    htmlContext.SetImageProvider(new ITextImageHandler());

    IPipeline pipeline = new CssResolverPipeline(cssResolver, new HtmlPipeline(htmlContext, new PdfWriterPipeline(doc, writer)));
    XMLWorker worker = new XMLWorker(pipeline, true);
    XMLParser xmlParser = new XMLParser(true, worker, Encoding.Unicode);

    doc.Open();
    doc.NewPage();
    xmlParser.Parse(new StringReader(htmlString.ToString()));
    doc.Close();

对于英文内容，这工作正常。但如果内容是希伯来语，则 PDF 中不会显示文本。

我已经在 Stack-overflow 上检查了与此相关的其他答案，但他们似乎使用了 HtmlParser，但已弃用。所以我不想用那个。

如果还有其他需要，请告诉我。谢谢你的时间。

编辑：阅读评论后，我也尝试设置字体。但仍然没有运气。下面是更新后的代码。

 Document document = new Document();

        PdfWriter writer =
            PdfWriter.GetInstance(document, new FileStream(savePath, FileMode.Create));

        document.Open();

        var cssResolver = new StyleAttrCSSResolver();
        XMLWorkerFontProvider fontProvider =
            new XMLWorkerFontProvider(XMLWorkerFontProvider.DONTLOOKFORFONTS);
        fontProvider.Register(@"E:\fonts\NotoSansHebrew-Regular.ttf");


        CssAppliers cssAppliers = new CssAppliersImpl(fontProvider);
        HtmlPipelineContext htmlContext = new HtmlPipelineContext(cssAppliers);
        htmlContext.SetTagFactory(Tags.GetHtmlTagProcessorFactory());
        htmlContext.SetImageProvider(new ITextImageHandler());


        PdfWriterPipeline pdf = new PdfWriterPipeline(document, writer);
        HtmlPipeline html = new HtmlPipeline(htmlContext, pdf);
        CssResolverPipeline css = new CssResolverPipeline(cssResolver, html);


        XMLWorker worker = new XMLWorker(css, true);
        XMLParser p = new XMLParser(worker);

        p.Parse(new StringReader(htmlString.ToString()));

        document.Close();

Answer 1

下面是 B运行o 的代码与一些实际 HTML 的改编。要运行您只需要下载字体 Noto Sans Hebrew 并将其放在您的桌面上。在不进行任何修改（可能文件路径除外）的情况下，尝试运行ning 这段对我有用的代码。（我针对 5.5.5 对此进行了测试，因此 5.5.8 应该绝对有效。）

var file = System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "test.pdf");
var fontFile = System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "NotoSansHebrew-Regular.ttf");
var htmlText = @"<div dir=""rtl"" style=""font-family: Noto Sans Hebrew;"">שלום עולם</div>";

using (var FS = new System.IO.FileStream(file, FileMode.Create, FileAccess.Write, FileShare.None)) {
    using (var document = new Document()) {
        using (var writer = PdfWriter.GetInstance(document, FS)) {
            document.Open();

            var cssResolver = new StyleAttrCSSResolver();
            var fontProvider = new XMLWorkerFontProvider(XMLWorkerFontProvider.DONTLOOKFORFONTS);
            fontProvider.Register(fontFile);
            var cssAppliers = new CssAppliersImpl(fontProvider);
            var htmlContext = new HtmlPipelineContext(cssAppliers);
            htmlContext.SetTagFactory(Tags.GetHtmlTagProcessorFactory());

            var pdf = new PdfWriterPipeline(document, writer);
            var html = new HtmlPipeline(htmlContext, pdf);
            var css = new CssResolverPipeline(cssResolver, html);


            var worker = new XMLWorker(css, true);
            var p = new XMLParser(worker);

            using (var ms = new System.IO.MemoryStream(System.Text.Encoding.UTF8.GetBytes(htmlText))) {
                using (var sr = new StreamReader(ms)) {
                    p.Parse(sr);
                }
            }

            document.Close();
        }
    }
}

整个事情的诀窍是在您的 HTML 中获取字体文件中的准确字体名称。有时令人困惑的是，字体实际上可以包含一堆名称。字体越旧，它就越有可能拥有这些。如果我没记错的话，iText 有一些用于确定字体名称的启发式方法，但如果您想安全地使用它，您也可以使用别名并随意调用它。例如，您可以将 HTML 更改为：

var htmlText = @"<div dir=""rtl"" style=""font-family: Gerp;"">שלום עולם</div>";

只要您在注册字体时使用别名，一切都会正常进行：

fontProvider.Register(fontFile, "Gerp");

使用 iTextSharp 5.5.8 将 html 转换为 PDF 时不显示希伯来语内容？

Hebrew content not displayed when converting html to PDF using iTextSharp 5.5.8?

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html-to-pdf