1.什么是PDF/UA文件
PDF/UA，即Universally Accessible PDF，该格式的PDF文件是于2012年8月以ISO标准14289-1发布的、具有普遍可访问的PDF文档标准。为带标签的PDF文档（Tagged PDF Document）和表单的开发人员和作者设定了明确的规则。（PDF/UA-1是作为PDF/UA标准的第一部分，PDF/UA-2作为PDF/UA标准的第二部分）[1]2.文件格式要求
PDF/UA在其基础上有着明确的要求，即该标准都是基于PDF标签，所有PDF/UA文档都必须以PDF标签来正确标记，并且，要求标签在语义上适当，并按逻辑顺序排列。[1]3.如何创建PDF/UA文件
PDF/UA文件作为PDF文件的一种标准格式，要创建该标准的的PDF文档，可使用调用PDF API的方法来创建。下面，是以Spire.PDF for .NET来创建的方法。注：可在Visual Studio 中通过NuGet搜索“Spire.PDF”安装dll到程序中；或者下载包（hotfix版本）到本地，手动添加本地路径下的Spire.Pdf.dll文件到程序。C#- using Spire.Pdf;
- using Spire.Pdf.Graphics;
- using Spire.Pdf.Interchange.TaggedPdf;
- using System.Drawing;
- namespace CreatePDFUAfile
- {
- class Program
- {
- static void Main(string[] args)
- {
- //创建PdfDocument类的对象
- PdfDocument doc = new PdfDocument();
- //添加一页
- doc.Pages.Add();
- //设置tab order
- doc.Pages[0].SetTabOrder(TabOrder.Structure);
- //创建PdfTaggedContent类的对象
- PdfTaggedContent taggedContent = new PdfTaggedContent(doc);
- taggedContent.SetLanguage("en-US");
- taggedContent.SetTitle("test");
- //设置PDF/UA1验证
- taggedContent.SetPdfUA1Identification();
- //创建字体、画刷
- PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Times New Roman", 10), true);
- PdfSolidBrush brush = new PdfSolidBrush(Color.Black);
- //添加要素
- PdfStructureElement article = taggedContent.StructureTreeRoot.AppendChildElement(PdfStandardStructTypes.Document);
- PdfStructureElement paragraph1 = article.AppendChildElement(PdfStandardStructTypes.Paragraph);
- PdfStructureElement span1 = paragraph1.AppendChildElement(PdfStandardStructTypes.Span);
- span1.BeginMarkedContent(doc.Pages[0]);
- PdfStringFormat format = new PdfStringFormat(PdfTextAlignment.Justify);
- doc.Pages[0].Canvas.DrawString("PDF/UA was published as ISO Standard 14289-1 in August 2012" +
- " and is by far the first complete definition " +
- "of a set of requirements for universally accessible PDF documents.",
- font, brush, new Rectangle(40, 80, 450, 80), format);
- span1.EndMarkedContent(doc.Pages[0]);
- PdfStructureElement paragraph2 = article.AppendChildElement(PdfStandardStructTypes.Paragraph);
- paragraph2.BeginMarkedContent(doc.Pages[0]);
- doc.Pages[0].Canvas.DrawString("The PDF/UA has some definite requirements at its base that act as the essence of this standard.",
- font, brush, new Rectangle(40, 120, 450, 60), format);
- paragraph2.EndMarkedContent(doc.Pages[0]);
- PdfStructureElement figure1 = article.AppendChildElement(PdfStandardStructTypes.Figure);
- //Set Alternate text
- figure1.Alt = "replacement text1";
- figure1.BeginMarkedContent(doc.Pages[0], null);
- PdfImage image = PdfImage.FromFile(@"logo.jpg");
- doc.Pages[0].Canvas.DrawImage(image, new PointF(40, 200), new SizeF(100, 100));
- figure1.EndMarkedContent(doc.Pages[0]);
- PdfStructureElement figure2 = article.AppendChildElement(PdfStandardStructTypes.Figure);
- //Set Alternate text
- figure2.Alt = "replacement text2";
- figure2.BeginMarkedContent(doc.Pages[0], null);
- doc.Pages[0].Canvas.DrawRectangle(PdfPens.Black, new Rectangle(300, 200, 100, 100));
- figure2.EndMarkedContent(doc.Pages[0]);
- //保存文档
- doc.SaveToFile("CreatePDFUAFile_result.pdf");
- System.Diagnostics.Process.Start("CreatePDFUAFile_result.pdf");
- }
- }
- }
- Imports Spire.Pdf
- Imports Spire.Pdf.Graphics
- Imports Spire.Pdf.Interchange.TaggedPdf
- Imports System.Drawing
- Namespace CreatePDFUAfile
- Class Program
- Private Shared Sub Main(args As String())
- '创建PdfDocument类的对象
- Dim doc As New PdfDocument()
- '添加一页
- doc.Pages.Add()
- '设置tab order
- doc.Pages(0).SetTabOrder(TabOrder.[Structure])
- '创建PdfTaggedContent类的对象
- Dim taggedContent As New PdfTaggedContent(doc)
- taggedContent.SetLanguage("en-US")
- taggedContent.SetTitle("test")
- '设置PDF/UA1验证
- taggedContent.SetPdfUA1Identification()
- '创建字体、画刷
- Dim font As New PdfTrueTypeFont(New Font("Times New Roman", 10), True)
- Dim brush As New PdfSolidBrush(Color.Black)
- '添加要素
- Dim article As PdfStructureElement = taggedContent.StructureTreeRoot.AppendChildElement(PdfStandardStructTypes.Document)
- Dim paragraph1 As PdfStructureElement = article.AppendChildElement(PdfStandardStructTypes.Paragraph)
- Dim span1 As PdfStructureElement = paragraph1.AppendChildElement(PdfStandardStructTypes.Span)
- span1.BeginMarkedContent(doc.Pages(0))
- Dim format As New PdfStringFormat(PdfTextAlignment.Justify)
- doc.Pages(0).Canvas.DrawString("PDF/UA was published as ISO Standard 14289-1 in August 2012" + " and is by far the first complete definition " + "of a set of requirements for universally accessible PDF documents.", font, brush, New Rectangle(40, 80, 450, 80), format)
- span1.EndMarkedContent(doc.Pages(0))
- Dim paragraph2 As PdfStructureElement = article.AppendChildElement(PdfStandardStructTypes.Paragraph)
- paragraph2.BeginMarkedContent(doc.Pages(0))
- doc.Pages(0).Canvas.DrawString("The PDF/UA has some definite requirements at its base that act as the essence of this standard.", font, brush, New Rectangle(40, 120, 450, 60), format)
- paragraph2.EndMarkedContent(doc.Pages(0))
- Dim figure1 As PdfStructureElement = article.AppendChildElement(PdfStandardStructTypes.Figure)
- 'Set Alternate text
- figure1.Alt = "replacement text1"
- figure1.BeginMarkedContent(doc.Pages(0), Nothing)
- Dim image As PdfImage = PdfImage.FromFile("logo.jpg")
- doc.Pages(0).Canvas.DrawImage(image, New PointF(40, 200), New SizeF(100, 100))
- figure1.EndMarkedContent(doc.Pages(0))
- Dim figure2 As PdfStructureElement = article.AppendChildElement(PdfStandardStructTypes.Figure)
- 'Set Alternate text
- figure2.Alt = "replacement text2"
- figure2.BeginMarkedContent(doc.Pages(0), Nothing)
- doc.Pages(0).Canvas.DrawRectangle(PdfPens.Black, New Rectangle(300, 200, 100, 100))
- figure2.EndMarkedContent(doc.Pages(0))
- '保存文档
- doc.SaveToFile("CreatePDFUAFile_result.pdf")
- System.Diagnostics.Process.Start("CreatePDFUAFile_result.pdf")
- End Sub
- End Class
- End Namespace
参考资料：
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