C#/VB.NET 创建PDF/UA文件

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摘要

VB.NET  —END— 相关阅读推荐:C# 创建标签PDF文件 


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。

可在Visual Studio 中通过NuGet搜索“Spire.PDF”安装dll到程序中;

或者下载(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");         }     } }

VB.NET

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

C#/VB.NET 创建PDF/UA文件

 

参考资料:

 

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