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PDF是当今最流行的文档格式之一，各种应用程序将其用作最终输出。由于支持多种数据类型和可移植性，因此它是创建和共享内容的首选格式。作为对开发文档管理应用程序感兴趣的.NET应用程序开发人员，可能希望嵌入处理功能，以读取PDF文档并将其转换为其他文件格式，例如HTML。

Aspose.PDF for .NET是一种高级PDF处理和解析API，用于在跨平台应用程序中执行文档管理和操作任务。API可以轻松用于生成，修改，转换，渲染，保护和打印PDF文档，而无需使用Adobe Acrobat。

在本文中，我们将探索并演示Aspose.PDF for .NET API的强大转换功能，将PDF转换为HTML后，如何嵌入所有资源（字体、图像、CSS等）到单个HTML中。

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PDF转HTML-嵌入所有资源的单个HTML

PDF到HTML的转换是Aspose.PDF for Java的最强大功能之一，因为它允许生成高保真HTML文档。转换期间，PDF文件中的所有资源（字体，图像和CSS）都保存在创建输出HTML的同一目录中的单独文件夹中。但是，用户需要新的功能，可将PDF文件转换为HTML格式并生成嵌入了所有资源的单个HTML文件。此功能的实现符合数据URI方案。为此，将值EmbedAllIntoHtml添加到HtmlSaveOptions.PartsEmbeddingModes枚举中。以下代码段显示了如何使用它。

// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdf_DocumentConversion_PDFToHTMLFormat();

// Load source PDF file
Document doc = new Document(dataDir + "input.pdf");
// Instantiate HTML Save options object
HtmlSaveOptions newOptions = new HtmlSaveOptions();

// Enable option to embed all resources inside the HTML
newOptions.PartsEmbeddingMode = HtmlSaveOptions.PartsEmbeddingModes.EmbedAllIntoHtml;

// This is just optimization for IE and can be omitted 
newOptions.LettersPositioningMethod = HtmlSaveOptions.LettersPositioningMethods.UseEmUnitsAndCompensationOfRoundingErrorsInCss;
newOptions.RasterImagesSavingMode = HtmlSaveOptions.RasterImagesSavingModes.AsEmbeddedPartsOfPngPageBackground;
newOptions.FontSavingMode = HtmlSaveOptions.FontSavingModes.SaveInAllFormats;
// Output file path 
string outHtmlFile = "SingleHTML_out.html";
doc.Save(outHtmlFile, newOptions);

// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdf_DocumentConversion_PDFToHTMLFormat();

// Select desirable page size
float newPageWidth = 400f;
float newPageHeight = 400f;

// Tune PdfPageEditor class 
Aspose.Pdf.Facades.PdfPageEditor pdfEditor = new Aspose.Pdf.Facades.PdfPageEditor();
// Bind source PDF file
pdfEditor.BindPdf(dataDir + "input.pdf");
// Set the page dimensions 
pdfEditor.PageSize = new Aspose.Pdf.PageSize(newPageWidth, newPageHeight);
// Set vertical alignment for page as center aligned
pdfEditor.VerticalAlignmentType = Aspose.Pdf.VerticalAlignment.Center;
// Set Horizontal alignment for page as center aligned
pdfEditor.HorizontalAlignment = Aspose.Pdf.HorizontalAlignment.Center;

// This scales page content to fit width,
// Comment it out or set Zoom to 1.0F if You don't want to scale
// Content and only want to change page's size (i.e. crop it)
float zoom = Math.Min((float)newPageWidth / (float)pdfEditor.Document.Pages[1].Rect.Width,
                    (float)newPageHeight / (float)pdfEditor.Document.Pages[1].Rect.Height);
pdfEditor.Zoom = zoom;// (float)595;

// Create stream object to hold file with updated dimensions
MemoryStream output = new MemoryStream();
// Save file to stream object
pdfEditor.Save(output);

// Then reload scaled document and save it to HTML
Document exportDoc = new Document(output);
HtmlSaveOptions htmlOptions = new HtmlSaveOptions();
// This code shows page boreder in result - sometimes it comes in handy to see borders
SaveOptions.BorderPartStyle borderStyle = new SaveOptions.BorderPartStyle();
borderStyle.LineType = SaveOptions.HtmlBorderLineType.Dotted;
borderStyle.Color = System.Drawing.Color.Gray;
htmlOptions.PageBorderIfAny = new SaveOptions.BorderInfo(borderStyle);

// Conversion to HTML itself
exportDoc.Save(dataDir + "SetOutputFileDimensions_out.html", htmlOptions);
// Close the stream object
output.Close();