PDF是當(dāng)今最流行的文檔格式之一，各種應(yīng)用程序?qū)⑵溆米髯?終輸出。由于支持多種數(shù)據(jù)類型和可移植性，因此它是創(chuàng)建和共享內(nèi)容的首選格式。作為對(duì)開(kāi)發(fā)文檔管理應(yīng)用程序感興趣的.NET應(yīng)用程序開(kāi)發(fā)人員，可能希望嵌入處理功能，以讀取PDF文檔并將其轉(zhuǎn)換為其他文件格式，例如HTML。

Aspose.PDF for .NET是一種高級(jí)PDF處理和解析API，用于在跨平臺(tái)應(yīng)用程序中執(zhí)行文檔管理和操作任務(wù)。API可以輕松用于生成，修改，轉(zhuǎn)換，渲染，保護(hù)和打印PDF文檔，而無(wú)需使用Adobe Acrobat。

在本文中，我們將探索并演示Aspose.PDF for .NET API的強(qiáng)大轉(zhuǎn)換功能，將PDF轉(zhuǎn)換為HTML后，如何嵌入所有資源（字體、圖像、CSS等）到單個(gè)HTML中。

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PDF轉(zhuǎn)HTML-嵌入所有資源的單個(gè)HTML

PDF到HTML的轉(zhuǎn)換是Aspose.PDF for Java的最強(qiáng)大功能之一，因?yàn)樗试S生成高保真HTML文檔。轉(zhuǎn)換期間，PDF文件中的所有資源（字體，圖像和CSS）都保存在創(chuàng)建輸出HTML的同一目錄中的單獨(dú)文件夾中。但是，用戶需要新的功能，可將PDF文件轉(zhuǎn)換為HTML格式并生成嵌入了所有資源的單個(gè)HTML文件。此功能的實(shí)現(xiàn)符合數(shù)據(jù)URI方案。為此，將值EmbedAllIntoHtml添加到HtmlSaveOptions.PartsEmbeddingModes枚舉中。以下代碼段顯示了如何使用它。

// 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();