轉換為HTML時將圖片保存為光柵格式

Aspose.Pdf for .NET有一個非常強大的功能就是轉換PDF文件為DOC、DOCX、image、HTML以及其他各種格式。在PDF to HTML格式的轉換過程中，PDF文件中的圖片將被保存為SVG壓縮格式，但是你可能希望將它們保存為光柵格式 - PNG或者JPEG - 而不是縮小圖像尺寸。

// Source PDF file
Document doc = new Document("c:/input.pdf");
// Create HtmlSaveOption with tested feature
HtmlSaveOptions saveOptions = new HtmlSaveOptions();
saveOptions.FixedLayout = true;
saveOptions.SplitIntoPages = false;
saveOptions.RasterImagesSavingMode = HtmlSaveOptions.RasterImagesSavingModes.AsExternalPngFilesReferencedViaSvg;

string outFile = "c:/ResultantFile.pdf";
// Save the output in HTML format
doc.Save(outFile, saveOptions);

在PDF to HTML轉換時在單個頁面中分割CSS

HtmlSaveOptions類有一個屬性——SplitIntoPages，當生成輸出時它可以讓你在頁面中分割HTML。最近，一個用戶要求基于單個頁面分割CSS，而不是生成單獨的CSS文件。為了實現在個需求，ASPOSE推出一個HtmlSaveOptions類的新標簽——SplitCssIntoPages。當這個屬性設置為True時，轉換器將基于單個HTML頁面將CSS分割為parts/pages。請看如下的代碼段。

//1) Clean-up target folders
string htmlFile = Path.GetFullPath("c:/pdftest/ResultantFile_files/" + "resultant.html");
string imagesDir = Path.GetDirectoryName(htmlFile) + @"\35942_files";
string cssDir = Path.GetDirectoryName(htmlFile) + @"\35942_css_files";
if (Directory.Exists(imagesDir)) { Directory.Delete(imagesDir, true); };
if (Directory.Exists(cssDir)) { Directory.Delete(cssDir, true); };

//2) Create document for conversion
Document pdfDocument = new Document("c:/pdftest/antrag.pdf");

//3) Tune conversion options
HtmlSaveOptions options = new HtmlSaveOptions();
options.RasterImagesSavingMode = HtmlSaveOptions.RasterImagesSavingModes.AsPngImagesEmbeddedIntoSvg;//<- to get compatibility with previous behavior and therefore same result of tests
// Split HTML output into pages
options.SplitIntoPages = true;
// Split CSS into pages
options.SplitCssIntoPages = true;
options.CustomCssSavingStrategy = new HtmlSaveOptions.CssSavingStrategy(Strategy_4_CSS_MULTIPAGE_SAVING_RIGHT_WAY);
options.CustomStrategyOfCssUrlCreation = new HtmlSaveOptions.CssUrlMakingStrategy(Strategy_5_CSS_MAKING_CUSTOM_URL_FOR_MULTIPAGING);
//3) Convert
pdfDocument.Save(htmlFile, options);

private static void Strategy_4_CSS_MULTIPAGE_SAVING_RIGHT_WAY(HtmlSaveOptions.CssSavingInfo partSavingInfo)
{
    string cssOutFolder = @"c:\pdftest\ResultantFile_files\";
    if (!Directory.Exists(cssOutFolder))
    {
        Directory.CreateDirectory(cssOutFolder);
    }

    string outPath = cssOutFolder + "style_xyz_page" + partSavingInfo.HtmlPageNumber.ToString() + ".css";
    System.IO.BinaryReader reader = new BinaryReader(partSavingInfo.ContentStream);
    System.IO.File.WriteAllBytes(outPath, reader.ReadBytes((int)partSavingInfo.ContentStream.Length));
}
private static string Strategy_5_CSS_MAKING_CUSTOM_URL_FOR_MULTIPAGING(HtmlSaveOptions.CssUrlRequestInfo requestInfo)
{
    return "/document-viewer/GetCss?cssId=4544554445_page{0}";
}

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