2021年新功能

Aspose.PDF 21.11中的新功能

允许在密码中使用非拉丁字符

private static void EncriptPdfNonlatinPassCharacters()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_SecuritySignatures();

    using (var fileSecurity = new Aspose.Pdf.Facades.PdfFileSecurity())
    {
        // Bind PDF document
        fileSecurity.BindPdf(dataDir + "input.pdf");
        // Encrypt file using 256-bit encryption
        bool isSuccessful = fileSecurity.EncryptFile("æøå", "æøå", Aspose.Pdf.Facades.DocumentPrivilege.Print,
            Aspose.Pdf.Facades.KeySize.x256, Aspose.Pdf.Facades.Algorithm.AES);
        Console.WriteLine(isSuccessful);
        // Save PDF document
        fileSecurity.Save(dataDir + "PdfNonlatinPassEncrypted_out.pdf");
    }
}

Aspose.PDF 21.10中的新功能

如何检测隐藏文本？

请使用 TextState.Invisible 获取有关文本在渲染模式设置之外的不可见性的信息。

我们使用以下代码进行测试：

private static void DisplayTextInvisibility()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_Text();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "PdfWithHiddenText.pdf"))
    {
        Console.WriteLine(document.FileName);

        // Use TextFragmentAbsorber with no parameters to get all text
        var absorber = new Aspose.Pdf.Text.TextFragmentAbsorber();
        absorber.Visit(document.Pages[1]);
        var textFragmentCollection = absorber.TextFragments;

        // Iterate through text fragments to find hidden text
        for (int i = 1; i <= textFragmentCollection.Count; i++)
        {
            var fragment = textFragmentCollection[i];
            Console.WriteLine("Fragment {0} at {1}", i, fragment.Rectangle.ToString());
            Console.WriteLine("Text: {0}", fragment.Text);
            Console.WriteLine("RenderingMode: {0}", fragment.TextState.RenderingMode.ToString());
            Console.WriteLine("Invisibility: {0}", fragment.TextState.Invisible);
            Console.WriteLine("---");
        }
    }
}

如何获取PDF文档中图层的数量信息？

private static void GetPdfLayers()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_Layers();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "PdfWithLayers.pdf"))
    {
        // Get layers from the first page
        var layers = document.Pages[1].Layers;
        // Save each layer to the output path
        foreach (var layer in layers)
        {
            Console.WriteLine("Document {0} contains a layer named: {1} ", document.FileName, layer.Name);
        }
    }
}

Aspose.PDF 21.9中的新功能

自定义签名外观的背景颜色和签名区域标签的字体颜色，使用Aspose.PDF for .NET。

private static void SignPdfWithCustomColorsInAppearance(string pfxFilePath, string password)
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_SecuritySignatures();

    // Instantiate PdfFileSignature object
    using (var pdfFileSignature = new Aspose.Pdf.Facades.PdfFileSignature())
    {
        // Bind PDF document
        pdfFileSignature.BindPdf(dataDir + "DigitallySign.pdf");
        var rect = new System.Drawing.Rectangle(310, 45, 200, 50);
        // Create PKCS#7 object for sign
        var pkcs = new Aspose.Pdf.Forms.PKCS7(pfxFilePath, password);

        // Set signature custom appearance
        pkcs.CustomAppearance = new Aspose.Pdf.Forms.SignatureCustomAppearance()
        {
            // Set colors
            ForegroundColor = Aspose.Pdf.Color.DarkGreen,
            BackgroundColor = Aspose.Pdf.Color.LightSeaGreen,
        };
        // Sign PDF file
        pdfFileSignature.Sign(1, true, rect, pkcs);
        // Save PDF document
        pdfFileSignature.Save(dataDir + "SignPdfWithCustomColorsInAppearance_out.pdf");
    }
}

Aspose.PDF 21.8中的新功能

如何更改数字签名中的文本颜色？

在21.8版本中，ForegroundColor属性允许更改数字签名中的文本颜色。

private static void SignPdfWithForegroundColorInAppearance(string pfxFilePath, string password)
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_SecuritySignatures();

    // Instantiate PdfFileSignature object
    using (var pdfSign = new Aspose.Pdf.Facades.PdfFileSignature())
    {
        // Bind PDF document
        pdfSign.BindPdf(dataDir + "DigitallySign.pdf");
        var rect = new System.Drawing.Rectangle(310, 45, 200, 50);
        // Create PKCS#7 object for sign
        var pkcs = new Aspose.Pdf.Forms.PKCS7(pfxFilePath, password);

        // Set signature custom appearance
        pkcs.CustomAppearance = new Aspose.Pdf.Forms.SignatureCustomAppearance()
        {
            // Set text color
            ForegroundColor = Aspose.Pdf.Color.Green
        };
        // Sign PDF file
        pdfSign.Sign(1, true, rect, pkcs);
        // Save PDF document
        pdfSign.Save(dataDir + "SignPdfWithForegroundInAppearance_out.pdf");
    }
}

Aspose.PDF 21.7中的新功能

基于XML和XLS的PDF创建，带参数

要添加XSL参数，我们需要创建自己的XsltArgumentList并将其设置为XslFoLoadOptions中的一个属性。以下代码片段展示了如何使用此类与上述示例文件。

private static void ConvertXslfoToPdfWithArgumentList()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_DocumentConversion();

    // Create convert options
    var options = new Aspose.Pdf.XslFoLoadOptions(dataDir + "XSLFOToPdfInput.xslt");

    // Example of using XsltArgumentList
    options.XsltArgumentList = new XsltArgumentList();
    options.XsltArgumentList.AddParam("isBoldName", "", "yes");

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "XSLFOToPdfInput.xml", options))
    {
        // Save PDF document
        document.Save(dataDir + "XslfoToPdfWithArgumentList_out.pdf");
    }
}

Aspose.PDF 21.6中的新功能

使用Aspose.PDF for .NET，您可以使用ImagePlacementAbsorber从文档中隐藏图像：

private static void HideImageInPdf()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_Images();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "ImagePlacement.pdf"))
    {
        // Create ImagePlacementAbsorber instance
        var absorber = new Aspose.Pdf.ImagePlacementAbsorber();
        // Load the images of the first page
        document.Pages[1].Accept(absorber);

        // Iterate through each image placement on the first page
        foreach (var imagePlacement in absorber.ImagePlacements)
        {
            // Hide image
            imagePlacement.Hide();
        }

        // Save PDF document
        document.Save(dataDir + "HideImageInPdf_out.pdf");
    }
}

Aspose.PDF 21.5中的新功能

如何从PDF中的描述/资源中提取字体全名？

您可以通过Font类的BaseFont属性获取带前缀的完整字体。

private static void DisplayFontFullNames()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "BreakfastMenu.pdf"))
    {
        // Get document fonts
        var fonts = document.FontUtilities.GetAllFonts();

        // Iterate through the fonts
        foreach (var font in fonts)
        {
            // Show font names
            Console.WriteLine($"font name : {font.FontName} BaseFont name : {font.BaseFont}");
        }
    }
}

Aspose.PDF 21.4中的新功能

添加合并图像的API

Aspose.PDF 21.4允许您合并图像。请遵循以下代码片段：

private static void MergeAsJpeg()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_Images();

    List<Stream> inputImagesStreams = new List<Stream>();
    using (FileStream firstImageStream = new FileStream(dataDir + "aspose.jpg", FileMode.Open))
    {
        inputImagesStreams.Add(firstImageStream);
        using (FileStream secondImageStream = new FileStream(dataDir + "aspose-logo.jpg", FileMode.Open))
        {
            inputImagesStreams.Add(secondImageStream);

            // Invoke PdfConverter.MergeImages to perform merge
            using (Stream inputStream = Aspose.Pdf.Facades.PdfConverter.MergeImages(inputImagesStreams,
                  Aspose.Pdf.Drawing.ImageFormat.Jpeg, Aspose.Pdf.Facades.ImageMergeMode.Vertical, 1, 1))
            {
                using (FileStream outputStream = new FileStream(dataDir + "Merge_out.jpg", FileMode.Create))
                {
                    byte[] buffer = new byte[32768];
                    int read;
                    while ((read = inputStream.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        outputStream.Write(buffer, 0, read);
                    }
                }
            }
        }
    }
}

此外，您可以将图像合并为Tiff格式：

private static void MergeAsTiff()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_Images();

    List<Stream> inputImagesStreams = new List<Stream>();
    using (FileStream firstImageStream = new FileStream(dataDir + "aspose.jpg", FileMode.Open))
    {
        inputImagesStreams.Add(firstImageStream);
        using (FileStream secondImageStream = new FileStream(dataDir + "aspose-logo.jpg", FileMode.Open))
        {
            inputImagesStreams.Add(secondImageStream);

            // Invoke PdfConverter.MergeImagesAsTiff to perform merge
            using (Stream inputStream = Aspose.Pdf.Facades.PdfConverter.MergeImagesAsTiff(inputImagesStreams))
            {
                using (FileStream outputStream = new FileStream(dataDir + "Merge_out.tiff", FileMode.Create))
                {
                    byte[] buffer = new byte[32768];
                    int read;
                    while ((read = inputStream.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        outputStream.Write(buffer, 0, read);
                    }
                }
            }
        }
    }
}

Aspose.PDF 21.3中的新功能

公共暴露属性以检测Azure信息保护

使用以下代码片段，您应该能够访问受Azure信息保护保护的PDF文件的加密有效负载：

private static void AzureInformationProtection()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_Attachments();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "GetAlltheAttachments.pdf"))
    {
        if (document.EmbeddedFiles[1].AFRelationship == Aspose.Pdf.AFRelationship.EncryptedPayload)
        {
            if (document.EmbeddedFiles[1].EncryptedPayload != null)
            {
                // document.EmbeddedFiles[1].EncryptedPayload.Type == "EncryptedPayload"
                // document.EmbeddedFiles[1].EncryptedPayload.Subtype == "MicrosoftIRMServices"
                // document.EmbeddedFiles[1].EncryptedPayload.Version == "2"
            }
        }
    }
}

Aspose.PDF 21.1中的新功能

添加支持以检索TextFragment的背景颜色

在此版本的Aspose.PDF中，检索背景颜色的功能变得可用。您需要在TextFragmentAbsorber对象的选项中指定searchOptions.SearchForTextRelatedGraphics = true;。

请考虑以下代码：

private static void DisplayPdfTextBackgroundColor()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_Text();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "PdfWithTextBackgroundColor.pdf"))
    {
        // Use TextFragmentAbsorber with no parameters to get all text
        var textFragmentAbsorber = new Aspose.Pdf.Text.TextFragmentAbsorber();

        var searchOptions = new Aspose.Pdf.Text.TextSearchOptions(false);
        // Setting this option to 'true' is necessary 
        searchOptions.SearchForTextRelatedGraphics = true;
        textFragmentAbsorber.TextSearchOptions = searchOptions;

        // Accept the absorber for all the pages
        document.Pages.Accept(textFragmentAbsorber);
        
        // Loop through the fragments
        foreach (var textFragment in textFragmentAbsorber.TextFragments)
        {
            Console.WriteLine("Text: '{0}'", textFragment.Text);
            Console.WriteLine("BackgroundColor: '{0}'", textFragment.TextState.BackgroundColor);
            Console.WriteLine("ForegroundColor: '{0}'", textFragment.TextState.ForegroundColor);
            Console.WriteLine("Segment BackgroundColor: '{0}'", textFragment.Segments[1].TextState.BackgroundColor);
        }
    }
}

转换为HTML后，字体完全嵌入输出中

此外，在Aspose.PDF 21.1中，将PDF转换为HTML后，嵌入的字体在输出的HTML文档中可用。这是通过新的布尔保存选项HtmlSaveParameter.SaveFullFont实现的。

以下是代码片段：

private static void PdfToHtmlWithFullFont()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_DocumentConversion();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "PDFToHTML.pdf"))
    {
        // Instantiate HTML SaveOptions object
        var options = new Aspose.Pdf.HtmlSaveOptions
        {
            RasterImagesSavingMode = Aspose.Pdf.HtmlSaveOptions.RasterImagesSavingModes.AsEmbeddedPartsOfPngPageBackground,
            PartsEmbeddingMode = Aspose.Pdf.HtmlSaveOptions.PartsEmbeddingModes.EmbedAllIntoHtml,
            LettersPositioningMethod = Aspose.Pdf.HtmlSaveOptions.LettersPositioningMethods.UseEmUnitsAndCompensationOfRoundingErrorsInCss,
            FontSavingMode = Aspose.Pdf.HtmlSaveOptions.FontSavingModes.AlwaysSaveAsTTF,
            SaveTransparentTexts = true,
            // New option
            SaveFullFont = true
        };
        // Save HTML document
        document.Save(dataDir + "PdfToHtmlWithFullFont_out.html", options);
    }
}