如何使用带有C#的itext7将u3d添加到现有的pdf中

Question

我使用iText7 (C#)来创建pdf。我需要添加一个u3d图片到现有的pdf。我可以找到示例(http://developers.itextpdf.com/examples/itext-action-second-edition/chapter-16#619-pdf3d.java)，但它是java示例。谁能帮我举一个关于.net C#的例子？

Answer 1

链接的示例是针对iText5的，而不是针对iText7的。在iText7中，此示例如下所示

  public static final String DEST = "./target/test/resources/book/part4/chapter16/Listing_16_16_Pdf3D.pdf";
    public static String RESOURCE = "./src/test/resources/img/teapot.u3d";

    public static void main(String args[]) throws Exception {
        new Listing_16_16_Pdf3D().manipulatePdf(DEST);
    }

    public void manipulatePdf(String dest) throws Exception {
        PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));

        Document doc = new Document(pdfDoc);
        Rectangle rect = new Rectangle(100, 400, 400, 400);

        PdfStream stream3D = new PdfStream(pdfDoc, new FileInputStream(RESOURCE));
        stream3D.put(PdfName.Type, new PdfName("3D"));
        stream3D.put(PdfName.Subtype, new PdfName("U3D"));
        stream3D.setCompressionLevel(CompressionConstants.DEFAULT_COMPRESSION);
        stream3D.flush();

        PdfDictionary dict3D = new PdfDictionary();
        dict3D.put(PdfName.Type, new PdfName("3DView"));
        dict3D.put(new PdfName("XN"), new PdfString("Default"));
        dict3D.put(new PdfName("IN"), new PdfString("Unnamed"));
        dict3D.put(new PdfName("MS"), PdfName.M);
        dict3D.put(new PdfName("C2W"),
                new PdfArray(new float[]{1, 0, 0, 0, 0, -1, 0, 1, 0, 3, -235, 28}));
        dict3D.put(PdfName.CO, new PdfNumber(235));

        Pdf3DAnnotation annot = new Pdf3DAnnotation(rect, stream3D);
        annot.setContents(new PdfString("3D Model"));
        annot.setDefaultInitialView(dict3D);
        pdfDoc.addNewPage().addAnnotation(annot);
        doc.close();
    }

或者，如果你想在C#中运行它(虽然没有在本地运行，但visual studio不会抱怨语法问题)。

    public void manipulatePdf(String dest) {
        PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));

        Document doc = new Document(pdfDoc);
        Rectangle rect = new Rectangle(100, 400, 400, 400);

        PdfStream stream3D = new PdfStream(pdfDoc, new FileInputStream(RESOURCE));
        stream3D.Put(PdfName.Type, new PdfName("3D"));
        stream3D.Put(PdfName.Subtype, new PdfName("U3D"));
        stream3D.SetCompressionLevel(CompressionConstants.DEFAULT_COMPRESSION);
        stream3D.Flush();

        PdfDictionary dict3D = new PdfDictionary();
        dict3D.Put(PdfName.Type, new PdfName("3DView"));
        dict3D.Put(new PdfName("XN"), new PdfString("Default"));
        dict3D.Put(new PdfName("IN"), new PdfString("Unnamed"));
        dict3D.Put(new PdfName("MS"), PdfName.M);
        dict3D.Put(new PdfName("C2W"),
                new PdfArray(new float[] { 1, 0, 0, 0, 0, -1, 0, 1, 0, 3, -235, 28 }));
        dict3D.Put(PdfName.CO, new PdfNumber(235));

        Pdf3DAnnotation annot = new Pdf3DAnnotation(rect, stream3D);
        annot.SetContents(new PdfString("3D Model"));
        annot.SetDefaultInitialView(dict3D);
        pdfDoc.AddNewPage().AddAnnotation(annot);
        doc.Close();
    }

Answer 2

.net的iText代码库被设计成(几乎) java代码库的镜像。

除了代码约定(比如方法名以大写字母开头)，您应该能够在.net中使用java代码。

这也解释了为什么我们通常不发布.net的代码。我建议您只需复制/粘贴java代码，更改方法名称以适应代码约定，然后尝试编译它。

如果有什么不同的话，它会给你一个代码样本，你可以在这里张贴，让你的帖子更明智一些。

Answer 3

这是使用c#将u3d文件打印成pdf的工作代码

FileStream stream = new FileStream("E:\\Testingfolder\\u3dpdf\\DoctoPdf.pdf", FileMode.Open, FileAccess.Read);
        String RESOURCE;
        RESOURCE = "E:\\Testingfolder\\u3dpdf\\Testu3d.u3d";

        iTextSharp.text.Rectangle rect;
        using (iTextSharp.text.Document document = new iTextSharp.text.Document())
        {
            PdfWriter pdfwriter = PdfWriter.GetInstance(document, stream);

            // step 3
            document.Open();
            // step 4
            rect = new iTextSharp.text.Rectangle(100, 400, 500, 800);
            rect.Border = iTextSharp.text.Rectangle.BOX;
            rect.BorderWidth = 0.5f;
            rect.BorderColor = new BaseColor(0xFF, 0x00, 0x00);
            document.Add(rect);
            document.SetMargins(129,259,647,1416);
            PdfIndirectObject streamObject = null;
            using (FileStream fs =
                new FileStream(RESOURCE, FileMode.Open, FileAccess.Read))
            {
                PdfStream stream3D = new PdfStream(fs, pdfwriter);

                stream3D.Put(PdfName.TYPE, new PdfName("3D"));
                stream3D.Put(PdfName.SUBTYPE, new PdfName("U3D"));
                stream3D.FlateCompress();
                streamObject = pdfwriter.AddToBody(stream3D);
                stream3D.WriteLength();
            }
            PdfDictionary dict3D = new PdfDictionary();
            dict3D.Put(PdfName.TYPE, new PdfName("3DView"));
            dict3D.Put(new PdfName("XN"), new PdfString("Default"));
            dict3D.Put(new PdfName("IN"), new PdfString("Unnamed"));
            dict3D.Put(new PdfName("MS"), PdfName.M);
            dict3D.Put(new PdfName("C2W"),
                    new PdfArray(new float[] { 1, 0, 0, 0, 0, -1, 0, 1, 0, 3, -235, 28 }));
            dict3D.Put(PdfName.CO, new PdfNumber(235));

            PdfIndirectObject dictObject = pdfwriter.AddToBody(dict3D);


            PdfAnnotation annot = new PdfAnnotation(pdfwriter, rect);
            annot.Put(PdfName.CONTENTS, new PdfString("3D Model"));
            annot.Put(PdfName.SUBTYPE, new PdfName("3D"));
            annot.Put(PdfName.TYPE, PdfName.ANNOT);
            annot.Put(new PdfName("3DD"), streamObject.IndirectReference);
            annot.Put(new PdfName("3DV"), dictObject.IndirectReference);
            PdfAppearance ap = pdfwriter.DirectContent.CreateAppearance(
                rect.Width, rect.Height
            );
            annot.SetAppearance(PdfAnnotation.APPEARANCE_NORMAL, ap);
            annot.SetPage();

            pdfwriter.AddAnnotation(annot);

        }