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Document document = new Document(); PdfWriter writer = PdfWriter.getInstance( document, new FileOutputStream(filename)); writer.setPDFXConformance(PdfWriter.PDFX1A2001); document.open(); Font font = FontFactory.getFont(FONT, BaseFont.CP1252, BaseFont.EMBEDDED, Font.UNDEFINED, Font.UNDEFINED, new CMYKColor(255, 255, 0, 0)); document.add(new Paragraph("Hello World", font)); document.close();

Enhancing the MsgClient To incorporate the ability to send and receive datagrams from our MsgClient, the following changes will be needed, starting with the user interface, then adding the datagram option to the menu as the third option:

As soon as you introduce functionality that isn t allowed in the PDF/X specification you ve chosen, iText will throw an exception explaining what went wrong. For instance, try making these changes:

Replace BaseFont.EMBEDDED B with BaseFont.NOT_EMBEDDED. Try executing the example, and it will throw an exception saying, All the fonts must be embedded. This one isn t: ArialMT. Replace the CMYKColor C used for the font color by an instance of the BaseColor class. iText will throw the following error: Colorspace RGB is not allowed.

private static final String[] choices = { "1 HTTP Example", "2 Socket Message", "3 Datagram Message" };

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The exceptions help you discover what is missing. iText has similar functionality for PDF/A, although iText won t always throw an exception if you forget some of the requirements. You need a PDF validator after creating a PDF/A file with iText to see if you ve met all the conditions and restrictions.

Next, we add the necessary lines of code to the handleOK method to trigger a datagram message to be sent.

The PDF/A specification is also known as ISO 19005-1:2005: Document Management Electronic Document File Format for Long-Term Preservation Part 1: Use of PDF 1.4 (PDF/A-1). The standard was approved in September 2005. The initiative for PDF/A was started by the Association for Information and Image Management (AIIM) and the Association for Suppliers of Printing, Publishing, and Converting Technology (NPES). There are many electronic formats and technologies to choose from for archiving electronic data. The proprietary nature of many of these formats is one of the biggest disadvantages. There s no guarantee that a Word document created with the latest Microsoft Word version will open up in the newest version ten years from now. And even if you re able to open it, you can t expect it to look like it looked in the version of Word that was used to create it. As opposed to most word-processing formats, PDF represents not only the data contained in the document, but also the exact form the document takes. The file can be viewed without the originating application. Adobe also made sure that all the revisions of the PDF specification are backward compatible, so no matter the version number, the PDF will always look the same even on newer PDF viewers. Even before PDF was published as an ISO standard, the PDF version of the specification was available for free. Anyone, at any time, using any hardware or software, can create programs to access PDF documents. This makes PDF (ISO-32000) an interesting candidate as a format for archiving. PDF/A goes a step further. It s a subset of PDF-1.4, and like PDF/X, PDF/A imposes requirements and constraints.

private void handleOK(int idx){ display.setCurrent(outputForm); switch (idx) { case 0: getHttpMessage(); break; case 1: socketMessage(); break; case 2: datagramMessage(); break; } }

In order to meet level-B conformance, all fonts must be embedded, encryption isn t allowed, audio and video content are forbidden, JavaScript and executable file launches are not permitted, and so forth. Each PDF/A document must contain metadata in the form of an XMP stream. Here is how to create a level-B PDF/A document using iText.

Document document = new Document(); PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(filename));

The Advanced button opens the Advanced Layout dialog box, as shown in Figure 3-16. On the Text Wrapping tab, you can specify the distance between the picture and text. You can also specify text wrapping for specific sides of the picture.

To handle the functionality of sending and receiving datagrams, three more methods are introduced to the MsgClient: datagramMessage(), receiveDatagram() and sendDatagram(). The datagramMessage() method is called to handle requests from the menu to send and receive a message. The latter two methods handle the receiving and sending of specific functionality. The code for sending and receiving datagrams is shown in listing 13.6.

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