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When creating an AcroForm using iText, you implicitly create PdfDictionary, PdfArray, and other PdfObject instances. XFA forms are totally different; they aren t defined using PDF objects. XFA forms are described in an XML stream that s embedded in the PDF file. You can extract this XML into a separate file.

Listing 8.20 XfaMovie.java (continued)

Choosing the second option sends a message from the MsgClient to the MsgListener. The MsgListener then returns a response to the MsgClient-. This is shown in figure 13.7. The client initially displays a menu as well, which is shown in figure 13.7. Selecting the second option Socket Message triggers the client code to send a message to the server. The server responds with a message. The messages are displayed in the output forms of each emulator. The output from the MsgListener is shown in figure 13.8.

public void readXfa(String src, String dest) throws IOException, ParserConfigurationException, SAXException, TransformerFactoryConfigurationError, TransformerException { FileOutputStream os = new FileOutputStream(dest); Creates XfaForm PdfReader reader = new PdfReader(src); instance XfaForm xfa = new XfaForm(reader); Document doc = xfa.getDomDocument(); Gets org.w3c.dom.Document instance Transformer tf = TransformerFactory.newInstance().newTransformer(); Transforms tf.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); Document to XML file tf.setOutputProperty(OutputKeys.INDENT, "yes"); tf.transform(new DOMSource(doc), new StreamResult(os)); reader.close(); }

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Figure 13.8 MsgListener receiving a message over a socket connection. The MsgListener monitors a specified port for socket activity. When the MsgClient initiates a connection, the MsgListener establishes the other half of the connection and gets ready to receive data. When the MsgClient transmits data, the MsgListener responds appropriately.

Note that the Document in this code snippet isn t a com.itextpdf.text.Document object, but an instance of org.w3c.dom.Document. Transforming this Document into an XML file is done using different classes from the javax.xml.transform package. This is a shortened version of the resulting file.

Additionally, we placed some System.out.println() statements into our code to monitor progress from the command line. These results are shown in figure 13.9.

< xml version="1.0" encoding="UTF-8" standalone="no" > <xdp:xdp> <config>...</config> <template>...</template> <xfa:datasets> <xfa:data> <movies> <movie duration="" imdb="" year=""> <title/> </movie> </movies> </xfa:data> <dd:dataDescription> <movies> <movie dd:maxOccur="-1" dd:reqAttrs="duration imdb year" duration="" imdb="" year=""> <title/> <original dd:minOccur="0" dd:nullType="exclude"/> </movie> </movies> </dd:dataDescription> </xfa:datasets> </xdp:xdp>

When you find your image, select it and click Insert. The image will appear at the current cursor position. It is also possible to insert a picture by copying it from a different program, such as a photo editing program. Then select the place in your document where you want to insert the image and use the Ctrl+V keyboard shortcut to paste the picture into the document.

If you want to understand the full XML file that was extracted, you ll need to consult the XFA specification for more info about the elements that can be found inside an XFA form:

Datagrams are designed for sending packets of data over a network Datagrams work much differently than sockets in that a hard connection is not established between the two systems In the case of sockets, if a client tries to connect to a system that does not support sockets or is not listening for socket connections, an exception is thrown Datagrams, on the other hand, allow data to be sent over a connection regardless of whether the listener on the other end is capable of handling datagrams or even exists In all cases, when sending data using Datagrams, the transmission is assumed to be successful.

config, localeSet, xmp, ... The XFA XML can contain application-defined information and XFA grammar: configuration information, localization info, metadata, information about web connections, and so on. Except for the config tag, I ve omitted these tags, because they re outside the scope of this book. template This is where the appearance and behavior of the form is defined. datasets This contains all the sets of data used with the form. data Contains the data held by fields in the form. dataDescription Defines the schema for the data.

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