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You have to add two extra parameters to the createSignature() method if you want to add a second signature. One parameter can be used to store the resulting PDF as a temporary file. If you pass a File object that s a directory, a temporary file will be created there; if it s a file, it will be used directly. The file will be deleted on exit unless the os output stream is null. In that case, the document can be retrieved directly from the temporary file. This is a way to keep the memory use low. In this example, you re signing a simple Hello World file. You don t need a temporary file; the signing will be done in memory. The fifth parameter of createSignature() indicates whether or not the file has to be manipulated in append mode. Working in append mode means that the original file will be kept intact; the new content will be appended after the %EOF marker.

protected void destroyApp(boolean unconditional) throws MIDletStateChangeException { System.out.println("Destroy App."); if (socketListener != null){ socketListener.shutdown(); } } public void commandAction(Command cmd, Displayable activeDisplay) { if (cmd == exitCmd) { handleExit(); } else if ((activeDisplay == menu) && (cmd == okCmd)) { handleOK(((List)activeDisplay).getSelectedIndex()); return; } display.setCurrent(menu); } private void handleExit(){ try { System.out.println("exit."); destroyApp(true); notifyDestroyed(); } catch (MIDletStateChangeException x){ x.printStackTrace(); } } private void handleOK(int idx){ display.setCurrent(outputForm); switch (idx) { case 0: socketListener(); break; case 1: datagramListener(); break; } }

You can also use append mode if you want the file to keep the complete history of the changes made to the document. We ll look at the implications of using append mode outside the context of digital signatures in chapter 13.

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Tables will play an important role in your business plan. Use tables to organize data in balance sheets, sales projections, and other financials. The easiest way for you to create a table in Word is to use the Insert Table button on the Standard toolbar. Position the cursor where you would like the table. Then click the Insert Table button. Use the drop-down grid to select the number of rows and columns for the table, as shown in Figure 2-22. When you release the mouse, Word inserts the table at the appropriate location in your document.

Using append mode is mandatory if you want to add content to a document that has been signed. If you set the append value to false, the original signature will be invalidated, as shown in figure 12.8. When a document is signed multiple times, you get a PDF file with multiple revisions (see the signature panel in figures 12.6 and 12.7). For one revision, the signature name is first ; for the other it s second . In figure 12.6, you can see a link

private void socketListener(){ if (socketListener == null){ socketListener = new SocketListener(outputForm); socketListener.start(); } } private void datagramListener(){ }

in the signature panel saying Click to view this version. This allows you to manually retrieve the original files for each signature. This listing shows how to extract such a revision programmatically.

Creating the service class The next step is to implement the SocketListener service class. This is where all the socket listener behavior will be encapsulated. Listening for messages is slightly different than sending messages because the listener can never be sure of when or if the client will attempt to connect. As a result, if we simply listened for the connection and the data to be sent on the same thread that the application is running on, our application would appear to hang until the connection was terminated. For this reason, it is best to implement the connection listening part of the application on a separate thread. This allows the application to continue functioning while waiting and receiving messages. By handling messages on a separate thread, the data received by the message handler can be displayed immediately as well, rather than having to wait until the connection finished transmitting data. This is especially important if two devices require that the users provide input during the data exchange. If a separate thread is not used, a connection would need to be established each time the user entered a piece of data, since the connection and the data entry must share the same thread. The SocketListener class extends Thread to provide the ability to create and run the listener on its own thread.

public void extractFirstRevision() throws IOException { PdfReader reader = new PdfReader(SIGNED2); AcroFields af = reader.getAcroFields(); FileOutputStream os = new FileOutputStream(REVISION); byte bb[] = new byte[8192]; InputStream ip = af.extractRevision("first"); int n = 0; while ((n = ip.read(bb)) > 0) os.write(bb, 0, n); os.close(); ip.close(); }

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