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In a real application, the language to be used is likely to be set on each request so that each user sees pages in their own language In this section, I ll show you one way of setting this up You ll remember from 9 that each controller can have a __before__() method, which is run before each controller action This is a great place to set the language to be used for that controller You can also use Pylons session global to store the language to be used when the user signs in Replace the index() action with this: def signin(self): # Place your sign in code here # Replace this with code to set the language for the signed in user session['lang'] = requestparamsgetone('lang') sessionsave() return 'Signed in, language set to %s'%requestparams.

public class AESEncrypter { public static final int IV_SIZE = 16; // 128 bits public static final int KEY_SIZE = 16; // 128 bits public static final int BUFFER_SIZE = 1024; // 1KB Cipher cipher; SecretKey secretKey; AlgorithmParameterSpec ivSpec; byte[] buf = new byte[BUFFER_SIZE]; byte[] ivBytes = new byte[IV_SIZE]; public AESEncrypter(SecretKey key) throws Exception { cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); secretKey = key; } public void encrypt(InputStream in, OutputStream out) throws Exception { // create IV and write to output ivBytes = createRandBytes(IV_SIZE); out.write(ivBytes); ivSpec = new IvParameterSpec(ivBytes); cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivSpec); // Bytes written to cipherOut will be encrypted CipherOutputStream cipherOut = new CipherOutputStream(out, cipher);

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Figure 7-13. You can draw text in many different ways. First of all, you need to create a QPixmap to draw to and a QPainter to draw with. You also have to fill the pixmap with white and set the pen of the painter to be black: QPixmap pixmap( 200, 330 ); pixmap.fill( Qt::white ); QPainter painter( &pixmap ); painter.setPen( Qt::black ); Draw the text at the top of the figure, which originates at a QPoint. The following source code shows you the drawText call is used. The following drawLine class simply marks the point used with a cross (you can see this cross in Figure 7-13 on the left of the top text). QPoint point = QPoint( 10, 20 ); painter.drawText( point, "You can draw text from a point..." ); painter.drawLine( point+QPoint(-5, 0), point+QPoint(5, 0) ); painter.drawLine( point+QPoint(0, -5), point+QPoint(0, 5) ); Drawing text from a point has its advantages it is an easy way to get text onto the screen. If you need more control, you can draw text in a rectangle, which means that you can align the text to the right, left, or center horizontally (also at the top, bottom, or center vertically). The enumerations used for alignment are summarized in this list: Qt::AlignLeft: Align left Qt::AlignRight: Align right

getone('lang') def __before__(self): if 'lang' in session: set_lang(session['lang']) def index(self): return _(u'Hello!') When a user signs in, their language is set and saved in the session On each subsequent request, the language is looked up in the session and set automatically before each action is called To test this, visit http://localhost:5000/hello/signin lang=es You ll see the message telling you have been signed in Now visit http://localhost:5000/hello/index, and you ll see the message in the language you signed in with, which in this case is Spanish If you want to set the language for each request in every controller rather than dealing with each controller individually, you could write some similar code at the top of the lib/basepy BaseController class s __call__() method instead of in an individual controller s __before__() method: def __call__(self, environ, start_response): """Invoke the Controller""" # WSGIController.

// Read in the plaintext bytes and write to cipherOut to encrypt int numRead = 0; while ((numRead = in.read(buf)) >= 0) cipherOut.write(buf, 0, numRead); cipherOut.close(); } public void decrypt(InputStream in, OutputStream out) throws Exception { // read IV first in.read(ivBytes); ivSpec = new IvParameterSpec(ivBytes); cipher.init(Cipher.DECRYPT_MODE, secretKey, ivSpec); // Bytes read from in will be decrypted CipherInputStream cipherIn = new CipherInputStream(in, cipher); // Read in the decrypted bytes and write the plaintext to out int numRead = 0; while ((numRead = cipherIn.read(buf)) >= 0) out.write(buf, 0, numRead); out.close(); } public static byte [] createRandBytes(int numBytes) throws NoSuchAlgorithmException { byte [] bytesBuffer = new byte [numBytes]; SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); sr.nextBytes(bytesBuffer); return bytesBuffer; } public static void main(String argv[]) throws Exception { if (argv.length != 2) usage(); String operation = argv[0]; String keyFile = argv[1]; if (operation.equals("createkey")) { FileOutputStream fos = new FileOutputStream(keyFile); KeyGenerator kg = KeyGenerator.getInstance("AES"); kg.init(KEY_SIZE*8); SecretKey skey = kg.generateKey(); /* write key */ fos.write(skey.getEncoded()); fos.close(); } else { /* read key */

__call__ dispatches to the Controller method # the request is routed to This routing information is # available in environ['pylonsroutes_dict'] if 'lang' in session: set_lang(session['lang']) return WSGIController__call__(self, environ, start_response).

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