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First, what if we bind solely to an external interface Run the server like this, using whatever your operating system tells you is the external IP address of your system: $ python udp_remotepy server 1921685130 Listening at ('1921685130', 1060) Connecting to this IP address from another machine should still work just fine: $ python udp_remotepy client guinness Client socket name is ('192168510', 35084) Waiting up to 01 seconds for a reply The server says 'Your data was 23 bytes' But if you try connecting to the service through the loopback interface by running the client script on the same machine, the packets will never be delivered: $ python udp_remotepy client 127001 Client socket name is ('127001', 60251) Waiting up to 01 seconds for a reply Traceback (most recent call last): ...

// Add one tag, total three c.addTag( id, "Baz" ); QCOMPARE( c.getTags().count(), 3 ); // Add a duplicate tag, total three c.addTag( id, "Foo" ); QCOMPARE( c.getTags().count(), 3 ); // Try to add a tag to a nonexisting id QEXPECT_FAIL("", "The tag will be added to the non-existing image.", Continue); c.addTag( id+1, "Foz" ); QCOMPARE( c.getTags().count(), 3 ); // The ImageConnection adds a database that we close here QSqlDatabase::removeDatabase( QLatin1String( QSqlDatabase::defaultConnection ) ); }

This chapter teaches you to use Popfly s Block Creator to create or add your block to the Popfly environment for use in mashups. The Block Creator is not as rich as an integrated development environment like Visual Web Developer, but it has some basic code completion functionality to help you write your block code. You will also learn how to copy, or rip, code from other blocks to help you learn how it works or to give you a head start on your own blocks.

socketerror: [Errno 111] Connection refused Actually, on my operating system at least, the result is even better than the packets never being delivered: because the operating system can see whether one of its own ports is opened without sending a packet across the network, it immediately replies that a connection to that port is impossible! You might think this means that programs running on the localhost cannot now connect to the server Unfortunately, you would be wrong! Try running the client again on the same machine, but this time use the external IP address of the box, even though the client and server are both running there: $ python udp_remotepy client 1921685130 Client socket name is ('1921685130', 34919) Waiting up to 0.

The next test case, which is shown in Listing 16-24, checks that the image storage and retrieval mechanisms work and are implemented in the testImages slot. The test procedure is very simple: Add an image to the database (tests addImage), make sure it is there (tests getIds), retrieve it (tests getImage), and compare it with the original image. One final test, which has been commented out, attempts to retrieve an image using an invalid id. This results in a call to qFatal in the ImageCollection class, and the application will end even if you call QTest::ignoreMessage(QString). The ignoreMessage can otherwise be handy to avoid showing expected warning messages emitted using qDebug or qWarning. Listing 16-24. Testing storing and retrieving images void ImageCollectionTest::testImages() { ImageCollection c; QCOMPARE( c.getIds( QStringList() ).count(), 0 ); QImage image( "test.png" ); c.addImage( image, QStringList() ); // Verify that we have one image and get the id for it QList<int> ids = c.getIds( QStringList() ); QCOMPARE( ids.count(), 1 ); int id = ids[0]; QImage fromDb = c.getImage( id ); QVERIFY( pixelCompareImages( image, fromDb ) );

1 seconds for a reply The server says 'Your data was 23 bytes' Do you see what happened Programs running locally are allowed to send requests that originate from any of the machine s IP addresses that they want even if they are just using that IP address to talk back to another service on the same machine!.

// Will call qFatal and end the application // QTest::ignoreMessage( QtFatalMsg, "Failed to get image id" ); // fromDb = c.getImage( id+1 ); // QVERIFY( fromDb.isNull() ); // The ImageConnection adds a database that we close here QSqlDatabase::removeDatabase( QLatin1String( QSqlDatabase::defaultConnection ) ); }

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