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The final test case, testImagesFromTags, is shown in Listing 16-25. The test can seem rather confusing at first, but the principle is to check that the correct number of image ids is returned for each given tag. To do this, one image is added at a time; then the getIds method is called, and the number of returned ids is compared with the expected result. The entire procedure is described as follows: 1. Add an image with the tags Foo and Bar. 2. Verify that getTags returns two tags. 3. Verify the number of ids returned for Foo, Bar, and Baz; and a list containing Foo and Bar. 4. Add an image with the tag Baz. 5. Verify that getTags returns three tags. 6. Verify the number if ids returned for Foo, Bar, and Baz. 7. Add an image with the tags Bar and Baz. 8. Verify that getTags returns three tags. 9. Verify the number of ids returned for Foo, Bar, and Baz; and a list containing Bar and Baz. To determine the number of expected ids for each set of tags, it is important to remember that getIds is expected to return each image that has at least one of the given tags. This means that when querying for images with Bar or Baz, all three image ids are returned. The first image contains Bar, the second contains Baz, and the third contains both. Listing 16-25. Testing images and tags at once void ImageCollectionTest::testImagesFromTags() { ImageCollection c; QCOMPARE( c.getIds( QStringList() ).count(), 0 ); QImage image( "test.png" );

So binding to an IP interface might limit which external hosts can talk to you; but it will certainly not limit conversations with other clients on the same machine, so long as they know the IP address that they should use to connect Second, what happens if we try to run two servers at the same time Stop all of the scripts that are running, and we can try running two servers on the same box One will be connected to the loopback: $ python udp_remotepy server 127001 Listening at ('127001', 1060) And then we try running a second one, connected to the wildcard IP address that allows requests from any address: $ python udp_remotepy server Traceback (most recent call last): .. socket.

Some knowledge of JavaScript and the technologies surrounding it, like AJAX and JSON, would be very helpful, as would knowledge of XML. No experience with Popfly is needed, and experience with software development kits (SDKs) and integrated development environments (IDEs) is not required but will be helpful.

QStringList tags; tags << "Foo" << "Bar"; c.addImage( image, tags ); QCOMPARE( c.getTags().count(), 2 ); QCOMPARE( c.getIds( QStringList() ).count(), 1 ); QCOMPARE( c.getIds( QStringList() << "Foo" ).count(), 1 ); QCOMPARE( c.getIds( QStringList() << "Bar" ).count(), 1 ); QCOMPARE( c.getIds( tags ).count(), 1 ); QCOMPARE( c.getIds( QStringList() << "Baz" ).count(), 0 ); tags.clear(); tags << "Baz"; c.addImage( image, tags ); QCOMPARE( c.getTags().count(), 3 ); QCOMPARE( c.getIds( QStringList() ).count(), 2 ); QCOMPARE( c.getIds( QStringList() << "Foo" ).count(), 1 ); QCOMPARE( c.getIds( QStringList() << "Bar" ).count(), 1 ); QCOMPARE( c.getIds( tags ).count(), 1 ); QCOMPARE( c.getIds( QStringList() << "Baz" ).count(), 1 ); tags.clear(); tags << "Bar" << "Baz"; c.addImage( image, tags ); QCOMPARE( c.getTags().count(), 3 ); QCOMPARE( c.getIds( QStringList() ).count(), 3 ); QCOMPARE( c.getIds( QStringList() << "Foo" ).count(), 1 ); QCOMPARE( c.getIds( QStringList() << "Bar" ).count(), 2 ); QCOMPARE( c.getIds( tags ).count(), 3 ); QCOMPARE( c.getIds( QStringList() << "Baz" ).count(), 2 ); // The ImageConnection adds a database that we close here QSqlDatabase::removeDatabase( QLatin1String( QSqlDatabase::defaultConnection ) ); } bool ImageCollectionTest::pixelCompareImages( const QImage &a, const QImage &b ) { if( a.size() != b.size() ) return false; if( a.format() != b.format() ) return false; for( int x=0; x<a.width(); ++x ) for( int y=0; y<a.height(); ++y ) if( a.pixel(x,y) != b.pixel(x,y) ) return false; return true; }

error: [Errno 98] Address already in use Whoops! What happened We have learned something about operating system IP stacks and the rules that they follow: they do not allow two different sockets to listen at the same IP address and port number, because then the operating system would not know where to deliver incoming packets And both of the servers just shown wanted to hear packets coming from the localhost to port 1060 But what if instead of trying to run the second server against all IP interfaces, we just ran it against an external IP interface one that the first copy of the server is not listening to Let us try: $ python udp_remotepy server 1921685130 Listening at ('1921685.

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