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foreach( QString key, keys ) foreach( int value, multi.values(key) ) qDebug() << key << ": " << value; There is a quicker way to find all the items in a QMultiMap: use an iterator. A QMultiMap:: iterator has the member functions key and value, which are used to get the information that it contains. Iterators can also be used to find all the items for a given key in a highly efficient way. Using the find method, you can get an iterator that points to the first item belonging to a given key. As the keys are sorted, you can reach all items belonging to a given key by iterating until the iterator from find reaches the end of the QMultiMap or another key (Listing 1-28 shows an example). The iterator approach also avoids having to build a list with all the items belonging to the key, which is what happens when you use the values method saving both memory and time. Listing 1-28. Finding the items for a given key using an iterator QMultiMap<QString, int>::ConstIterator ii = multi.find( "foo" ); while( ii != multi.end() && ii.key() == "foo" ) { qDebug() << ii.value(); ++ii; }

The string assigned to the apiKey variable indicates that it is to look up the value of the API key in the key attribute defined in the keys section of the definition file.

Take a look at any e-mail message, and ask your mail client to display all of the headers; you should be able to see every step that the message.

In the start of this section, I said that all the information also applies to the QMultiHash class. Listing 1-29 shows this by performing the same task as in Listing 1-26, Listing 1-27, and Listing 1-28. The highlighted lines contain the changes needed only changes of which class to use. The only possible difference in outcome is that the keys are returned in an arbitrary order. Notice that this does not mean that the find and iterate method fails the keys appear in an arbitrary order, but are still in order. Listing 1-29. Finding the items for a given key using an iterator QMultiHash<QString, int> multi; multi.insert( "foo", 10 ); multi.insert( "foo", 20 ); multi.insert( "bar", 30 ); QSet<QString> keys = QSet<QString>::fromList(multi.keys());

took toward its destination. (An exception is spam messages: spammers often write several fictitious Received headers at the top of their messages to make it look like the message has originated from a reputable organization.) Finally, there is probably a Delivered-to header that is written when the last server in the chain is finally able to triumphantly write the message to physical storage in someone s mailbox. Because each server tends to add its Received header to the top of the e-mail message this saves time, and prevents each server from having to search to the bottom of the Received headers that have been written so far you should read them backward : the oldest Received header will be the one listed last, and as you read up the screen toward the top, you will be following the e-mail from its origin to its destination. Try it: bring up a recent e-mail message you have received, select its View All Message Headers or Show Original option, and look for the received headers near the top. Did the message require more, or fewer, steps to reach your in-box than you would have expected

foreach( QString key, keys ) foreach( int value, multi.values(key) ) qDebug() << key << ": " << value; QMultiHash<QString, int>::ConstIterator ii = multi.find( "foo" ); while( ii != multi.end() && ii.key() == "foo" ) { qDebug() << ii.value(); ++ii; }

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