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n 5, you learned how to create pages with the Popfly Page Creator and how to embed your mashup creations in them to share your mashups with the Popfly community. In this chapter, we are going to explore four more ways you can share your mashups outside of the Popfly community.

When it comes to letting the user make choices, there are many dialogs that the users expect. There are dialogs for opening and saving files, picking colors, choosing fonts, and so on. These dialogs look different on the different platforms supported by Qt. By using Qt s implementations of these dialogs, you get access to one class interface, which ensures that you use the native version whenever possible and fall back on a generic version if needed.

You can also supply getaddrinfo() with the attributes of a socket that is already connected to a remote peer, and get a canonical name in return: >>> mysock = old_sock.accept() >>> addr, port = mysock.getpeername() >>> getaddrinfo(addr, port, mysock.family, mysock.type, mysock.proto, ... socket.AI_CANONNAME) [(2, 1, 6, 'rr.pmtpa.wikimedia.org', ('208.80.152.2', 80))] Again, this will work only if the owner of the IP address happens to have a name defined for it (and, obviously, it requires the hostname lookup to succeed).

The most common dialogs are the file dialogs used to open and save documents. These dialogs are all accessed through the QFileDialog class. Because the dialog is used for the same tasks over and over again, the class has been equipped with a set of static methods that handle the showing (and waiting for) the dialogs.

The examples just given showed the operation of three of the most important getaddrinfo() flags The flags available vary somewhat by operating system, and you should always consult your own computer's documentation (not to mention its configuration!) if you are confused about a value that it chooses to return But there are several flags that tend to be cross-platform; here are some of the more important ones: AI_ALL: We have already discussed that the AI_V4MAPPED option will save you in the situation where you are on a purely IPv6-connected host, but the host to which you want to connect advertises only IPv4 addresses: it resolves this problem by mapping the IPv4 addresses to their IPv6 equivalent But if some IPv6 addresses do happen to be available, then they will be the only ones shown.

To open a file, the static getOpenFileName method is used. This shows a file dialog similar to the one shown in Figure 3-20. The method accepts a whole bunch of arguments. The easiest way to understand how it is used is to look at Listing 3-11.

Before you show your mashup to the world, you may want to make some minor quick changes. First, you need to choose the mashup to share from among your mashup creations shown by selecting Main Menu My Stuff Projects from the main screen. I ve chosen to work with the photo mashup we created earlier. Figure 6-1 shows all of the options available to you once you ve selected the mashup: Project Details, Edit, Tweak It, Delete, Share.

Thus the existence of this option: if you want to see all of the addresses from your IPv6connected host, even though some perfectly good IPv6 addresses are available, then combine this AI_ALL flag with AI_V4MAPPED and the list returned to you will have every address known for the target host AI_NUMERICHOST: This turns off any attempt to interpret the hostname parameter (the first parameter to getaddrinfo()) as a textual hostname like cernch, and only tries to interpret the hostname string as a literal IPv4 or IPv6 hostname like 7420723478 or fe80::fcfd:4aff:fecf:ea4e This is much faster, as no DNS round-trip is incurred (see the next section), and prevents possibly untrusted user input from forcing your system to issue a query to a nameserver under someone else's control AI_NUMERICSERV: This turns off symbolic port names like www and insists that port numbers like 80 be used instead.

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