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let pw_hash_to_string pwf = let buf = Buffer.create 100 in Hashtbl.iter (fun x y -> Buffer.add_string buf (x ^ ":" ^ y ^ "\n")) pwf.data; Buffer.contents buf;; let save_pwfile pwf = let fle = Unix.openfile pwf.location [Unix.O_CREAT;Unix.O_TRUNC;Unix.O_SYNC;Unix.O_WRONLY] 0o640 in Unix.lockf fle Unix.F_LOCK 0; let pwfs = pw_hash_to_string pwf in let i = Unix.write fle pwfs 0 (String.length pwfs) in if (i = (String.length pwfs)) then (Unix.lockf fle Unix.F_ULOCK 0; Unix.close fle) else raise (Password_file "Failed to save");; let add_password uname pass pwf = Hashtbl.replace pwf.data uname pass;save_pwfile pwf;; let verify uname pass passwordfile = let pwf = load_pwfile passwordfile in if (Hashtbl.mem pwf.data uname) then let pa = Hashtbl.find pwf.data uname in pa = pass else false;; let set_file_location x = file_location := x let init () = passfile := load_pwfile passfile.contents let full_init () = passfile := load_pwfile {location=file_location.contents; last_loaded=0.;data=Hashtbl.create 10};; let change uname pass = add_password uname pass passfile.contents;; let check uname pass = verify uname pass passfile.contents;; let add uname pass = change uname pass;; This Password module is designed to work in a multiuser environment. It uses Unix flockstyle file locking to prevent different processes from stomping on one another. The use of these locks is reasonably safe. These locks are only advisory, though, which means that they can be ignored. This fact is important to remember when using flock in your own programs. Generalized cookie support is not trivial to implement. Fortunately, someone has already done the hard work for you. To take advantage of this library, the code needs to be switched to using the Ocamlnet CGI library.

Part of the alliance s goal is to innovate rapidly and respond better to consumer needs, and its first key outcome was the Android Platform. Android was designed to serve the needs of mobile operators, handset manufacturers, and application developers. The members have committed to release significant intellectual property through the open source Apache License, Version 2.0.

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Listing 4 33 shows the layout file as well as the onCreate() method of the activity. The idea of the demonstration is to load two ImageView objects in the FrameLayout, with only one of the ImageView objects visible at a time. In the UI, when the user clicks the visible image, we hide one image and show the other one. Look at Listing 4 33 more closely now, starting with the layout. You can see that we define a FrameLayout with two ImageView objects (an ImageView is a control that knows how to display images). Notice that the second ImageView s visibility is set to gone, making the control invisible. Now look at the onCreate() method. In the onCreate() method, we register listeners to click events on the ImageView objects. In the click handler, we hide one ImageView and show the other one. As we said earlier, you generally use the FrameLayout when you need to dynamically set the content of a view to a single control. Although this is the general practice, the control will accept many children, as we demonstrated. Listing 4 33 adds two controls to the layout but has one of the controls visible at a time. The FrameLayout, however, does not force you to have only one control visible at a time. If you add many controls to the layout, the FrameLayout will simply stack the controls, one on top of the other, with the last one on top. This can create an interesting UI. For example, Figure 4 19 shows a FrameLayout with two ImageView objects that are visible. You can see that the controls are stacked, and that the top one is partially covering the image behind it.

Another interesting aspect of the FrameLayout is that if you add more than one control to the layout, the size of the layout is computed as the size of the largest item in the container. In Figure 4 19, the top image is actually much smaller than the image behind it, but because the size of the layout is computed based on the largest control, the image on top is stretched. Also note that if you put many controls inside a FrameLayout with one or more of them invisible to start, you might want to consider using setConsiderGoneChildrenWhenMeasuring(). Because the largest child dictates the layout size, you ll have a problem if the largest child is invisible to begin with. That is, when it becomes visible, it will be only partially visible. To ensure that all items get rendered properly, call setConsiderGoneChildrenWhenMeasuring() and pass it a value of true.

The authors of Ocamlnet have already provided the OCaml world with a library that can handle the parsing of CGI requests, cookies, and pretty much everything else you might want to do with regard to CGI.

Note Handset manufacturers do not need to pay any licensing fees to load Android on their handsets or

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