... điểm kĩ thuật Bluetooth so sánh Bluetooth với vài công nghệ không dây khác Chương Vấnđềantoànbảomật Bluetooth: Phân tích vấnđềantoànbảo mật, hacking, virus, giải pháp bảomậtBluetooth Chương ... 74 Chương VẤNĐỀANTOÀN VÀ BẢOMẬTTRONGBLUETOOTH 77 3.1 Sơ lược vấnđềbảomậtchuẩn không dây 77 3.1.1 Sơ lược chuẩnbảomật mạng không dây 802.11 77 3.1.2 Chuẩnbảomật WEP IEEE 802.11 ... 77 3.1.3 Nhữngvấnđề nảy sinh an ninh mạng không dây 79 3.2 Qui trình bảomậtBluetooth : 81 3.2.1 Antoànbảomật Bluetooth: 81 3.2.1.1 Phần mô tả antoànbảo mật: ...
... Thái An – Trần Thị Mỹ Hạnh 128 Tìm hiểu công nghệ Bluetooth viết ứng dụng minh họa 3.3 Các giải pháp antoànbảomật sử dụng công nghệ mạng Bluetooth 3.3.1 Những mẹo antoàn cho thiết bị Bluetooth: ... and Power Consumption) Trong 2005, Bluetooth SIG kiểm tra đưa phiên kỹ thuật nhằm nâng cao tính tiện lợi trường hợp multi-device, hoàn thiện toàn diện vấnđềantoànbảomật cải tiến “đột ngột” ... xuất khác • Bảomật : Cho phép trao đổi liệu antoàn • Mạnh mẽ ( Robustness) : Symbian OS quản lý truy cập liệu người dùng, đảm bảotoàn vẹn liệu, có trao đổi thông tin không antoàn tài nguyên...
... tự với số hiệu cổng gói tin xác thực thường xuyên, điều đảm bảo gói tin đến đích thứ tự mà tạo Bảomật TCP có tính bảomật cao UDP Trong nhiều tổ chức, firewall router cấm gói tin UDP, điều ... try { UDPServer server=new UDPEchoServer(); server.start(); System.out.println("Server dang da san sang lang nghe lien ket "); } catch(SocketException e) { System.err.println(e); } } } Client ... liên kết Vì UDP không sử dụng tín hiệu handshaking, nên tránh thời gian trễ Đó lý DNS thường sử dụng giao thức UDP TCP-DNS chậm nhiều dùng TCP Tốc độ UDP nhanh so với TCP Bởi điều này, nhiều ứng...
... don’t change the appearance of the selection when tapped (except with a temporary highlight) Despite their similar appearance, the two items share no inheritance other than a common ancestor ... to mess withthe tab bar at all; you can all the modifications you require through either the tab bar controller or the view controllers The connection between the tab bar controller and its ... to is lay out objects in the two xib files and/or make changes to their accompanying class files Then you can build controller actions, events, and other activities into the two controller files...
... of the data the callback needs to know about the state of the audio file and the state of the queue It’s handed off to the callback as part of the function call Figure 18.5 depicts most of these ... startAnimating Method Starts the animation stopAnimating Method Stops the animation To load a normal image, you could use the image property, but there’s usually little reason to use it rather than ... partially transparent Here you’re using a normal blend, but only 50 percent transparency (hence the use of the drawAtPoint: method) The rest of the code is standard enough The simplicity of using these...
... startangle, endangle, clockwise Creates an arc, withthe angles defined in radians A line will be drawn to the start point if there are previous entries in the path, and from the end point if there ... applied withthe translation before the rotation, and the results if they’re applied in the opposite order Figure 19.2 As these variant transformations show, order matters The left picture is untransformed; ... Makes an array withthe scale CGAffineMakeTranslation x-change, y-change Makes an array withthe translation CGAffineTransformRotate array, radian rotation Rotates the array CGAffineTransformScale...
... an NSDictionary of the header HTTPBody Returns an NSData withthe body valueforHTTPHeaderField: Returns an NSString withthe header The catch with these properties is that you can only work with ... JSON and creating yet another link between your users’ iPhones and the whole world wide web 20.8 Summary “There’s more than one way to it.” That was the slogan of Perl, one of the first languages ... withan NSURLRequest, which you must have created using the two-step process that we described in the previous section, but you can also load a web view withan NSURL and an NSString A few other...
... that point, the member can choose to compile onto a device rather than to the iPhone Simulator by changing the pop-up window at the top-left of Xcode C.3 Preparing for distribution via the iPhone ... information and giving you the OK for the program They’ll then send you an email that’ll allow you to finish your registration At this point, expect to pay a fee, currently $100 (standard) or ... Data that can be changed NSMutableDictionary NSDictionary A dictionary that can be changed NSMutableSet NSSet A set that can be changed NSMutableString NSString A string that can be changed NSMutableURLRequest...
... GPSs, they can both be accessed through the iPhone SDK using the same interface Of these hardware features, the ones that really stand out are the accelerometers and the GPS, which are not the ... Understanding the iPhone’s place within the industry can help us to better understand how it’s differentiated from the rest of the pack How the iPhone compares to the industry 1.2.1 The physical ... competitors, the iPhone produces an internet experience that is more usable, better integrated, and more constant than thestandard mobile experience The improvements in usability stem from the innovative...
... using the right tool for the job at hand 2.3 Advantages and disadvantages Each of the web and SDK development models has its own advantages and disadvantages We’ve summarized the biggest advantages ... time your users access the page (or, in the worst case, the next time they update their cache), they’ll see all your bug fixes and other changes Similarly, you can constantly give users access ... be Even an occasionally connected application might benefit from being native to the iPhone, as they can provide constant access to “old” data This goes hand in hand withthe fact that the applications...
... loaded On the other hand, the user might be confused about where the URL bar went to, since it went away without the user doing anything Some developers like the ability to instantly give their iPhone ... the iPhone’s chrome and the limited ways in which you can adjust it using standard web techniques 3.4.1 The three bars The iPhone chrome consists of all those elements that appear at either the ... nothing official In the meantime, the WebKit and Canvas offer some weak alternatives for animation, as described in chapters and Java Sun announced plans to support Java on the iPhone in 2008,...
... the big stuff, starting with a variety of advanced CSS methods that you can use to manipulate and animate the content of your web page 4.2 CSS transforms, transitions, and animations One of the ... transition (possibly including all of them), how long the transition should last, and how the transition should work Then, when the block of text changes to the endpoint class, a smooth and animated ... marked withan *, is optional, meaning that the simplest call to a transaction just sends the SQL and any arguments The first two handlers are for individual queries, and the last two handlers...
... the button to the right The leftButton can be stacked withthe button to instead push the button to the left The blueButton can be stacked with either button to make it blue instead of gray These ... The thumb class is left blank, as has been the case with other iUI classes in the past, and will be replaced withthe thumb slider graphic The contents of toggleOn and toggleOff define what the ... techniques than an actual language It combines JavaScript and XML (as you’d expect from the name) with DOM The concept behind Ajax is that the web browser exchanges small amounts of data withthe web...
... drawn from the start angle to the end angle Why “anticlockwise” instead of “clockwise,” you ask? It’s another standard when using radians Once you’ve got these basics, you can draw a circle The following ... There is only one shape in thestandard Canvas library, and that’s the rectangle Beyond that, you can write your own functions to draw other shapes 6.3.1 Drawing rectangles You can draw rectangles ... paths, and transformations Piling all of these Canvas changes together can get confusing; worse, they can really limit the order in which you can things Fortunately, there’s a way that you can save...
... screen changes into another In the iPhone SDK, these transitions are usually fancy animations involving pages sliding on top of each other, and that’s what’s being reflected here Thestandard transition ... gauge from the Parts library to the top center of your Dashcode canvas Adjust the gauge Pop up an inspector window and click on the Attributes tab In the Values section, change the range to go ... 359, to allow the full range of values Change the threshold to and warning and critical to 360, to make sure the gauge always remains green In the Geometry section, change the angles to go from...
... understanding the iPhone’s key features Knowing them and what they mean is as important to writing iPhone code as the actual features and functions we’ve been discussing An always-on internet is the ... champing at the bit to more: that you’ll want to get into the guts of the iPhone and learn how to create native applications that can better utilize the iPhone’s unique features and that can run with ... performance analysis—is important for any type of computer program But we’ve gotten sloppy about profiling web pages in the last several years as bandwidth has gotten cheaper and more abundant With...
... a memory address rather than to the data itself When this is the case, you can dereference the memory address, and thus access your data, withthe * character For example, the following would ... controller sits between the view and Figure 9.2 The MVC model covers how user the model, accepting user input and modiinput and other changes affect your program’s fying the other elements appropriately ... of the variables as it sees fit Classes gain power because they support inheritance That means that you can subclass an existing class Your subclass starts off with all the default variables and...
... Sometimes you’ll want to send an argument withan init You can so withan initialization function that you name using the format initWithArgument: Other than the fact that you’re sending it an argument, ... instantiate an object from a class Generally object instantiation will follow the same pattern First, you allocate memory for the object, and then you initiate any variables and perform any other ... but they all ultimately fall back to a two-step procedure that uses the alloc class method and the init instance method The alloc method allocates the memory for your object, and then returns the...
... rectangle C Much as with Canvas, the SDK uses a grid withthe origin (0,0) set at the top left Your rectangle’s starting point is thus 50 to the right and 50 down (50,50) from the origin The ... or other files to your projects, you’ll so here The left pane also contains some other useful elements, in particular an Errors and Warnings item that you can click open to quickly see any problems ... frame property can be passed a rectangle, just like the initWithFrame: method Alternatively, you can use its center property to designate where the middle of the object goes and the bounds property...
... use the Size tab to adjust the size and position of an object Figure 12.5 shows the options you can change here This tab leads off with values for size and position Not only can you change an ... you select all the objects you want to align (by Figure 12.5 You can change an object’s Shift-clicking) and then choose the appropriate positioning and size from the Size tab box in the Alignment ... drag an appropriate object to the nib document window Change the class Open the Identity inspector tab, and change the class name to your new class We say that you start the process withan “appropriate...