...
1.5. Khi nào thì nên sử dụng UDP
Rất nhiều ứngdụng trên Internet sử dụng UDP. Dựa trên các ưu và nhược điểm của
UDP chúng ta có thể kết luận UDP có ích khi:
Sử dụngcho các phương thức truyền ... s.toUpperCase();
dp.setData(s.getBytes());
Sưu tầm bởi: www.daihoc.com.vn
171
Chương 7
Lập trìnhứngdụngcho giao thức UDP
1. Tổng quan về giao thức UDP
TCP/IP là một họ các giao thức được ... thức TCP/IP.
Các tầng OSI
Họ giao thức
TCP
TCP/IP Stack
7 Tầng ứngdụng
Tầng ứngdụng
HTTP
FTP
SMTP
RIP
DNS
6 Tầng trình diễn
5 Tầng phiên
4 Tầng giao vận Tầng giao vận TCP UDP
3...
... dismissModalViewControllerAnimated:YES];
You could design your own modal view controllers for when you want to have users
make a choice before returning them to their regular program. More commonly, you’ll
use picker controllers ...
ViewController
within your program.
15.3 Using the flipside controller
To create a flipside controller, choose the Utility
Application template when you start a new proj-
ect. It will create a small ... also do some slightly more complex
things, either during setup or at runtime.
At setup you can choose to create a navigational
hierarchy and push a user into it before he or she
takes any actions....
... You’re
placing buttons on the toolbar that call three methods:
choosePic:
,
takePic:
(when
a camera’s available), and
savePic:
.
choosePic:
C
and
takePic:
D
are similar methods. Each ... integrated into the rest of
your application, it’s a pretty good choice—it often works well for video, but it’s a
somewhat more questionable choice for audio.
The Media Player framework includes two ... [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self
action:@selector(choosePic:)];
UIBarButtonItem *camButton = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemCamera...
... within a graphical context. You only
“paint” a path when it’s complete, at which point you can choose to either fill it or
stroke it.
Many of the functions required to define and draw paths ...
array
Applies the transformation
392
C
HAPTER
19
Graphics: Quartz, Core Animation, and OpenGL
include
anchorPoint
,
backgroundColor
,
opacity
,
position
,
transform
, and several
others. This means ... graphical contexts from you as a programmer. Now that you’re fully
immersed in Quartz, you can choose to use the Core Graphic functions instead.
THE IMAGE FUNCTIONS
There are two major Core...
... method has its own advantages, and we
continue to think that web development is often a better choice when you’re interacting
C
422
C
HAPTER
20
The web: web views and internet protocols
with ... iPhone web apps using
HTML
,
CSS
, JavaScript, and the
dynamic programming language of your choice. As we said at the time, web devel-
opment is one of two major ways that you can program ... the user touches the web view,
but we wanted to show the
UIWebView
delegate meth-
ods, so we chose this slightly more circuitous route.
And that’s it—a simple web thumbnail program, as
shown...
... mechanism special-
ized for searches
UISegmentedControl UIControl
A control for making one of sev-
eral choices
UISlider UIControl
A control for setting discrete
values
Table A.1 A listing of the most ...
CSR
, download a certificate, and download a provisioning
profile. From that point, the member can choose to compile onto a device rather than
to the iPhone Simulator by changing the pop-up window...
... over wi-fi, but that can
be pushed much higher on a good network. Multiple streaming rates always choose
the optimal method for the current network interface—which brings us to the ques-
tion of ... we’ll look at more of the differences between web develop-
ment and the SDK so that you can better choose which of them to use for any individ-
ual development project.
10 CHAPTER 1 Introducing the ... Mode
Figure 1.1 The iPhone supports
two dramatically different views,
landscape and portrait. Choosing
between them is not just a
question of which is easier to read,
but also requires thinking...
... end-all of
iPhone software. We feel there are genuinely places where web development is a bet-
ter choice.
We’ll argue the reasons that you might select web development over
SDK right
here, in ... have to look great. You can
develop them quickly using the web and then your administrators can choose whether
to input data from their iPhones or from their desktops. Conversely, you want to...
... what it looks like. You’ll be able to
choose whether to have status-like bars or bottom bars depending on the needs of
your program. Once you’ve made a choice, you can just pick the right class ... Generally, you shouldn’t have to
change these last three values for redeveloped web pages, as a viewer choosing how
your page looks is what the web is all about. However, if there are good
UI reasons ...
controlling scalability or if you think a page looks particularly bad at certain scales,
you may choose to modify them. On the other hand, you probably should turn scaling
off for web apps, as...
... animate changes between styles
56 CHAPTER 4 Advanced WebKit and textual web apps
First, you might choose to build a textual web app, which is an application that is
largely built on the fundamentals ... Apple’s WebKit. We’ll be discussing this programming
method in this chapter.
Second, you might choose to build an iPhone-
UI web app, which is an application
with a user interface that looks ... we’ll also cover i
UI, a programming library meant to make this task easier.
Third, you might choose to build a graphical web app, which is an application that
pushes the boundaries of web...
... class="group">Entered <? echo $recent[$i][entrydate]; ?>
<?
}
$lastdate = $recent[$i][entrydate];
?>
<li>
<a href="display-entry.phtml?mainid=<?
echo $recent[$i][mainid]; ... $recent[$i][mainid]; ?>" target="_self"><?
echo $recent[$i][title]; ?></a>
<i><? echo $recent[$i][authors]; ?></i>
<?
}
?>
</ul>
</body>
[XHTML?]
You ... (see table 5.4).
You’ve already seen the majority of these attributes. The
cancel
and
submit
anchor
types both appeared in our dialog box, though they can appear in any type of form.
They give...
... overlap.
lighter
Blending choice Where the shapes overlap, the color value is added.
darker
Blending choice Where the shapes overlap, the color value is subtracted.
xor
Blending choice Where the shapes ... of each other.
Value Type Summary
source-over
Stacking choice New shapes are drawn on top of existing content.
destination-over
Stacking choice New shapes are drawn behind existing content.
copy
New ... be drawn. With
createLinearGradient
you’re defining a
Table 6.4 By setting variables, you can choose how your fills and strokes look.
Property Type Value Summary
fillStyle
Style variable CSS3...
... a few minutes in Dashcode.
Step Description
1. Create a project. Select File > New Project.
Choose a Custom project.
2. Create a gauge. Drag a gauge from the Parts library to the top center ... include
a left-rounded push button, a push but-
ton, and a right-rounded push button.
You can choose to put these buttons in
one of two places.
First, you could opt to place them in
a header. ... buttons
rounded corners (15px) and the middle button unrounded corners (0px). Finally,
you may choose to change the color of the text and the button background for the
current page.
Once you’ve...
... variety of tools for debugging.
After you install Firebug, you can activate it at any time by choosing Open Firebug
from among your Firefox tools. When you do that, a panel will appear along ... browser to see how
your iPhone web pages really work. On the Macintosh you’ve got three great
choices—Safari, Firefox, and the iPhone Simulator. Each has its own debug-
ging advantages.
8.2.1 ... Develop menu. If the Develop menu doesn’t appear, you can activate
it in the Safari preferences: choose the Advanced tab, and check the “Show Develop
Table 8.1 Setting up your local Macintosh...