crystal reports data matrix native barcode generator

crystal reports data matrix native barcode generator

crystal reports data matrix

crystal reports data matrix native barcode generator

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The syntax and rules that define a regular expression are similar to those used by Perl 5. Although no single rule is complicated, there are a large number of them, and a complete discussion is beyond the scope of this book. However, a few of the more commonly used constructs are described here. In general, a regular expression is comprised of normal characters, character classes (sets of characters), wildcard characters, and quantifiers. A normal character is matched as is. Thus, if a pattern consists of "xy", the only input sequence that will match it is "xy". Characters such as newlines and tabs are specified using the standard escape sequences, which begin with a backslash (\). For example, a newline is specified by \n. In the language of regular expressions, a normal character is also called a literal. A character class is a set of characters. A character class is specified by putting the characters in the class between brackets. For example, the class [wxyz] matches w, x, y, or z. To specify an inverted set, precede the characters with a circumflex (^). For example, [^wxyz] matches any character except w, x, y, or z. You can specify a range of characters using a hyphen. For example, to specify a character class that will match the digits 1 through 9, use [1 9]. The wildcard character is the dot (.), and it matches any character. Thus, a pattern that consists of "." will match these (and other) input sequences: "A", "a", "x", and so on. A quantifier determines how many times an expression is matched. The quantifiers are shown here:

And finally, spawn the listener thread and close out the initializer:

After you set up the MPMusicPlayerController, quite a few settings are available to further control the iPod (see table 12.3).

A Close Look at retrieveLinks( )

Table 12.3 Common iPod control properties Description The current playback time in seconds. A reference to the currently playing item in the queue. The current playback state of the media player. The states are stopped, playing, paused, interrupted, seeking forward, and seeking backward. The repeat mode of the player. The repeat modes are default, none, one, and all. The shuffle mode of the player. The shuffle modes are default, off, songs, and albums. The volume of the player. This is a float value between 0.0 and 1.0.

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See the documentation for the names of the constants for playbackState, repeatMode, and shuffleMode. The MPMusicPlayerController provides a full set of methods that you d expect to control the playback of the iPod. Table 12.4 provides a complete list of these methods as well as their descriptions. As you can see, the API gives you quite a bit of control over the iPod. With all of these controls, you re able to create fully featured media playback applications. In the next section, we ll show you how to put it all together, and you ll create a simple media player application.

// start the listener thread [NSThread detachNewThreadSelector:@selector(listenThread) toTarget:self withObject:nil]; } return self; }

The retrieveLinks( ) method uses the regular expression API to obtain the links from a page. It begins with these lines of code:

The final steps in your program are all pretty simple and Figure 3.2 Hello, World! is standard. First, you connect your label and your window easy to program on the by using the window s addSubview method. This is a stan- iPhone using the SDK. dard (and important!) method for adding views or view controllers to your window. You ll see it again and again. Second, you create your window on the screen, using the line of code that was there when you started. Making the window key means it s now the prime recipient of user input (for what that s worth in this simple example), whereas making it visible means that the user can see it. Third, do you remember the standard rule that you must release anything you allocated Here, that s the label. And that s a simple Hello, World! program, completely programmed and working, with some neat graphical nuances. Although it was sufficient for this purpose, Hello, World! didn t make much use of the class creation that s possible in an object-oriented language. Sure, you depended on some existing classes including UIColor, UILabel, and UIWindow but all of your new code went into a single function, and you didn t create any classes of your own. We ll address this issue in section 3.4, when you start working with new classes.

// Compile link matching pattern. Pattern p = Pattern.compile("<a\\s+href\\s*=\\s*\" (.* )[\"|>]", Pattern.CASE_INSENSITIVE); Matcher m = p.matcher(pageContents);

Creating a first iPad project in Xcode: Hello, World!

The -listenThread method will read all of the data coming in from the network, and we ll actually write that method a bit later on, after we re finished with the data transmission code. Let s not forget the dealloc. Even though this object will stick around for the lifetime of the application, adding dealloc is a good habit:

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