Free objective c tutorial software for linux

Derbrill Tutorials are Free Tutorials For Writing Games and Multimedia Applications in Runtime Revolution with ArcadeEngine.

The tutorials come in a visually appealing e-book format which is both easy to read and use, the range of topics covered includes:

* The basics of Revolution such as: stacks, cards, scripts, messages and timers
* How to use geometric properties such as distances, angles and intersection rectangles
* Understanding and using different movements including linear, polygonal, circular and elliptic
* Advanced use of images
* Using the built-in collision detection

Rose::DB::Object::Tutorial is a guided tour of the basics of Rose::DB::Object.

INTRODUCTION

This document provides a step-by-step introduction to the Rose::DB::Object module distribution. It demonstrates all of the important features using a semi-realistic example database. This tutorial does not replace the actual documentation for each module, however. The "reference" documentation found in each ".pm" file is still essential, and contains some good examples of its own.

This tutorial provides a gradual introduction to Rose::DB::Object. It also describes "best practices" for using Rose::DB::Object in the most robust, maintainable manner. If youre just trying to get a feel for whats possible, you can skip to the end and take a look at the completed example database and associated Perl code. But I recommend reading the tutorial from start to finish at least once.

The examples will start simple and get progressively more complex. You, the developer, have to decide which level of complexity or abstraction is appropriate for your particular task.

CONVENTIONS

Some of the examples in this tutorial will use the fictional My:: namespace prefix. Some will use no prefix at all. Your code should use whatever namespace you deem appropriate. Usually, it will be something like MyCorp::MyProject:: (i.e., your corporation, organization, and/or project). Ive chosen to use My:: or to omit the prefix entirely simply because this produces shorter class names, which will help this tutorial stay within an 80-column width.

For the sake of brevity, the use strict directive and associated "my" declarations have also been omitted from the example code. Needless to say, you should always use strict in your actual code.

Similarly, the traditional "1;" true value used at the end of each ".pm" file has been omitted from the examples. Dont forget to add this to the end of your actual Perl module files.

Although most of the examples in this tutorial use the base.pm module to set up inheritance, directly modifying the @ISA package variable usually works just as well. In situations where there are circular relationships between classes, the use base ... form may be preferable because it runs at compile-time, whereas @ISA modification happens at run-time. In either case, its a good idea to set up inheritance as early as possible in each module.

package Product;

# Set up inheritance first
use base qw(Rose::DB::Object);

# Then do other stuff...
...

Objective-C Foundation Classes is an Objective-C library.
It contains general purpose classes for easier development of applications, in areas such as data types, network, C library wrappers, collections, and compound classes.
The classes in the library are grouped in five clusters:
- DataTypes - integer, text string, fraction, bitarray, date/time, random generators, big integer, big double ...
- Collections - array, list, hash table, AVL and n-tree, circular array, graph ...
- Network - TCP/UDP server and client, HTTP client, Telnet client ...
- C-library wrappers - DBM, socket, MD5, regular expression, timer, file, directory, gzip and bzip2 file, text screen ...
- Compound - Argument parser, calendar, finite state machine, tokenizer, XML tree, discrete distribution, objective-c source tokenizer ...
Enhancements:
- A new class (DBigFraction) and a new protocol (DBitArithmetic) have been added to the library.
- There are also several bugfixes related to 64-bit platforms.
- The copy-constructor support has been improved, and as a result all collections can now be (deep) copied.
- There are some small bugfixes, and several classes have been extended with new methods.

Imager::Tutorial is an introduction to Imager.

Before you start

If you have the necessary knowledge, install the image format libraries you want Imager image file support for, and Imager itself, otherwise arrange to have it done.
You will also want some sort of image viewer tool, whether an image editor like Photoshop or the GIMP, or a web browser.

Hello Boxes! - A Simple Start

As with any perl program its useful to start with a #! line, and to enable strict mode:

#!/usr/bin/perl -w
# you might to use warnings; instead of the -w above
use strict;

These lines will be omitted in further examples.

As with any module, you need to load it:

use Imager;

Now create a image to draw on:

my $image = Imager->new(xsize => 100, ysize => 100);

and draw a couple of filled rectangles on it:

$image->box(xmin => 0, ymin => 0, xmax => 99, ymax => 99,
filled => 1, color => blue);
$image->box(xmin => 20, ymin => 20, xmax => 79, ymax => 79,
filled => 1, color => green);

Since the first box fills the whole image, it can be simplified to:

$image->box(filled => 1, color => blue);

and save it to a file:

$image->write(file=>tutorial1.ppm)
or die Cannot save tutorial1.ppm: , $image->errstr;

So our completed program is:

use Imager;

my $image = Imager->new(xsize => 100, ysize => 100);

$image->box(filled => 1, color => blue);
$image->box(xmin => 20, ymin => 20, xmax => 79, ymax => 79,
filled => 1, color => green);

$image->write(file=>tutorial1.ppm)
or die Cannot save tutorial1.ppm: , $image->errstr;

Bigtop::Docs::Tutorial is a simple case study of building a web app with bigtop.
Many (not all) applications are mostly data managers. That is, they are really intermediaries between users and various tables in a database. A bigtop file is meant to be a single place to describe all (or practically all) facits of the data in an application. This includes at least:
- The name and special features of each controller.
- The name of each table in the database.
- A description of each column (field) in each table in the database. This includes at least:
- its name and SQL type
- the label the user sees for it when it appears on the screen
- what type of html form element the user uses to enter or update it
- how the data is validated and filtered on its way into and out of the database (filtering yet supported)
- which table the field refers to if it is a foreign key
- etc.
All of these things, and more, are described in a Bigtop file. That file can be given to bigtop to build the application. Once it is built, it can be safely rebuilt so that only the generated bits are changed (this is accomplished by maintaining a clean separation between generated and hand edited files, and by config options in the bigtop file).
Notice that nothing in the above has committed you or me to any particular web application framework, data modeling scheme, templating system, or web server. Bigtop is neutral (think big tent), at least for Perl apps delivered via the web.

IPTables-tutorials aim is to explain iptables in a complete and simple way. The iptables-tutorial is currently rather stable, and contains information on all the currently available matches and targets (in kernel), as well as a couple of complete example scripts and explanations. It contains a complete section on iptables syntax, as well as other interesting commands such as iptables-save and iptables-restore.

The tutorial has recently been under heavy scrutiny and updating, as can be seen in this, the latest version of the tutorial. It is now also available in bookform from Lulu.com. If you feel like contributing or donating to the author of this tutorial, please do buy the book! Thank you!

If you need help, you are better off by asking the netfilter mailing list which you can reach at netfilter at lists.netfilter.org. For more information on this, visit the netfilter mailinglist page. You may also contact the linuxsecurity mailing list at security-discuss AT linuxsecurity dotcom. Both are fairly large, and should be able to help you much much better than I can.

Test::LectroTest::Tutorial is a Perl module that contains documentation on how to use LectroTest to test your software.

SYNOPSIS

LectroTest is an automated, specification-based testing system. To use it, declare properties that specify the expected behavior of your software. Then invoke LectroTest to test whether those properties hold.

LectroTest does this by running repeated random trials against your software. If LectroTest finds that a property doesnt hold, it emits the counterexample that "broke" your software. You can then plug the counterexample into your software to debug the problem. (Its also a good idea to add the counterexample to your list of regression tests.)

Think of your softwares behavior as a haystack that youre searching for needles. Each error is a needle. You want to find the needles and remove of them. LectroTest will search the haystack for you -- its nice that way -- but first you must tell it about the shape of the haystack and how to recognize a needle when it sees one.

The Haystack

The shape of the haystack is defined by a set of "generator bindings," in which variables are bound to the output of value generators:

x = 0;

The above asserts for each point in the haystack that the output of the function the_thing_we_are_testing must be non-negative.

Put them together to make a Property

The generator bindings and needle recognizer are combined to make a property:

Property {
##[ x = 0;
}, name => "the_thing_we_are_testing(...) is non-negative";

Youll note that we also added a meaningful name. Although not strictly required, its an excellent practice that makes life easier. (Youll also note that we placed the generator bindings inside of the magic delimiters ##[ ]##. This tells Perl that our bindings are bindings and not regular Perl code.)

We can read the above property like so: "For all integers x and all characters c in the range A through Z, we assert that the_thing_we_are_testing is non-negative."

Testing whether your Properties hold

After you define properties for your software, just add them to a small Perl program that uses the Test::LectroTest module:

# MyProperties.l.t

use MyModule; # provides the_thing_we_are_testing
use Test::LectroTest;

Property {
##[ x = 0;
}, name => "the_thing_we_are_testing(...) is non-negative";

Then you can test your properties simply by running the program:

$ perl MyProperties.l.t

If your properties check out, youll see something like this:

1..1
ok 1 - the_thing_we_are_testing(...) is non-negative (1000 attempts)

If something goes wrong, however, LectroTest will tell you where it happened:

1..1
not ok 1 - the_thing_we_are_testing(...) is non-negative
falsified in 23 attempts
# Counterexample:
# $x = 4
# $c = "R"

What this says is that at the point (x=4, c="R") in the haystack, there is a needle (i.e., your property doesnt hold). With this information, you can examine your code to determine the cause of the error.