Archive on BadproG

PostgreSQL - Setting up - Linux Ubuntu

Sat, 07 Jan 2023 00:00:00 +0000

PostgreSQL is one of the most known and used SQL server.

We’re going to see how to install it on a Linux opearting system, to be precise on Linux Ubuntu.

First of all

For this tutorial, our Linux distribution will be Ubuntu 22.04: https://ubuntu.com/

Then PostgreSQL 14.5: https://www.postgresql.org/

As a bonus we’ll use pgAdmin 4 v6.15 to manage PostgreSQL as a GUI: https://www.pgadmin.org/

Let’s get started

To install PostgreSQL on Ubuntu, just follow the documentation.

Android - API - Creating a Spinner with colors as choices

Sun, 22 Mar 2020 00:00:00 +0000

With Android we haven’t a classic ComboBox like in other frameworks but we have instead a Spinner.

Actually it’s exactly the same and only the name differs.

In this Android Spinner tutorial we’re going to create our own cutom Spinner by replacing classic texts with squares of color.

First of all

The minimum SDK for this tutorial is the API 14 (Android 4.0 or also known as IceCreamSandwich).

Spinner, Object class and 2’s complement will be see in this example.

Android - API - Creating a GridView

Sun, 17 Dec 2017 00:00:00 +0000

The GridView is a bit like the ListView’s sibling.

A lot of concepts are shared with those similar components.

We’re going to see how to create an easy GridView with almost the same code as the ListView tutorial but with some differences.

Let’s get started.

First of all

The GridView is often used to displays images as in a portfolio.

But in our tutorial we will use Strings and Integers because they are easier to use.

Android - API - Creating a ListView

Sat, 16 Dec 2017 00:00:00 +0000

The ListView is certainly one of the most used components by Android programmers in their applications.

Why? Because the concept is easy to understand and the result looks nice.

But a lot of tutorials are made with complicated ListView examples.

In this tutorial we are going to see how to use it in the most easy way.

First of all

We will display 2 ListViews, one with Strings and the other one with Integers.

Android - API - Classic methods during a life cycle with one activity

Sun, 21 Aug 2016 00:00:00 +0000

In this tutorial we will see how and when Activity main methods are called during a classic life cycle.

Only one activity will be used in this example in order to have something easy to understand.

Let’s see that.

First of all

During this video, I launched the application then I clicked on the home button to pause it.

After I clicked the application again from the list and it came back with the methods called.

Android - API - Life cycle of 2 activities with the Intent class

Sun, 21 Aug 2016 00:00:00 +0000

One important step in Android development is to understand how to deal with many activities.

This is what we are going to see in this Activity tutorial with an example of the famous Intent class.

Stop talking, let’s get coded.

First of all

In the video you can see, in orange, the MainActivity and, in green, the Activity_2.

The title also changes with the corresponding activity.

To go to the second activity, I push the Button “GO TO ACTIVITY 2”.

Android - API - Getting the current method name with StackTraceElement

Sat, 20 Aug 2016 00:00:00 +0000

Always dreamed to see the stack without your debugger?

Maybe this tutorial will help you with the StackTraceElement Java class.

Of course we are going to use an Android application to see all that on our screen!

Let’s get started.

First of all

I’ve created a while loop in order to use every element in the stack until the last one.

A special classe has been created (BadprogHelper) in order to use a specific method to have a delay between each element.

Android - Tips'n Tricks - Hiding/Showing the Notification bar

Tue, 16 Aug 2016 00:00:00 +0000

Maybe you don’t know that but it’s possible to remove the Notification bar programmatically.

It’s quite useful if you don’t really need it for your custom application.

It takes a little bit portion of your screen but why let it?

Let’s see that in this Notification bar tutorial.

First of all

We’re going to create a Button to hide and display the NotificationBar.

Each time you click the Button, the state changes by toggling the features of this Button.

Android - Android Studio - Generating an unsigned release .apk

Mon, 15 Jun 2015 00:00:00 +0000

If you come from the Eclipse world, you should be lost because it’s not very clear how to generate a release build version of an .apk file.

In this Android Studio tutorial, we are thus going to see how to resolve this release build generation.

Generating the debug build .apk

First of all, click > Build > Make Project.

Then > Run > Run nameOfYourApp.

Your project should be built and of course in the debug version.

Android - SQLite - Basics

Wed, 17 Jul 2013 00:00:00 +0000

A classic way to deal with database, with Android, it’s to use the SQLite classes.

What’s unique in SQLite is that you don’t need a server where running your database.
Indeed, everything is already inside your Android application.

And of course impossible to another application to read this database.

Let’s have a look in this Android SQLite tutorial to learn basics with an example.
A bit like an Hello World SQLite.

Android - API Google Maps - Using MapType

Sun, 07 Jul 2013 00:00:00 +0000

I think the MapType is certainly the most fascinating feature of GoogleMaps and also one of the most easy to understand and make alive in an Android application.

With one click it’s possible to change the display of the map such as hybrid, none, normal, satellite or terrain.

And this is exactly what we are going to see in this Android Tutorial 5.

Explanation

The setMapType() method is the key of this feature.

Android - API Google Maps - Using Google Maps API v2

Sat, 15 Jun 2013 00:00:00 +0000

Google made a new version of its famous Google Maps API, called Google Maps API v2.

Things are new, such as the OpenGL ES version 2.

But let’s try to create an application, in this Google Maps API v2 tutorial for Windows 7 and less or more.

Google Play Services library

Your Android SDK Manager has to be updated.

Especially you need to install or update: Extras > Google Play Services.

Oracle - VirtualBox - A better resolution with a guest Ubuntu

Sun, 02 Jun 2013 00:00:00 +0000

By installing a Ubuntu guest with VirtualBox on Windows, you likely found a basic resolution, such as 1024*768.

Unfortunately, you have a screen with a 1920*1200 resolution, it’s impossible to let this like that.

There is of course a solution to increase this basic setup, but with a maximum of 1440*1050.

Better than nothing.

Let’s do it.

What to do?

Open a Terminal and write it down this line:

sudo apt-get install virtualbox-guest-x11

Restart your Linux, and you’re done.

Android - Installation - On Linux Ubuntu 64-bit with a 32-bit ADT version

Sun, 20 Jan 2013 00:00:00 +0000

You can easily use the following Windows Android setup tutorial to install the Android Development Tools on your Linux system except that you will need the 32-bit libraries and install a JDK.

Note that all these things, could be done by simply download a bundle especially made by Google.

The 32-bit libraries

So open your favorite shell and type this:

sudo apt-get install ia32-libs

A huge list of libraries will be available. Select all and continue.

Eclipse - Arduino - Installation

Sun, 20 Jan 2013 00:00:00 +0000

You would like to program with Arduino but you can’t do this with the Arduino Software provided.

Instead you would prefer to use your favorite IDE: Eclipse.

That’s what we’re going to see in this Eclipse and Arduino setup tutorial from scratch.

We are going to see settings for the Arduino ADK ATmega 2560 and the Arduino Uno.

Installation on Linux Ubuntu

What we need

Linux Ubuntu 12.04
The avr-gcc compiler
Openjdk, the open source version of the JDK (Java Development Kit)
Eclipse Juno CDT (or JavaEE)
Arduino library

Java

We need the JDK and we will use the open source version. I invite you to install the version 6 (and not the 7) due to security issues in the seventh one.

Perl - OOP - Creating classes with methods

Thu, 18 Oct 2012 00:00:00 +0000

As every language, OOP is a plus. And who says OOP, says classes and methods.

Perl is able to manage such of things. That’s what we are going to see in this Perl tutorial.

Let’s create classes and their methods.

Explanation

Our Perl program will show us who is the boss and who is the employee. And who the boss is hiring.

In Perl, a class is called a Package.
The name of the package is the same as the file name.
Its extension is ".pm".

Perl - Native functions - Using print()

Thu, 11 Oct 2012 00:00:00 +0000

The Perl print() function is used to display a string.

In our example, we are going to display the content of two variables previously declared and initialized.

So, let’s go to our first Perl HelloWorld! tutorial!

Explanation

We have to create a file named helloWorld.pl because we will use this file with the perl command.

All comments are beginning by a sharp (#).

The code is quite easy, we have two pragmas (strict and warnings).

Oracle - VirtualBox - Installation

Mon, 24 Sep 2012 00:00:00 +0000

VirtualBox is a virtualization manager that enables to add different OS on other OS.

Let’s admit you have a PC with Windows 7 installed. In the past, if you wanted to have a Linux, you were obliged to install it like any OS with a DVD and boot on it.

And then, reboot each time you wanted to use one of them.

Now, with virtualization, you just have to download a software and while you are still on an OS you can install another one, without rebooting your machine!

Eclipse - Debugger - An easy example

Sat, 02 Jun 2012 00:00:00 +0000

Using the debugger is just essantial in a huge complex project.

But even for a tiny program, it is also useful.

For this Eclipse debugguer tutorial we are going to test it with the C++ programming language.

Of course you know how to install Eclipse on Windows, if not, follow this Eclipse installation tutorial for Windows.
If you prefer GNU/Linux or MAC it is a bit much easy because all libraries are already installed on your OS.

Eclipse - Errors - While coding

Thu, 08 Mar 2012 00:00:00 +0000

This section will gather all errors found when you were coding in Eclipse.
It is really hard sometimes to find what is the problem when you get an exception.

I will also give a solution of the problem.

Error 1. java.lang.ArrayIndexOutOfBoundsException

I had a hard reboot and when I came back to Eclipse (it was opened during this reboot), completion didn’t work anymore.
I trying some stuff, but nothing.
Finally I erased the .metadata directory included in all projects generated by Eclipse.
I know it is a bit radical, but it works. 😜

OCaml - List - Creating a list

Wed, 29 Feb 2012 00:00:00 +0000

As all programming languages, it is possible to create lists in OCaml.

So, let’s see this, right now with new examples.
We will indeed create two functions, one of ints and another of strings.

For the ints:

#let number = [1; 2; 3; 4];;

For the strings:

#let fruits = ["apricot"; "raspberry"; "cherry"; "tomato"];;

As you can see, there is no need to tell to the interpreter the type of elements in the list.
It’s automatic! 😊

OCaml - List - Iterating through a list and displaying all elements inside

Wed, 29 Feb 2012 00:00:00 +0000

As you already saw it, creating a list in OCaml is not so difficult.
But this time, we will see how to iterate through a list and display all elements inside.

We will create two arrays, one of ints, the other of strings.
Once done, we will display their elements.
Let’s see it with this OCaml list tutorial.

Creating lists

List of ints:

#let number = [1; 2; 3; 4];;

List of strings:

OCaml - Function - Creating a getter to retrieve an element of a tuple

Tue, 28 Feb 2012 00:00:00 +0000

OK, this is not really a getter implementation like we can have it in other object-oriented programming, but it is close of it.

We have first to create an human variable with a tuple (“name”, age).
Then we have to create two getter functions to retrieve the first and the second parameter of this human variable.

Let’s begin by the human variable:

# let human = ("John", 50);;
val human : string * int = ("John", 50)

Let’s continue by the getName function:

OCaml - Function - Creating an easy function

Tue, 28 Feb 2012 00:00:00 +0000

In this tutorial we will see how to create a function in OCaml language.
It will be an easy function to understand how it works.

We will create a function that returns an int + 1.
Here the code:

# let myFunc myVar = myVar + 1;;

Notice that you can also create a function like this:

# let myFunc = fun myVar -> myVar + 1;;

Press enter, it will display:

val myFunc : int -> int =

OCaml - Function - Using recursion

Tue, 28 Feb 2012 00:00:00 +0000

OCaml is a fully recursive language. So using recursion is completely natural.
We will see in this example how to create an easy recursion of a classic factorial. This in two different manners.
These two ways of using recursion are strictely the same, the type of the function and the result as well of course.

The first manner to create a recursion function

# let rec factorial n = if n = 0 then 1 else n * factorial(n - 1);;

You can split it to have a better indentation:

OCaml - Utilities - Using the rlwrap command

Mon, 27 Feb 2012 00:00:00 +0000

When you use OCaml on Linux for example, you cannot by default using the arrow from your keyboard, neither the completion.
If you try to use them you will have something like that:

# ^[[A^[[D^[[C^[[B^[[D^[[A^[[C^[[D^[[B^[[C

But there is readline wrapper named rlwrap that will help us in this task!

Just write it before starting your OCaml interpreter, like this:

$ rlwrap ocaml

Thus your arrows will work and completion too.

OCaml - Variable - Creating variables

Mon, 27 Feb 2012 00:00:00 +0000

For creating variables in OCaml we need to use the let keyword.

The syntax to create a variable is the following:

# let myVar = 90;;

When you type enter, it will be displayed the type of your variable:

val myVar : int = 90

The OCaml interpreter will find the type by itself.
This mechanism is called the inference. 😊

Android - MediaPlayer - Example of playing sounds

Fri, 23 Dec 2011 00:00:00 +0000

Maybe you are wondering how to play a MP3 sound by clicking a simple Button on Android.

Eh, you know what? You are in the right place!

Note that this tutorial for MP3 sounds works as well with MP3 musics and of course a lot of different types of format such as WAVE or MIDI.

A complete list can be found on the official website of Android developpers:
http://developer.android.com/guide/appendix/media-formats.html.

After a presention of which MP3 we will need, we will show the source code needed for this tutorial.

Apache - Ant - Errors

Thu, 08 Dec 2011 00:00:00 +0000

You were compiling on Windows 7 when suddenly you are getting this error:

[ERROR] com.sun.tools.javac.Main is not on the classpath.
[ERROR] Perhaps JAVA_HOME does not point to the JDK.

Then maybe something like that:

[ERROR] It is currently set to "C:\soft\java32\jdk1.7.0\jre"

So the JRE instead of the JDK?
What’s going on?

Ant needs a file named tools.jar that it searches in the JRE but this file is in the JDK!

Apache - Continuum - Configuration

Wed, 30 Nov 2011 00:00:00 +0000

After installing Apache Continuum continuous integration tool, you may want to configure it and of course, build your first project with Maven and Continuum.
But you already have a project on SVN, and you wish to use it as well.

No problem you are in the right place.

Software used in this tutorial:

Apache Maven 3
Apache Continuum 1.4.0
Subversion 1.7

Configuration of Continuum with Maven and SVN on Windows

Prerequisites

If you don’t have a project built with Maven, I suggest to follow this tutorial of “What is Maven?”.

Apache - Continuum - Installation

Wed, 30 Nov 2011 00:00:00 +0000

Apache Continuum is a continuous integration tool.

You can download a copy on the official webpage of Apache Continuum:http://continuum.apache.org/

Or with one of mirrors with this Apache mirrors’ page: http://www.apache.org/dyn/closer.cgi

Installation of Apache Continuum on Windows

We will take the apache-continuum-1.4.0-bin.zip version.

It will be installed by the console with the JVM.
And of course, you need a JDK, who do not have it?

I extracted all files, from the .ZIP, in this directory:
C:\soft\apache\continuum-1.4.0.

Apache - Maven - What is Maven?

Tue, 29 Nov 2011 00:00:00 +0000

Maven is a tool, mainly developed for Java developments.
This is a complete software so it is not so easy to understand when you start developing, even with the official website of Maven: http://maven.apache.org/.

But I will try to reduce the explanation of what is Maven with some examples.

You can start by following this tiny installation tutorial of Maven for Windows.

OK, let’s see in details what Maven is.
First of all, every project with Maven has a pom.xml file.
POM means Project Object Model.
With this XML file, a team manager can configure a project and how Maven will interact with this project.
It means that if a project contains subprojects, we will have more than one pom.xml.
In fact, one for each project.
The POM into sub projects will inherite from the Super POM and so on for others child projects.

Apache - Archiva - Installation

Mon, 28 Nov 2011 00:00:00 +0000

To download the last stable Archiva release, let’s go on the official website: http://archiva.apache.org/

For this Archiva installation tutorial, we will install the Archiva 1.3.5 Standalone version.

Do not hesitate to test the MD5 checksum.

Installation of Archiva on Windows

OK, extract the files into a directory, I chose this one:
C:\soft\artefact-manager\apache-archiva-1.3.5.

Now open this file:
C:\soft\artefact-manager\apache-archiva-1.3.5\conf\jetty.xml.
And go until the line 66.

You will have something like that:

Just change the 8080 by 8082.
You are probably wondering why?
This is because the default port, in our case 8080, is often already taken by another device or software.
So to be sure it works, we change this for 8082.

Eclipse - CppUnit - Installation

Wed, 23 Nov 2011 00:00:00 +0000

It is a bit complex to know how to install CppUnit and how to use it with Eclipse.

That’s why I make this tutorial about CppUnit and Eclipse.
I hope it will be easy enough even for beginners, if not, do not hesitate to post a comment, I will help if I can.

This installation will be done on Windows OS, I am sure if you are a Linux addict or a Mac fan, this explanation will help you as well.

Eclipse - Tips'n Tricks - Adding flags to the GCC compiler

Sat, 19 Nov 2011 00:00:00 +0000

You may want to add some commands to your GCC flag settings.

No problem, Eclipse can allow you this.

Right click on your project > Properties > C/C++ Build > Settings > Tool Settings > GCC C++ Compiler > Miscellaneous.
On the right, there is an input with the name Other flags.
Enter your command there.

For example, if when you compiling you have this error:

deprecated conversion from string constant to ‘char’ [-Wwrite-strings]*

You can add this command to remove it:

Eclipse - Java - Source attachment

Mon, 14 Nov 2011 00:00:00 +0000

It’s really annoying when you want to browse throw a javadoc but Eclipse doesn’t know where to find these sources.

The more difficult thing is to find these source files.

But with the JDK7 it is now easy.
Go until your directory where you have installed it.
For example, let’s assume it is C:/soft/java32/jdk1.7.0.
You will find a src.zip file.

This is the file to open all classes present in your, for example, rt.jar file.

Eclipse - JUnit - Installation

Mon, 14 Nov 2011 00:00:00 +0000

It’s time for you to play with Unit testing, especially with JUnit.

OK, let’s see how to install it on Eclipse.

First of all, you need a version of JUnit.
Let’s go on the official website to download it: http://www.junit.org/

In the last version, for our example, the junit4.10 one.

Open the .zip. Inside there is a junit-4.10.jar file.

In Eclipse, select a project then > Project > Properties > Java Build Path > Libraries tab > Add Jars > Select the junit-4.10.jar > OK

Eclipse - SDL (Simple Directmedia Layer) - Installation

Fri, 11 Nov 2011 00:00:00 +0000

You like C and C++ but you need some help to access audio, joystick, keyboard, video framebuffer, etc.
That’s why you would like to use the SDL library.

But, there is still a problem, you don’t know how to install it with Eclipse.

OK, let’s try it with this tutorial installation.

1. Installation of SDL with Eclipse on Windows

A. Outside Eclipse

We assume that you have already installed MinGW in this directory: C:\soft\mingw.

Apache - Maven - Installation

Tue, 08 Nov 2011 00:00:00 +0000

Maven is a great tool that can really help you to manage a project.
Its main goal is to building projects, publishing project information and a sharing JARs across several projects.

We will see, in this tutorial, the installation of Maven 3 on Windows.

Installation of Maven 3 on Windows operating system

Let’s first download the latest version from the official website of Apache Maven: http://maven.apache.org/download.html

Then extract files in the directory of your choice.
For our example, we will assume this one: C:\soft\apache\maven-3

UML - Diagram class - Relationships

Wed, 26 Oct 2011 00:00:00 +0000

This is not so easy to know which relationships and graphic to use to describe a situation.
But what we know for sure, is that the classes are linked.

Let’s see this in details.

Association

An association is graphically represented by a simple line.
This is a weak link between two or more classes.
For example a customer can make an order.
In this case, the customer is linked by this order, and the order as well by the customer.

Eclipse - Tips'n tricks - Open Element

Tue, 25 Oct 2011 00:00:00 +0000

This Open Element option allows to find a specific element in a project with the beginning of its name.

For that, open a class and type SHIFT + CTRL + T and a popup will open to find the correct element of your dreams.

Very useful.

Eclipse - Standard Widget Toolkit (SWT) - Installation

Fri, 21 Oct 2011 00:00:00 +0000

SWT, the Standard Widget Toolkit, will help us to draw windows for the Java platform.

On this webpage you will find links to download last stable releases http://www.eclipse.org/swt/

Once downloaded, open Eclipse, right click on the Explorer tab, then : Import… > General > Existing Projects into Workspace.
Click Next then select the Select archive file option and browse until, for example for Windows OS, your swt-3.7.1-win32-win32-x86.zip file.

Click Finish.

Now in your Package Explorer you can see the org.eclipse.swt project.

Eclipse - Tips'n tricks - Open Type

Fri, 21 Oct 2011 00:00:00 +0000

This Open Type option allows to find a specific class in a project with the beginning of its name.

For that, use the SHIFT + CTRL + H and a popup will open in front of your eyes.
Start writing and all types with matching name will appear.

😭

Eclipse - Qt Framework - Installation

Tue, 18 Oct 2011 00:00:00 +0000

You like Qt framework and you like Eclipse as well.
So you already developed with Qt Creator, but your favorite IDE is missing you.

I understand.

That’s why I will show you how to use Eclipse to compile a project with Qt framework.

1. Using Eclipse and Qt framework on Windows OS

A. Qt for open source C++ development on Windows

Let’s start by install the open source Qt libraries.
I suggest you to downlod the .exe with this link: http://qt.nokia.com/downloads/windows-cpp

Eclipse - Tips'n tricks - Creating a Code Style

Tue, 11 Oct 2011 00:00:00 +0000

You can easily manage the Code Style of your pages in Eclipse.

For example, for C++ (this is exactly the same for all others languages), simply do this:

Window > Preferences > C/C++ > Code Style.

Under classic built-in choices, click New… and create your own Code Style!

Yeah!

Eclipse - Tips'n tricks - Generating getters and setters from the Source menu

Tue, 11 Oct 2011 00:00:00 +0000

An easy way to generate getters and setters is to use the Source option within Eclipse Indigo.

For example, create a new file, add the following lines and select them:

int nbPeople;
int nbAnimal;

Then right click.
On the menu select Source > Generate getters and setters.
On the new window, click on the right Select All, then Next and Finish.

Your getters and setters are generated for you as follows:

Apache - Ant - Installation

Tue, 04 Oct 2011 00:00:00 +0000

Ant is a Java tool that can help you building projects and setting them correctly.
It can generates files and directory from simple XML files.
So, let’s get started with this tutorial of Apache Ant on Windows operating system.

1. Apache Ant installation on Windows

So, we will install Ant on Windows and for that we will use in this tutorial:

Windows 7
Ant 1.8.2

Two things are important, the path for the directory and the path for the environment variables.

Oracle - GlassFish Server Open Source Edition - Installation

Tue, 04 Oct 2011 00:00:00 +0000

A new tutorial to explain how to install the Oracle GlassFish server Open Source Edition 3.1.1 on Windows directly by running it and with the Eclipse IDE.

1. Installation on Windows by running it

Let’s start by download it on the official website: http://glassfish.java.net/

Once downloaded, run it.
Choose: Custom Installation > Next > Install and Configure > Next > Select a directory > Next > Select your Java SDK folder > Next > Check Install Update Tool and Enable Update Tool > Install

Security - Checksum - MD5

Tue, 04 Oct 2011 00:00:00 +0000

You just download a new file and you want to know if this file is really the good one.

How to do that?

With checksum of course!

Of course, this is not a 100% secure way, but it is better than nothing!

Why it is not a perfect secure way?
Because someone may have hacked the website where is the file to download, and generate the checksum of its own hacked file.
So if you try to check this checksum, you will have exactly the same, but the file will be hacked.
But as I said, this is better than nothing!

Eclipse - Subversion - Installing SVN on Windows

Sun, 02 Oct 2011 00:00:00 +0000

You already have Eclipse Indigo, but you want more. That is a good thing.
Indeed, you want be able to connect your projects with a software versioning and a revision control system, and this directly from Eclipse.

You need SVN!

Open Eclipse:

Help > Eclipse Market Place… > Write Subclipse in the Find input area.

Click Install on the right of the Subclipse details.

Accept all and restart Eclipse.

If you have a 64 bits Java Virtual Machine, you must download the JavaHL for 64 bits.
Here the website: http://www.sliksvn.com/en/download

Apache - Tomcat - Installation

Sun, 25 Sep 2011 00:00:00 +0000

Today a new tutorial for installing Tomcat 7 on Windows 7.
You must have, at least, the JRE 6.

Apache Tomcat installation on Windows 7

Let’s get started by downloading the last version on the official Apache Tomcat website:

http://tomcat.apache.org/

Choose the 32-bit/64-bit Windows Service Installer.

Run it and in the Choose Components choices, select the type of install Full in the combo box.
Click Next and in Configuration, let all ports by default.
In the Tomcat Administrator Login set a User Name and a Password if you want, or let it empty.
Then Next > Next > Install.

Symfony 2 - Installation - On Windows Operating System

Sat, 24 Sep 2011 00:00:00 +0000

You already played with Symfony 1 or you never used it (SHAME ON YOU), and you want to install a fresh new 2.0.1 version of Symfony2 on Windows 7.

You are in the right place!

To be honest this new version is really easy to install.

Download a copy on the official website of Symfony2: http://symfony.com/download

We will install the 2.0.1 in the ZIP format.

Symply open the ZIP file and place all in the root of your web server, generally it is C:\www.

Android - Error - DeviceMonitor

Fri, 16 Sep 2011 00:00:00 +0000

The following error occurs when you try to restart your Android Virtual Device too quickly during another launch, with the Run command of Eclipse:

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
Error during Sync: timeout.
Adb connection Error:An existing connection was forcibly closed by the remote host
Connection attempts: 1
Connection attempts: 2
Connection attempts: 3
Connection attempts: 4
Connection attempts: 5

To resolve it, close your ADV and restart your application. 😜

Android - Error - ActivityManager

Thu, 15 Sep 2011 00:00:00 +0000

There, errors took from the ActivityManager within the Eclipse Console for the Android plugin and of course some explanations.

1. Error 1

1.1. The console text

ActivityManager: Starting: Intent
{
act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.badprog/.Tutorial
}
ActivityManager: Warning: Activity not started, its current task has been brought to the front

1.2. The solution

This error occurs when you run your application without modifying anything before.
To remove it, just add a space in your code and save it.
Restart your application and this error should have gone. 😊

Android - Tips'n Tricks - Creating components

Thu, 15 Sep 2011 00:00:00 +0000

Today I will show you how to create 3 Buttons with 3 different ways and how to display them on the layout.

It will be the Tuto 3 that can be found on the Android Market for free, of course.

First of all, let’s explain what we will do.
We want to display 3 Buttons.
For this example, I will use BadprogTutorial instead of the complete one I used to create the application (Tuto_3_BadprogTutorialCreatingComponentsActivity).

Android - API Google Maps - Using MapView

Fri, 09 Sep 2011 00:00:00 +0000

This is the Tuto 2 of the Android tutorial series. You can find the application made here on the Android Market.
Just follow the link on your right.

The MapView class of the Android Google Maps API is designed to display a map with data obtained from the Google Maps services.
If you never created a Google Maps application on Android, and for a full description and files needed, take a look at this tutorial:

Android - Application - Using Google Maps

Thu, 08 Sep 2011 00:00:00 +0000

As the Google Maps API v1 is now obsolete, I could recommend to check this tutorial for the new version of Google Maps API v2.

This Tuto 1 could be found on the Android Market and the direct link is on your right, in the menu.

The Android API allows us to use the Google Maps library.

So, in this tutorial, for beginners, we will create a first application with some examples of the Google Maps.

Android - API - CharSequence

Wed, 07 Sep 2011 00:00:00 +0000

CharSequence is a native Java Interface.
Its path in the package is android.content.Context.getText(resId)
The class Context extends Object.
We will see this with an Hello World! example.

1. CharSequence getText()

The Android API uses it to create a getText method.

Let’s take an example.

The Java class:

// src/com.badprog.mobile/BadprogActivity.java
package com.badprog.mobile;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class BadprogActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TextView tv = new TextView(this);
CharSequence myString = getText(R.string.hello_world_smile);
tv.setText(myString);
setContentView(tv);
}
}

Then the XML file:

Android - API - Activity

Sun, 04 Sep 2011 00:00:00 +0000

Each Android application has one or more Activities.
Each Activity has a lifecycle.
Each screen we want to use as an interactive component is an Activity.
So this application component must extends the Activity class.
Interactive component is a component that the user uses to do something, for example, send an email, take a photo, etc.

1. Lifecycle of an Activity

There is below their fundamental methods:

public class ExampleActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// The activity is being created.
}
@Override
protected void onStart() {
super.onStart();
// The activity is about to become visible.
}
@Override
protected void onResume() {
super.onResume();
// The activity has become visible (it is now "resumed").
}
@Override
protected void onPause() {
super.onPause();
// Another activity is taking focus (this activity is about to be "paused").
}
@Override
protected void onStop() {
super.onStop();
// The activity is no longer visible (it is now "stopped")
}
@Override
protected void onDestroy() {
super.onDestroy();
// The activity is about to be destroyed.
}
}

So an activity may be used in interaction with several activities.
When an activity starts another one, the first is always in the stack (the back stack).
The second one may send data to the first with, for example, a return value and after the end of the second one, the first activity receives this data to use it.

Android - Application - First application for beginners with an Hello World tutorial

Sun, 04 Sep 2011 00:00:00 +0000

Let’s play a bit with Android and create our first application, in this tutorial for beginners.
We can call this tutorial: Tuto 0.
You could find it on the Android Market.

Open Eclipse.

On the Package Explorer, right click and select:

New > Other > Android > Android Project > Next.

Write the Project Name: HelloWorld.

On the Build Target area, select the version of Android you would like to use.
We are selecting the Android 3.2 one for this example.

Android - Installation - On Windows OS and Eclipse

Sat, 03 Sep 2011 00:00:00 +0000

Let’s get started with the installation of Android on Windows 7.

First of all, you must have a JDK (Java Development Kit) on your OS, the version 6 is the most secure one, so I recommand it.
If you do not have one, let’s download it on the official website of Oracle:
http://www.oracle.com/technetwork/java/javase/downloads/index.html

Then download the Android SDK (Software Development Kit) on the official website of Android:
http://developer.android.com/sdk/index.html

Once installed on your computer, launch the SDK Manager on the Android SDK directory if it does not start automatically.
On the left panel, select the Available packages and select all packages you want.
Then click Install Selected > Accept All.

Eclipse - Python - Installation of PyDev with a Python Hello World tutorial

Fri, 02 Sep 2011 00:00:00 +0000

Once you finished your installation of Python on your Windows OS, GNU/Linux or Mac OS, let me tell you how to install it on your favorite IDE, Eclipse.

First of all, you have to download Eclipse on the official website. I suggest you to choose the JavaScript version.

Let’s go.
Open Eclipse then:

Help > Eclipse Marketplace.
On the Find input, type PyDev and click the search icon.

PyDev - Python IDE for Eclipse appears.
Click the Install button on the right.

Symfony 1 - Helper - UrlHelper

Sun, 14 Aug 2011 00:00:00 +0000

Symfony UrlHelpers add some features to the URL management.

In this Symfony UrlHelpers tutorial, we will see how to use them with some examples.

Let’s start with the link_to UrlHelper:

php echo link_to(    'My page',
                    'level/index',
                    array('confirm' = 'go?',
                        'absolute' => true,
                        'query_string' => 'foo=32',
                        'anchor' => 'hello',
                        'post' => true,
                    ));
?>

This PHP code will produce this HTML one:

[My page](http://myproject/frontend_dev.php/level?foo=32#hello)

It will ask you if you accept to continue or not.
You have to use the right syntax such as “module/action”, otherwise this will not work correctly.
As you can see, it will create a lot of JavaScript code.
You will have less code if you remove the post option and will can add the popup option and set it to true to open a new window when clicking.

Symfony 1 - Routing - Creating a URL with dashes (manually)

Tue, 09 Aug 2011 00:00:00 +0000

A great way to display URLs is to using dashes.

Indeed, it is always better for an human being to see a reading URL instead of a succession of symbols.

That is what we will see in this Symfony 1 tutorial about routing.

Let’s take an example.
We want to create a module that represents a tutorial for beginners.

Our application is named Badprog.
Our model might be called : BadprogBeginnerTutorial.
So the module might be called : beginnnertutorial.

Symfony 1 - Security - Authentication

Mon, 01 Aug 2011 00:00:00 +0000

Symfony 1 uses the YAML files to secure the application.

For example, in this tutorial, we can see with the backend side how to secure the entire application.
But we can also secure only the index of a module or all others webpages excepted the index.
This, with an authenfication.

By default, in your backend side, you have a security.yml file:

// apps/backend/config/security.yml
default:
is_secure: false

Change the boolean false into true and save it.

PHP 5 - PEAR - Installation

Sun, 31 Jul 2011 00:00:00 +0000

In this tutorial, we will see how to install PEAR with PHP 5 on Windows 7.

We, of course, assume that you already installed PHP.

For example, the PHP path installation is:

C:\Program Files (x86)\PHP\php-5

Inside there is a file named:

go-pear.bat

Double click it.

A black window appears asking you what installation do you prefer.

Write:

system

A suggestion appears asking you if the default directories for the PEAR installation.

Symfony 1 - Test Unit - With Doctrine and a database

Sun, 31 Jul 2011 00:00:00 +0000

In this test unit tutorial of the Symfony 1 framework, we will take examples to show how it works with Doctrine and a database.

First of all, you have to set up a database to test and create some fixtures.
If you have not done it yet, take a look at this tutorial:

Then we can create a special database for tests.

For this new test database, we can either copy/paste all fixture files from /data/fixtures/* in /test/fixtures/* or use directly the fixtures of the /data/fixtures/*.

PHP 5 - Installation - On Windows

Wed, 27 Jul 2011 00:00:00 +0000

I made a tutorial with examples for the installation of Apache HTTP, PHP, MySQL, phpMyAdmin and some virtual host explanations, for Windows.

You can find this tutorial by following this link:

Enjoy

Symfony 1 - Routing - Creating a basic route

Thu, 21 Jul 2011 00:00:00 +0000

In this tutorial of the Symfony 1 framework, we will see how to create a new easy basic route.

The url_for() method will help us to create this routing.
In the layout, let’s first add a link to our new page, called BapdroG and its corresponding route, called routingBadprog.

// frontend/templates/layout.php- [BadproG](<?php echo url_for('routingBadprog') ?>)

If you try to refresh your webpage, you will have a 500 error, saying that the route “routingBadprog” does not exist.

Eclipse - Indigo - PHP installation with PHP Development Tools (PDT)

Sun, 17 Jul 2011 00:00:00 +0000

With the last Eclipse version, Indigo, there is no special IDE for PHP.
So you have either to install the Helios PDT version or install Indigo and then install PDT.

I love innovation, so I will show you how to install, in this tutorial, the new Indigo version and then PDT within.

First of all, download the Indigo Eclipse version on the official website: http://www.eclipse.org

Ckick Download and choose the right version you want. I suggest you the Eclipse IDE for JavaScript Web Developers.
Once downloaded and installed, open Eclipse and click:

Symfony 1 - MVC - How does it work?

Sun, 17 Jul 2011 00:00:00 +0000

In this tutorial I will show you how the symfony framework works with the MVC pattern.

Each application, for example the frontend, has one or several modules.

Each module has one or several Controllers and Views.

The first Controller of a module is in the actions directory and the actions.class.php file that can be found there:

symfony > apps > frontend > modules > moduleName > actions > actions.class.php

The Views in the templates directory and they are suffixed by the Success word, except for the _form file.

MySQL - Installation - On Windows

Wed, 13 Jul 2011 00:00:00 +0000

I made a tutorial with examples for the installation of Apache HTTP, PHP, MySQL, phpMyAdmin and some virtual host explanations, for Windows.

You can find this tutorial by following this link:

Enjoy

Eclipse - Explorer - Removing all .svn folders

Mon, 11 Jul 2011 00:00:00 +0000

You maybe wondering how to remove .svn folders from your Eclipse explorer.
In this tutorial we will see how to hide .svn directories.

Open your Eclipse.
Click the project name in the explorer.
Right click it.
Then:

Properties > Resource > Resource Filters

Click the Add button on the right.

Select:

Exclude all
Folders and All children (recursive)

Then write in the input:

.svn

Click OK.
Click Apply.
Click OK.

Symfony 1 - Error - SQL and Doctrine with the command line

Sun, 10 Jul 2011 00:00:00 +0000

In this page, I’m gathering all errors that I will find while playing with Symfony and SQL requests.
And of course I will bring some explanations to resolve these errors.
It will be sliced by an example of each error and with its own solution.
So, let’s start it because a problem has always a solution!

Example 1

For example you typed this in your command line:

$ php symfony doctrine:build --all --no-confirmation ; php symfony doctrine:data-load

And you have this error:

Symfony 1 - Doctrine - Set up a new database

Sat, 09 Jul 2011 00:00:00 +0000

In this tutorial we will see how to set up a database with Symfony 1 and doctrine examples.

Let’s start by writing some code in the schema.sql file.
We will create the Hello project with this hello database.

# config/doctrine/schema.yml
HelloCategory:
  actAs: { Timestampable: ~ }
  columns:
    name: { type: string(255), notnull: true, unique: true }
 
HelloBook:
  actAs: { Timestampable: ~ }
  columns:
    category_id:  { type: integer, notnull: true }
    email:        { type: string(255), notnull: true }
    expires_at:   { type: timestamp, notnull: true }
relations:
    HelloCategory: { onDelete: CASCADE, local: category_id, foreign: id, foreignAlias: HelloBooks }

We continue by typing a command line for connecting to the database.
The name of your project will be also the name of the database:

Symfony 1 - Set up - A new project

Sat, 09 Jul 2011 00:00:00 +0000

In this tutorial of Symfony 1, we will set up a project from scratch.

Let’s start it by downloading the project that you can find on the official web page of Symfony: http://www.symfony-project.org/installation

This tutorial will use the 1.4.12 version.

Once done, come back there.

Just before starting, do not forget that for Windows, you have to use a SLASH (/) and for GNU/Linux a BACKSLAH () for you PATH.
And of course, replace yourProjectName by yours.

Apache - HTTP - Installation

Wed, 06 Jul 2011 00:00:00 +0000

I made a tutorial with examples for the installation of Apache HTTP, PHP, MySQL, phpMyAdmin and some virtual host explanations, for Windows.

You can find this tutorial by following this link:

Enjoy

Apache - HTTP - Errors

Tue, 28 Jun 2011 00:00:00 +0000

If all your web installation was working fine and you do not know why now nothing is working anymore, with a beautiful error such as: “Could not connect to localhost”, let’s try this solution.

First of all, try to stop your Apache HTTP server manually.
Left click on it on your tray icon in your taskbar:

Apache 2.2 > Stop

If nothing happens, this is because your server is still running in an infinite loop.
So do not panic and wait around one minute.
Normally the server would stop.
So restart it with left click and:

phpMyAdmin - Installation - On Windows

Tue, 21 Jun 2011 00:00:00 +0000

I made a tutorial with examples for the installation of Apache HTTP, PHP, MySQL, phpMyAdmin and some virtual host explanations, for Windows.

You can find this tutorial by following this link:

Enjoy

Zend - Framework 1.11 - Using the zf command line tool

Tue, 21 Jun 2011 00:00:00 +0000

An easy way to create a new Controller is by doing this with the command line.

On Windows, open a new terminal (SHIFT + right click on your project directory) and write this:

$ TheProjectDirectory> CompletePathUntil\ZendFramework-1.11.7\bin\zf.bat create controller Menu

It will create:

A controller in /application/controller/MenuController.php
An indexAction in the MenuController file
A view script in /view/scripts/menu/index.phtml
An update for the project file: .zfproject.xml

All that in a single line.

Zend - Framework 1.11 - Using Zend_Controller

Tue, 21 Jun 2011 00:00:00 +0000

Let’s explain, with this tutorial, how this Zend_Controller works.

I added some examples in addition of the official documentation, even if most of my text is taking from the Zend documentation.

Zend_Controller_Front is the heart of this MVC framework.
It intercepts all requests and dispatches them to all adequate controllers.
Each controller has one or several action methods and each action has a view script.
It means that if we have a MenuController with a method named firstAction(), we will have the template /view/scripts/menu/first.phtml to display content of the firstAction() method.

Objective-C - Design pattern - Delegation

Wed, 06 Apr 2011 00:00:00 +0000

Delegation principle is that an object sends messages to its delegate to ask or to notify it that something is occuring.

The main example is the Application that sends messages to its delegate to tell it that the routines are ready and the custom configuration can start.

Objective-C - Design pattern - Model-View-Controller - MVC

Wed, 06 Apr 2011 00:00:00 +0000

The MVC pattern is certainly the most famous one.
It allows to dispatch the work in 3 concepts: The Model, the View and the Controller.
This concept exists in all programming languages.
So it’s easy, when you understood it, to apply your knowledge with all others languages.
That’s why this design pattern is really important for a good developer, and I am sure you are one of them.

Let’s beginning by the Controller.

PHP 5 - array() - Using is_array()

Tue, 22 Feb 2011 00:00:00 +0000

How to know if a variable is an array() or not?
Easy with the is_array() function.

Let’s see an example of the is_array() function:

php
$my = array();
if (is_array($my))
echo "This is an array().";
else
echo "This is not an array().";
?

Result:

This is an array().

Zend - Framework 1.11 - Create a new project

Sat, 19 Feb 2011 00:00:00 +0000

Dowload the Zend framework To easily create a new project with Zend framework we have to go until the bin/ directory of the framework package. 2) Once downloaded from the official website, go until this directory:

ZendFramework-1.11.3/bin/

In this directory we have the binaries for UNIX like and Windows OS, named respectively zf.sh and zf.bat. 3) Open a shell (this black screen you like so much) and write this:

$ zf.sh create project "/home/login/www/test"

Ruby on Rails 3 - Console options - Create a project

Mon, 14 Feb 2011 00:00:00 +0000

To create a project in Ruby on Rails 3 with a console you have to go until the parent folder of your future project. The command line is:

rails new myProject

For example, if you are in this path:

$ C:/ror3/

And you want to create a project named site1. Write this:

$ C:/ror3/ rails new site1

All files will be created.

Ruby on Rails 3 - Console options - Display version

Mon, 14 Feb 2011 00:00:00 +0000

To know the version of your Ruby just write on your console:

$ ruby -v

Ruby on Rails 3 - Server - Start the (native) Webrick server

Wed, 19 Jan 2011 00:00:00 +0000

To start the native server of Ruby on Rails, WEBrick, you have to open a shell and go until the path of your website and write “rails server” to start it.

Example on Windows:

$ C:/rubyOnRails/site1> rails server

Same for GNU/Linux:

$ home/name/rubyOnRails/site1> rails server

You will see the server start and show all what is happening when there is activity on your website. To display something on your server, just go on http://localhost/3000/ and some information will be displayed.

MySQL - Commands - Pager

Thu, 13 Jan 2011 00:00:00 +0000

There is a way on GNU/Linux to change the display of the result of the SQL query. Just type:

$ pager less -i -n -S

Now make a command and look this new display!