How to Manage CPAN Urllist

CPAN is a Perl tool for installing and managing modules. CPAN stands for the Comprehensive Perl Archive Network. There are many mirrors around the world that host the same CPAN archive. Sometimes mirrors shut down or you may want to add mirrors that are closer to you. These examples demonstrate how to add and remove mirrors from your configuration.

Input, Output, and Concatenation with Haskell

Standard in and Standard out (STDIN/STDOUT) are very common methods of interacting with the user. Standard in is typically the keyboard and standard out is the terminal. Haskell makes this very easy to access. The getLine function gets a value from the user and putStrLn and putStr allow you to write to output. The ++ operator is used to concatenate strings.

Hello World with NASM Assembler

NASM, or The Netwide Assembler, is an x86 compiler that allows us to turn Assembly code in to machine code object files. Once we have an object file, we can link it and create the final executable. This example is meant for Unix systems or Windows with MinGW toolchain installed. On Debian systems, it can be installed with the nasm package. Put the code below in to hello.asm

Hello World with Tcl

Tcl is a language similar Bash because every line is a command and it can be scripted similar to shell scripts. Tcl can be used by itself but it typically embedded inside larger applications. Tcl with Tk toolkit allows you to create GUI applications. Once nice thing about Tcl/Tk is that it is widely available and works on multiple platforms. It does not create the nicest looking GUIs because it does not use native windows, but they are effective. Let's look at the most basic Hello World program. Let's name it hello.tcl.

How to Write GTK Applications with PHP

It is possible to write GTK2 application using PHP. It is a little work to get it compiled and installed, but once configured it is easy to write programs with GTK2. As of June 22, 2015 a development branch has been created for GTK3. Follow these installation instructions first. Then try out the code samples below. Load the php-gtk2 module in your php.ini as well.

NanoDano on Tue, 07/28/2015 - 00:09

How to Crawl Web Pages with PHP

Uwe Hunfeld provides an object oriented library called PHPCrawl available at http://phpcrawl.cuab.de. This class can be used to crawl web pages with many different parameters. It also allows you to process each page and do what manipulation or scraping you need to do. You accomplish this by overriding the base class and implementing your own functionality in the handleDocumentInfo() and handleHeaderInfo() functions. Use the code below as an example of how to create your own web crawler. If you want to learn how to parse the HTML DOM and extract things like links and headings, check out the post on How to Parse HTML DOM with PHP.

How to Use Tk to Make GUI Applications with PHP

PHP/TK implements object oriented bindings for TCL/TK that can be used to create GUI applications. It only works on Unix systems. PHP must be configured to allow dynamic linking with enable_dl = On in the php.ini. The shared object file (tk.so) can be downloaded manually from PECL. The shared object file goes inside your php modules folder which is typically something like /usr/lib/php/modules. Look for the folder with other .so files or refer to your particular distribution documentation.