Cocoa Dev Central: Learn Objective-C Objective-C Objective-C is the primary language used to write Mac software. If you're comfortable with basic object-oriented concepts and the C language, Objective-C will make a lot of sense. If you don't know C, you should read the C Tutorial first. This tutorial is written and illustrated by Scott Stevenson Copyright © 2008 Scott Stevenson Calling Methods To get started as quickly as possible, let's look at some simple examples. [object method]; [object methodWithInput:input]; Methods can return a value: output = [object methodWithOutput]; output = [object methodWithInputAndOutput:input]; You can call methods on classes too, which is how you create objects. id myObject = [NSString string]; The id type means that the myObject variable can refer to any kind of object, so the actual class and the methods it implements aren't known when you compile the app. In this example, it's obvious the object type will be an NSString, so we can change the type: NSString* myString = [NSString string]; Accessors
About microformats - Webmaster Tools Help Marcado de datos con microformatos Los microformatos son sencillas convenciones (conocidas como entidades) que se usan en las páginas web para describir un tipo concreto de información (por ejemplo, una opinión, un evento, un producto, una empresa o una persona). Cada entidad tiene sus propias propiedades. Por ejemplo, una persona tiene las siguientes propiedades: nombre, dirección, cargo, empresa y dirección de correo electrónico. En general, los microformatos hacen uso del atributo class en las etiquetas HTML (que suelen ser <span> o <div>) para asignar nombres breves y descriptivos a las entidades y a sus propiedades. <div><img src="www.example.com/robertosanchez.jpg" /><strong>Roberto Sánchez</strong> Editor principal de Ediciones ACME Calle Mayor 4 Alcalá de Henares, Madrid 28801 </div> A continuación se muestra el mismo HTML marcado con el microformato hCard (persona). A continuación se indica cómo funciona este ejemplo. Microformatos anidados Contenido no visible
Tips for Linux Explorers Free & Public DNS Server List (Updated March 2014) By Tim Fisher Updated October 01, 2016. Your ISP automatically assigns DNS servers when your router or computer connects to the Internet via DHCP... but you don't have to use those. Below are free DNS servers you can use instead of the ones assigned, the best and most reliable of which, from the likes of Google and OpenDNS, you can find below: See How Do I Change DNS Servers? for help. Free & Public DNS Servers (Valid October 2016) continue reading below our video Note: Primary DNS servers are sometimes called preferred DNS servers and secondary DNS servers are sometimes called alternate DNS servers. Why Use Different DNS Servers? One reason you might want to change from the DNS servers assigned by your ISP is if you suspect there's a problem with the ones you're using now. Another reason to change DNS servers is if you're looking for a better performing service. The Small Print Don't worry, this is good small print!  Register here with SafeDNS for content filtering options in several areas.
Happy Nerds - Programming Links for Kids W3Clove :: site-wide markup validation tool Nick Farina - Git Is Simpler Than You Think It was about one year ago that we switched to Git. Previously, we used Subversion, through the Mac app Versions, which (rightly) holds an Apple Design Award. I made the executive decision to leave our comfy world of Versions because it seemed clear that Git was winning the Internet. But I pressed forward. It might as well have printed PC LOAD LETTER. “Not currently on any branch?!” Maintenance Required Git is not a Prius. By now we all know how to drive Git. Did you know the top result for “git tutorial” is this manpage on kernel.org? So instead let’s pull over, open the hood up, and poke around. The Basics We’ll run through some basic commands to make a repository for our examples: ~$ mkdir mysite ~$ cd mysite ~/mysite$ echo "<title>All About Cats</title>" > index.html ~/mysite$ git init ~/mysite$ git add index.html ~/mysite$ git commit -m "First commit, added a title." Now we have a git repository with one file and one commit, that is to say, one “version”. With me so far? The Repository
Chapter 12. Storage pools Suppose a storage administrator responsible for an NFS server creates a share to store guest virtual machines' data. The system administrator defines a pool on the host physical machine with the details of the share (nfs.example.com:/path/to/share should be mounted on /vm_data). When the pool is started, libvirt mounts the share on the specified directory, just as if the system administrator logged in and executed mount nfs.example.com:/path/to/share /vmdata. If the pool is configured to autostart, libvirt ensures that the NFS share is mounted on the directory specified when libvirt is started. Once the pool starts, the files that the NFS share, are reported as volumes, and the storage volumes' paths are then queried using the libvirt APIs. The volumes' paths can then be copied into the section of a guest virtual machine's XML definition file describing the source storage for the guest virtual machine's block devices.