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authorLeo Tenenbaum <pommicket@gmail.com>2018-08-20 21:12:06 -0400
committerLeo Tenenbaum <pommicket@gmail.com>2018-08-20 21:12:06 -0400
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-<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
-<html>
-<head>
-<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
-<title>Introduction</title>
-<meta name="generator" content="DocBook XSL Stylesheets V1.76.1">
-<link rel="home" href="index.html" title="GIO Reference Manual">
-<link rel="up" href="pt01.html" title="Part I. GIO Overview">
-<link rel="prev" href="pt01.html" title="Part I. GIO Overview">
-<link rel="next" href="ch02.html" title="Compiling GIO applications">
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-<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"><tr valign="middle">
-<td><a accesskey="p" href="pt01.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td>
-<td><a accesskey="u" href="pt01.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td>
-<td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td>
-<th width="100%" align="center">GIO Reference Manual</th>
-<td><a accesskey="n" href="ch02.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td>
-</tr></table>
-<div class="chapter">
-<div class="titlepage"><div><div><h2 class="title">
-<a name="idp933856"></a>Introduction</h2></div></div></div>
-<p>
- GIO is striving to provide a modern, easy-to-use VFS API that sits
- at the right level in the library stack. The goal is to overcome the
- shortcomings of GnomeVFS and provide an API that is so good that
- developers prefer it over raw POSIX calls. Among other things
- that means using GObject. It also means not cloning the POSIX
- API, but providing higher-level, document-centric interfaces.
- </p>
-<p>
- The abstract file system model of GIO consists of a number of
- interfaces and base classes for I/O and files:
- </p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody>
-<tr>
-<td><p><span class="term">GFile</span></p></td>
-<td><p>reference to a file</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GFileInfo</span></p></td>
-<td><p>information about a file or filesystem</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GFileEnumerator</span></p></td>
-<td><p>list files in directories</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GDrive</span></p></td>
-<td><p>represents a drive</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GVolume</span></p></td>
-<td><p>represents a file system in an abstract way</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GMount</span></p></td>
-<td><p>represents a mounted file system</p></td>
-</tr>
-</tbody>
-</table></div>
-<p>
- Then there is a number of stream classes, similar to the input and
- output stream hierarchies that can be found in frameworks like Java:
- </p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody>
-<tr>
-<td><p><span class="term">GInputStream</span></p></td>
-<td><p>read data</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GOutputStream</span></p></td>
-<td><p>write data</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GIOStream</span></p></td>
-<td><p>read and write data</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GSeekable</span></p></td>
-<td><p>interface optionally implemented by streams to support seeking</p></td>
-</tr>
-</tbody>
-</table></div>
-<p>
- There are interfaces related to applications and the types
- of files they handle:
- </p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody>
-<tr>
-<td><p><span class="term">GAppInfo</span></p></td>
-<td><p>information about an installed application</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GIcon</span></p></td>
-<td><p>abstract type for file and application icons</p></td>
-</tr>
-</tbody>
-</table></div>
-<p>
- There is a framework for storing and retrieving application settings:
- </p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody><tr>
-<td><p><span class="term">GSettings</span></p></td>
-<td><p>stores and retrieves application settings</p></td>
-</tr></tbody>
-</table></div>
-<p>
- There is support for network programming, including connectivity monitoring,
- name resolution, lowlevel socket APIs and highlevel client and server
- helper classes:
- </p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody>
-<tr>
-<td><p><span class="term">GSocket</span></p></td>
-<td><p>lowlevel platform independent socket object</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GResolver</span></p></td>
-<td><p>asynchronous and cancellable DNS resolver</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GSocketClient</span></p></td>
-<td><p>high-level network client helper</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GSocketService</span></p></td>
-<td><p>high-level network server helper</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GSocketConnection</span></p></td>
-<td><p>network connection stream</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GNetworkMonitor</span></p></td>
-<td><p>network connectivity monitoring</p></td>
-</tr>
-</tbody>
-</table></div>
-<p>
- There is support for connecting to D-Bus,
- sending and receiving messages, owning and watching bus names,
- and making objects available on the bus:
- </p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody>
-<tr>
-<td><p><span class="term">GDBusConnection</span></p></td>
-<td><p>a D-Bus connection</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GDBusMethodInvocation</span></p></td>
-<td><p>for handling remove calls</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GDBusServer</span></p></td>
-<td><p>helper for accepting connections</p></td>
-</tr>
-<tr>
-<td><p><span class="term">GDBusProxy</span></p></td>
-<td><p>proxy to access D-Bus interfaces on a remote object</p></td>
-</tr>
-</tbody>
-</table></div>
-<p>
- Beyond these, GIO provides facilities for file monitoring,
- asynchronous I/O and filename completion. In addition to the
- interfaces, GIO provides implementations for the local case.
- Implementations for various network file systems are provided
- by the GVFS package as loadable modules.
- </p>
-<p>
- Other design choices which consciously break with the GnomeVFS
- design are to move backends out-of-process, which minimizes the
- dependency bloat and makes the whole system more robust. The backends
- are not included in GIO, but in the separate GVFS package. The GVFS
- package also contains the GVFS daemon, which spawn further mount
- daemons for each individual connection.
- </p>
-<div class="figure">
-<a name="gvfs-overview"></a><p class="title"><b>Figure 1. GIO in the GTK+ library stack</b></p>
-<div class="figure-contents"><div><img src="gvfs-overview.png" alt="GIO in the GTK+ library stack"></div></div>
-</div>
-<br class="figure-break"><p>
- The GIO model of I/O is stateful: if an application establishes e.g.
- a SFTP connection to a server, it becomes available to all applications
- in the session; the user does not have to enter his password over
- and over again.
- </p>
-<p>
- One of the big advantages of putting the VFS in the GLib layer
- is that GTK+ can directly use it, e.g. in the filechooser.
- </p>
-</div>
-<div class="footer">
-<hr>
- Generated by GTK-Doc V1.18</div>
-</body>
-</html> \ No newline at end of file