1
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
3
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
4
<title>Virtual File System Objects</title>
5
<style type="text/css">
8
font-family: Verdana, sans-serif;
13
a:visited { color: #734559 }
15
.logo { position:absolute; margin:3px; }
31
.toolbar a { color: white; text-decoration: none; padding: 6px 12px; }
32
.toolbar a:visited { color: white; }
33
.toolbar a:hover { color: #044a64; background: white; }
35
.content { margin: 5%; }
36
.content dt { font-weight:bold; }
37
.content dd { margin-bottom: 25px; margin-left:20%; }
38
.content ul { padding:0px; padding-left: 15px; margin:0px; }
41
.se { background: url(../images/se.gif) 100% 100% no-repeat #044a64}
42
.sw { background: url(../images/sw.gif) 0% 100% no-repeat }
43
.ne { background: url(../images/ne.gif) 100% 0% no-repeat }
44
.nw { background: url(../images/nw.gif) 0% 0% no-repeat }
46
/* Things for "fancyformat" documents start here. */
47
.fancy img+p {font-style:italic}
48
.fancy .codeblock i { color: darkblue; }
49
.fancy h1,.fancy h2,.fancy h3,.fancy h4 {font-weight:normal;color:#044a64}
50
.fancy h2 { margin-left: 10px }
51
.fancy h3 { margin-left: 20px }
52
.fancy h4 { margin-left: 30px }
53
.fancy th {white-space:nowrap;text-align:left;border-bottom:solid 1px #444}
54
.fancy th, .fancy td {padding: 0.2em 1ex; vertical-align:top}
55
.fancy #toc a { color: darkblue ; text-decoration: none }
56
.fancy .todo { color: #AA3333 ; font-style : italic }
57
.fancy .todo:before { content: 'TODO:' }
58
.fancy p.todo { border: solid #AA3333 1px; padding: 1ex }
59
.fancy img { display:block; }
60
.fancy :link:hover, .fancy :visited:hover { background: wheat }
61
.fancy p,.fancy ul,.fancy ol { margin: 1em 5ex }
62
.fancy li p { margin: 1em 0 }
63
/* End of "fancyformat" specific rules. */
69
<div><!-- container div to satisfy validator -->
71
<a href="../index.html">
72
<img class="logo" src="../images/sqlite370_banner.gif" alt="SQLite Logo"
74
<div><!-- IE hack to prevent disappearing logo--></div>
75
<div class="tagline">Small. Fast. Reliable.<br>Choose any three.</div>
77
<table width=100% style="clear:both"><tr><td>
78
<div class="se"><div class="sw"><div class="ne"><div class="nw">
79
<table width=100% style="padding:0;margin:0;cell-spacing:0"><tr>
82
<a href="../about.html">About</a>
83
<a href="../sitemap.html">Sitemap</a>
84
<a href="../docs.html">Documentation</a>
85
<a href="../download.html">Download</a>
86
<a href="../copyright.html">License</a>
87
<a href="../news.html">News</a>
88
<a href="../support.html">Support</a>
91
gMsg = "Search SQLite Docs..."
92
function entersearch() {
93
var q = document.getElementById("q");
94
if( q.value == gMsg ) { q.value = "" }
95
q.style.color = "black"
96
q.style.fontStyle = "normal"
98
function leavesearch() {
99
var q = document.getElementById("q");
100
if( q.value == "" ) {
102
q.style.color = "#044a64"
103
q.style.fontStyle = "italic"
108
<div style="padding:0 1em 0px 0;white-space:nowrap">
109
<form name=f method="GET" action="http://www.sqlite.org/search">
110
<input id=q name=q type=text
111
onfocus="entersearch()" onblur="leavesearch()" style="width:24ex;padding:1px 1ex; border:solid white 1px; font-size:0.9em ; font-style:italic;color:#044a64;" value="Search SQLite Docs...">
112
<input type=submit value="Go" style="border:solid white 1px;background-color:#044a64;color:white;font-size:0.9em;padding:0 1ex">
116
</div></div></div></div>
118
<div class=startsearch></div>
120
<a href="intro.html"><h2>SQLite C Interface</h2></a><h2>Virtual File System Objects</h2><blockquote><pre>sqlite3_vfs *sqlite3_vfs_find(const char *zVfsName);
121
int sqlite3_vfs_register(sqlite3_vfs*, int makeDflt);
122
int sqlite3_vfs_unregister(sqlite3_vfs*);
123
</pre></blockquote><p>
124
A virtual filesystem (VFS) is an <a href="../c3ref/vfs.html">sqlite3_vfs</a> object
125
that SQLite uses to interact
126
with the underlying operating system. Most SQLite builds come with a
127
single default VFS that is appropriate for the host computer.
128
New VFSes can be registered and existing VFSes can be unregistered.
129
The following interfaces are provided.</p>
131
<p>The sqlite3_vfs_find() interface returns a pointer to a VFS given its name.
132
Names are case sensitive.
133
Names are zero-terminated UTF-8 strings.
134
If there is no match, a NULL pointer is returned.
135
If zVfsName is NULL then the default VFS is returned.</p>
137
<p>New VFSes are registered with sqlite3_vfs_register().
138
Each new VFS becomes the default VFS if the makeDflt flag is set.
139
The same VFS can be registered multiple times without injury.
140
To make an existing VFS into the default VFS, register it again
141
with the makeDflt flag set. If two different VFSes with the
142
same name are registered, the behavior is undefined. If a
143
VFS is registered with a name that is NULL or an empty string,
144
then the behavior is undefined.</p>
146
<p>Unregister a VFS with the sqlite3_vfs_unregister() interface.
147
If the default VFS is unregistered, another VFS is chosen as
148
the default. The choice for the new VFS is arbitrary.
149
</p><p>See also lists of
150
<a href="objlist.html">Objects</a>,
151
<a href="constlist.html">Constants</a>, and
152
<a href="funclist.html">Functions</a>.</p>
added
removed
c3ref/vfs_find.html
