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<title>NSPropertyListSerialization class documentation</title>
</head>
<body>
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<a href="Base.html">Up</a>
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<h1><a name="title$NSPropertyList">NSPropertyListSerialization class documentation</a></h1>
<h3>Authors</h3>
<dl>
<dt>Richard Frith-Macdonald (<a href="mailto:rfm@gnu.org"><code>rfm@gnu.org</code></a>)</dt>
<dd>
</dd>
</dl>
<p><b>Copyright:</b> (C) 2004 Free Software Foundation, Inc.</p>
<div>
</div>
<h1><a name="001000000000">
Software documentation for the
NSPropertyListSerialization class
</a></h1>
<h2><a name="class$NSPropertyListSerialization">NSPropertyListSerialization</a> : <a rel="gsdoc" href="NSObject.html#class$NSObject">NSObject</a></h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>Foundation/NSPropertyList.h</dd>
</dl>
</blockquote>
<div class="availability">
<b>Availability:</b> MacOS-X 10.0.0</div>
<br />
<div class="desc">
</p>
<p>
The NSPropertyListSerialization class provides
facilities for serialising and deserializing
property list data in a number of formats. A
property list is roughly an
<a rel="gsdoc" href="NSArray.html#class$NSArray">NSArray</a>
or
<a rel="gsdoc" href="NSDictionary.html#class$NSDictionary">NSDictionary</a>
object, with these or
<a rel="gsdoc" href="NSValue.html#class$NSNumber">NSNumber</a>
,
<a rel="gsdoc" href="NSData.html#class$NSData">NSData</a>
,
<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>
, or
<a rel="gsdoc" href="NSDate.html#class$NSDate">NSDate</a>
objects as members. (See below.)
</p>
<p>
</p>
<p>
You do not work with instances of this
class, instead you use a small number of
class methods to serialize and
deserialize property lists.
</p>
<p>
<br /> A <em>property list</em> may only
be one of the following classes -
<dl>
<dt>
<a rel="gsdoc" href="NSArray.html#class$NSArray">NSArray</a>
</dt>
<dd>
An array which is either empty or
contains only
<em>property list</em> objects. <br />
An array is delimited by round brackets
and its contents are comma
<em>separated</em> (there is no comma
after the last array element).
<pre>
( "one", "two", "three" )
</pre>
In XML format, an array is an element whose name is
<code>array</code> and whose content is the array
content.
<pre>
<array><string>one</string><string>two</string><string>three</string></array>
</pre>
</dd>
<dt>
<a rel="gsdoc" href="NSData.html#class$NSData">NSData</a>
</dt>
<dd>
An array is represented as a series of pairs of
hexadecimal characters (each pair representing
a byte of data) enclosed in angle brackets. Spaces are
ignored).
<pre>
< 54637374 696D67 >
</pre>
In XML format, a data object is an element whose name is
<code>data</code> and whose content is a stream of
base64 encoded bytes.
</dd>
<dt>
<a rel="gsdoc" href="NSDate.html#class$NSDate">NSDate</a>
</dt>
<dd>
Date objects were not traditionally allowed in
<em>property lists</em> but were added when the XML
format was introduced. GNUstep provides an extension
to the traditional <em>property list</em> format to
support date objects, but older code will not read
<em>property lists</em> containing this extension.
<br /> This format consists of an asterisk followed
by the letter 'D' then a date/time in YYYY-MM-DD
HH:MM:SS +/-ZZZZ format, all enclosed within angle
brackets.
<pre>
<*D2002-03-22 11:30:00 +0100>
</pre>
In XML format, a date object is an element whose name is
<code>date</code> and whose content is a date in the
format YYYY-MM-DDTHH:MM:SSZ (or the above dfate
format).
<pre>
<date>2002-03-22T11:30:00Z</date>
</pre>
</dd>
<dt>
<a rel="gsdoc" href="NSDictionary.html#class$NSDictionary">NSDictionary</a>
</dt>
<dd>
A dictionary which is either empty or contains only
<em>string</em> keys and <em>property list</em>
objects. <br /> A dictionary is delimited by curly
brackets and its contents are semicolon
<em>terminated</em> (there is a semicolon after each
value). Each item in the dictionary is a key/value
pair with an equals sign after the key and before the
value.
<pre>
{
"key1" = "value1";
}
</pre>
In XML format, a dictionary is an element whose name is
<code>dictionary</code> and whose content consists of
pairs of strings and other <em>property list</em>
objects.
<pre>
<dictionary>
<string>key1</string>
<string>value1</string>
</dictionary>
</pre>
</dd>
<dt>
<a rel="gsdoc" href="NSValue.html#class$NSNumber">NSNumber</a>
</dt>
<dd>
Number objects were not traditionally allowed in
<em>property lists</em> but were added when the XML
format was introduced. GNUstep provides an extension
to the traditional <em>property list</em> format to
support number objects, but older code will not
read <em>property lists</em> containing this
extension. <br /> Numbers are stored in a
variety of formats depending on their values.
<ul>
<li>
boolean... either <code><*BY></code> for
<code>YES</code> or <code><*BN></code> for
<code>NO</code>. <br /> In XML format this is
either <code><true /></code> or
<code><false /></code>
</li>
<li>
integer... <code><*INNN></code> where NNN
is an integer. <br /> In XML format this is
<code><integer>NNN<integer></code>
</li>
<li>
real... <code><*RNNN></code> where NNN is a
real number. <br /> In XML format this is
<code><real>NNN<real></code>
</li>
</ul>
</dd>
<dt>
<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>
</dt>
<dd>
A string is either stored literally (if it contains no
spaces or special characters), or is stored as a
quoted string with special characters escaped
where necessary. <br /> Escape conventions are
similar to those normally used in ObjectiveC
programming, using a backslash followed by -
<ul>
<li>
<strong>\</strong> a backslash character
</li>
<li>
<strong>"</strong> a quote character
</li>
<li>
<strong>b</strong> a backspace character
</li>
<li>
<strong>n</strong> a newline character
</li>
<li>
<strong>r</strong> a carriage return
character
</li>
<li>
<strong>t</strong> a tab character
</li>
<li>
<strong>OOO</strong> (three octal digits) an
arbitrary ascii character
</li>
<li>
<strong>UXXXX</strong> (where X is a
hexadecimal digit) a an arbitrary unicode
character
</li>
</ul>
<pre>
"hello world & others"
</pre>
In XML format, the string is simply stored in UTF8 format
as the content of a <code>string</code> element, and the
only character escapes required are those used by XML
such as the '&lt;' markup representing a '<'
character.
<pre>
<string>hello world &amp; others</string>"
</pre>
</dd>
</dl>
</div>
<b>Method summary</b>
<ul>
<li><a rel="gsdoc" href="NSPropertyList.html#method$NSPropertyListSerialization+dataFromPropertyList$format$errorDescription$">+dataFromPropertyList:format:errorDescription:</a></li>
<li><a rel="gsdoc" href="NSPropertyList.html#method$NSPropertyListSerialization+dataWithPropertyList$format$options$error$">+dataWithPropertyList:format:options:error:</a></li>
<li><a rel="gsdoc" href="NSPropertyList.html#method$NSPropertyListSerialization+propertyList$isValidForFormat$">+propertyList:isValidForFormat:</a></li>
<li><a rel="gsdoc" href="NSPropertyList.html#method$NSPropertyListSerialization+propertyListFromData$mutabilityOption$format$errorDescription$">+propertyListFromData:mutabilityOption:format:errorDescription:</a></li>
<li><a rel="gsdoc" href="NSPropertyList.html#method$NSPropertyListSerialization+propertyListWithData$options$format$error$">+propertyListWithData:options:format:error:</a></li>
<li><a rel="gsdoc" href="NSPropertyList.html#method$NSPropertyListSerialization+propertyListWithStream$options$format$error$">+propertyListWithStream:options:format:error:</a></li>
<li><a rel="gsdoc" href="NSPropertyList.html#method$NSPropertyListSerialization+writePropertyList$toStream$format$options$error$">+writePropertyList:toStream:format:options:error:</a></li>
</ul>
<hr width="50%" align="left" />
<div class="method">
<h3><a name="method$NSPropertyListSerialization+dataFromPropertyList$format$errorDescription$">dataFromPropertyList: format: errorDescription: </a></h3>
+ (<a rel="gsdoc" href="NSData.html#class$NSData">NSData</a>*) <b>dataFromPropertyList:</b> (id)aPropertyList<b> format:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSPropertyListFormat">NSPropertyListFormat</a>)aFormat<b> errorDescription:</b> (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>**)anErrorString;<br />
<div class="availability">
<b>Availability:</b> MacOS-X 10.0.0</div>
<br />
<div class="desc">
Creates and returns a data object containing a
serialized representation of plist. The argument
<var>aFormat</var> is used to determine the way in
which the data is serialised, and the
<var>anErrorString</var> argument is a pointer in
which an error message is returned on failure (
<code>nil</code> is returned on success).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSPropertyListSerialization+dataWithPropertyList$format$options$error$">dataWithPropertyList: format: options: error: </a></h3>
+ (<a rel="gsdoc" href="NSData.html#class$NSData">NSData</a>*) <b>dataWithPropertyList:</b> (id)aPropertyList<b> format:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSPropertyListFormat">NSPropertyListFormat</a>)aFormat<b> options:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSPropertyListWriteOptions">NSPropertyListWriteOptions</a>)anOption<b> error:</b> (out <a rel="gsdoc" href="NSError.html#class$NSError">NSError</a>**)error;<br />
<div class="availability">
<b>Availability:</b> MacOS-X 10.6.0</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSPropertyListSerialization+propertyList$isValidForFormat$">propertyList: isValidForFormat: </a></h3>
+ (BOOL) <b>propertyList:</b> (id)aPropertyList<b> isValidForFormat:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSPropertyListFormat">NSPropertyListFormat</a>)aFormat;<br />
<div class="availability">
<b>Availability:</b> MacOS-X 10.0.0</div>
<br />
<div class="desc">
Returns a flag indicating whether it is possible to
serialize <var>aPropertyList</var> in the format
<var>aFormat</var>.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSPropertyListSerialization+propertyListFromData$mutabilityOption$format$errorDescription$">propertyListFromData: mutabilityOption: format: errorDescription: </a></h3>
+ (id) <b>propertyListFromData:</b> (<a rel="gsdoc" href="NSData.html#class$NSData">NSData</a>*)data<b> mutabilityOption:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSPropertyListMutabilityOptions">NSPropertyListMutabilityOptions</a>)anOption<b> format:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSPropertyListFormat">NSPropertyListFormat</a>*)aFormat<b> errorDescription:</b> (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>**)anErrorString;<br />
<div class="availability">
<b>Availability:</b> MacOS-X 10.0.0</div>
<br />
<div class="desc">
Deserialises dataItem and returns the
resulting property list (or <code>nil</code> if
the <var>data</var> does not contain a property list
serialised in a supported format). <br /> The
argument <var>anOption</var> is used to control
whether the objects making up the deserialized
property list are mutable or not. <br /> The
argument <var>aFormat</var> is either null or a
pointer to a location in which the format of the
serialized property list will be returned.
<br /> Either <code>nil</code> or an error message
will be returned in <var>anErrorString</var>.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSPropertyListSerialization+propertyListWithData$options$format$error$">propertyListWithData: options: format: error: </a></h3>
+ (id) <b>propertyListWithData:</b> (<a rel="gsdoc" href="NSData.html#class$NSData">NSData</a>*)data<b> options:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSPropertyListReadOptions">NSPropertyListReadOptions</a>)anOption<b> format:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSPropertyListFormat">NSPropertyListFormat</a>*)aFormat<b> error:</b> (out <a rel="gsdoc" href="NSError.html#class$NSError">NSError</a>**)error;<br />
<div class="availability">
<b>Availability:</b> MacOS-X 10.6.0</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSPropertyListSerialization+propertyListWithStream$options$format$error$">propertyListWithStream: options: format: error: </a></h3>
+ (id) <b>propertyListWithStream:</b> (<a rel="gsdoc" href="NSStream.html#class$NSInputStream">NSInputStream</a>*)stream<b> options:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSPropertyListReadOptions">NSPropertyListReadOptions</a>)anOption<b> format:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSPropertyListFormat">NSPropertyListFormat</a>*)aFormat<b> error:</b> (out <a rel="gsdoc" href="NSError.html#class$NSError">NSError</a>**)error;<br />
<div class="availability">
<b>Availability:</b> MacOS-X 10.6.0</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSPropertyListSerialization+writePropertyList$toStream$format$options$error$">writePropertyList: toStream: format: options: error: </a></h3>
+ (<a rel="gsdoc" href="TypesAndConstants.html#type$NSInteger">NSInteger</a>) <b>writePropertyList:</b> (id)aPropertyList<b> toStream:</b> (<a rel="gsdoc" href="NSStream.html#class$NSOutputStream">NSOutputStream</a>*)stream<b> format:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSPropertyListFormat">NSPropertyListFormat</a>)aFormat<b> options:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSPropertyListWriteOptions">NSPropertyListWriteOptions</a>)anOption<b> error:</b> (out <a rel="gsdoc" href="NSError.html#class$NSError">NSError</a>**)error;<br />
<div class="availability">
<b>Availability:</b> MacOS-X 10.6.0</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
</div>
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