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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Exiv2: Exiv2::Value Class Reference</title>
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<a class="el" href="namespaceExiv2.html">Exiv2</a>::<a class="el" href="classExiv2_1_1Value.html">Value</a></div>
<h1>Exiv2::Value Class Reference</h1><!-- doxytag: class="Exiv2::Value" -->Common interface for all types of values used with metadata.
<a href="#_details">More...</a>
<p>
<code>#include <value.hpp></code>
<p>
Inheritance diagram for Exiv2::Value:<p><center><img src="classExiv2_1_1Value__inherit__graph.png" border="0" usemap="#Exiv2_1_1Value__inherit__map" alt="Inheritance graph"></center>
<map name="Exiv2_1_1Value__inherit__map">
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<area href="classExiv2_1_1DateValue.html" shape="rect" coords="152,82,275,106" alt="">
<area href="classExiv2_1_1StringValueBase.html" shape="rect" coords="299,82,459,106" alt="">
<area href="classExiv2_1_1TimeValue.html" shape="rect" coords="483,82,608,106" alt="">
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<area href="classExiv2_1_1CommentValue.html" shape="rect" coords="302,156,456,180" alt="">
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<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center><a href="classExiv2_1_1Value-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Types</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="0f62e585b82c97738858b743e60dff21"></a><!-- doxytag: member="Exiv2::Value::AutoPtr" ref="0f62e585b82c97738858b743e60dff21" args="" -->
typedef std::auto_ptr< <a class="el" href="classExiv2_1_1Value.html">Value</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#0f62e585b82c97738858b743e60dff21">AutoPtr</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Shortcut for a Value auto pointer. <br></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td colspan="2"><div class="groupHeader">Creators</div></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="b475b1680c6fa36a092c4584f70a8027"></a><!-- doxytag: member="Exiv2::Value::Value" ref="b475b1680c6fa36a092c4584f70a8027" args="(TypeId typeId)" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#b475b1680c6fa36a092c4584f70a8027">Value</a> (<a class="el" href="namespaceExiv2.html#5153319711f35fe81cbc13f4b852450c">TypeId</a> typeId)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Constructor, taking a type id to initialize the base class with. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="f312ee440cf4570e6a856143c2671e0e"></a><!-- doxytag: member="Exiv2::Value::Value" ref="f312ee440cf4570e6a856143c2671e0e" args="(const Value &rhs)" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#f312ee440cf4570e6a856143c2671e0e">Value</a> (const <a class="el" href="classExiv2_1_1Value.html">Value</a> &rhs)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Copy constructor. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="d27fa9023be70d47b5f101d1f2f565cc"></a><!-- doxytag: member="Exiv2::Value::~Value" ref="d27fa9023be70d47b5f101d1f2f565cc" args="()" -->
virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#d27fa9023be70d47b5f101d1f2f565cc">~Value</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Virtual destructor. <br></td></tr>
<tr><td colspan="2"><div class="groupHeader">Manipulators</div></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual int </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#cc8870f802ebcdf9d4e081816ad8956e">read</a> (const <a class="el" href="namespaceExiv2.html#16f60a5bd4207fe155f6cf93a15efa72">byte</a> *buf, long len, <a class="el" href="namespaceExiv2.html#94c225faf6d6c611a3828fae1c28efa6">ByteOrder</a> byteOrder)=0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Read the value from a character buffer. <a href="#cc8870f802ebcdf9d4e081816ad8956e"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual int </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#2864378d7572310aa5f4cf4127365862">read</a> (const std::string &buf)=0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the value from a string buffer. The format of the string corresponds to that of the <a class="el" href="classExiv2_1_1Value.html#2518f5ba09fc8c00785c57a119892c4c">write()</a> method, i.e., a string obtained through the <a class="el" href="classExiv2_1_1Value.html#2518f5ba09fc8c00785c57a119892c4c">write()</a> method can be read by this function. <a href="#2864378d7572310aa5f4cf4127365862"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual int </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#6e8f3c20bf5d09f34371660a6cf50af3">setDataArea</a> (const <a class="el" href="namespaceExiv2.html#16f60a5bd4207fe155f6cf93a15efa72">byte</a> *buf, long len)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the data area, if the value has one by copying (cloning) the buffer pointed to by buf. <a href="#6e8f3c20bf5d09f34371660a6cf50af3"></a><br></td></tr>
<tr><td colspan="2"><div class="groupHeader">Accessors</div></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="1a56299aad4e614c4f0225d97530c038"></a><!-- doxytag: member="Exiv2::Value::typeId" ref="1a56299aad4e614c4f0225d97530c038" args="() const " -->
<a class="el" href="namespaceExiv2.html#5153319711f35fe81cbc13f4b852450c">TypeId</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#1a56299aad4e614c4f0225d97530c038">typeId</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the type identifier (Exif data format type). <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="0b07106aa570a506f4211c7bfa605fb0"></a><!-- doxytag: member="Exiv2::Value::toString" ref="0b07106aa570a506f4211c7bfa605fb0" args="() const " -->
std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#0b07106aa570a506f4211c7bfa605fb0">toString</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the value as a string. Implemented in terms of <a class="el" href="classExiv2_1_1Value.html#2518f5ba09fc8c00785c57a119892c4c">write(std::ostream& os) const</a> of the concrete class. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="84db34d85bac0f5e159d67a1e10c7976"></a><!-- doxytag: member="Exiv2::Value::clone" ref="84db34d85bac0f5e159d67a1e10c7976" args="() const " -->
<a class="el" href="classExiv2_1_1Value.html#0f62e585b82c97738858b743e60dff21">AutoPtr</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#84db34d85bac0f5e159d67a1e10c7976">clone</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return an auto-pointer to a copy of itself (deep copy). The caller owns this copy and the auto-pointer ensures that it will be deleted. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual long </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#3bf4f9c2eda4f7850a390de98668ce15">copy</a> (<a class="el" href="namespaceExiv2.html#16f60a5bd4207fe155f6cf93a15efa72">byte</a> *buf, <a class="el" href="namespaceExiv2.html#94c225faf6d6c611a3828fae1c28efa6">ByteOrder</a> byteOrder) const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Write value to a data buffer. <a href="#3bf4f9c2eda4f7850a390de98668ce15"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="e046b0b081c2be1cf160db595c66fe6d"></a><!-- doxytag: member="Exiv2::Value::count" ref="e046b0b081c2be1cf160db595c66fe6d" args="() const =0" -->
virtual long </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#e046b0b081c2be1cf160db595c66fe6d">count</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the number of components of the value. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="2929f67840fb0565b868993b140ed0ff"></a><!-- doxytag: member="Exiv2::Value::size" ref="2929f67840fb0565b868993b140ed0ff" args="() const =0" -->
virtual long </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#2929f67840fb0565b868993b140ed0ff">size</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the size of the value in bytes. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="2518f5ba09fc8c00785c57a119892c4c"></a><!-- doxytag: member="Exiv2::Value::write" ref="2518f5ba09fc8c00785c57a119892c4c" args="(std::ostream &os) const =0" -->
virtual std::ostream & </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#2518f5ba09fc8c00785c57a119892c4c">write</a> (std::ostream &os) const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Write the value to an output stream. You do not usually have to use this function; it is used for the implementation of the output operator for Value, <a class="el" href="namespaceExiv2.html#be882054db13fc2f4f6f7e8e1261d982">operator<<(std::ostream &os, const Value &value)</a>. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual long </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#4530a3fc3e2305cf994de5476f46f953">toLong</a> (long n=0) const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Convert the n-th component of the value to a long. The behaviour of this method may be undefined if there is no n-th component. <a href="#4530a3fc3e2305cf994de5476f46f953"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual float </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#22d257caa6c1ffe6416ce02de7bd8c1c">toFloat</a> (long n=0) const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Convert the n-th component of the value to a float. The behaviour of this method may be undefined if there is no n-th component. <a href="#22d257caa6c1ffe6416ce02de7bd8c1c"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="namespaceExiv2.html#95756f3f7fa19103f83addf5fa088a30">Rational</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#595a4cb549bec8c19d290ca3e95a2678">toRational</a> (long n=0) const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Convert the n-th component of the value to a Rational. The behaviour of this method may be undefined if there is no n-th component. <a href="#595a4cb549bec8c19d290ca3e95a2678"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="868dd11bd0ad0d257e2374b13d6683b5"></a><!-- doxytag: member="Exiv2::Value::sizeDataArea" ref="868dd11bd0ad0d257e2374b13d6683b5" args="() const " -->
virtual long </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#868dd11bd0ad0d257e2374b13d6683b5">sizeDataArea</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the size of the data area, 0 if there is none. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="classExiv2_1_1DataBuf.html">DataBuf</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#feab3bcedeb6f60ed92085c5fd33340f">dataArea</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return a copy of the data area if the value has one. The caller owns this copy and <a class="el" href="classExiv2_1_1DataBuf.html">DataBuf</a> ensures that it will be deleted. <a href="#feab3bcedeb6f60ed92085c5fd33340f"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static <a class="el" href="classExiv2_1_1Value.html#0f62e585b82c97738858b743e60dff21">AutoPtr</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#7a6c027316e3dec0f7e79430f104c137">create</a> (<a class="el" href="namespaceExiv2.html#5153319711f35fe81cbc13f4b852450c">TypeId</a> typeId)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A (simple) factory to create a <a class="el" href="classExiv2_1_1Value.html">Value</a> type. <a href="#7a6c027316e3dec0f7e79430f104c137"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="a2a9041cbd30d86260820b818cdf232e"></a><!-- doxytag: member="Exiv2::Value::operator=" ref="a2a9041cbd30d86260820b818cdf232e" args="(const Value &rhs)" -->
<a class="el" href="classExiv2_1_1Value.html">Value</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Value.html#a2a9041cbd30d86260820b818cdf232e">operator=</a> (const <a class="el" href="classExiv2_1_1Value.html">Value</a> &rhs)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Assignment operator. Protected so that it can only be used by subclasses but not directly. <br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Common interface for all types of values used with metadata.
<p>
The interface provides a uniform way to access values independent from their actual C++ type for simple tasks like reading the values from a string or data buffer. For other tasks, like modifying values you may need to downcast it to the actual subclass of Value so that you can access the subclass specific interface.
<p>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="3bf4f9c2eda4f7850a390de98668ce15"></a><!-- doxytag: member="Exiv2::Value::copy" ref="3bf4f9c2eda4f7850a390de98668ce15" args="(byte *buf, ByteOrder byteOrder) const =0" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
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<td class="mdRow">
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<td class="md" nowrap valign="top">virtual long Exiv2::Value::copy </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="namespaceExiv2.html#16f60a5bd4207fe155f6cf93a15efa72">byte</a> * </td>
<td class="mdname" nowrap> <em>buf</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap><a class="el" href="namespaceExiv2.html#94c225faf6d6c611a3828fae1c28efa6">ByteOrder</a> </td>
<td class="mdname" nowrap> <em>byteOrder</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"> const<code> [pure virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Write value to a data buffer.
<p>
The user must ensure that the buffer has enough memory. Otherwise the call results in undefined behaviour.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>buf</em> </td><td>Data buffer to write to. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>byteOrder</em> </td><td>Applicable byte order (little or big endian). </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>Number of bytes written. </dd></dl>
<p>
Implemented in <a class="el" href="classExiv2_1_1DataValue.html#d96c8ded5036c82f33d9eb214ed12587">Exiv2::DataValue</a>, <a class="el" href="classExiv2_1_1StringValueBase.html#68503471612daaf314f4b70e2216ef3b">Exiv2::StringValueBase</a>, <a class="el" href="classExiv2_1_1DateValue.html#b058c2ba2c53659564a8adfa3a751cd1">Exiv2::DateValue</a>, <a class="el" href="classExiv2_1_1TimeValue.html#198a39cf744c504de9b3d215988bab9d">Exiv2::TimeValue</a>, and <a class="el" href="classExiv2_1_1ValueType.html#106239c4587a27ce53b6a59b63d7b348">Exiv2::ValueType< T ></a>. </td>
</tr>
</table>
<a class="anchor" name="7a6c027316e3dec0f7e79430f104c137"></a><!-- doxytag: member="Exiv2::Value::create" ref="7a6c027316e3dec0f7e79430f104c137" args="(TypeId typeId)" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"><a class="el" href="classExiv2_1_1Value.html#0f62e585b82c97738858b743e60dff21">Value::AutoPtr</a> Exiv2::Value::create </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="namespaceExiv2.html#5153319711f35fe81cbc13f4b852450c">TypeId</a> </td>
<td class="mdname1" valign="top" nowrap> <em>typeId</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [static]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
A (simple) factory to create a <a class="el" href="classExiv2_1_1Value.html">Value</a> type.
<p>
The following <a class="el" href="classExiv2_1_1Value.html">Value</a> subclasses are created depending on typeId:<br>
<br>
<table border="1" cellspacing="3" cellpadding="3">
<tr>
<td class="indexkey"><b>typeId</b></td><td class="indexvalue"><b>Value subclass</b> </td></tr>
<tr>
<td class="indexkey">invalidTypeId</td><td class="indexvalue">DataValue(invalidTypeId) </td></tr>
<tr>
<td class="indexkey">unsignedByte</td><td class="indexvalue">DataValue(unsignedByte) </td></tr>
<tr>
<td class="indexkey">asciiString</td><td class="indexvalue">AsciiValue </td></tr>
<tr>
<td class="indexkey">string</td><td class="indexvalue">StringValue </td></tr>
<tr>
<td class="indexkey">unsignedShort</td><td class="indexvalue">ValueType < uint16_t > </td></tr>
<tr>
<td class="indexkey">unsignedLong</td><td class="indexvalue">ValueType < uint32_t > </td></tr>
<tr>
<td class="indexkey">unsignedRational</td><td class="indexvalue">ValueType < URational > </td></tr>
<tr>
<td class="indexkey">invalid6</td><td class="indexvalue">DataValue(invalid6) </td></tr>
<tr>
<td class="indexkey">undefined</td><td class="indexvalue">DataValue </td></tr>
<tr>
<td class="indexkey">signedShort</td><td class="indexvalue">ValueType < int16_t > </td></tr>
<tr>
<td class="indexkey">signedLong</td><td class="indexvalue">ValueType < int32_t > </td></tr>
<tr>
<td class="indexkey">signedRational</td><td class="indexvalue">ValueType < Rational > </td></tr>
<tr>
<td class="indexkey">date</td><td class="indexvalue">DateValue </td></tr>
<tr>
<td class="indexkey">time</td><td class="indexvalue">TimeValue </td></tr>
<tr>
<td class="indexkey">comment</td><td class="indexvalue">CommentValue </td></tr>
<tr>
<td class="indexkey"><em>default:</em></td><td class="indexvalue">DataValue(typeId) </td></tr>
</table>
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>typeId</em> </td><td>Type of the value. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>Auto-pointer to the newly created <a class="el" href="classExiv2_1_1Value.html">Value</a>. The caller owns this copy and the auto-pointer ensures that it will be deleted. </dd></dl>
<dl compact><dt><b>Examples: </b></dt><dd>
<a class="el" href="addmoddel_8cpp-example.html#a2">addmoddel.cpp</a>.</dl> </td>
</tr>
</table>
<a class="anchor" name="feab3bcedeb6f60ed92085c5fd33340f"></a><!-- doxytag: member="Exiv2::Value::dataArea" ref="feab3bcedeb6f60ed92085c5fd33340f" args="() const " --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">virtual <a class="el" href="classExiv2_1_1DataBuf.html">DataBuf</a> Exiv2::Value::dataArea </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const<code> [inline, virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Return a copy of the data area if the value has one. The caller owns this copy and <a class="el" href="classExiv2_1_1DataBuf.html">DataBuf</a> ensures that it will be deleted.
<p>
Values may have a data area, which can contain additional information besides the actual value. This method is used to access such a data area.<p>
<dl compact><dt><b>Returns:</b></dt><dd>A <a class="el" href="classExiv2_1_1DataBuf.html">DataBuf</a> containing a copy of the data area or an empty <a class="el" href="classExiv2_1_1DataBuf.html">DataBuf</a> if the value does not have a data area assigned. </dd></dl>
<p>
Reimplemented in <a class="el" href="classExiv2_1_1ValueType.html#b30d2836320975c3ad60312bf0a5133d">Exiv2::ValueType< T ></a>. </td>
</tr>
</table>
<a class="anchor" name="2864378d7572310aa5f4cf4127365862"></a><!-- doxytag: member="Exiv2::Value::read" ref="2864378d7572310aa5f4cf4127365862" args="(const std::string &buf)=0" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">virtual int Exiv2::Value::read </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const std::string & </td>
<td class="mdname1" valign="top" nowrap> <em>buf</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [pure virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Set the value from a string buffer. The format of the string corresponds to that of the <a class="el" href="classExiv2_1_1Value.html#2518f5ba09fc8c00785c57a119892c4c">write()</a> method, i.e., a string obtained through the <a class="el" href="classExiv2_1_1Value.html#2518f5ba09fc8c00785c57a119892c4c">write()</a> method can be read by this function.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>buf</em> </td><td>The string to read from.</td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>0 if successful. </dd></dl>
<p>
Implemented in <a class="el" href="classExiv2_1_1DataValue.html#fb8d9321e3b80c239b3a8df9b1ca4083">Exiv2::DataValue</a>, <a class="el" href="classExiv2_1_1StringValueBase.html#7e1a2e4e99a63eb1ef815317f012c57b">Exiv2::StringValueBase</a>, <a class="el" href="classExiv2_1_1AsciiValue.html#8dba62825094109881aa7dc37492a2a3">Exiv2::AsciiValue</a>, <a class="el" href="classExiv2_1_1CommentValue.html#0dc1a2489912d18b05ba25881ed172c3">Exiv2::CommentValue</a>, <a class="el" href="classExiv2_1_1DateValue.html#6eba2be86bf4744bc947b0909aa0c6f2">Exiv2::DateValue</a>, <a class="el" href="classExiv2_1_1TimeValue.html#8160552dd6b05d970151b2622aa09459">Exiv2::TimeValue</a>, and <a class="el" href="classExiv2_1_1ValueType.html#f66d05b6e6cf774f58f5110b5976a329">Exiv2::ValueType< T ></a>. </td>
</tr>
</table>
<a class="anchor" name="cc8870f802ebcdf9d4e081816ad8956e"></a><!-- doxytag: member="Exiv2::Value::read" ref="cc8870f802ebcdf9d4e081816ad8956e" args="(const byte *buf, long len, ByteOrder byteOrder)=0" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">virtual int Exiv2::Value::read </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="namespaceExiv2.html#16f60a5bd4207fe155f6cf93a15efa72">byte</a> * </td>
<td class="mdname" nowrap> <em>buf</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>long </td>
<td class="mdname" nowrap> <em>len</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap><a class="el" href="namespaceExiv2.html#94c225faf6d6c611a3828fae1c28efa6">ByteOrder</a> </td>
<td class="mdname" nowrap> <em>byteOrder</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"><code> [pure virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Read the value from a character buffer.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>buf</em> </td><td>Pointer to the data buffer to read from </td></tr>
<tr><td valign="top"></td><td valign="top"><em>len</em> </td><td>Number of bytes in the data buffer </td></tr>
<tr><td valign="top"></td><td valign="top"><em>byteOrder</em> </td><td>Applicable byte order (little or big endian).</td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>0 if successful. </dd></dl>
<p>
Implemented in <a class="el" href="classExiv2_1_1DataValue.html#927fef988688e4b33d4fcaffb51679dc">Exiv2::DataValue</a>, <a class="el" href="classExiv2_1_1StringValueBase.html#b43f48f366770175d7a07ad229ebbd2d">Exiv2::StringValueBase</a>, <a class="el" href="classExiv2_1_1DateValue.html#cb8fa5f6fcd5383b5fddce094a251961">Exiv2::DateValue</a>, <a class="el" href="classExiv2_1_1TimeValue.html#083325ce2c9ff4a693ccc586c5785f5e">Exiv2::TimeValue</a>, and <a class="el" href="classExiv2_1_1ValueType.html#725c88fdf395b0dba55c13794b458b69">Exiv2::ValueType< T ></a>. </td>
</tr>
</table>
<a class="anchor" name="6e8f3c20bf5d09f34371660a6cf50af3"></a><!-- doxytag: member="Exiv2::Value::setDataArea" ref="6e8f3c20bf5d09f34371660a6cf50af3" args="(const byte *buf, long len)" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">int Exiv2::Value::setDataArea </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="namespaceExiv2.html#16f60a5bd4207fe155f6cf93a15efa72">byte</a> * </td>
<td class="mdname" nowrap> <em>buf</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>long </td>
<td class="mdname" nowrap> <em>len</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"><code> [virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Set the data area, if the value has one by copying (cloning) the buffer pointed to by buf.
<p>
Values may have a data area, which can contain additional information besides the actual value. This method is used to set such a data area.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>buf</em> </td><td>Pointer to the source data area </td></tr>
<tr><td valign="top"></td><td valign="top"><em>len</em> </td><td>Size of the data area </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>Return -1 if the value has no data area, else 0. </dd></dl>
<p>
Reimplemented in <a class="el" href="classExiv2_1_1ValueType.html#360e7872cfcb434d60bdc09dd243958e">Exiv2::ValueType< T ></a>. </td>
</tr>
</table>
<a class="anchor" name="22d257caa6c1ffe6416ce02de7bd8c1c"></a><!-- doxytag: member="Exiv2::Value::toFloat" ref="22d257caa6c1ffe6416ce02de7bd8c1c" args="(long n=0) const =0" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">virtual float Exiv2::Value::toFloat </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">long </td>
<td class="mdname1" valign="top" nowrap> <em>n</em> = <code>0</code> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const<code> [pure virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Convert the n-th component of the value to a float. The behaviour of this method may be undefined if there is no n-th component.
<p>
<dl compact><dt><b>Returns:</b></dt><dd>The converted value. </dd></dl>
<p>
Implemented in <a class="el" href="classExiv2_1_1DataValue.html#fcde22deccfcd99dba3c0754a0644ca5">Exiv2::DataValue</a>, <a class="el" href="classExiv2_1_1StringValueBase.html#5ebf7bd7e0077ac4ee517f72145fe711">Exiv2::StringValueBase</a>, <a class="el" href="classExiv2_1_1DateValue.html#e569670f2a52546812ca750cc7b1bb69">Exiv2::DateValue</a>, <a class="el" href="classExiv2_1_1TimeValue.html#55da5f33a5dc8e6620cdabe7fbab1dd7">Exiv2::TimeValue</a>, <a class="el" href="classExiv2_1_1ValueType.html#550fc71135aa8491fa7a90f0f682c94d">Exiv2::ValueType< T ></a>, <a class="el" href="classExiv2_1_1ValueType.html#c68f4ac5e10a14ca84bbc9bef0f07cbf">Exiv2::ValueType< T ></a>, and <a class="el" href="classExiv2_1_1ValueType.html#097236490b3429142afc60b6f636f144">Exiv2::ValueType< T ></a>. </td>
</tr>
</table>
<a class="anchor" name="4530a3fc3e2305cf994de5476f46f953"></a><!-- doxytag: member="Exiv2::Value::toLong" ref="4530a3fc3e2305cf994de5476f46f953" args="(long n=0) const =0" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">virtual long Exiv2::Value::toLong </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">long </td>
<td class="mdname1" valign="top" nowrap> <em>n</em> = <code>0</code> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const<code> [pure virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Convert the n-th component of the value to a long. The behaviour of this method may be undefined if there is no n-th component.
<p>
<dl compact><dt><b>Returns:</b></dt><dd>The converted value. </dd></dl>
<p>
Implemented in <a class="el" href="classExiv2_1_1DataValue.html#5f0c7bdb70a0135f5e608d75c75f4642">Exiv2::DataValue</a>, <a class="el" href="classExiv2_1_1StringValueBase.html#14727751ab89f415781402d9f3b087f1">Exiv2::StringValueBase</a>, <a class="el" href="classExiv2_1_1DateValue.html#80ca3538d96fa26f9f196e9db9ff0c43">Exiv2::DateValue</a>, <a class="el" href="classExiv2_1_1TimeValue.html#49250d1f63c75c40b89f1e06860b1ffc">Exiv2::TimeValue</a>, <a class="el" href="classExiv2_1_1ValueType.html#3dea33fa6bb1b9d3bdd1d0a05f0abad0">Exiv2::ValueType< T ></a>, <a class="el" href="classExiv2_1_1ValueType.html#4302aa0e8dee770c7265ed8e1fccb07c">Exiv2::ValueType< T ></a>, and <a class="el" href="classExiv2_1_1ValueType.html#fb8127ff26531236ff5a75232dcc0d84">Exiv2::ValueType< T ></a>. </td>
</tr>
</table>
<a class="anchor" name="595a4cb549bec8c19d290ca3e95a2678"></a><!-- doxytag: member="Exiv2::Value::toRational" ref="595a4cb549bec8c19d290ca3e95a2678" args="(long n=0) const =0" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">virtual <a class="el" href="namespaceExiv2.html#95756f3f7fa19103f83addf5fa088a30">Rational</a> Exiv2::Value::toRational </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">long </td>
<td class="mdname1" valign="top" nowrap> <em>n</em> = <code>0</code> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const<code> [pure virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Convert the n-th component of the value to a Rational. The behaviour of this method may be undefined if there is no n-th component.
<p>
<dl compact><dt><b>Returns:</b></dt><dd>The converted value. </dd></dl>
<p>
Implemented in <a class="el" href="classExiv2_1_1DataValue.html#3cfd0fdecb3db12c6d77c84fa4fe3de6">Exiv2::DataValue</a>, <a class="el" href="classExiv2_1_1StringValueBase.html#d7ffbf58cb0496d3ad4b13e46ee8a29e">Exiv2::StringValueBase</a>, <a class="el" href="classExiv2_1_1DateValue.html#9a4641ab53245fcd36531bcd92e80e32">Exiv2::DateValue</a>, <a class="el" href="classExiv2_1_1TimeValue.html#3db15fd2261fbfce5e369b0e98f8a8ed">Exiv2::TimeValue</a>, <a class="el" href="classExiv2_1_1ValueType.html#20632832dbb186f6ad287456c1b6b92b">Exiv2::ValueType< T ></a>, <a class="el" href="classExiv2_1_1ValueType.html#006d9f9f1ce12f26e14c19dd3ecb3f1f">Exiv2::ValueType< T ></a>, and <a class="el" href="classExiv2_1_1ValueType.html#856a6e80a914e0bbd82dcbdc3f82d24b">Exiv2::ValueType< T ></a>. </td>
</tr>
</table>
<hr>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="value_8hpp.html">value.hpp</a><li>value.cpp</ul>
<hr size="1"><address style="align: right;"><small>Generated on Fri Jun 2 23:55:37 2006 for Exiv2 by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address>
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