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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Exiv2: Exiv2::Metadatum Class Reference</title>
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<a class="el" href="namespaceExiv2.html">Exiv2</a>::<a class="el" href="classExiv2_1_1Metadatum.html">Metadatum</a></div>
<h1>Exiv2::Metadatum Class Reference</h1><!-- doxytag: class="Exiv2::Metadatum" -->Abstract base class defining the interface to access information related to one metadata tag.
<a href="#_details">More...</a>
<p>
<code>#include <metadatum.hpp></code>
<p>
Inheritance diagram for Exiv2::Metadatum:<p><center><img src="classExiv2_1_1Metadatum__inherit__graph.png" border="0" usemap="#Exiv2_1_1Metadatum__inherit__map" alt="Inheritance graph"></center>
<map name="Exiv2_1_1Metadatum__inherit__map">
<area href="classExiv2_1_1Exifdatum.html" shape="rect" coords="5,81,128,105" alt="">
<area href="classExiv2_1_1Iptcdatum.html" shape="rect" coords="152,81,272,105" alt="">
</map>
<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center><a href="classExiv2_1_1Metadatum-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 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="1d7ef6f699dc1448ddf37c5e8938808a"></a><!-- doxytag: member="Exiv2::Metadatum::Metadatum" ref="1d7ef6f699dc1448ddf37c5e8938808a" args="()" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#1d7ef6f699dc1448ddf37c5e8938808a">Metadatum</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Default Constructor. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="a4b96033393a69d1382570f638d7243b"></a><!-- doxytag: member="Exiv2::Metadatum::Metadatum" ref="a4b96033393a69d1382570f638d7243b" args="(const Metadatum &rhs)" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#a4b96033393a69d1382570f638d7243b">Metadatum</a> (const <a class="el" href="classExiv2_1_1Metadatum.html">Metadatum</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="707ffcc6121daf24e5b191eb55181b35"></a><!-- doxytag: member="Exiv2::Metadatum::~Metadatum" ref="707ffcc6121daf24e5b191eb55181b35" args="()" -->
virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#707ffcc6121daf24e5b191eb55181b35">~Metadatum</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <br></td></tr>
<tr><td colspan="2"><div class="groupHeader">Manipulators</div></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="f4dd21ad1c59ae0bbe521651951615f3"></a><!-- doxytag: member="Exiv2::Metadatum::setValue" ref="f4dd21ad1c59ae0bbe521651951615f3" args="(const Value *pValue)=0" -->
virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#f4dd21ad1c59ae0bbe521651951615f3">setValue</a> (const <a class="el" href="classExiv2_1_1Value.html">Value</a> *pValue)=0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the value. This method copies (clones) the value pointed to by pValue. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="6e2697a6d1564fa32022b2da3d93bcf9"></a><!-- doxytag: member="Exiv2::Metadatum::setValue" ref="6e2697a6d1564fa32022b2da3d93bcf9" args="(const std::string &buf)=0" -->
virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#6e2697a6d1564fa32022b2da3d93bcf9">setValue</a> (const std::string &buf)=0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the value to the string buf. Uses <a class="el" href="classExiv2_1_1Value.html#2864378d7572310aa5f4cf4127365862">Value::read(const std::string& buf)</a>. If the metadatum does not have a value yet, then an <a class="el" href="classExiv2_1_1AsciiValue.html">AsciiValue</a> is created. <br></td></tr>
<tr><td colspan="2"><div class="groupHeader">Accessors</div></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_1Metadatum.html#24bda0168b0655ccbbc8b870b583f1da">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 and return the number of bytes written. <a href="#24bda0168b0655ccbbc8b870b583f1da"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="f9d30791ac19ecd4a80cd9214f3d1495"></a><!-- doxytag: member="Exiv2::Metadatum::key" ref="f9d30791ac19ecd4a80cd9214f3d1495" args="() const =0" -->
virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#f9d30791ac19ecd4a80cd9214f3d1495">key</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the key of the metadatum. The key is of the form 'familyName.ifdItem.tagName'. Note however that the key is not necessarily unique, i.e., an <a class="el" href="classExiv2_1_1ExifData.html">ExifData</a> may contain multiple metadata with the same key. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="828306096c0575ffc5d02c73c3b6ff53"></a><!-- doxytag: member="Exiv2::Metadatum::tagName" ref="828306096c0575ffc5d02c73c3b6ff53" args="() const =0" -->
virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#828306096c0575ffc5d02c73c3b6ff53">tagName</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the name of the tag (which is also the third part of the key). <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="58cd8a22d1debd0e3f8cd2407587ed31"></a><!-- doxytag: member="Exiv2::Metadatum::tagLabel" ref="58cd8a22d1debd0e3f8cd2407587ed31" args="() const =0" -->
virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#58cd8a22d1debd0e3f8cd2407587ed31">tagLabel</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return a label for the tag. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="39ee5937edab29d199f3d318bb55eace"></a><!-- doxytag: member="Exiv2::Metadatum::tag" ref="39ee5937edab29d199f3d318bb55eace" args="() const =0" -->
virtual uint16_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#39ee5937edab29d199f3d318bb55eace">tag</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the tag. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="0f4c5f021786e0e7abc3ae25b984f4e8"></a><!-- doxytag: member="Exiv2::Metadatum::typeId" ref="0f4c5f021786e0e7abc3ae25b984f4e8" args="() const =0" -->
virtual <a class="el" href="namespaceExiv2.html#5153319711f35fe81cbc13f4b852450c">TypeId</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#0f4c5f021786e0e7abc3ae25b984f4e8">typeId</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the type id of the value. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="c3fc08927500d7fe227bc34583815dfe"></a><!-- doxytag: member="Exiv2::Metadatum::typeName" ref="c3fc08927500d7fe227bc34583815dfe" args="() const =0" -->
virtual const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#c3fc08927500d7fe227bc34583815dfe">typeName</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the name of the type. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="1a77c33ee0ba24127dff478e26ba8fa7"></a><!-- doxytag: member="Exiv2::Metadatum::typeSize" ref="1a77c33ee0ba24127dff478e26ba8fa7" args="() const =0" -->
virtual long </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#1a77c33ee0ba24127dff478e26ba8fa7">typeSize</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the size in bytes of one component of this type. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="75740ff36685a69d617e0b9548fcf2b4"></a><!-- doxytag: member="Exiv2::Metadatum::count" ref="75740ff36685a69d617e0b9548fcf2b4" args="() const =0" -->
virtual long </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#75740ff36685a69d617e0b9548fcf2b4">count</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the number of components in the value. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="05e186d6189b44ac428b7d21a8dbc762"></a><!-- doxytag: member="Exiv2::Metadatum::size" ref="05e186d6189b44ac428b7d21a8dbc762" args="() const =0" -->
virtual long </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#05e186d6189b44ac428b7d21a8dbc762">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="8617d2efd0c1a241e96e853b7f00f077"></a><!-- doxytag: member="Exiv2::Metadatum::toString" ref="8617d2efd0c1a241e96e853b7f00f077" args="() const =0" -->
virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#8617d2efd0c1a241e96e853b7f00f077">toString</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the value as a string. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="66148c73f1b565885b4ee51358ae4308"></a><!-- doxytag: member="Exiv2::Metadatum::toLong" ref="66148c73f1b565885b4ee51358ae4308" args="(long n=0) const =0" -->
virtual long </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#66148c73f1b565885b4ee51358ae4308">toLong</a> (long n=0) const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the n-th component of the value converted to long. The return value is -1 if the value of the <a class="el" href="classExiv2_1_1Metadatum.html">Metadatum</a> is not set and the behaviour of the method is undefined if there is no n-th component. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="a70af228d888327badd2333020256ac2"></a><!-- doxytag: member="Exiv2::Metadatum::toFloat" ref="a70af228d888327badd2333020256ac2" args="(long n=0) const =0" -->
virtual float </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#a70af228d888327badd2333020256ac2">toFloat</a> (long n=0) const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the n-th component of the value converted to float. The return value is -1 if the value of the <a class="el" href="classExiv2_1_1Metadatum.html">Metadatum</a> is not set and the behaviour of the method is undefined if there is no n-th component. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ea1935014f316b7a2eabc12be92ca7c9"></a><!-- doxytag: member="Exiv2::Metadatum::toRational" ref="ea1935014f316b7a2eabc12be92ca7c9" args="(long n=0) const =0" -->
virtual <a class="el" href="namespaceExiv2.html#95756f3f7fa19103f83addf5fa088a30">Rational</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#ea1935014f316b7a2eabc12be92ca7c9">toRational</a> (long n=0) const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the n-th component of the value converted to Rational. The return value is -1/1 if the value of the <a class="el" href="classExiv2_1_1Metadatum.html">Metadatum</a> is not set and the behaviour of the method is undefined if there is no n-th component. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="classExiv2_1_1Value.html#0f62e585b82c97738858b743e60dff21">Value::AutoPtr</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#1f3f53ab9df8c213ade42012a7e89ab3">getValue</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return an auto-pointer to a copy (clone) of the value. The caller owns this copy and the auto-poiner ensures that it will be deleted. <a href="#1f3f53ab9df8c213ade42012a7e89ab3"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual const <a class="el" href="classExiv2_1_1Value.html">Value</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#67ab8d2752f951b70a8188341df9c7e6">value</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return a constant reference to the value. <a href="#67ab8d2752f951b70a8188341df9c7e6"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr>
<tr><td colspan="2"><div class="groupHeader">Manipulators</div></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="cb23718131525db38ad4d94f43c73792"></a><!-- doxytag: member="Exiv2::Metadatum::operator=" ref="cb23718131525db38ad4d94f43c73792" args="(const Metadatum &rhs)" -->
<a class="el" href="classExiv2_1_1Metadatum.html">Metadatum</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1Metadatum.html#cb23718131525db38ad4d94f43c73792">operator=</a> (const <a class="el" href="classExiv2_1_1Metadatum.html">Metadatum</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>
Abstract base class defining the interface to access information related to one metadata tag.
<p>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="24bda0168b0655ccbbc8b870b583f1da"></a><!-- doxytag: member="Exiv2::Metadatum::copy" ref="24bda0168b0655ccbbc8b870b583f1da" args="(byte *buf, ByteOrder byteOrder) 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::Metadatum::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 and return the number of bytes written.
<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 characters written. </dd></dl>
<p>
Implemented in <a class="el" href="classExiv2_1_1Exifdatum.html#28391f10f14d66cabeb8042853e311cd">Exiv2::Exifdatum</a>, and <a class="el" href="classExiv2_1_1Iptcdatum.html#fef33191871750f8b1c760d46f553c51">Exiv2::Iptcdatum</a>. </td>
</tr>
</table>
<a class="anchor" name="1f3f53ab9df8c213ade42012a7e89ab3"></a><!-- doxytag: member="Exiv2::Metadatum::getValue" ref="1f3f53ab9df8c213ade42012a7e89ab3" args="() const =0" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
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<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top">virtual <a class="el" href="classExiv2_1_1Value.html#0f62e585b82c97738858b743e60dff21">Value::AutoPtr</a> Exiv2::Metadatum::getValue </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> [pure virtual]</code></td>
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<p>
Return an auto-pointer to a copy (clone) of the value. The caller owns this copy and the auto-poiner ensures that it will be deleted.
<p>
This method is provided for users who need full control over the value. A caller may, e.g., downcast the pointer to the appropriate subclass of <a class="el" href="classExiv2_1_1Value.html">Value</a> to make use of the interface of the subclass to set or modify its contents.<p>
<dl compact><dt><b>Returns:</b></dt><dd>An auto-pointer containing a pointer to a copy (clone) of the value, 0 if the value is not set. </dd></dl>
<p>
Implemented in <a class="el" href="classExiv2_1_1Exifdatum.html#69fee053db7f4e55295f7ff1c4d34566">Exiv2::Exifdatum</a>, and <a class="el" href="classExiv2_1_1Iptcdatum.html#dde9e41e4fda8d1cd9e5947e44cbf40a">Exiv2::Iptcdatum</a>. </td>
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<a class="anchor" name="67ab8d2752f951b70a8188341df9c7e6"></a><!-- doxytag: member="Exiv2::Metadatum::value" ref="67ab8d2752f951b70a8188341df9c7e6" args="() const =0" --><p>
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<td class="md" nowrap valign="top">virtual const <a class="el" href="classExiv2_1_1Value.html">Value</a>& Exiv2::Metadatum::value </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> [pure virtual]</code></td>
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<p>
Return a constant reference to the value.
<p>
This method is provided mostly for convenient and versatile output of the value which can (to some extent) be formatted through standard stream manipulators. Do not attempt to write to the value through this reference.<p>
<b>Example:</b> <br>
<div class="fragment"><pre class="fragment"> <a class="code" href="classExiv2_1_1ExifData.html#2b8ac7a474d6527c0f3f6a0a9cebef77">ExifData::const_iterator</a> i = exifData.findKey(<a class="code" href="classExiv2_1_1Metadatum.html#f9d30791ac19ecd4a80cd9214f3d1495">key</a>);
<span class="keywordflow">if</span> (i != exifData.end()) {
std::cout << i->key() << <span class="stringliteral">" "</span> << std::hex << i->value() << <span class="stringliteral">"\n"</span>;
}
</pre></div><p>
<dl compact><dt><b>Returns:</b></dt><dd>A constant reference to the value. </dd></dl>
<dl compact><dt><b>Exceptions:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em><a class="el" href="classExiv2_1_1Error.html">Error</a></em> </td><td>if the value is not set. </td></tr>
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</dl>
<p>
Implemented in <a class="el" href="classExiv2_1_1Exifdatum.html#44d8261179011b2f68075d805e565866">Exiv2::Exifdatum</a>, and <a class="el" href="classExiv2_1_1Iptcdatum.html#799184a3a000bda2432a0b7366c2dfb2">Exiv2::Iptcdatum</a>. </td>
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<hr>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="metadatum_8hpp.html">metadatum.hpp</a><li>metadatum.cpp</ul>
<hr size="1"><address style="align: right;"><small>Generated on Fri Jun 2 23:55:12 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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