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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Exiv2: Exiv2::JpegBase Class Reference</title>
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<a class="el" href="namespaceExiv2.html">Exiv2</a>::<a class="el" href="classExiv2_1_1JpegBase.html">JpegBase</a></div>
<h1>Exiv2::JpegBase Class Reference</h1><!-- doxytag: class="Exiv2::JpegBase" --><!-- doxytag: inherits="Exiv2::Image" -->Abstract helper base class to access JPEG images.
<a href="#_details">More...</a>
<p>
<code>#include <jpgimage.hpp></code>
<p>
Inheritance diagram for Exiv2::JpegBase:<p><center><img src="classExiv2_1_1JpegBase__inherit__graph.png" border="0" usemap="#Exiv2_1_1JpegBase__inherit__map" alt="Inheritance graph"></center>
<map name="Exiv2_1_1JpegBase__inherit__map">
<area href="classExiv2_1_1ExvImage.html" shape="rect" coords="5,156,128,180" alt="">
<area href="classExiv2_1_1JpegImage.html" shape="rect" coords="152,156,280,180" alt="">
<area href="classExiv2_1_1Image.html" shape="rect" coords="92,7,191,31" alt="">
</map>
<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center>Collaboration diagram for Exiv2::JpegBase:<p><center><img src="classExiv2_1_1JpegBase__coll__graph.png" border="0" usemap="#Exiv2_1_1JpegBase__coll__map" alt="Collaboration graph"></center>
<map name="Exiv2_1_1JpegBase__coll__map">
<area href="classExiv2_1_1Image.html" shape="rect" coords="129,348,228,372" alt="">
<area href="classExiv2_1_1ExifData.html" shape="rect" coords="357,348,469,372" alt="">
<area href="classExiv2_1_1MakerNote.html" shape="rect" coords="91,199,219,223" alt="">
<area href="classExiv2_1_1Ifd.html" shape="rect" coords="523,199,600,223" alt="">
<area href="classExiv2_1_1IptcData.html" shape="rect" coords="5,273,117,297" alt="">
<area href="classExiv2_1_1TiffHeader.html" shape="rect" coords="243,199,365,223" alt="">
</map>
<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center><a href="classExiv2_1_1JpegBase-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="0b102ca7dfa24f7994f6df2f52142ebd"></a><!-- doxytag: member="Exiv2::JpegBase::~JpegBase" ref="0b102ca7dfa24f7994f6df2f52142ebd" args="()" -->
virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#0b102ca7dfa24f7994f6df2f52142ebd">~JpegBase</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">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#d6e281a6e5e863c93fbb123f0b38bc4c">readMetadata</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Read all metadata supported by a specific image format from the image. Before this method is called, the various metadata types will be empty. <a href="#d6e281a6e5e863c93fbb123f0b38bc4c"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Write metadata back to the image. <a href="#5e17357e701288db323db2bb5c9db1a9"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#edea65721335f3935f915732a2cebb95">setExifData</a> (const <a class="el" href="classExiv2_1_1ExifData.html">ExifData</a> &exifData)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Assign new exif data. The new exif data is not written to the image until the <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> method is called. <a href="#edea65721335f3935f915732a2cebb95"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="de107491ffc2c964d531a0ebca6c24a0"></a><!-- doxytag: member="Exiv2::JpegBase::clearExifData" ref="de107491ffc2c964d531a0ebca6c24a0" args="()" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#de107491ffc2c964d531a0ebca6c24a0">clearExifData</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Erase any buffered Exif data. Exif data is not removed from the actual image until the <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> method is called. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#cd0185888d2779108e5aa5fe8640c248">setIptcData</a> (const <a class="el" href="classExiv2_1_1IptcData.html">IptcData</a> &iptcData)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Assign new iptc data. The new iptc data is not written to the image until the <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> method is called. <a href="#cd0185888d2779108e5aa5fe8640c248"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="a64552b1267efc4dfb7ff6e385f577b8"></a><!-- doxytag: member="Exiv2::JpegBase::clearIptcData" ref="a64552b1267efc4dfb7ff6e385f577b8" args="()" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#a64552b1267efc4dfb7ff6e385f577b8">clearIptcData</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Erase any buffered Iptc data. Iptc data is not removed from the actual image until the <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> method is called. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#e0b819e52bc1526713f500f8b6e78fd3">setComment</a> (const std::string &comment)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the image comment. The new comment is not written to the image until the <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> method is called. <a href="#e0b819e52bc1526713f500f8b6e78fd3"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="67c48ce80fcbcd06698acf5a2ae74109"></a><!-- doxytag: member="Exiv2::JpegBase::clearComment" ref="67c48ce80fcbcd06698acf5a2ae74109" args="()" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#67c48ce80fcbcd06698acf5a2ae74109">clearComment</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Erase any buffered comment. Comment is not removed from the actual image until the <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> method is called. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#148899238ae4a3cd27a1ddd9395f276a">setMetadata</a> (const <a class="el" href="classExiv2_1_1Image.html">Image</a> &image)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Copy all existing metadata from source <a class="el" href="classExiv2_1_1Image.html">Image</a>. The data is copied into internal buffers and is not written to the image until the <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> method is called. <a href="#148899238ae4a3cd27a1ddd9395f276a"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="af8cadf73e32278332b025d31221086f"></a><!-- doxytag: member="Exiv2::JpegBase::clearMetadata" ref="af8cadf73e32278332b025d31221086f" args="()" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#af8cadf73e32278332b025d31221086f">clearMetadata</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Erase all buffered metadata. Metadata is not removed from the actual image until the <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> method is called. <br></td></tr>
<tr><td colspan="2"><div class="groupHeader">Accessors</div></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#0c44e78e8fd0fdbc403c3a91b4034728">good</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Check if the <a class="el" href="classExiv2_1_1Image.html">Image</a> instance is valid. Use after object construction. <a href="#0c44e78e8fd0fdbc403c3a91b4034728"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const <a class="el" href="classExiv2_1_1ExifData.html">ExifData</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#bf4d6221df17f720109c56ff771567b9">exifData</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns an <a class="el" href="classExiv2_1_1ExifData.html">ExifData</a> instance containing currently buffered Exif data. <a href="#bf4d6221df17f720109c56ff771567b9"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classExiv2_1_1ExifData.html">ExifData</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#5ea98e99d1a1542cbb6916a0b30199a8">exifData</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns an <a class="el" href="classExiv2_1_1ExifData.html">ExifData</a> instance containing currently buffered Exif data. <a href="#5ea98e99d1a1542cbb6916a0b30199a8"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const <a class="el" href="classExiv2_1_1IptcData.html">IptcData</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#c692fedf57ecdc281dcc5f8e7dd66c63">iptcData</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns an <a class="el" href="classExiv2_1_1IptcData.html">IptcData</a> instance containing currently buffered Iptc data. <a href="#c692fedf57ecdc281dcc5f8e7dd66c63"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classExiv2_1_1IptcData.html">IptcData</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#63d93a092014db3c93fae4a2ba70cb0d">iptcData</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns an <a class="el" href="classExiv2_1_1IptcData.html">IptcData</a> instance containing currently buffered Iptc data. <a href="#63d93a092014db3c93fae4a2ba70cb0d"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="c57633142bf37dc42caa307f752cfc11"></a><!-- doxytag: member="Exiv2::JpegBase::comment" ref="c57633142bf37dc42caa307f752cfc11" args="() const " -->
std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#c57633142bf37dc42caa307f752cfc11">comment</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return a copy of the image comment. May be an empty string. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#32f48495ddfadaa1250fb4303fc77765">io</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return a reference to the <a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> instance being used for Io. <a href="#32f48495ddfadaa1250fb4303fc77765"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Protected 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"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#85c9ad6724234fb3be93b964abcebd26">JpegBase</a> (<a class="el" href="classExiv2_1_1BasicIo.html#f8f989522925b884d8c9d3a257265fa1">BasicIo::AutoPtr</a> io, bool create, const <a class="el" href="namespaceExiv2.html#16f60a5bd4207fe155f6cf93a15efa72">byte</a> initData[], long dataSize)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Constructor that can either open an existing image or create a new image from scratch. If a new image is to be created, any existing data is overwritten. <a href="#85c9ad6724234fb3be93b964abcebd26"></a><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_1JpegBase.html#17bc2fe8a8e2562ae18d220e695cf2bf">writeHeader</a> (<a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> &oIo) const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Writes the image header (aka signature) to the <a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> instance. <a href="#17bc2fe8a8e2562ae18d220e695cf2bf"></a><br></td></tr>
<tr><td colspan="2"><div class="groupHeader">Accessors</div></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#ad464a055fd28f2f0e9f99af3967f208">isThisType</a> (<a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> &iIo, bool advance) const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Determine if the content of the <a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> instance is of the type supported by this class. <a href="#ad464a055fd28f2f0e9f99af3967f208"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Static Protected Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="b8438f038796a4098cfac9f455af4cbc"></a><!-- doxytag: member="Exiv2::JpegBase::sos_" ref="b8438f038796a4098cfac9f455af4cbc" args="" -->
static const <a class="el" href="namespaceExiv2.html#16f60a5bd4207fe155f6cf93a15efa72">byte</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#b8438f038796a4098cfac9f455af4cbc">sos_</a> = 0xda</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">JPEG SOS marker. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ef78301f5a5c1eb10ede0a0aed95dd8b"></a><!-- doxytag: member="Exiv2::JpegBase::eoi_" ref="ef78301f5a5c1eb10ede0a0aed95dd8b" args="" -->
static const <a class="el" href="namespaceExiv2.html#16f60a5bd4207fe155f6cf93a15efa72">byte</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#ef78301f5a5c1eb10ede0a0aed95dd8b">eoi_</a> = 0xd9</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">JPEG EOI marker. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="10bf3ed1d94e6eb152e224bcf68a2817"></a><!-- doxytag: member="Exiv2::JpegBase::app0_" ref="10bf3ed1d94e6eb152e224bcf68a2817" args="" -->
static const <a class="el" href="namespaceExiv2.html#16f60a5bd4207fe155f6cf93a15efa72">byte</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#10bf3ed1d94e6eb152e224bcf68a2817">app0_</a> = 0xe0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">JPEG APP0 marker. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="82f4bb5005543aa0ebe1c74ef739bdb7"></a><!-- doxytag: member="Exiv2::JpegBase::app1_" ref="82f4bb5005543aa0ebe1c74ef739bdb7" args="" -->
static const <a class="el" href="namespaceExiv2.html#16f60a5bd4207fe155f6cf93a15efa72">byte</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#82f4bb5005543aa0ebe1c74ef739bdb7">app1_</a> = 0xe1</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">JPEG APP1 marker. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="f7702e1a0b0077f037d69d90a25c47d0"></a><!-- doxytag: member="Exiv2::JpegBase::app13_" ref="f7702e1a0b0077f037d69d90a25c47d0" args="" -->
static const <a class="el" href="namespaceExiv2.html#16f60a5bd4207fe155f6cf93a15efa72">byte</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#f7702e1a0b0077f037d69d90a25c47d0">app13_</a> = 0xed</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">JPEG APP13 marker. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="19f8416e44728f5dc7a18a5a1e847386"></a><!-- doxytag: member="Exiv2::JpegBase::com_" ref="19f8416e44728f5dc7a18a5a1e847386" args="" -->
static const <a class="el" href="namespaceExiv2.html#16f60a5bd4207fe155f6cf93a15efa72">byte</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#19f8416e44728f5dc7a18a5a1e847386">com_</a> = 0xfe</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">JPEG Comment marker. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="973fc83e77fc1a20d3ebe014a7659a5c"></a><!-- doxytag: member="Exiv2::JpegBase::exifId_" ref="973fc83e77fc1a20d3ebe014a7659a5c" args="[]" -->
static const char </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#973fc83e77fc1a20d3ebe014a7659a5c">exifId_</a> [] = "Exif\0\0"</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Exif identifier. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="06f050f91fac7a06b93550d2992e4511"></a><!-- doxytag: member="Exiv2::JpegBase::jfifId_" ref="06f050f91fac7a06b93550d2992e4511" args="[]" -->
static const char </td><td class="memItemRight" valign="bottom"><a class="el" href="classExiv2_1_1JpegBase.html#06f050f91fac7a06b93550d2992e4511">jfifId_</a> [] = "JFIF\0"</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">JFIF identifier. <br></td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
Abstract helper base class to access JPEG images.
<p>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="85c9ad6724234fb3be93b964abcebd26"></a><!-- doxytag: member="Exiv2::JpegBase::JpegBase" ref="85c9ad6724234fb3be93b964abcebd26" args="(BasicIo::AutoPtr io, bool create, const byte initData[], long dataSize)" --><p>
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<td class="md" nowrap valign="top">Exiv2::JpegBase::JpegBase </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="classExiv2_1_1BasicIo.html#f8f989522925b884d8c9d3a257265fa1">BasicIo::AutoPtr</a> </td>
<td class="mdname" nowrap> <em>io</em>, </td>
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<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>bool </td>
<td class="mdname" nowrap> <em>create</em>, </td>
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<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const <a class="el" href="namespaceExiv2.html#16f60a5bd4207fe155f6cf93a15efa72">byte</a> </td>
<td class="mdname" nowrap> <em>initData</em>[], </td>
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<td class="md" nowrap align="right"></td>
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<td class="md" nowrap>long </td>
<td class="mdname" nowrap> <em>dataSize</em></td>
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<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"><code> [protected]</code></td>
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<p>
Constructor that can either open an existing image or create a new image from scratch. If a new image is to be created, any existing data is overwritten.
<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>io</em> </td><td>An auto-pointer that owns a <a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> instance used for reading and writing image metadata. <b>Important:</b> The constructor takes ownership of the passed in <a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> instance through the auto-pointer. Callers should not continue to use the <a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> instance after it is passed to this method. Use the <a class="el" href="classExiv2_1_1Image.html#bf0ec3095733c0dfb73ba1bb4a19591e">Image::io()</a> method to get a temporary reference. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>create</em> </td><td>Specifies if an existing image should be read (false) or if a new image should be created (true). </td></tr>
<tr><td valign="top"></td><td valign="top"><em>initData</em> </td><td>Data to initialize newly created images. Only used when <em>create</em> is true. Should contain data for the smallest valid image of the calling subclass. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>dataSize</em> </td><td>Size of initData in bytes. </td></tr>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="5ea98e99d1a1542cbb6916a0b30199a8"></a><!-- doxytag: member="Exiv2::JpegBase::exifData" ref="5ea98e99d1a1542cbb6916a0b30199a8" args="()" --><p>
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<td class="md" nowrap valign="top"><a class="el" href="classExiv2_1_1ExifData.html">ExifData</a>& Exiv2::JpegBase::exifData </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [inline, virtual]</code></td>
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<p>
Returns an <a class="el" href="classExiv2_1_1ExifData.html">ExifData</a> instance containing currently buffered Exif data.
<p>
The contained Exif data may have been read from the image by a previous call to <a class="el" href="classExiv2_1_1JpegBase.html#d6e281a6e5e863c93fbb123f0b38bc4c">readMetadata()</a> or added directly. The Exif data in the returned instance will be written to the image when <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> is called.<p>
<dl compact><dt><b>Returns:</b></dt><dd>modifiable <a class="el" href="classExiv2_1_1ExifData.html">ExifData</a> instance containing Exif values </dd></dl>
<p>
Implements <a class="el" href="classExiv2_1_1Image.html#00aac55e2f1506d1857ff1581a4e294f">Exiv2::Image</a>. </td>
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<a class="anchor" name="bf4d6221df17f720109c56ff771567b9"></a><!-- doxytag: member="Exiv2::JpegBase::exifData" ref="bf4d6221df17f720109c56ff771567b9" args="() const " --><p>
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<td class="md" nowrap valign="top">const <a class="el" href="classExiv2_1_1ExifData.html">ExifData</a>& Exiv2::JpegBase::exifData </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>
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<p>
Returns an <a class="el" href="classExiv2_1_1ExifData.html">ExifData</a> instance containing currently buffered Exif data.
<p>
The Exif data may have been read from the image by a previous call to <a class="el" href="classExiv2_1_1JpegBase.html#d6e281a6e5e863c93fbb123f0b38bc4c">readMetadata()</a> or added directly. The Exif data in the returned instance will be written to the image when <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> is called.<p>
<dl compact><dt><b>Returns:</b></dt><dd>read only <a class="el" href="classExiv2_1_1ExifData.html">ExifData</a> instance containing Exif values </dd></dl>
<p>
Implements <a class="el" href="classExiv2_1_1Image.html#74eddd9a561cfce47938cbef0f435409">Exiv2::Image</a>. </td>
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<a class="anchor" name="0c44e78e8fd0fdbc403c3a91b4034728"></a><!-- doxytag: member="Exiv2::JpegBase::good" ref="0c44e78e8fd0fdbc403c3a91b4034728" args="() const " --><p>
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<td class="md" nowrap valign="top">bool Exiv2::JpegBase::good </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> [virtual]</code></td>
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<p>
Check if the <a class="el" href="classExiv2_1_1Image.html">Image</a> instance is valid. Use after object construction.
<p>
<dl compact><dt><b>Returns:</b></dt><dd>true if the <a class="el" href="classExiv2_1_1Image.html">Image</a> is in a valid state. </dd></dl>
<p>
Implements <a class="el" href="classExiv2_1_1Image.html#510071a51f8ad92126613aecf63c4083">Exiv2::Image</a>. </td>
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<a class="anchor" name="32f48495ddfadaa1250fb4303fc77765"></a><!-- doxytag: member="Exiv2::JpegBase::io" ref="32f48495ddfadaa1250fb4303fc77765" args="() const " --><p>
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<td class="md" nowrap valign="top"><a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a>& Exiv2::JpegBase::io </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>
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<p>
Return a reference to the <a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> instance being used for Io.
<p>
This refence is particularly useful to reading the results of operations on a <a class="el" href="classExiv2_1_1MemIo.html">MemIo</a> instance. For example after metadata has been modified and the <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> method has been called, this method can be used to get access to the modified image.<p>
<dl compact><dt><b>Returns:</b></dt><dd><a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> instance that can be used to read or write image data directly. </dd></dl>
<dl compact><dt><b>Note:</b></dt><dd>If the returned <a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> is used to write to the image, the <a class="el" href="classExiv2_1_1Image.html">Image</a> class will not see those changes until the <a class="el" href="classExiv2_1_1JpegBase.html#d6e281a6e5e863c93fbb123f0b38bc4c">readMetadata()</a> method is called. </dd></dl>
<p>
Implements <a class="el" href="classExiv2_1_1Image.html#bf0ec3095733c0dfb73ba1bb4a19591e">Exiv2::Image</a>. </td>
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<a class="anchor" name="63d93a092014db3c93fae4a2ba70cb0d"></a><!-- doxytag: member="Exiv2::JpegBase::iptcData" ref="63d93a092014db3c93fae4a2ba70cb0d" args="()" --><p>
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<td class="md" nowrap valign="top"><a class="el" href="classExiv2_1_1IptcData.html">IptcData</a>& Exiv2::JpegBase::iptcData </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [inline, virtual]</code></td>
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<p>
Returns an <a class="el" href="classExiv2_1_1IptcData.html">IptcData</a> instance containing currently buffered Iptc data.
<p>
The contained Iptc data may have been read from the image by a previous call to <a class="el" href="classExiv2_1_1JpegBase.html#d6e281a6e5e863c93fbb123f0b38bc4c">readMetadata()</a> or added directly. The Iptc data in the returned instance will be written to the image when <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> is called.<p>
<dl compact><dt><b>Returns:</b></dt><dd>modifiable <a class="el" href="classExiv2_1_1IptcData.html">IptcData</a> instance containing Iptc values </dd></dl>
<p>
Implements <a class="el" href="classExiv2_1_1Image.html#78a96436bf818412c897193293e6989e">Exiv2::Image</a>. </td>
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<a class="anchor" name="c692fedf57ecdc281dcc5f8e7dd66c63"></a><!-- doxytag: member="Exiv2::JpegBase::iptcData" ref="c692fedf57ecdc281dcc5f8e7dd66c63" args="() const " --><p>
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<td class="md" nowrap valign="top">const <a class="el" href="classExiv2_1_1IptcData.html">IptcData</a>& Exiv2::JpegBase::iptcData </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>
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<p>
Returns an <a class="el" href="classExiv2_1_1IptcData.html">IptcData</a> instance containing currently buffered Iptc data.
<p>
The contained Iptc data may have been read from the image by a previous call to <a class="el" href="classExiv2_1_1JpegBase.html#d6e281a6e5e863c93fbb123f0b38bc4c">readMetadata()</a> or added directly. The Iptc data in the returned instance will be written to the image when <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> is called.<p>
<dl compact><dt><b>Returns:</b></dt><dd>modifiable <a class="el" href="classExiv2_1_1IptcData.html">IptcData</a> instance containing Iptc values </dd></dl>
<p>
Implements <a class="el" href="classExiv2_1_1Image.html#0964445fda34268c3cadbb8bcc669a2f">Exiv2::Image</a>. </td>
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<a class="anchor" name="ad464a055fd28f2f0e9f99af3967f208"></a><!-- doxytag: member="Exiv2::JpegBase::isThisType" ref="ad464a055fd28f2f0e9f99af3967f208" args="(BasicIo &iIo, bool advance) const =0" --><p>
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<td class="md" nowrap valign="top">virtual bool Exiv2::JpegBase::isThisType </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> & </td>
<td class="mdname" nowrap> <em>iIo</em>, </td>
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<td class="md" nowrap align="right"></td>
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<td class="md" nowrap>bool </td>
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<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"> const<code> [protected, pure virtual]</code></td>
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<p>
Determine if the content of the <a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> instance is of the type supported by this class.
<p>
The advance flag determines if the read position in the stream is moved (see below). This applies only if the type matches and the function returns true. If the type does not match, the stream position is not changed. However, if reading from the stream fails, the stream position is undefined. Consult the stream state to obtain more information in this case.<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>iIo</em> </td><td><a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> instance to read from. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>advance</em> </td><td>Flag indicating whether the position of the io should be advanced by the number of characters read to analyse the data (true) or left at its original position (false). This applies only if the type matches. </td></tr>
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</dl>
<dl compact><dt><b>Returns:</b></dt><dd>true if the data matches the type of this class;<br>
false if the data does not match </dd></dl>
<p>
Implemented in <a class="el" href="classExiv2_1_1JpegImage.html#5a1d72c08c64f28afd557500c6f78f0a">Exiv2::JpegImage</a>, and <a class="el" href="classExiv2_1_1ExvImage.html#480b16cd980735218d8fb8c4e7ad19c6">Exiv2::ExvImage</a>. </td>
</tr>
</table>
<a class="anchor" name="d6e281a6e5e863c93fbb123f0b38bc4c"></a><!-- doxytag: member="Exiv2::JpegBase::readMetadata" ref="d6e281a6e5e863c93fbb123f0b38bc4c" args="()" --><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">void Exiv2::JpegBase::readMetadata </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Read all metadata supported by a specific image format from the image. Before this method is called, the various metadata types will be empty.
<p>
This method returns success even if no metadata is found in the image. Callers must therefore check the size of individual metadata types before accessing the data.<p>
<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 opening or reading of the file fails or the image data is not valid (does not look like data of the specific image type). </td></tr>
</table>
</dl>
<p>
Implements <a class="el" href="classExiv2_1_1Image.html#198b8d5924d6441748aa162130c96a5f">Exiv2::Image</a>. </td>
</tr>
</table>
<a class="anchor" name="e0b819e52bc1526713f500f8b6e78fd3"></a><!-- doxytag: member="Exiv2::JpegBase::setComment" ref="e0b819e52bc1526713f500f8b6e78fd3" args="(const std::string &comment)" --><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">void Exiv2::JpegBase::setComment </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const std::string & </td>
<td class="mdname1" valign="top" nowrap> <em>comment</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Set the image comment. The new comment is not written to the image until the <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> method is called.
<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>comment</em> </td><td>String containing comment. </td></tr>
</table>
</dl>
<p>
Implements <a class="el" href="classExiv2_1_1Image.html#87770eed464e26deb837b247583e7bff">Exiv2::Image</a>. </td>
</tr>
</table>
<a class="anchor" name="edea65721335f3935f915732a2cebb95"></a><!-- doxytag: member="Exiv2::JpegBase::setExifData" ref="edea65721335f3935f915732a2cebb95" args="(const ExifData &exifData)" --><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">void Exiv2::JpegBase::setExifData </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="classExiv2_1_1ExifData.html">ExifData</a> & </td>
<td class="mdname1" valign="top" nowrap> <em>exifData</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Assign new exif data. The new exif data is not written to the image until the <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> method is called.
<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>exifData</em> </td><td>An <a class="el" href="classExiv2_1_1ExifData.html">ExifData</a> instance holding exif data to be copied </td></tr>
</table>
</dl>
<p>
Implements <a class="el" href="classExiv2_1_1Image.html#2fc96717f69970969b1acb32288b3773">Exiv2::Image</a>. </td>
</tr>
</table>
<a class="anchor" name="cd0185888d2779108e5aa5fe8640c248"></a><!-- doxytag: member="Exiv2::JpegBase::setIptcData" ref="cd0185888d2779108e5aa5fe8640c248" args="(const IptcData &iptcData)" --><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">void Exiv2::JpegBase::setIptcData </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="classExiv2_1_1IptcData.html">IptcData</a> & </td>
<td class="mdname1" valign="top" nowrap> <em>iptcData</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Assign new iptc data. The new iptc data is not written to the image until the <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> method is called.
<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>iptcData</em> </td><td>An <a class="el" href="classExiv2_1_1IptcData.html">IptcData</a> instance holding iptc data to be copied </td></tr>
</table>
</dl>
<p>
Implements <a class="el" href="classExiv2_1_1Image.html#91670116c851b2c4392727107d9610ef">Exiv2::Image</a>. </td>
</tr>
</table>
<a class="anchor" name="148899238ae4a3cd27a1ddd9395f276a"></a><!-- doxytag: member="Exiv2::JpegBase::setMetadata" ref="148899238ae4a3cd27a1ddd9395f276a" args="(const Image &image)" --><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">void Exiv2::JpegBase::setMetadata </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="classExiv2_1_1Image.html">Image</a> & </td>
<td class="mdname1" valign="top" nowrap> <em>image</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Copy all existing metadata from source <a class="el" href="classExiv2_1_1Image.html">Image</a>. The data is copied into internal buffers and is not written to the image until the <a class="el" href="classExiv2_1_1JpegBase.html#5e17357e701288db323db2bb5c9db1a9">writeMetadata()</a> method is called.
<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>image</em> </td><td>Metadata source. All metadata types are copied. </td></tr>
</table>
</dl>
<p>
Implements <a class="el" href="classExiv2_1_1Image.html#5f27b147ba83e48d8b732b3b8aea9ebc">Exiv2::Image</a>. </td>
</tr>
</table>
<a class="anchor" name="17bc2fe8a8e2562ae18d220e695cf2bf"></a><!-- doxytag: member="Exiv2::JpegBase::writeHeader" ref="17bc2fe8a8e2562ae18d220e695cf2bf" args="(BasicIo &oIo) 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 int Exiv2::JpegBase::writeHeader </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> & </td>
<td class="mdname1" valign="top" nowrap> <em>oIo</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const<code> [protected, pure virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Writes the image header (aka signature) to the <a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> instance.
<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>oIo</em> </td><td><a class="el" href="classExiv2_1_1BasicIo.html">BasicIo</a> instance that the header is written to. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>0 if successful;<br>
4 if the output file can not be written to </dd></dl>
<p>
Implemented in <a class="el" href="classExiv2_1_1JpegImage.html#8a3082eb94f566db8b52ae5dfd80754d">Exiv2::JpegImage</a>, and <a class="el" href="classExiv2_1_1ExvImage.html#c8d38bdde6a43d90e9c5d8ec1eacc7b0">Exiv2::ExvImage</a>. </td>
</tr>
</table>
<a class="anchor" name="5e17357e701288db323db2bb5c9db1a9"></a><!-- doxytag: member="Exiv2::JpegBase::writeMetadata" ref="5e17357e701288db323db2bb5c9db1a9" args="()" --><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">void Exiv2::JpegBase::writeMetadata </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Write metadata back to the image.
<p>
All existing metadata sections in the image are either created, replaced, or erased. If values for a given metadata type have been assigned, a section for that metadata type will either be created or replaced. If no values have been assigned to a given metadata type, any exists section for that metadata type will be removed from the image.<p>
<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 operation fails </td></tr>
</table>
</dl>
<p>
Implements <a class="el" href="classExiv2_1_1Image.html#f9f7e86aac2f656473e456e16550ab58">Exiv2::Image</a>. </td>
</tr>
</table>
<hr>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="jpgimage_8hpp.html">jpgimage.hpp</a><li>jpgimage.cpp</ul>
<hr size="1"><address style="align: right;"><small>Generated on Fri Jun 2 23:55:01 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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