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<div class="title">exifcomment.cpp</div>  </div>
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<p>Sample program showing how to set the Exif comment of an image.</p>
<div class="fragment"><div class="line"><span class="comment">// ***************************************************************** -*- C++ -*-</span></div>
<div class="line"><span class="comment">/*</span></div>
<div class="line"><span class="comment">  Abstract : Sample program showing how to set the Exif comment of an image,</span></div>
<div class="line"><span class="comment">             Exif.Photo.UserComment</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">  File:      exifcomment.cpp</span></div>
<div class="line"><span class="comment">  Version  : $Rev: 2286 $</span></div>
<div class="line"><span class="comment">  Author(s): Andreas Huggel (ahu) &lt;ahuggel@gmx.net&gt;</span></div>
<div class="line"><span class="comment">  History  : 10-May-04, ahu: created</span></div>
<div class="line"><span class="comment">             16-Jan-05, ahu: updated using CommentValue and operator trickery</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"><span class="comment">// *****************************************************************************</span></div>
<div class="line"><span class="comment">// included header files</span></div>
<div class="line"><span class="preprocessor">#include &lt;exiv2/exiv2.hpp&gt;</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include &lt;iostream&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;cassert&gt;</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// *****************************************************************************</span></div>
<div class="line"><span class="comment">// Main</span></div>
<div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span>* <span class="keyword">const</span> argv[])</div>
<div class="line"><span class="keyword">try</span> {</div>
<div class="line"></div>
<div class="line">    <span class="keywordflow">if</span> (argc != 2) {</div>
<div class="line">        std::cout &lt;&lt; <span class="stringliteral">&quot;Usage: &quot;</span> &lt;&lt; argv[0] &lt;&lt; <span class="stringliteral">&quot; file\n&quot;</span>;</div>
<div class="line">        <span class="keywordflow">return</span> 1;</div>
<div class="line">    }</div>
<div class="line"></div>
<div class="line">    <a class="code" href="classExiv2_1_1Image.html#a89ad3ffe7a4e8a943d267d77843415fb">Exiv2::Image::AutoPtr</a> image = <a name="a0"></a><a class="code" href="classExiv2_1_1ImageFactory.html#a981013bdf0d31ec7f64f0f6339fe323e">Exiv2::ImageFactory::open</a>(argv[1]);</div>
<div class="line">    assert (image.get() != 0);</div>
<div class="line">    image-&gt;readMetadata();</div>
<div class="line">    <a name="_a1"></a><a class="code" href="classExiv2_1_1ExifData.html">Exiv2::ExifData</a> &amp;exifData = image-&gt;exifData();</div>
<div class="line"></div>
<div class="line">    <span class="comment">/*</span></div>
<div class="line"><span class="comment">      Exiv2 uses a CommentValue for Exif user comments. The format of the</span></div>
<div class="line"><span class="comment">      comment string includes an optional charset specification at the beginning:</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">      [charset=[&quot;]Ascii|Jis|Unicode|Undefined[&quot;] ]comment</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">      Undefined is used as a default if the comment doesn&#39;t start with a charset</span></div>
<div class="line"><span class="comment">      definition.</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">      Following are a few examples of valid comments. The last one is written to</span></div>
<div class="line"><span class="comment">      the file.</span></div>
<div class="line"><span class="comment">     */</span></div>
<div class="line">    exifData[<span class="stringliteral">&quot;Exif.Photo.UserComment&quot;</span>]</div>
<div class="line">        = <span class="stringliteral">&quot;charset=\&quot;Unicode\&quot; An Unicode Exif comment added with Exiv2&quot;</span>;</div>
<div class="line">    exifData[<span class="stringliteral">&quot;Exif.Photo.UserComment&quot;</span>]</div>
<div class="line">        = <span class="stringliteral">&quot;charset=\&quot;Undefined\&quot; An undefined Exif comment added with Exiv2&quot;</span>;</div>
<div class="line">    exifData[<span class="stringliteral">&quot;Exif.Photo.UserComment&quot;</span>]</div>
<div class="line">        = <span class="stringliteral">&quot;Another undefined Exif comment added with Exiv2&quot;</span>;</div>
<div class="line">    exifData[<span class="stringliteral">&quot;Exif.Photo.UserComment&quot;</span>]</div>
<div class="line">        = <span class="stringliteral">&quot;charset=Ascii An ASCII Exif comment added with Exiv2&quot;</span>;</div>
<div class="line"></div>
<div class="line">    std::cout &lt;&lt; <span class="stringliteral">&quot;Writing user comment &#39;&quot;</span></div>
<div class="line">              &lt;&lt; exifData[<span class="stringliteral">&quot;Exif.Photo.UserComment&quot;</span>]</div>
<div class="line">              &lt;&lt; <span class="stringliteral">&quot;&#39; back to the image\n&quot;</span>;</div>
<div class="line"></div>
<div class="line">    image-&gt;writeMetadata();</div>
<div class="line"></div>
<div class="line">    <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"><span class="keywordflow">catch</span> (<a name="_a2"></a><a class="code" href="classExiv2_1_1AnyError.html">Exiv2::AnyError</a>&amp; e) {</div>
<div class="line">    std::cout &lt;&lt; <span class="stringliteral">&quot;Caught Exiv2 exception &#39;&quot;</span> &lt;&lt; e &lt;&lt; <span class="stringliteral">&quot;&#39;\n&quot;</span>;</div>
<div class="line">    <span class="keywordflow">return</span> -1;</div>
<div class="line">}</div>
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