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<h1>exifcomment.cpp</h1>Sample program showing how to set the Exif comment of an image.<p>
<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// ***************************************************************** -*- C++ -*-</span>
<a name="l00002"></a>00002 <span class="comment">/*</span>
<a name="l00003"></a>00003 <span class="comment"> Abstract : Sample program showing how to set the Exif comment of an image,</span>
<a name="l00004"></a>00004 <span class="comment"> Exif.Photo.UserComment</span>
<a name="l00005"></a>00005 <span class="comment"></span>
<a name="l00006"></a>00006 <span class="comment"> File: exifcomment.cpp</span>
<a name="l00007"></a>00007 <span class="comment"> Version : $Rev: 631 $</span>
<a name="l00008"></a>00008 <span class="comment"> Author(s): Andreas Huggel (ahu) <ahuggel@gmx.net></span>
<a name="l00009"></a>00009 <span class="comment"> History : 10-May-04, ahu: created</span>
<a name="l00010"></a>00010 <span class="comment"> 16-Jan-05, ahu: updated using CommentValue and operator trickery</span>
<a name="l00011"></a>00011 <span class="comment"> */</span>
<a name="l00012"></a>00012 <span class="comment">// *****************************************************************************</span>
<a name="l00013"></a>00013 <span class="comment">// included header files</span>
<a name="l00014"></a>00014 <span class="preprocessor">#include "<a class="code" href="image_8hpp.html">image.hpp</a>"</span>
<a name="l00015"></a>00015 <span class="preprocessor">#include "<a class="code" href="exif_8hpp.html">exif.hpp</a>"</span>
<a name="l00016"></a>00016 <span class="preprocessor">#include <iostream></span>
<a name="l00017"></a>00017 <span class="preprocessor">#include <cassert></span>
<a name="l00018"></a>00018
<a name="l00019"></a>00019 <span class="comment">// *****************************************************************************</span>
<a name="l00020"></a>00020 <span class="comment">// Main</span>
<a name="l00021"></a>00021 <span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span>* <span class="keyword">const</span> argv[])
<a name="l00022"></a>00022 <span class="keyword">try</span> {
<a name="l00023"></a>00023
<a name="l00024"></a>00024 <span class="keywordflow">if</span> (argc != 2) {
<a name="l00025"></a>00025 std::cout << <span class="stringliteral">"Usage: "</span> << argv[0] << <span class="stringliteral">" file\n"</span>;
<a name="l00026"></a>00026 <span class="keywordflow">return</span> 1;
<a name="l00027"></a>00027 }
<a name="l00028"></a>00028
<a name="l00029"></a>00029 <a class="code" href="classExiv2_1_1Image.html#89ad3ffe7a4e8a943d267d77843415fb">Exiv2::Image::AutoPtr</a> image = <a name="a18"></a><a class="code" href="classExiv2_1_1ImageFactory.html#981013bdf0d31ec7f64f0f6339fe323e">Exiv2::ImageFactory::open</a>(argv[1]);
<a name="l00030"></a>00030 assert (image.get() != 0);
<a name="l00031"></a>00031 image->readMetadata();
<a name="l00032"></a>00032 <a name="_a19"></a><a class="code" href="classExiv2_1_1ExifData.html">Exiv2::ExifData</a> &exifData = image->exifData();
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="comment">/*</span>
<a name="l00035"></a>00035 <span class="comment"> Exiv2 uses a CommentValue for Exif user comments. The format of the</span>
<a name="l00036"></a>00036 <span class="comment"> comment string includes an optional charset specification at the beginning:</span>
<a name="l00037"></a>00037 <span class="comment"></span>
<a name="l00038"></a>00038 <span class="comment"> [charset=["]Ascii|Jis|Unicode|Undefined["] ]comment</span>
<a name="l00039"></a>00039 <span class="comment"></span>
<a name="l00040"></a>00040 <span class="comment"> Undefined is used as a default if the comment doesn't start with a charset</span>
<a name="l00041"></a>00041 <span class="comment"> definition.</span>
<a name="l00042"></a>00042 <span class="comment"></span>
<a name="l00043"></a>00043 <span class="comment"> Following are a few examples of valid comments. The last one is written to</span>
<a name="l00044"></a>00044 <span class="comment"> the file.</span>
<a name="l00045"></a>00045 <span class="comment"> */</span>
<a name="l00046"></a>00046 exifData[<span class="stringliteral">"Exif.Photo.UserComment"</span>]
<a name="l00047"></a>00047 = <span class="stringliteral">"charset=\"Unicode\" An Unicode Exif comment added with Exiv2"</span>;
<a name="l00048"></a>00048 exifData[<span class="stringliteral">"Exif.Photo.UserComment"</span>]
<a name="l00049"></a>00049 = <span class="stringliteral">"charset=\"Undefined\" An undefined Exif comment added with Exiv2"</span>;
<a name="l00050"></a>00050 exifData[<span class="stringliteral">"Exif.Photo.UserComment"</span>]
<a name="l00051"></a>00051 = <span class="stringliteral">"Another undefined Exif comment added with Exiv2"</span>;
<a name="l00052"></a>00052 exifData[<span class="stringliteral">"Exif.Photo.UserComment"</span>]
<a name="l00053"></a>00053 = <span class="stringliteral">"charset=Ascii An ASCII Exif comment added with Exiv2"</span>;
<a name="l00054"></a>00054
<a name="l00055"></a>00055 std::cout << <span class="stringliteral">"Writing user comment '"</span>
<a name="l00056"></a>00056 << exifData[<span class="stringliteral">"Exif.Photo.UserComment"</span>]
<a name="l00057"></a>00057 << <span class="stringliteral">"' back to the image\n"</span>;
<a name="l00058"></a>00058
<a name="l00059"></a>00059 image->writeMetadata();
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="keywordflow">return</span> 0;
<a name="l00062"></a>00062 }
<a name="l00063"></a>00063 <span class="keywordflow">catch</span> (<a name="_a20"></a><a class="code" href="classExiv2_1_1AnyError.html">Exiv2::AnyError</a>& e) {
<a name="l00064"></a>00064 std::cout << <span class="stringliteral">"Caught Exiv2 exception '"</span> << e << <span class="stringliteral">"'\n"</span>;
<a name="l00065"></a>00065 <span class="keywordflow">return</span> -1;
<a name="l00066"></a>00066 }
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