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<h1>addmoddel.cpp</h1>Sample usage of high-level metadata operations.<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">// addmoddel.cpp, $Rev: 631 $</span>
<a name="l00003"></a>00003 <span class="comment">// Sample program showing how to add, modify and delete Exif metadata.</span>
<a name="l00004"></a>00004
<a name="l00005"></a>00005 <span class="preprocessor">#include "<a class="code" href="image_8hpp.html">image.hpp</a>"</span>
<a name="l00006"></a>00006 <span class="preprocessor">#include "<a class="code" href="exif_8hpp.html">exif.hpp</a>"</span>
<a name="l00007"></a>00007 <span class="preprocessor">#include <iostream></span>
<a name="l00008"></a>00008 <span class="preprocessor">#include <iomanip></span>
<a name="l00009"></a>00009 <span class="preprocessor">#include <cassert></span>
<a name="l00010"></a>00010
<a name="l00011"></a>00011 <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="l00012"></a>00012 <span class="keyword">try</span> {
<a name="l00013"></a>00013 <span class="keywordflow">if</span> (argc != 2) {
<a name="l00014"></a>00014 std::cout << <span class="stringliteral">"Usage: "</span> << argv[0] << <span class="stringliteral">" file\n"</span>;
<a name="l00015"></a>00015 <span class="keywordflow">return</span> 1;
<a name="l00016"></a>00016 }
<a name="l00017"></a>00017 std::string file(argv[1]);
<a name="l00018"></a>00018
<a name="l00019"></a>00019 <span class="comment">// Container for exif metadata. This is an example of creating</span>
<a name="l00020"></a>00020 <span class="comment">// exif metadata from scratch. If you want to add, modify, delete</span>
<a name="l00021"></a>00021 <span class="comment">// metadata that exists in an image, start with ImageFactory::open</span>
<a name="l00022"></a>00022 <a name="_a0"></a><a class="code" href="classExiv2_1_1ExifData.html">Exiv2::ExifData</a> exifData;
<a name="l00023"></a>00023
<a name="l00024"></a>00024 <span class="comment">// *************************************************************************</span>
<a name="l00025"></a>00025 <span class="comment">// Add to the Exif data</span>
<a name="l00026"></a>00026
<a name="l00027"></a>00027 <span class="comment">// This is the quickest way to add (simple) Exif data. If a metadatum for</span>
<a name="l00028"></a>00028 <span class="comment">// a given key already exists, its value is overwritten. Otherwise a new</span>
<a name="l00029"></a>00029 <span class="comment">// tag is added.</span>
<a name="l00030"></a>00030 exifData[<span class="stringliteral">"Exif.Image.Model"</span>] = <span class="stringliteral">"Test 1"</span>; <span class="comment">// AsciiValue</span>
<a name="l00031"></a>00031 exifData[<span class="stringliteral">"Exif.Image.SamplesPerPixel"</span>] = uint16_t(162); <span class="comment">// UShortValue</span>
<a name="l00032"></a>00032 exifData[<span class="stringliteral">"Exif.Image.XResolution"</span>] = int32_t(-2); <span class="comment">// LongValue</span>
<a name="l00033"></a>00033 exifData[<span class="stringliteral">"Exif.Image.YResolution"</span>] = <a name="a1"></a><a class="code" href="namespaceExiv2.html#95756f3f7fa19103f83addf5fa088a30">Exiv2::Rational</a>(-2, 3); <span class="comment">// RationalValue</span>
<a name="l00034"></a>00034 std::cout << <span class="stringliteral">"Added a few tags the quick way.\n"</span>;
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <span class="comment">// Create a ASCII string value (note the use of create)</span>
<a name="l00037"></a>00037 <a class="code" href="classExiv2_1_1Value.html#0f62e585b82c97738858b743e60dff21">Exiv2::Value::AutoPtr</a> v = <a name="a2"></a><a class="code" href="classExiv2_1_1Value.html#7a6c027316e3dec0f7e79430f104c137">Exiv2::Value::create</a>(Exiv2::asciiString);
<a name="l00038"></a>00038 <span class="comment">// Set the value to a string</span>
<a name="l00039"></a>00039 v->read(<span class="stringliteral">"1999:12:31 23:59:59"</span>);
<a name="l00040"></a>00040 <span class="comment">// Add the value together with its key to the Exif data container</span>
<a name="l00041"></a>00041 <a name="_a3"></a><a class="code" href="classExiv2_1_1ExifKey.html">Exiv2::ExifKey</a> key(<span class="stringliteral">"Exif.Photo.DateTimeOriginal"</span>);
<a name="l00042"></a>00042 exifData.<a name="a4"></a><a class="code" href="classExiv2_1_1ExifData.html#841b205ae0af419c2639f86d9bf03267">add</a>(key, v.get());
<a name="l00043"></a>00043 std::cout << <span class="stringliteral">"Added key \""</span> << key << <span class="stringliteral">"\", value \""</span> << *v << <span class="stringliteral">"\"\n"</span>;
<a name="l00044"></a>00044
<a name="l00045"></a>00045 <span class="comment">// Now create a more interesting value (without using the create method)</span>
<a name="l00046"></a>00046 <a name="a5"></a><a class="code" href="classExiv2_1_1ValueType.html#0c76c512468a47f6eac463f4af278a14">Exiv2::URationalValue::AutoPtr</a> rv(<span class="keyword">new</span> <a name="_a6"></a><a class="code" href="classExiv2_1_1ValueType.html">Exiv2::URationalValue</a>);
<a name="l00047"></a>00047 <span class="comment">// Set two rational components from a string</span>
<a name="l00048"></a>00048 rv->read(<span class="stringliteral">"1/2 1/3"</span>);
<a name="l00049"></a>00049 <span class="comment">// Add more elements through the extended interface of rational value</span>
<a name="l00050"></a>00050 rv->value_.push_back(std::make_pair(2,3));
<a name="l00051"></a>00051 rv->value_.push_back(std::make_pair(3,4));
<a name="l00052"></a>00052 <span class="comment">// Add the key and value pair to the Exif data</span>
<a name="l00053"></a>00053 key = <a class="code" href="classExiv2_1_1ExifKey.html">Exiv2::ExifKey</a>(<span class="stringliteral">"Exif.Image.PrimaryChromaticities"</span>);
<a name="l00054"></a>00054 exifData.<a class="code" href="classExiv2_1_1ExifData.html#841b205ae0af419c2639f86d9bf03267">add</a>(key, rv.get());
<a name="l00055"></a>00055 std::cout << <span class="stringliteral">"Added key \""</span> << key << <span class="stringliteral">"\", value \""</span> << *rv << <span class="stringliteral">"\"\n"</span>;
<a name="l00056"></a>00056
<a name="l00057"></a>00057 <span class="comment">// *************************************************************************</span>
<a name="l00058"></a>00058 <span class="comment">// Modify Exif data</span>
<a name="l00059"></a>00059
<a name="l00060"></a>00060 <span class="comment">// Since we know that the metadatum exists (or we don't mind creating a new</span>
<a name="l00061"></a>00061 <span class="comment">// tag if it doesn't), we can simply do this:</span>
<a name="l00062"></a>00062 <a name="_a7"></a><a class="code" href="classExiv2_1_1Exifdatum.html">Exiv2::Exifdatum</a>& tag = exifData[<span class="stringliteral">"Exif.Photo.DateTimeOriginal"</span>];
<a name="l00063"></a>00063 std::string date = tag.<a name="a8"></a><a class="code" href="classExiv2_1_1Exifdatum.html#73d1e5346411c2adf520fec405f2e536">toString</a>();
<a name="l00064"></a>00064 date.replace(0, 4, <span class="stringliteral">"2000"</span>);
<a name="l00065"></a>00065 tag.<a name="a9"></a><a class="code" href="classExiv2_1_1Exifdatum.html#2d1b65a584da873113a49d9e88464bee">setValue</a>(date);
<a name="l00066"></a>00066 std::cout << <span class="stringliteral">"Modified key \""</span> << key
<a name="l00067"></a>00067 << <span class="stringliteral">"\", new value \""</span> << tag.<a name="a10"></a><a class="code" href="classExiv2_1_1Exifdatum.html#44d8261179011b2f68075d805e565866">value</a>() << <span class="stringliteral">"\"\n"</span>;
<a name="l00068"></a>00068
<a name="l00069"></a>00069 <span class="comment">// Alternatively, we can use findKey()</span>
<a name="l00070"></a>00070 key = <a class="code" href="classExiv2_1_1ExifKey.html">Exiv2::ExifKey</a>(<span class="stringliteral">"Exif.Image.PrimaryChromaticities"</span>);
<a name="l00071"></a>00071 <a name="a11"></a><a class="code" href="classExiv2_1_1ExifData.html#02e2a2acb4cfeb0f7755c1a45f94106f">Exiv2::ExifData::iterator</a> pos = exifData.<a name="a12"></a><a class="code" href="classExiv2_1_1ExifData.html#9700e579aef8fd1845dd5da59b608773">findKey</a>(key);
<a name="l00072"></a>00072 <span class="keywordflow">if</span> (pos == exifData.<a name="a13"></a><a class="code" href="classExiv2_1_1ExifData.html#9c15177b03489e3d4bb81e9acc1165fe">end</a>()) <span class="keywordflow">throw</span> <a name="_a14"></a><a class="code" href="classExiv2_1_1Error.html">Exiv2::Error</a>(1, <span class="stringliteral">"Key not found"</span>);
<a name="l00073"></a>00073 <span class="comment">// Get a pointer to a copy of the value</span>
<a name="l00074"></a>00074 v = pos->getValue();
<a name="l00075"></a>00075 <span class="comment">// Downcast the Value pointer to its actual type</span>
<a name="l00076"></a>00076 Exiv2::URationalValue* prv = dynamic_cast<Exiv2::URationalValue*>(v.release());
<a name="l00077"></a>00077 <span class="keywordflow">if</span> (prv == 0) <span class="keywordflow">throw</span> Exiv2::Error(1, <span class="stringliteral">"Downcast failed"</span>);
<a name="l00078"></a>00078 rv = <a class="code" href="classExiv2_1_1ValueType.html#0c76c512468a47f6eac463f4af278a14">Exiv2::URationalValue::AutoPtr</a>(prv);
<a name="l00079"></a>00079 <span class="comment">// Modify the value directly through the interface of URationalValue</span>
<a name="l00080"></a>00080 rv->value_[2] = std::make_pair(88,77);
<a name="l00081"></a>00081 <span class="comment">// Copy the modified value back to the metadatum</span>
<a name="l00082"></a>00082 pos->setValue(rv.get());
<a name="l00083"></a>00083 std::cout << <span class="stringliteral">"Modified key \""</span> << key
<a name="l00084"></a>00084 << <span class="stringliteral">"\", new value \""</span> << pos->value() << <span class="stringliteral">"\"\n"</span>;
<a name="l00085"></a>00085
<a name="l00086"></a>00086 <span class="comment">// *************************************************************************</span>
<a name="l00087"></a>00087 <span class="comment">// Delete metadata from the Exif data container</span>
<a name="l00088"></a>00088
<a name="l00089"></a>00089 <span class="comment">// Delete the metadatum at iterator position pos</span>
<a name="l00090"></a>00090 key = <a class="code" href="classExiv2_1_1ExifKey.html">Exiv2::ExifKey</a>(<span class="stringliteral">"Exif.Image.PrimaryChromaticities"</span>);
<a name="l00091"></a>00091 pos = exifData.<a class="code" href="classExiv2_1_1ExifData.html#9700e579aef8fd1845dd5da59b608773">findKey</a>(key);
<a name="l00092"></a>00092 <span class="keywordflow">if</span> (pos == exifData.<a class="code" href="classExiv2_1_1ExifData.html#9c15177b03489e3d4bb81e9acc1165fe">end</a>()) <span class="keywordflow">throw</span> Exiv2::Error(1, <span class="stringliteral">"Key not found"</span>);
<a name="l00093"></a>00093 exifData.<a name="a15"></a><a class="code" href="classExiv2_1_1ExifData.html#13b24f0ee2a3f585cf714b9418b75edd">erase</a>(pos);
<a name="l00094"></a>00094 std::cout << <span class="stringliteral">"Deleted key \""</span> << key << <span class="stringliteral">"\"\n"</span>;
<a name="l00095"></a>00095
<a name="l00096"></a>00096 <span class="comment">// *************************************************************************</span>
<a name="l00097"></a>00097 <span class="comment">// Finally, write the remaining Exif data to the image file</span>
<a name="l00098"></a>00098 <a class="code" href="classExiv2_1_1Image.html#89ad3ffe7a4e8a943d267d77843415fb">Exiv2::Image::AutoPtr</a> image = <a name="a16"></a><a class="code" href="classExiv2_1_1ImageFactory.html#981013bdf0d31ec7f64f0f6339fe323e">Exiv2::ImageFactory::open</a>(file);
<a name="l00099"></a>00099 assert(image.get() != 0);
<a name="l00100"></a>00100
<a name="l00101"></a>00101 image->setExifData(exifData);
<a name="l00102"></a>00102 image->writeMetadata();
<a name="l00103"></a>00103
<a name="l00104"></a>00104 <span class="keywordflow">return</span> 0;
<a name="l00105"></a>00105 }
<a name="l00106"></a>00106 <span class="keywordflow">catch</span> (<a name="_a17"></a><a class="code" href="classExiv2_1_1AnyError.html">Exiv2::AnyError</a>& e) {
<a name="l00107"></a>00107 std::cout << <span class="stringliteral">"Caught Exiv2 exception '"</span> << e << <span class="stringliteral">"'\n"</span>;
<a name="l00108"></a>00108 <span class="keywordflow">return</span> -1;
<a name="l00109"></a>00109 }
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