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<div class="title">addmoddel.cpp</div> </div>
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<div class="contents">
<p>Sample usage of high-level metadata operations.</p>
<div class="fragment"><div class="line"><span class="comment">// ***************************************************************** -*- C++ -*-</span></div>
<div class="line"><span class="comment">// addmoddel.cpp, $Rev: 3090 $</span></div>
<div class="line"><span class="comment">// Sample program showing how to add, modify and delete Exif metadata.</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include <exiv2/exiv2.hpp></span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include <iostream></span></div>
<div class="line"><span class="preprocessor">#include <iomanip></span></div>
<div class="line"><span class="preprocessor">#include <cassert></span></div>
<div class="line"></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"> <span class="keywordflow">if</span> (argc != 2) {</div>
<div class="line"> std::cout << <span class="stringliteral">"Usage: "</span> << argv[0] << <span class="stringliteral">" file\n"</span>;</div>
<div class="line"> <span class="keywordflow">return</span> 1;</div>
<div class="line"> }</div>
<div class="line"> <a name="a0"></a><a class="code" href="namespaceExiv2.html#a5153319711f35fe81cbc13f4b852450ca2d79fb07c9ec891f281968dad43c1e25">std::string</a> file(argv[1]);</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Container for exif metadata. This is an example of creating</span></div>
<div class="line"> <span class="comment">// exif metadata from scratch. If you want to add, modify, delete</span></div>
<div class="line"> <span class="comment">// metadata that exists in an image, start with ImageFactory::open</span></div>
<div class="line"> <a name="_a1"></a><a class="code" href="classExiv2_1_1ExifData.html">Exiv2::ExifData</a> exifData;</div>
<div class="line"></div>
<div class="line"> <span class="comment">// *************************************************************************</span></div>
<div class="line"> <span class="comment">// Add to the Exif data</span></div>
<div class="line"></div>
<div class="line"> <span class="comment">// This is the quickest way to add (simple) Exif data. If a metadatum for</span></div>
<div class="line"> <span class="comment">// a given key already exists, its value is overwritten. Otherwise a new</span></div>
<div class="line"> <span class="comment">// tag is added.</span></div>
<div class="line"> exifData[<span class="stringliteral">"Exif.Image.Model"</span>] = <span class="stringliteral">"Test 1"</span>; <span class="comment">// AsciiValue</span></div>
<div class="line"> exifData[<span class="stringliteral">"Exif.Image.SamplesPerPixel"</span>] = uint16_t(162); <span class="comment">// UShortValue</span></div>
<div class="line"> exifData[<span class="stringliteral">"Exif.Image.XResolution"</span>] = int32_t(-2); <span class="comment">// LongValue</span></div>
<div class="line"> exifData[<span class="stringliteral">"Exif.Image.YResolution"</span>] = <a name="a2"></a><a class="code" href="namespaceExiv2.html#a95756f3f7fa19103f83addf5fa088a30">Exiv2::Rational</a>(-2, 3); <span class="comment">// RationalValue</span></div>
<div class="line"> std::cout << <span class="stringliteral">"Added a few tags the quick way.\n"</span>;</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Create a ASCII string value (note the use of create)</span></div>
<div class="line"> <a class="code" href="classExiv2_1_1Value.html#a0f62e585b82c97738858b743e60dff21">Exiv2::Value::AutoPtr</a> v = <a name="a3"></a><a class="code" href="classExiv2_1_1Value.html#a7a6c027316e3dec0f7e79430f104c137">Exiv2::Value::create</a>(<a name="a4"></a><a class="code" href="namespaceExiv2.html#a5153319711f35fe81cbc13f4b852450ca773cf6dde5caaabb3dcf9fb161fa7dfd">Exiv2::asciiString</a>);</div>
<div class="line"> <span class="comment">// Set the value to a string</span></div>
<div class="line"> v->read(<span class="stringliteral">"1999:12:31 23:59:59"</span>);</div>
<div class="line"> <span class="comment">// Add the value together with its key to the Exif data container</span></div>
<div class="line"> <a name="_a5"></a><a class="code" href="classExiv2_1_1ExifKey.html">Exiv2::ExifKey</a> key(<span class="stringliteral">"Exif.Photo.DateTimeOriginal"</span>);</div>
<div class="line"> exifData.<a name="a6"></a><a class="code" href="classExiv2_1_1ExifData.html#a91d231cd1b9fefc311c5166e30ab66eb">add</a>(key, v.get());</div>
<div class="line"> std::cout << <span class="stringliteral">"Added key \""</span> << key << <span class="stringliteral">"\", value \""</span> << *v << <span class="stringliteral">"\"\n"</span>;</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Now create a more interesting value (without using the create method)</span></div>
<div class="line"> <a class="code" href="classExiv2_1_1ValueType.html#a0c76c512468a47f6eac463f4af278a14">Exiv2::URationalValue::AutoPtr</a> rv(<span class="keyword">new</span> <a name="_a7"></a><a class="code" href="classExiv2_1_1ValueType.html">Exiv2::URationalValue</a>);</div>
<div class="line"> <span class="comment">// Set two rational components from a string</span></div>
<div class="line"> rv->read(<span class="stringliteral">"1/2 1/3"</span>);</div>
<div class="line"> <span class="comment">// Add more elements through the extended interface of rational value</span></div>
<div class="line"> rv->value_.push_back(std::make_pair(2,3));</div>
<div class="line"> rv->value_.push_back(std::make_pair(3,4));</div>
<div class="line"> <span class="comment">// Add the key and value pair to the Exif data</span></div>
<div class="line"> key = <a class="code" href="classExiv2_1_1ExifKey.html">Exiv2::ExifKey</a>(<span class="stringliteral">"Exif.Image.PrimaryChromaticities"</span>);</div>
<div class="line"> exifData.<a class="code" href="classExiv2_1_1ExifData.html#a91d231cd1b9fefc311c5166e30ab66eb">add</a>(key, rv.get());</div>
<div class="line"> std::cout << <span class="stringliteral">"Added key \""</span> << key << <span class="stringliteral">"\", value \""</span> << *rv << <span class="stringliteral">"\"\n"</span>;</div>
<div class="line"></div>
<div class="line"> <span class="comment">// *************************************************************************</span></div>
<div class="line"> <span class="comment">// Modify Exif data</span></div>
<div class="line"></div>
<div class="line"> <span class="comment">// Since we know that the metadatum exists (or we don't mind creating a new</span></div>
<div class="line"> <span class="comment">// tag if it doesn't), we can simply do this:</span></div>
<div class="line"> <a name="_a8"></a><a class="code" href="classExiv2_1_1Exifdatum.html">Exiv2::Exifdatum</a>& tag = exifData[<span class="stringliteral">"Exif.Photo.DateTimeOriginal"</span>];</div>
<div class="line"> <a class="code" href="namespaceExiv2.html#a5153319711f35fe81cbc13f4b852450ca2d79fb07c9ec891f281968dad43c1e25">std::string</a> <a name="a9"></a><a class="code" href="namespaceExiv2.html#a5153319711f35fe81cbc13f4b852450ca0c347d8ddbbad9440f9bb6db8a06fa45">date</a> = tag.<a name="a10"></a><a class="code" href="classExiv2_1_1Exifdatum.html#a73d1e5346411c2adf520fec405f2e536">toString</a>();</div>
<div class="line"> date.replace(0, 4, <span class="stringliteral">"2000"</span>);</div>
<div class="line"> tag.<a name="a11"></a><a class="code" href="classExiv2_1_1Exifdatum.html#a8e1c4b0d24e694e91ebc3f8517365bcd">setValue</a>(date);</div>
<div class="line"> std::cout << <span class="stringliteral">"Modified key \""</span> << key</div>
<div class="line"> << <span class="stringliteral">"\", new value \""</span> << tag.<a name="a12"></a><a class="code" href="classExiv2_1_1Exifdatum.html#a44d8261179011b2f68075d805e565866">value</a>() << <span class="stringliteral">"\"\n"</span>;</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Alternatively, we can use findKey()</span></div>
<div class="line"> key = <a class="code" href="classExiv2_1_1ExifKey.html">Exiv2::ExifKey</a>(<span class="stringliteral">"Exif.Image.PrimaryChromaticities"</span>);</div>
<div class="line"> <a class="code" href="classExiv2_1_1ExifData.html#a02e2a2acb4cfeb0f7755c1a45f94106f">Exiv2::ExifData::iterator</a> pos = exifData.<a name="a13"></a><a class="code" href="classExiv2_1_1ExifData.html#a9700e579aef8fd1845dd5da59b608773">findKey</a>(key);</div>
<div class="line"> <span class="keywordflow">if</span> (pos == exifData.<a name="a14"></a><a class="code" href="classExiv2_1_1ExifData.html#a9c15177b03489e3d4bb81e9acc1165fe">end</a>()) <span class="keywordflow">throw</span> <a name="_a15"></a><a class="code" href="classExiv2_1_1BasicError.html">Exiv2::Error</a>(1, <span class="stringliteral">"Key not found"</span>);</div>
<div class="line"> <span class="comment">// Get a pointer to a copy of the value</span></div>
<div class="line"> v = pos->getValue();</div>
<div class="line"> <span class="comment">// Downcast the Value pointer to its actual type</span></div>
<div class="line"> <a class="code" href="classExiv2_1_1ValueType.html">Exiv2::URationalValue</a>* prv = <span class="keyword">dynamic_cast<</span><a class="code" href="classExiv2_1_1ValueType.html">Exiv2::URationalValue</a>*<span class="keyword">></span>(v.release());</div>
<div class="line"> <span class="keywordflow">if</span> (prv == 0) <span class="keywordflow">throw</span> <a name="a16"></a><a class="code" href="namespaceExiv2.html#accd3e49cafe9db52c1e0e6f648753cae">Exiv2::Error</a>(1, <span class="stringliteral">"Downcast failed"</span>);</div>
<div class="line"> rv = <a name="a17"></a><a class="code" href="classExiv2_1_1ValueType.html#a0c76c512468a47f6eac463f4af278a14">Exiv2::URationalValue::AutoPtr</a>(prv);</div>
<div class="line"> <span class="comment">// Modify the value directly through the interface of URationalValue</span></div>
<div class="line"> rv->value_[2] = std::make_pair(88,77);</div>
<div class="line"> <span class="comment">// Copy the modified value back to the metadatum</span></div>
<div class="line"> pos->setValue(rv.get());</div>
<div class="line"> std::cout << <span class="stringliteral">"Modified key \""</span> << key</div>
<div class="line"> << <span class="stringliteral">"\", new value \""</span> << pos->value() << <span class="stringliteral">"\"\n"</span>;</div>
<div class="line"></div>
<div class="line"> <span class="comment">// *************************************************************************</span></div>
<div class="line"> <span class="comment">// Delete metadata from the Exif data container</span></div>
<div class="line"></div>
<div class="line"> <span class="comment">// Delete the metadatum at iterator position pos</span></div>
<div class="line"> key = <a class="code" href="classExiv2_1_1ExifKey.html">Exiv2::ExifKey</a>(<span class="stringliteral">"Exif.Image.PrimaryChromaticities"</span>);</div>
<div class="line"> pos = exifData.<a class="code" href="classExiv2_1_1ExifData.html#a9700e579aef8fd1845dd5da59b608773">findKey</a>(key);</div>
<div class="line"> <span class="keywordflow">if</span> (pos == exifData.<a class="code" href="classExiv2_1_1ExifData.html#a9c15177b03489e3d4bb81e9acc1165fe">end</a>()) <span class="keywordflow">throw</span> <a class="code" href="classExiv2_1_1BasicError.html">Exiv2::Error</a>(1, <span class="stringliteral">"Key not found"</span>);</div>
<div class="line"> exifData.<a name="a18"></a><a class="code" href="classExiv2_1_1ExifData.html#a13b24f0ee2a3f585cf714b9418b75edd">erase</a>(pos);</div>
<div class="line"> std::cout << <span class="stringliteral">"Deleted key \""</span> << key << <span class="stringliteral">"\"\n"</span>;</div>
<div class="line"></div>
<div class="line"> <span class="comment">// *************************************************************************</span></div>
<div class="line"> <span class="comment">// Finally, write the remaining Exif data to the image file</span></div>
<div class="line"> <a class="code" href="classExiv2_1_1Image.html#a89ad3ffe7a4e8a943d267d77843415fb">Exiv2::Image::AutoPtr</a> image = <a name="a19"></a><a class="code" href="classExiv2_1_1ImageFactory.html#a981013bdf0d31ec7f64f0f6339fe323e">Exiv2::ImageFactory::open</a>(file);</div>
<div class="line"> assert(image.get() != 0);</div>
<div class="line"></div>
<div class="line"> image->setExifData(exifData);</div>
<div class="line"> image->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="_a20"></a><a class="code" href="classExiv2_1_1AnyError.html">Exiv2::AnyError</a>& e) {</div>
<div class="line"> std::cout << <span class="stringliteral">"Caught Exiv2 exception '"</span> << e << <span class="stringliteral">"'\n"</span>;</div>
<div class="line"> <span class="keywordflow">return</span> -1;</div>
<div class="line">}</div>
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