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102 lines
4.0 KiB
C++
102 lines
4.0 KiB
C++
// ***************************************************************** -*- C++ -*-
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/*
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Abstract: Sample program showing how to add, modify and delete Exif metadata.
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File: addmoddel.cpp
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Version: $Name: $ $Revision: 1.5 $
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Author(s): Andreas Huggel (ahu) <ahuggel@gmx.net>
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History: 26-Jan-04, ahu: created
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*/
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// *****************************************************************************
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// included header files
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#include "exif.hpp"
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#include <iostream>
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#include <iomanip>
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// *****************************************************************************
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// Main
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int main()
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try {
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// Container for all metadata
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Exiv2::ExifData exifData;
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// *************************************************************************
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// Add to the Exif data
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// Create a ASCII string value (note the use of create)
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Exiv2::Value::AutoPtr v = Exiv2::Value::create(Exiv2::asciiString);
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// Set the value to a string
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v->read("1999:12:31 23:59:59");
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// Add the value together with its key to the Exif data container
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Exiv2::ExifKey key("Exif.Photo.DateTimeOriginal");
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exifData.add(key, v.get());
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std::cout << "Added key \"" << key << "\", value \"" << *v << "\"\n";
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// Now create a more interesting value (without using the create method)
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Exiv2::URationalValue::AutoPtr rv(new Exiv2::URationalValue);
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// Set two rational components from a string
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rv->read("1/2 1/3");
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// Add more elements through the extended interface of rational value
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rv->value_.push_back(std::make_pair(2,3));
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rv->value_.push_back(std::make_pair(3,4));
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// Add the key and value pair to the Exif data
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key = Exiv2::ExifKey("Exif.Image.PrimaryChromaticities");
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exifData.add(key, rv.get());
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std::cout << "Added key \"" << key << "\", value \"" << *rv << "\"\n";
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// *************************************************************************
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// Modify Exif data
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// Find the timestamp metadatum by its key
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key = Exiv2::ExifKey("Exif.Photo.DateTimeOriginal");
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Exiv2::ExifData::iterator pos = exifData.findKey(key);
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if (pos == exifData.end()) throw Exiv2::Error("Key not found");
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// Modify the value
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std::string date = pos->toString();
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date.replace(0, 4, "2000");
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pos->setValue(date);
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std::cout << "Modified key \"" << key
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<< "\", new value \"" << pos->value() << "\"\n";
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// Find the other key
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key = Exiv2::ExifKey("Exif.Image.PrimaryChromaticities");
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pos = exifData.findKey(key);
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if (pos == exifData.end()) throw Exiv2::Error("Key not found");
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// Get a pointer to a copy of the value
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v = pos->getValue();
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// Downcast the Value pointer to its actual type
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Exiv2::URationalValue* prv = dynamic_cast<Exiv2::URationalValue*>(v.release());
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if (prv == 0) throw Exiv2::Error("Downcast failed");
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rv = Exiv2::URationalValue::AutoPtr(prv);
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// Modify the value directly through the interface of URationalValue
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rv->value_[2] = std::make_pair(88,77);
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// Copy the modified value back to the metadatum
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pos->setValue(rv.get());
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std::cout << "Modified key \"" << key
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<< "\", new value \"" << pos->value() << "\"\n";
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// *************************************************************************
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// Delete metadata from the Exif data container
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// Delete the metadatum at iterator position pos
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key = Exiv2::ExifKey("Exif.Image.PrimaryChromaticities");
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pos = exifData.findKey(key);
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if (pos == exifData.end()) throw Exiv2::Error("Key not found");
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exifData.erase(pos);
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std::cout << "Deleted key \"" << key << "\"\n";
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// *************************************************************************
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// Finally, write the remaining Exif data to an image file
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int rc = exifData.write("img_2158.jpg");
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if (rc) {
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std::string error = Exiv2::ExifData::strError(rc, "img_2158.jpg");
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throw Exiv2::Error(error);
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}
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return 0;
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}
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catch (Exiv2::Error& e) {
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std::cout << "Caught Exiv2 exception '" << e << "'\n";
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return -1;
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}
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