136 lines
4.8 KiB
C++
136 lines
4.8 KiB
C++
// ***************************************************************** -*- C++ -*-
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/*
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Abstract: Example showing how to add, modify and delete Exif metadata
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File: example1.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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// local declarations
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// Simple Exif data print function
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void exifPrint(const Exif::ExifData& exifData);
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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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Exif::ExifData exifData;
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// *************************************************************************
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// Add to the Exif data
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// Create a value of the required type
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Exif::Value* v = Exif::Value::create(Exif::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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std::string key = "Image.DateTime.DateTimeOriginal";
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exifData.add(key, v);
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std::cout << "Added key \"" << key << "\", value \"" << *v << "\"\n";
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// Delete the memory allocated by Value::create
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delete v;
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// Now create a more interesting value
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Exif::URationalValue* rv = new Exif::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 = "Image.ImageCharacteristics.PrimaryChromaticities";
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exifData.add(key, rv);
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std::cout << "Added key \"" << key << "\", value \"" << *rv << "\"\n";
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// Delete memory allocated on the heap
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delete rv;
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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 = "Image.DateTime.DateTimeOriginal";
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Exif::ExifData::iterator pos = exifData.findKey(key);
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if (pos == exifData.end()) throw Exif::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 = "Image.ImageCharacteristics.PrimaryChromaticities";
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pos = exifData.findKey(key);
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if (pos == exifData.end()) throw Exif::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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rv = dynamic_cast<Exif::URationalValue*>(v);
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if (rv == 0) throw Exif::Error("Downcast failed");
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// Modify elements through the extended interface of the actual type
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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);
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// Delete the memory allocated by getValue
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delete v;
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std::cout << "Modified key \"" << key
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<< "\", new value \"" << pos->value() << "\"\n";
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std::cout << "---\n";
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exifPrint(exifData);
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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 = "Image.ImageCharacteristics.PrimaryChromaticities";
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pos = exifData.findKey(key);
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if (pos == exifData.end()) throw Exif::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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std::cout << "---\n";
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exifPrint(exifData);
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return 0;
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}
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catch (Exif::Error& e) {
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std::cout << "Caught Exif exception '" << e << "'\n";
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return 1;
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}
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// *****************************************************************************
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// local definitions
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void exifPrint(const Exif::ExifData& exifData)
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{
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Exif::ExifData::const_iterator beg = exifData.begin();
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Exif::ExifData::const_iterator end = exifData.end();
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Exif::ExifData::const_iterator i = beg;
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for (; i != end; ++i) {
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std::cout << "0x"
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<< std::hex << std::setw(4) << std::setfill('0') << std::right
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<< i->tag() << " "
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<< std::setw(27) << std::setfill(' ') << std::left
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<< i->tagName() << " "
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<< std::setw(17) << std::setfill(' ') << std::left
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<< i->typeName() << " "
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<< std::dec << std::setw(3)
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<< std::setfill(' ') << std::right
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<< i->count() << " "
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<< std::dec << i->value() << "\n";
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}
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}
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