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exifvalue.cpp

Prints the value of a single Exif tag in a file

// ***************************************************************** -*- C++ -*-
/*
* Copyright (C) 2004-2021 Exiv2 authors
* This program is part of the Exiv2 distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
*/
// exifvalue.cpp
// Sample program to print value of an exif key in an image
#include <exiv2/exiv2.hpp>
#include <iostream>
#include <iomanip>
#include <cassert>
#include <string>
int main(int argc, char* const argv[])
{
Exiv2::XmpParser::initialize();
::atexit(Exiv2::XmpParser::terminate);
#ifdef EXV_ENABLE_BMFF
Exiv2::enableBMFF();
#endif
if (argc != 3) {
std::cerr << "Usage: " << argv[0] << " file key\n";
return 1;
}
const char* file = argv[1];
const char* key = argv[2];
Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(file);
assert(image.get() != 0);
image->readMetadata();
Exiv2::ExifData &exifData = image->exifData();
if ( exifData.empty()) {
std::cerr << "no metadata found in file " << file << std::endl;
exit(2);
}
try {
std::cout << exifData[key] << std::endl;
} catch (Exiv2::AnyError& e) {
std::cerr << "Caught Exiv2 exception '" << e << "'" << std::endl;
exit(3);
} catch ( ... ) {
std::cerr << "Caught a cold!" << std::endl;
exit(4);
}
return 0;
}
Exiv2::AnyError
Error class interface. Allows the definition and use of a hierarchy of error classes which can all be...
Definition error.hpp:174
Exiv2::ExifData
A container for Exif data. This is a top-level class of the Exiv2 library. The container holds Exifda...
Definition exif.hpp:434
Exiv2::ExifData::empty
bool empty() const
Return true if there is no Exif metadata.
Definition exif.hpp:512
Exiv2::ImageFactory::open
static Image::AutoPtr open(const std::string &path, bool useCurl=true)
Create an Image subclass of the appropriate type by reading the specified file. Image type is derived...
Definition image.cpp:924
Exiv2::Image::AutoPtr
std::auto_ptr< Image > AutoPtr
Image auto_ptr type.
Definition image.hpp:81
Exiv2::XmpParser::initialize
static bool initialize(XmpParser::XmpLockFct xmpLockFct=0, void *pLockData=0)
Initialize the XMP Toolkit.
Definition xmp.cpp:641
Exiv2::XmpParser::terminate
static void terminate()
Terminate the XMP Toolkit and unregister custom namespaces.
Definition xmp.cpp:703