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exifvalue.cpp

Prints the value of a single Exif tag in a file

// SPDX-License-Identifier: GPL-2.0-or-later
// Sample program to print value of an exif key in an image
#include <exiv2/exiv2.hpp>
#include <iostream>
int main(int argc, char* const argv[]) {
Exiv2::XmpParser::initialize();
::atexit(Exiv2::XmpParser::terminate);
if (argc != 3) {
std::cerr << "Usage: " << argv[0] << " file key\n";
return EXIT_FAILURE;
}
const char* file = argv[1];
const char* key = argv[2];
auto image = Exiv2::ImageFactory::open(file);
image->readMetadata();
Exiv2::ExifData& exifData = image->exifData();
if (exifData.empty()) {
std::cerr << "no metadata found in file " << file << std::endl;
return EXIT_FAILURE;
}
try {
std::cout << exifData[key] << std::endl;
} catch (Exiv2::Error& e) {
std::cerr << "Caught Exiv2 exception '" << e << "'" << std::endl;
return EXIT_FAILURE;
} catch (...) {
std::cerr << "Caught a cold!" << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
Exiv2::Error
Simple error class used for exceptions. An output operator is provided to print errors to a stream.
Definition error.hpp:236
Exiv2::ExifData
A container for Exif data. This is a top-level class of the Exiv2 library. The container holds Exifda...
Definition exif.hpp:379
Exiv2::ExifData::empty
bool empty() const
Return true if there is no Exif metadata.
Definition exif.hpp:465
Exiv2::ImageFactory::open
static Image::UniquePtr 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:820
Exiv2::XmpParser::initialize
static bool initialize(XmpParser::XmpLockFct xmpLockFct=nullptr, void *pLockData=nullptr)
Initialize the XMP Toolkit.
Definition xmp.cpp:568
Exiv2::XmpParser::terminate
static void terminate()
Terminate the XMP Toolkit and unregister custom namespaces.
Definition xmp.cpp:623