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exifcomment.cpp

Sample program showing how to set the Exif comment of an image.

// SPDX-License-Identifier: GPL-2.0-or-later
// Abstract : Sample program showing how to set the Exif comment of an image, Exif.Photo.UserComment
#include <exiv2/exiv2.hpp>
#include <iostream>
// *****************************************************************************
// Main
int main(int argc, char* const argv[]) {
try {
Exiv2::XmpParser::initialize();
::atexit(Exiv2::XmpParser::terminate);
if (argc != 2) {
std::cout << "Usage: " << argv[0] << " file\n";
return EXIT_FAILURE;
}
auto image = Exiv2::ImageFactory::open(argv[1]);
image->readMetadata();
Exiv2::ExifData& exifData = image->exifData();
/*
Exiv2 uses a CommentValue for Exif user comments. The format of the
comment string includes an optional charset specification at the beginning:
[charset=[Ascii|Jis|Unicode|Undefined]] comment
Undefined is used as a default if the comment doesn't start with a charset
definition.
Following are a few examples of valid comments. The last one is written to
the file.
*/
exifData["Exif.Photo.UserComment"] = "charset=Unicode A Unicode Exif comment added with Exiv2";
exifData["Exif.Photo.UserComment"] = "charset=Undefined An undefined Exif comment added with Exiv2";
exifData["Exif.Photo.UserComment"] = "Another undefined Exif comment added with Exiv2";
exifData["Exif.Photo.UserComment"] = "charset=Ascii An ASCII Exif comment added with Exiv2";
std::cout << "Writing user comment '" << exifData["Exif.Photo.UserComment"] << "' back to the image\n";
image->writeMetadata();
return EXIT_SUCCESS;
} catch (Exiv2::Error& e) {
std::cout << "Caught Exiv2 exception '" << e << "'\n";
return EXIT_FAILURE;
}
}
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::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