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 {
#ifdef EXV_ENABLE_BMFF
Exiv2::enableBMFF();
#endif
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;
}
}
Simple error class used for exceptions. An output operator is provided to print errors to a stream.
Definition: error.hpp:235
A container for Exif data. This is a top-level class of the Exiv2 library. The container holds Exifda...
Definition: exif.hpp:373
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...
static void terminate()
Terminate the XMP Toolkit and unregister custom namespaces.
static bool initialize(XmpParser::XmpLockFct xmpLockFct=nullptr, void *pLockData=nullptr)
Initialize the XMP Toolkit.