exifcomment.cpp

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

// ***************************************************************** -*- 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.
*/
/*
Abstract : Sample program showing how to set the Exif comment of an image,
Exif.Photo.UserComment
*/
#include <exiv2/exiv2.hpp>
#include <iostream>
#include <cassert>
// *****************************************************************************
// Main
int main(int argc, char* const argv[])
try {
Exiv2::XmpParser::initialize();
::atexit(Exiv2::XmpParser::terminate);
#ifdef EXV_ENABLE_BMFF
Exiv2::enableBMFF();
#endif
if (argc != 2) {
std::cout << "Usage: " << argv[0] << " file\n";
return 1;
}
Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(argv[1]);
assert (image.get() != 0);
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 0;
}
catch (Exiv2::AnyError& e) {
std::cout << "Caught Exiv2 exception '" << e << "'\n";
return -1;
}
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::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:922
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