exifcomment.cpp

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

// ***************************************************************** -*- C++ -*-
/*
Abstract : Sample program showing how to set the Exif comment of an image,
Exif.Photo.UserComment
File: exifcomment.cpp
Version : $Rev: 2286 $
Author(s): Andreas Huggel (ahu) <ahuggel@gmx.net>
History : 10-May-04, ahu: created
16-Jan-05, ahu: updated using CommentValue and operator trickery
*/
// *****************************************************************************
// included header files
#include <exiv2/exiv2.hpp>
#include <iostream>
#include <cassert>
// *****************************************************************************
// Main
int main(int argc, char* const argv[])
try {
if (argc != 2) {
std::cout << "Usage: " << argv[0] << " file\n";
return 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\" An 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;
}