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83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
// ***************************************************************** -*- C++ -*-
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/*
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Abstract : Sample program showing how to set the Exif comment of an image,
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Exif.Photo.UserComment
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File: exifcomment.cpp
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Version : $Rev$
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Author(s): Andreas Huggel (ahu) <ahuggel@gmx.net>
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History : 10-May-04, ahu: created
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16-Jan-05, ahu: updated using CommentValue and operator trickery
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*/
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// *****************************************************************************
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// included header files
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#include "image.hpp"
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#include "exif.hpp"
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#include <iostream>
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#include <iomanip>
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#include <cstring>
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// *****************************************************************************
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// Main
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int main(int argc, char* const argv[])
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try {
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if (argc != 2) {
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std::cout << "Usage: " << argv[0] << " file\n";
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return 1;
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}
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Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(argv[1]);
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if (image.get() == 0) {
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std::string error(argv[1]);
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error += " : Could not read file or unknown image type";
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throw Exiv2::Error(error);
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}
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// Load existing metadata
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int rc = image->readMetadata();
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if (rc) {
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std::string error = Exiv2::Image::strError(rc, argv[1]);
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throw Exiv2::Error(error);
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}
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Exiv2::ExifData &exifData = image->exifData();
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/*
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Exiv2 uses a CommentValue for Exif user comments. The format of the
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comment string includes an optional charset specification at the beginning:
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[charset=["]Ascii|Jis|Unicode|Undefined["] ]comment
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Undefined is used as a default if the comment doesn't start with a charset
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definition.
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Following are a few examples of valid comments. The last one is written to
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the file.
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*/
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exifData["Exif.Photo.UserComment"]
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= "charset=\"Unicode\" An Unicode Exif comment added with Exiv2";
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exifData["Exif.Photo.UserComment"]
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= "charset=\"Undefined\" An undefined Exif comment added with Exiv2";
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exifData["Exif.Photo.UserComment"]
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= "Another undefined Exif comment added with Exiv2";
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exifData["Exif.Photo.UserComment"]
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= "charset=Ascii An ASCII Exif comment added with Exiv2";
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std::cout << "Writing user comment '"
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<< exifData["Exif.Photo.UserComment"]
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<< "' back to the image\n";
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rc = image->writeMetadata();
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if (rc) {
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std::string error = Exiv2::Image::strError(rc, argv[1]);
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throw Exiv2::Error(error);
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}
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return rc;
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}
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catch (Exiv2::Error& e) {
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std::cout << "Caught Exiv2 exception '" << e << "'\n";
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return -1;
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}
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