55aebc0686
Image::read/writeMetadata and ImageFactory::open now throw Error in case of failure. Applications therefore now need an exception handler for the error handling of such function calls. This should result in shorter and simpler application code.
69 lines
2.2 KiB
C++
69 lines
2.2 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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#include <cassert>
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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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assert (image.get() != 0);
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image->readMetadata();
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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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image->writeMetadata();
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return 0;
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}
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catch (Exiv2::AnyError& 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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