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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: 485 $
  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 "exif.hpp"
#include <iostream>
#include <iomanip>
#include <cstring>

// *****************************************************************************
// Main
int main(int argc, char* const argv[])
try {

    if (argc != 2) {
        std::cout << "Usage: " << argv[0] << " file\n";
        return 1;
    }

    Exiv2::ExifData exifData;
    int rc = exifData.read(argv[1]);
    if (rc) {
        std::string error = Exiv2::ExifData::strError(rc, argv[1]);
        throw Exiv2::Error(error);
    }

    /*
      Use Exiv2::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. Only the last one is 
      written to the file.
     */
    Exiv2::CommentValue value("charset=Ascii An ASCII Exif comment added with Exiv2");
    value.read("charset=\"Unicode\" An Unicode Exif comment added with Exiv2");
    value.read("charset=\"Undefined\" An undefined Exif comment added with Exiv2");
    value.read("Another undefined Exif comment added with Exiv2");

    exifData["Exif.Photo.UserComment"] = value;

    std::cout << "Writing user comment '"
              << exifData["Exif.Photo.UserComment"]
              << "' back to the image\n";

    rc = exifData.write(argv[1]);
    if (rc) {
        std::string error = Exiv2::ExifData::strError(rc, argv[1]);
        throw Exiv2::Error(error);
    }

   return rc;
}
catch (Exiv2::Error& e) {
    std::cout << "Caught Exiv2 exception '" << e << "'\n";
    return -1;
}

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