The Exiv2 library is made up of all +elements defined in the Exiv2 +namespace. The Action and Util namespaces are only used by the +Exiv2 command line utility. To learn about the library, concentrate on +the members of the Exiv2 namespace.
+ +Exiv2::ExifData is +the top-level class of the Exiv2 library. It has a container of Exif +metadata and defines related methods. The container holds +Exiv2::Metadatum +objects. Class Exiv2::Metadatum defines methods to access the +information of one Exif tag. It models the tag data as a key and value +pair. A key is just a well-formed string. The abstract base class +Exiv2::Value defines the +interface to access tag information, from which concrete values are +derived. The actual value used in a metadatum depends on the type of +the Exif tag. It is usually determined when the Exif metadata is read +from an image. It is also possible to manually create a Value and add +together with a key add it to an ExifData container.
+ +Two simple examples demonstrate the basic use of Exiv2 +functionality: Exifprint +shows how the Exif data of an image can be written to the screen. +Addmoddel shows how to +add, modify and delete Exif metadata. Have a look at the +implementation of the different actions of the Exiv2 utility +(actions.cpp) for more real-world code.
+ +Exif Makernote data can be accessed through ExifData in the same +way as the standard Exif tags. In other words, for each entry of a +known Makernote, there is a corresponding Metadatum in the ExifData +container. The abstract base class +Exiv2::MakerNote defines +the Makernote interface. Subclass +Exiv2::IfdMakerNote +models makernotes encoded in IFD format. +Implementing a new +IFD makernote is trivial. Implementing a new makernote that is not +encoded in IFD format however, is not. Please + contact me if you have such a +makernote specification and would like assistance adding it to Exiv2.
+ +Exiv2::Ifd is a generic +low-level class that models an image file directory as defined by TIFF +and used in the Exif standard. Exiv2::Ifd could be used to implement +read only as well as read/write access to Exif (or TIFF) data without +the overhead (and convenience) of Exiv2::ExifData.
+ +The following picture shows the components that make up the Exiv2 +library and how they depend on each other. The component names are the +same as the basenames of their source files. Each component has its +own header and source files.
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