Exiv2::ExifKey Class Reference

Concrete keys for Exif metadata and access to Exif tag reference data. More...

#include <tags.hpp>

Inheritance diagram for Exiv2::ExifKey:

Classes
struct	Impl
	Internal Pimpl structure with private members and data of class ExifKey. More...

Public Types
typedef std::auto_ptr< ExifKey >	AutoPtr
	Shortcut for an ExifKey auto pointer.
Public Types inherited from Exiv2::Key
typedef std::auto_ptr< Key >	AutoPtr
	Shortcut for a Key auto pointer.

Public Member Functions
Creators
	ExifKey (const std::string &key)
	Constructor to create an Exif key from a key string. More...
	ExifKey (uint16_t tag, const std::string &groupName)
	Constructor to create an Exif key from the tag number and group name. More...
	ExifKey (const TagInfo &ti)
	Constructor to create an Exif key from a TagInfo instance. More...
	ExifKey (const ExifKey &rhs)
	Copy constructor.
virtual	~ExifKey ()
	Destructor.
Manipulators
ExifKey &	operator= (const ExifKey &rhs)
	Assignment operator.
void	setIdx (int idx)
	Set the index.
Accessors
virtual std::string	key () const
	Return the key of the metadatum as a string. The key is of the form 'familyName.groupName.tagName'. Note however that the key is not necessarily unique, e.g., an ExifData may contain multiple metadata with the same key.
virtual const char *	familyName () const
	Return an identifier for the type of metadata (the first part of the key)
virtual std::string	groupName () const
	Return the name of the group (the second part of the key)
int	ifdId () const
	Return the IFD id as an integer. (Do not use, this is meant for library internal use.)
virtual std::string	tagName () const
	Return the name of the tag (which is also the third part of the key)
virtual uint16_t	tag () const
	Return the tag number.
virtual std::string	tagLabel () const
	Return a label for the tag.
std::string	tagDesc () const
	Return the tag description.
TypeId	defaultTypeId () const
	Return the default type id for this tag.
AutoPtr	clone () const
int	idx () const
	Return the index (unique id of this key within the original Exif data, 0 if not set)
Public Member Functions inherited from Exiv2::Key
virtual	~Key ()
	Destructor.
AutoPtr	clone () const
	Return an auto-pointer to a copy of itself (deep copy). The caller owns this copy and the auto-pointer ensures that it will be deleted.
std::ostream &	write (std::ostream &os) const
	Write the key to an output stream. You do not usually have to use this function; it is used for the implementation of the output operator for Key, operator<<(std::ostream &os, const Key &key).

Additional Inherited Members
Protected Member Functions inherited from Exiv2::Key
Key &	operator= (const Key &rhs)
	Assignment operator. Protected so that it can only be used by subclasses but not directly.

Detailed Description

Concrete keys for Exif metadata and access to Exif tag reference data.

Examples:

addmoddel.cpp, and mrwthumb.cpp.

Constructor & Destructor Documentation

ExifKey() [1/3]

Exiv2::ExifKey::ExifKey ( const std::string &  key )

explicit

Constructor to create an Exif key from a key string.

Parameters

key	The key string.

Exceptions

Error

if the first part of the key is not 'Exif' or the remainin parts of the key cannot be parsed and converted to a group name and tag name.

References key().

ExifKey() [2/3]

Exiv2::ExifKey::ExifKey	(	uint16_t	tag,
		const std::string &	groupName
	)

Constructor to create an Exif key from the tag number and group name.

Parameters

tag	The tag value
groupName	The name of the group, i.e., the second part of the Exif key.

Exceptions

Error

if the key cannot be constructed from the tag number and group name.

References Exiv2::Internal::groupId(), groupName(), ifdId(), Exiv2::Internal::isExifIfd(), Exiv2::Internal::isMakerIfd(), tag(), and Exiv2::Internal::tagInfo().

ExifKey() [3/3]

Exiv2::ExifKey::ExifKey ( const TagInfo &  ti )

explicit

Constructor to create an Exif key from a TagInfo instance.

Parameters

ti	The TagInfo instance

Exceptions

Error

if the key cannot be constructed from the tag number and group name.

References ifdId(), Exiv2::TagInfo::ifdId_, Exiv2::Internal::isExifIfd(), Exiv2::Internal::isMakerIfd(), and Exiv2::TagInfo::tag_.

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The documentation for this class was generated from the following files:

• tags.hpp
• tags.cpp