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=begin
= ruby-libexif - libexif ruby ȤΥ饤֥ꡣ
libexifEXIFեޥåȤΥ饿Ф뤿C饤֥Ǥܥ饤֥(({exif(1)}))Ʊεǽrubyڤ˰ȤŪȤƤޤ
libexif, exifˤĤƤϡ((<URL:http://libexif.sourceforge.net>))ȤƲ
= Ȥ
require 'exif'
# ȥǥ쥯ȥimage.jpgExif֥Ȥ롣
exif = Exif.new('image.jpg')
# Exif֥ȤǡͿ롣
exif = Exif.new
File.open('image.jpg') { |f| exif << f.read }
# ΥȥѤͤ롣
p exif["Manufacturer"] # -> "FUJIFILM"
# IDѤͤ롣
p exif['0xa001'] # -> "FUJIFILM"
#
# ߤΤȤ֤ͤʸ֥Ȥ줵Ƥޤ
# ޤȤơ3ĤɽͿ뤳ȤǤޤ
# exif["Manufacturer"] ; Υȥ
# exif["Make"] ; EXIF-2.1ǵꤵ줿̾
# exif[0xa001] ; ID16ɽʸ
# IFDˤäƵꤵƤ륿μϰۤʤޤ
# (({Exif#ifd=}))ˤäŪIFDꤷʤ¤ꡢƤIFDоݤˤ
# õФб֤ͤȤޤŪIFDꤷ塢
# Τ褦ưᤷȤϡ(({Exif#ifd=}))ΰ
# (({Exif::IFD::Any}))(ŪѰդ⥸塼)ꤷƲ
#
# ξܺ٤ˤĤƤϡ(({Exif.[]}))ѤĴ٤뤳ȤǤޤ
# ޤIFDˤѲǽʥˤĤƤ(({Exif#list_tags}))
# ѤĴ٤뤳ȤǤޤ)
# ͥФե¸롣
File.open('thumb.jpg', 'wb') {|dest| exif.thumbnail(dest)}
# ͥꤹ롣¸ߤ륵ͥ˴롣
File.open('src.jpg', 'rb'){|src| exif.thumbnail = src.read }
= ե
== class Exif
=== 饹å
--- Exif.new
ǡExif֥Ȥޤ
--- Exif.new(fpath)
(({fpath}))ǻꤵ륤ɤߡExif֥ȤޤEXIFեޥåȤǤϤʤ硢㳰((<Exif::Error::NotExifFormat>))ȯޤ
--- Exif.[](tagid)
ʸͤǻꤵ((|tagid|))˴ؤޤ֤ͤ
['Υȥ', ['̾', '', 'ID()']]
Ǥ
=== å
--- Exif#load(fpath)
--- Exif#data=(str)
--- Exif#<<(str)
rubyString֥ȤͿ줿ǡ˥åȤޤǤ˥ǡåȤƤˤϡ˴ޤ
--- Exif#list_tags(ifd)
IFD ((|ifd|)) Ƥ륿ΥꥹȤ֤ޤǤ
["Υȥ", "ID('0xdddd')"]
ȤǤ((|ifd|))ˤ((<Exif::IFD>))ʲѤƲ
--- Exif#byte_order
ΥХȥ֤ޤ֤ͤ((<Exif::ByteOrder>))ͤǤ
--- Exif#ifd
ߤIFD(Image File Directory)ʸ֤ޤ
--- Exif#ifd=(ifd)
IFD(Image File Directory)ꤷޤ((|ifd|))((<Exif::IFD>))ʲѤƲ
--- Exif#[](tag)
ƤIFDϤäͿ줿(({tag}))Ĵ١бͤʸ֤ޤ((<Exif#ifd=>))ŪIFDꤷϡIFDˤƥƤСб֤ͤޤƤʤˤϡ㳰((<Exif::Error::TagNotFound>))ȯޤưᤷϡ((<Exif#ifd=>))((<Exif::IFD::Any>))ꤷƲ
--- Exif#each_entry(use_tag_id=false) {|tag, value| ...}
˴ޤޤ륿Υȥ(({tag}))ͤ(({tag}))Ȥơ֥å¹Ԥޤ((|use_tag_id|))(({true}))ΤȤ(({tag}))ˤϥID('0xdddd'ɽ)ޤ
--- Exif#extract_thumbnail(dest)
--- Exif#thumbnail(dest)
˴ޤޤ륵ͥ((|dest|))(({dest#<<}))Ѥƽߤޤ
== ⥸塼
== Exif::IFD
IFDμɽ
--- Exif::IFD::Zero
--- Exif::IFD::One
--- Exif::IFD::EXIF
--- Exif::IFD::GPS
--- Exif::IFD::Interoperability
--- Exif::IFD::Any
== Exif::ByteOrder
EXIFΥХȥɽ
--- Exif::ByteOrder::INTEL
--- Exif::ByteOrder::MOTOROLA
== 㳰饹
RuntimeError --- Exif::Error -+- Exif::Error::NotExifFormat
|- Exif::Error::InvalidIFD
`- Exif::Error::TagNotFound
--- Exif::Error
ruby-libexif㳰Ƥ㳰ޤϰʲΥ֥饹㳰°ޤ
--- Exif::Error::ExifFormat
Ϳ줿EXIFեޥåȤŬ礷Ƥʤ硢㳰ȯޤ
--- Exif::Error::InvalidIFD
((<Exif#ifd=>))ǡIFDꤷˡ㳰ȯޤ
--- Exif::Error::TagNotFound
((<Exif#[]>))ǡTagߤIFDǸĤʤäˡ㳰ȯޤ
--- Exif::Error::ThumbnailNotFound
((<Exif#thumbnail>))ǡ˥ͥ뤬ޤޤʤˡ㳰ȯޤ
=end
|
