gtk2hs在windows下讀取utf8文件，顯示出來會出現亂碼。
根據下面資料使用utf8-string進行utf8文本文件的讀寫操作，就能解決亂碼問題。
注：用Windows自帶的記事本新建的utf8文件開頭有一個UTF8字符，即三個字節：/239/187/191。
參考：
http://hackage.haskell.org/package/utf8-string
http://www.haskell.org/haskellwiki/UTF-8
http://zincer.blogbus.com/logs/49781044.html
官方示例代碼 @ http://www.haskell.org/haskellwiki/UTF-8
import System.IO.UTF8
import Prelude hiding (readFile, writeFile)
import System.Environment (getArgs)
main :: IO ()
main =
do args <- getArgs
mapM_ reverseUTF8File args
reverseUTF8File :: FilePath -> IO ()
reverseUTF8File f =
do c <- readFile f
writeFile (f ++ ".rev") $ reverseLines c
where
reverseLines = unlines . map reverse . lines
本人代碼：
-- file: main.hs
module Main where
import Graphics.UI.Gtk
import Graphics.UI.Gtk.Glade
import System.IO.UTF8
import Prelude hiding (readFile, writeFile, putStrLn, print)
main = do
initGUI
-- load up the glade file
dialogXmlM <- xmlNew "gbhs.glade"
let dialogXml = case dialogXmlM of
(Just dialogXml) -> dialogXml
Nothing -> error "can't find the glade file /"simple.glade/" /
/in the current directory"
-- get a handle on a couple widgets from the glade file
window <- xmlGetWidget dialogXml castToWindow "dialog1"
button1 <- xmlGetWidget dialogXml castToButton "button1"
button2 <- xmlGetWidget dialogXml castToButton "button2"
entry <- xmlGetWidget dialogXml castToEntry "entry1"
-- do something with the widgets, just to prove it works
button1 `onClicked`
do
text <- readFile "utf8.txt"
entrySetText entry text
--putStrLn text
button2 `onClicked`
do
text <- entryGetText entry
writeFile "utf8.txt" text
--putStrLn text
window `onDestroy` mainQuit
-- show everything
widgetShowAll window
mainGUI
gbhs.glade文件：
<?xml version="1.0"?>
<glade-interface>
<!-- interface-requires gtk+ 2.16 -->
<!-- interface-naming-policy project-wide -->
<widget class="GtkDialog" id="dialog1">
<property name="border_width">5</property>
<property name="title" translatable="yes">用utf8-string读写utf8文件</property>
<property name="type_hint">normal</property>
<property name="has_separator">False</property>
<child internal-child="vbox">
<widget class="GtkVBox" id="dialog-vbox1">
<property name="visible">True</property>
<property name="orientation">vertical</property>
<property name="spacing">2</property>
<child>
<widget class="GtkEntry" id="entry1">
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="invisible_char">●</property>
</widget>
<packing>
<property name="position">1</property>
</packing>
</child>
<child internal-child="action_area">
<widget class="GtkHButtonBox" id="dialog-action_area1">
<property name="visible">True</property>
<property name="layout_style">end</property>
<child>
<widget class="GtkButton" id="button1">
<property name="label" translatable="yes">读文件（Read）</property>
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="receives_default">True</property>
</widget>
<packing>
<property name="expand">False</property>
<property name="fill">False</property>
<property name="position">0</property>
</packing>
</child>
<child>
<widget class="GtkButton" id="button2">
<property name="label" translatable="yes">写文件（Write）</property>
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="receives_default">True</property>
</widget>
<packing>
<property name="expand">False</property>
<property name="fill">False</property>
<property name="position">1</property>
</packing>
</child>
</widget>
<packing>
<property name="expand">False</property>
<property name="pack_type">end</property>
<property name="position">0</property>
</packing>
</child>
</widget>
</child>
</widget>
</glade-interface>
