zknx https://blog.hatena.ne.jp/zknx/ zknxの日記 https://zknx.hatenadiary.org/ Haskell hGetContents に渡したハンドラを hClose すると、hGetContents の結果が空文字列になる。 import IO (openFile, IOMode(ReadMode), hGetContents, hClose, bracket) f1 = do h <- openFile "hoge.txt" ReadMode s <- hGetContents h return s f2 = bracket (openFile "hoge.txt" ReadMode) (hClose) (hGetContents) main = do run "f1" f1 run "f2" … 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fzknx.hatenadiary.org%2Fentry%2F20090626%2F1245978078" title="hGetContents と hClose - zknxの日記" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2009-06-26 10:01:18 rich https://zknx.hatenadiary.org/entry/20090626/1245978078 1.0 100%