License	BSD-style
Maintainer	Vincent Hanquez <vincent@snarc.org>
Stability	experimental
Portability	portable
Safe Haskell	None
Language	Haskell2010

Foundation.IO

Contents

Terminal
File

Description

IO Routine

Synopsis

Terminal

putStrLn :: String -> IO () Source #

Print a string with a newline to standard output

putStr :: String -> IO () Source #

Print a string to standard output

stdin :: Handle #

A handle managing input from the Haskell program's standard input channel.

stdout :: Handle #

A handle managing output to the Haskell program's standard output channel.

File

data IOMode :: * #

See openFile

Constructors

ReadMode
WriteMode
AppendMode
ReadWriteMode

Instances

Enum IOMode
Methods succ :: IOMode -> IOMode # pred :: IOMode -> IOMode # toEnum :: Int -> IOMode # fromEnum :: IOMode -> Int # enumFrom :: IOMode -> [IOMode] # enumFromThen :: IOMode -> IOMode -> [IOMode] # enumFromTo :: IOMode -> IOMode -> [IOMode] # enumFromThenTo :: IOMode -> IOMode -> IOMode -> [IOMode] #
Eq IOMode
Methods (==) :: IOMode -> IOMode -> Bool # (/=) :: IOMode -> IOMode -> Bool #
Ord IOMode
Methods compare :: IOMode -> IOMode -> Ordering # (<) :: IOMode -> IOMode -> Bool # (<=) :: IOMode -> IOMode -> Bool # (>) :: IOMode -> IOMode -> Bool # (>=) :: IOMode -> IOMode -> Bool # max :: IOMode -> IOMode -> IOMode # min :: IOMode -> IOMode -> IOMode #
Read IOMode
Methods readsPrec :: Int -> ReadS IOMode # readList :: ReadS [IOMode] # readPrec :: ReadPrec IOMode # readListPrec :: ReadPrec [IOMode] #
Show IOMode
Methods showsPrec :: Int -> IOMode -> ShowS # show :: IOMode -> String # showList :: [IOMode] -> ShowS #
Ix IOMode
Methods range :: (IOMode, IOMode) -> [IOMode] # index :: (IOMode, IOMode) -> IOMode -> Int # unsafeIndex :: (IOMode, IOMode) -> IOMode -> Int inRange :: (IOMode, IOMode) -> IOMode -> Bool # rangeSize :: (IOMode, IOMode) -> Int # unsafeRangeSize :: (IOMode, IOMode) -> Int

openFile :: FilePath -> IOMode -> IO Handle Source #

list the file name in the given FilePath directory

TODO: error management and not implemented yet getDirectory :: FilePath -> IO [FileName] getDirectory = undefined

Open a new handle on the file

closeFile :: Handle -> IO () Source #

Close a handle

withFile :: FilePath -> IOMode -> (Handle -> IO r) -> IO r Source #

withFile filepath mode act opens a file using the modeand run act. the by-product handle will be closed when act finish, either normally or through an exception.

The value returned is the result of act@

hGet :: Handle -> Int -> IO (UArray Word8) Source #

Read binary data directly from the specified Handle.

First argument is the Handle to read from, and the second is the number of bytes to read. It returns the bytes read, up to the specified size, or an empty array if EOF has been reached.

hGet is implemented in terms of hGetBuf.

hPut :: Handle -> UArray Word8 -> IO () Source #

readFile :: FilePath -> IO (UArray Word8) Source #

Read a binary file and return the whole content in one contiguous buffer.