[Haskell-cafe] Newbie question about Read strings in a line of File
hiperfume at gmail.com
Tue Jul 26 10:52:43 EDT 2005
Now I am writing a module to handles messages of a system. The
messages are stored in a file. The content of each line of the file
1 001 001 Error message 1
1 001 002 Error message 2
1 002 001 Warning message 1
in which: The first word is the language Code (e.g: 1 is English, 2 is
French), the second is type of messages (e.g: 001 is error message,
002 is warning message,etc), the third is the index number of
messages, and the last is the message. I need to read 3 first words of
each line and assign them to 3 variables. After that, I need to show
the error message based on the tuple of those 3 first variable, e.g:
errMsg("1","001","001") = "Error message 1"
At first, I tried to read only one first line of the file as follows:
main = do hdl <- openFile "message.txt" ReadMode
msgLine <-hGetLine hdl
--stdMsg: cut space at the begining of the line.
let stdMsg = dropWhile(not.isSpace) msgLine
-Assign langCode with the first word of the line.
let langCode = takeWhile(not.isSpace) stdMsg
However, after that, I do not know how to read second element, third
element of the line. And how to read continuous next line after first?
Please help me. Thanks a lot.
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