[Haskell-cafe] Lazy problem ?

[zaxis]

good_ssq_red:: IO [Int]
good_ssq_red =do { 
    samp <- fmap str2Ints $ readFile "ssqHitNum.txt";
    return $ statis samp;
} 
It works now !  thank you


Bulat Ziganshin-2 wrote:
> 
> Hello zaxis,
> 
> Friday, October 23, 2009, 11:15:01 AM, you wrote:
> 
>> good_ssq_red = withFile "ssqHitNum.txt" ReadMode (\h -> do {
>>         samp <- fmap str2Ints $ hGetContents h;
>>         print samp;    --without this line, the result will always
>> [1..16]
>>         return $ statis samp;
>>     })
> 
> withFile and hGetContents shouldn't be used together. both closes file
> handle and, here, withFile closes it before hGetContents lazily reads
> data. it's why you need to force reading with print
> 
> use readFile instead
> 
> 
> 
> -- 
> Best regards,
>  Bulat                            mailto:Bulat.Ziganshin at gmail.com
> 
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