[Haskell-beginners] exception, not in IO
k.bleijenberg at lijbrandt.nl
Sun Jul 14 11:47:07 CEST 2013
The app I'am working on, converts a jsonString to another string encoding.
The function I want to write is jsonString -> (encoding, errorMsg) so
String-> (String, String)
For this purpose I have a typeable datastructure Glass. Because it is
typeable I can do (decodeJSON jsonString) :: Glass
But sometimes the jsonString is not valid (misformed or wrong fields).
decodeJSON then throws a exception. I want to
catch that exection and transform the result to something like ("" ,
theErrorMsg). Unfortunately all catch functions want IO parameters.
What can I do?
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Beginners