Upon further investigation, it seems my problem is using HaXml 1.13.2 and
HXT 8.3.0 in the same file. Furthermore I can't even import both HaXml and
HXT because they each pull in different versions of 'network' which is
causing the 'duplicate definition for symbol' problem. I can't think of a
workaround - so I guess it's one or the other.
Also is there any reason the cabal installed version of HaXml 1.13.3 is so
far behind the latest release 1.19.7? Is HXT, with a far more recent
release, preferable overall?
thanks,
deech
On Wed, Jun 3, 2009 at 12:42 AM, aditya siram
Hi all, I am trying to use HXT to parse an XML file. However whenever I try and run 'xread', GHCI crashes. The code and output are below.
The following code queries isbndb.com ( a book ISBN database ) which responds with XML describing the book. I am using 'xread' from HXT to parse the response into an XMLTree.
respHTML'' isbn = do rsp <- simpleHTTP (getRequest $ " http://isbndb.com/api/books.xml?results=details&access_key=" ++ key ++ "&index1=isbn&value1=" ++ isbn :: Request_String) case rsp of Left x -> putStrLn $ "Error " ++ (show x) Right r -> putStrLn $ show $ xread $ rspBody r
When I try this respHTML'' in GHCI usin the isbn for "Real World Haskell" , this is what I get:
*Main> respHTML'' rwhis Loading package syb ... linking ... done. Loading package base-3.0.3.1 ... linking ... done. Loading package array-0.2.0.0 ... linking ... done. Loading package containers-0.2.0.1 ... linking ... done. Loading package bytestring-0.9.1.4 ... linking ... done. Loading package old-locale-1.0.0.1 ... linking ... done. Loading package old-time-1.0.0.2 ... linking ... done. Loading package unix-2.3.2.0 ... linking ... done. Loading package filepath-1.1.0.2 ... linking ... done. Loading package directory-1.0.0.3 ... linking ... done. Loading package process-1.0.1.1 ... linking ... done. Loading package pretty-1.0.1.0 ... linking ... done. Loading package random-1.0.0.1 ... linking ... done. Loading package haskell98 ... linking ... done. Loading package parsec-2.1.0.1 ... linking ... done. Loading package network-2.2.1 ... linking ... done. Loading package mtl-1.1.0.2 ... linking ... done. Loading package parallel-1.1.0.1 ... linking ... done. Loading package HTTP-4000.0.6 ... linking ... done. Loading package HaXml-1.13.3 ... linking ... done. Loading package MaybeT-0.1.2 ... linking ... done. Loading package HUnit-1.2.0.3 ... linking ... done. Loading package curl-1.3.5 ... linking ... done. Loading package network-2.2.1.2 ...
GHCi runtime linker: fatal error: I found a duplicate definition for symbol my_inet_ntoa whilst processing object file /home/deech/.cabal/lib/network-2.2.1.2/ghc-6.10.3/HSnetwork-2.2.1.2.o This could be caused by: * Loading two different object files which export the same symbol * Specifying the same object file twice on the GHCi command line * An incorrect `package.conf' entry, causing some object to be loaded twice. GHCi cannot safely continue in this situation. Exiting now. Sorry.
It seems to want to load the 'network' package twice. Is this causing the trouble?
thanks , deech