Hi,
I'm continuing to experiment with HDirect and the ihc compiler. Trying the
"huge" type libraries from Office applications (Word, Excel...), I've met the
following issue: some Haskell stubs do not compile out of the box, essentially
because of type mismatch between the type signature generated by the ihc
compiler and the stub's code.
For instance:
> Excel.hs:32:25:
No instance for (Automation.Variant a0)
arising from use of `Automation.outVariant' at Excel.hs:32:25-45
Possible fix:
add (Automation.Variant a0)
to the type signature(s) for `global_getActiveCell'
The faulty declaration is indeed :
global_getActiveCell :: Global a1 -> Prelude.IO a0
global_getActiveCell = Automation.propertyGet "ActiveCell" []
Automation.outVariant
whereas the correct type is (Automation.Variant a0) => Global a1 -> Prelude.IO
a0
There are also some cases where there is a type mismatch between "Int64" and
"Automation.Date" type, but the essence of the error is the same : the type
signature does not
match the method's stub's code.
I've looked for an option in the compiler that would help (for instance, I
suppose that removing all type signatures from the haskell file would allow to
compile it), but I haven't found one.
NB : the ihc command line was "../src/ihc.exe --tlb -fautomation
-fprefix-interface-name -fmaybe-optional-params -v XL5EN32.OLB
(where the OLB file is Excel's type library).
Did anyone experienced similar issue ?
Thanks in advance,
sL
PS: the COM library (without Automation) works well.
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