Win32 package should bind SHGetFolderPath

Currently Cabal binds this function so that we can find the "Program Files" directory on Windows:

foreign import stdcall unsafe "shlobj.h SHGetFolderPathA"
 c_SHGetFolderPath :: Ptr () -> CInt -> Ptr () -> CInt -> CString -> IO CInt

This is fine except that it does not work in ghci because we have no way to tell ghci that it would need to link to shell32.dll. As it happens we do not have to tell the static linker to use shell32.dll because it appears to link to it by default. This of course means that runghc Setup does not work on Windows for Cabal itself which trips up many users. The fact that the README tells people to use ghc --make Setup instead doesn't help a great deal. See Cabal ticket #325

What would be nice is if the Win32 package would bind SHGetFolderPath. Then we just import it from the Win32 package and it'll work in ghci. Apparently, according to MSDN, this function is technically deprecated, however the replacement SHGetKnownFolderPath is only available in Vista and later so we probably need to bind it anyway. Note that SHGetFolderPath is in shell32.dll except on Windows 2000 which include it in SHFolder.dll which come with IE4 and later.

Trac metadata

Trac field	Value
Version	6.10.1
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries (other)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture