[Haskell-cafe] System.Win32.Registry... Help?

[Anonymous Void]

Thank you!

I looked over a lot of the api docs, but not the source ones...

The snippit you found showed me exactly what I needed to do.

*Main> k <- regOpenKey hKEY_CURRENT_USER "Software\\7-Zip"
Loading package bytestring-0.9.2.1 ... linking ... done.
Loading package Win32-2.2.2.0 ... linking ... done.
*Main> withTString "A" $ \v -> regSetValueEx k "foo" rEG_SZ v (length "foo" *  s
izeOf(undefined :: TCHAR))

Works perfectly, so I can copy binary values too.
Didn't think to look at the helper functions to see how the regular
version is used from them...
Haven't programmed in a while, must be pretty rusty... LOL.

My project is now saved from going .py! :D
.. not anything against python, I'm using django on another project
and it's great,
but haskell comes to mind for this app....

Thanks.

On Sun, Jul 22, 2012 at 4:33 AM, Simon Peter Nicholls
<simon at mintsource.org> wrote:
> The Registry module has code that will be helpful, as it includes a
> helper function for the common use case of setting String values.
>
> regSetStringValue :: HKEY -> String -> String -> IO ()
> regSetStringValue hk key val =
>   withTString val $ \ v ->
>   regSetValueEx hk key rEG_SZ v (length val * sizeOf (undefined::TCHAR))
>
> http://www.haskell.org/ghc/docs/7.4.2/html/libraries/Win32-2.2.2.0/src/System-Win32-Registry.html
>
> On Sun, Jul 22, 2012 at 7:11 AM, Anonymous Void <bitsofchaos at gmail.com> wrote:
>> Hi,
>>
>> I'm working on a project that will require me to create and possibly
>> set registry keys.
>> I don't have much experience with programming on Windows either,
>> but I'm having to learn as you don't get many *nix PCs at a computer
>> repair shop, lol.
>>
>> I found a mailing list post showing how to read registry keys and was
>> able to make a function based off of it,
>> but I have no idea what to put into some of the arguments for
>> regSetValueEx or regCreateKeyEx, so I'm stuck.
>> Also, what's the best way to recursively traverse trees in the
>> registry, are there any functions for it?
>>
>> Can someone please help me out with this?
>> Thank you.
>>
>>
>> {-# LANGUAGE ForeignFunctionInterface #-}
>>
>> import System.Win32.Types
>> import System.Win32.Registry
>> import Foreign.Ptr (castPtr)
>> import Foreign.Marshal.Alloc (allocaBytes)
>> import Foreign.C.String (peekCWString, withCWString)
>> import Control.Exception (bracket, throwIO)
>>
>> -- // parse a string from a registry value of certain type
>> parseRegString :: RegValueType -> LPBYTE -> IO String
>> parseRegString ty mem
>>   | ty == rEG_SZ        = peekCWString (castPtr mem)
>>   | ty == rEG_EXPAND_SZ = peekCWString (castPtr mem) >>=
>>                           expandEnvironmentStrings
>>   | otherwise           = ioError (userError "Invalid registry value type")
>>
>> -- // FFI import of the ExpandEnvironmentStrings function needed
>> -- // to make use of the registry values
>> expandEnvironmentStrings :: String -> IO String
>> expandEnvironmentStrings toexpand =
>>   withCWString toexpand $ \input ->
>>   allocaBytes 512 $ \output ->
>>   do c_ExpandEnvironmentStrings input output 256
>>      peekCWString output
>> foreign import stdcall unsafe "windows.h ExpandEnvironmentStringsW"
>>   c_ExpandEnvironmentStrings :: LPCTSTR -> LPTSTR -> DWORD -> IO DWORD
>>
>> ----
>> get_key :: HKEY -> String -> String -> IO String
>> get_key cat loc key =
>>   bracket op regCloseKey $ \x ->
>>   allocaBytes 512 $ \mem ->
>>   do ty <- regQueryValueEx x key mem 512
>>      parseRegString ty mem
>>   where op = regOpenKeyEx cat loc kEY_QUERY_VALUE
>>
>> set_key :: HKEY -> String -> String -> IO ()
>> set_key cat loc key =
>>   regSetValueEx cat loc rEG_SZ??? "LPTSTR? What do I put here?"
>> magic_win32_number_here?
>>   where op = regOpenKeyEx cat loc kEY_SET_VALUE
>>
>> main = get_key hKEY_CURRENT_USER loc key >>= print
>>   where loc = "Software\\7-Zip"
>>         key = "Test"
>>
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