Hi Axel,
Axel Simon <[email protected]> writes:
> Hi Andy,
>
> I think your peekGdkPoint function and the mkIconInfo functions are fine.
> Could you search for
> array' in the docs and replace it with 'list'? Also all file paths should be
> of type FilePath, not
> String.
I see, i have improve those in my new patch.
>
> On May 6, 2010, at 17:15, Andy Stewart wrote:
>
>> +iconInfoGetAttachPoints :: IconInfo -> IO (Maybe ([Point], Int))
>> +iconInfoGetAttachPoints self =
>> + allocaArray 0 $ \pointPtr ->
>
> This is not right. You're passing an array of size 0. What you want to pass
> in is a pointer into
> which the function can write a pointer to a heap-allocated array. I.e.
>
> alloca $ \arrPtrPtr -> do
>> + alloca $ \nPointsPtr -> do
>> + success <- liftM toBool $
>> + {# call gtk_icon_info_get_attach_points #}
>> + self
> arrPtrPtr
>> + (castPtr pointPtr)
>> + nPointsPtr
>> + if success
>> + then do
> arrPtr <- peek arrPtrPtr
> nPoints <- peek nPointsPtr
> pointList <- peekArray nPoints arrPtr
> return (Just pointList)
>
>> + pointListPtrs <- peekArray 0 pointPtr
>> + pointList <- mapM peekPoint pointListPtrs
>> + {#call unsafe g_free#} (castPtr pointPtr)
>> + nPoints <- peek nPointsPtr
>> + return (Just (pointList, (fromIntegral nPoints)))
>> + else return Nothing
>
> You would need to create an instance of Storable for Point for this code to
> work.
Below code is okay?
------------------------------> new code start <------------------------------
instance Storable Point where
sizeOf _ = #{const sizeof(GdkPoint)}
alignment _ = alignment (undefined:: #gtk2hs_type gint)
peek ptr = do
(x_ ::#gtk2hs_type gint) <- #{peek GdkPoint, x} ptr
(y_ ::#gtk2hs_type gint) <- #{peek GdkPoint, y} ptr
return $ (fromIntegral x_, fromIntegral y_)
poke ptr (x, y) = do
#{poke GdkPoint, x} ptr ((fromIntegral x)::#gtk2hs_type gint)
#{poke GdkPoint, y} ptr ((fromIntegral y)::#gtk2hs_type gint)
-- | Fetches the set of attach points for an icon. An attach point is a
location in the icon that can be
-- used as anchor points for attaching emblems or overlays to the icon.
iconInfoGetAttachPoints :: IconInfo -> IO (Maybe [Point])
iconInfoGetAttachPoints self =
alloca $ \arrPtrPtr ->
alloca $ \nPointsPtr -> do
success <- liftM toBool $
{# call gtk_icon_info_get_attach_points #}
self
(castPtr arrPtrPtr)
nPointsPtr
if success
then do
arrPtr <- peek arrPtrPtr
nPoints <- peek nPointsPtr
pointList <- peekArray (fromIntegral nPoints) arrPtr
{#call unsafe g_free#} (castPtr arrPtrPtr)
return $ Just pointList
else return Nothing
------------------------------> new code end <------------------------------
As i have create Storable instance for Point, i remove `peekPoint` from
Structs.hsc, it's unnecessary.
Please point my error, i will improve it.
Thanks,
-- Andy
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