[Pharo-users] UFFI correct way to cast void*

Feb. 15, 2018

      Hi,

I'm trying to play with new UFFI system. It looks much easier then
NativeBoost, but unfortunately its hard to find any docs or examples.
I have problem with casting void* (ExternalAddress) into smalltalk object if
there is no hardcoded type in ffi method. And I really dislike the idea of
making many ffi methods, one for each required type.
In this example i can't understand how to make something like `address
castTo: type`

FFIExternalObject subclass: #Iterator

Iterator >> asCollectionOfType: aTypeName
	| result address type |

	result := OrderedCollection new.
	address := ExternalAddress new.
	type := FFIExternalType resolveType: aTypeName.
	[self iterator_next: address] whileTrue: [
		result add: (address castTo: type).
	].
    ^result

Iterator >> iterator_next: data
	^ self ffiCall: #(Boolean iterator_next (Iterator self, void** data))

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[Pharo-users] UFFI correct way to cast void*

Egor Scorik