Am 11.01.2004 um 13:27 schrieb Alexander Lazarević:

> I'm calling a function in a shared library using FFI. One of the 
> parameters
> needs to be a pointer to an array of floats. The code below works, but 
> I
> think I missed to find something more handy to create/fill an array 
> and get a
> pointer to it?
>
> | ctrlpoints addr data |
> ctrlpoints := { -4.0. -4.0. 0.0.
> 		-2.0.  4.0. 0.0.
> 		 2.0. -4.0. 0.0.
> 		 4.0.  4.0. 0.0 }.
> data := ByteArray new: ctrlpoints size * ExternalType float byteSize.
> 1 to: ctrlpoints size do: [:i|
> 	data
> 	   floatAt: ((i-1)*ExternalType float byteSize + 1)
> 	   put: (ctrlpoints at: i)].
> 	addr := ExternalData fromHandle: data type: ExternalType float.
> [...]

Looks as simple as it gets to me. You could try to use a FloatArray 
directly with FFI, but IIRC the only array allowed for FFI callswas 
ByteArray.

- Bert -