El 30 de marzo de 2010 14:39, Mikael mikael.trash@gmail.com escribió:
You do this, by declaring the passed u8vector as a scheme-object in the c-lambda definition.
The memory pointer to the u8vector's contents in the C code is resolved by
void *u8vectorptr =___CAST(void*,&___FETCH_U8(___BODY(theu8vectorschemeobjectvariable),___INT(0)));
Remember that the pointer is only to be kept until the next return to Scheme.
Mikael
Thanks!! :)
May I ask where did you get this from? Gambit's source code? I can't find docs about this...
Álvaro
2010/3/30 Álvaro Castro-Castilla alvaro.castro.castilla@gmail.com
Hi!
Is there a way to pass a u8-vector to a FFI interface somehow? The way I expect this to work is through a (pointer unsigned-char), but it obviously doesn't work, claiming a proper C pointer. I would like to be able to build this arrays from Scheme code. Is there a way?
Currently I have to call a FFI function to set char by char, calling the c-lambda function too many times.
One thing that could work is something that converts u8-vectors to unsigned char* arrays, does that exist in Gambit?
Thanks,
Álvaro
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