El 30 de marzo de 2010 14:39, Mikael <span dir="ltr">&lt;<a href="mailto:mikael.trash@gmail.com">mikael.trash@gmail.com</a>&gt;</span> escribió:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">

You do this, by declaring the passed u8vector as a scheme-object in the c-lambda definition.<div><br></div><div>The memory pointer to the u8vector&#39;s contents in the C code is resolved by</div><div><br></div><div><div>

     void *u8vectorptr = ___CAST(void*,&amp;___FETCH_U8(___BODY(theu8vectorschemeobjectvariable),___INT(0)));</div>
<div><br></div><div>Remember that the pointer is only to be kept until the next return to Scheme.</div><div> </div></div></blockquote><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">

<div><div>Mikael</div></div></blockquote><div><br></div><div><br></div><div>Thanks!! :)</div><div><br></div><div>May I ask where did you get this from? Gambit&#39;s source code? I can&#39;t find docs about this...</div><div>

<br></div><div>Álvaro</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div><br><div class="gmail_quote">2010/3/30 Álvaro Castro-Castilla <span dir="ltr">&lt;<a href="mailto:alvaro.castro.castilla@gmail.com" target="_blank">alvaro.castro.castilla@gmail.com</a>&gt;</span><br>


<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>Hi!<br></div><div><br></div><div>Is there a way to pass a u8-vector to a FFI interface somehow?</div><div>The way I expect this to work is through a (pointer unsigned-char), but it obviously doesn&#39;t work, claiming a proper C pointer. I would like to be able to build this arrays from Scheme code. Is there a way?</div>




<div><br></div><div>Currently I have to call a FFI function to set char by char, calling the c-lambda function too many times.</div><div><br></div><div>One thing that could work is something that converts u8-vectors to unsigned char* arrays, does that exist in Gambit?</div>




<div><br></div><div><br></div><div>Thanks,</div><div><br></div><font color="#888888"><div>Álvaro</div>
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