[PD-dev] Was [PD] Help with writing externals

[zmoelnig at iem.at]

Zitiere thewade <pdman at aproximation.org>:

probably you should have a look at objects that provide a similar I/O-interface
like yours and copy'n'paste from that.

one remark:
 mixing dsp and message inlets is no problem, but you clearly haven't got the
concept behind it ;-)
your dsp_add() should definitely look like
dsp_add(fftbin_tilde_perform, 3, ref, sp[0]->s_vec, sp[0]->s_n);
this is: if you want to generate a message-output from one signal input and one
message-input.
you normally don't pass data from the control-inlet to the perform-routine via a
separate argument to the dsp_add but rather it is part of the object's structure
("ref").

furthermore: if you only want to get the n'th element of the signal-vector there
are probably other ways (without a need for your own external):
e.g: 
plain pd: [tabsend~] plus [tabread]
with zexy: [unpack~] plus [packel]
with others i don't know, but i believe there are solutions like stars in the sky.

but of course there is some charme in having written your own external...

mfg.a.dr
IOhannes