[PD] opencv motion tracker external HELP!

[martin.peach at sympatico.ca]

> I dont think I quite understood.  I tried:
> 
> #define FRAMEOUT frame
> 
> IplImage *frame = 0;
> 
> x->x_outlet = outlet_new(&x->x_obj, &s_anything);
> outlet_anything(x->x_outlet, FRAMEOUT);
> 
> with the same results.  Maybe someone can dumb it down for me?

You can only work with atoms in pd's message system, and each atom usually contains a bang, a float or a symbol. You could convert the pointer to a float but it probably won't work because the pointer is a large integer that won't be accurately represented as a float. You could convert the pointer to a symbol using something like: 
char symstr[10];
t_symbol sym;
sprintf(symstr, "%p", frame);
sym = gensym(symstr);
...then send sym through the outlet and convert it back to a pointer at the receiving end by extracting the string from the s_name field of the symbol and passing it to atol().

Martin