I think I figured it out. It looks like I have to use t_symbol *sym instead of t_symbol sym and the outlet has to be x->outlet_symbol(x-

x_outlet0, &*sym). That seemed to work. The weird problem I am

having now it I get an error with the return(void *)x; I get error: Error: return-statement with a value, in function returning 'void'. Now I see return(void *)x; on almost all the external codes so I don't get it. I am also getting an error on the void your_class_setup (void) { part too. Error: a function-definition is not allowed here before '{' token. I am confused. Any help would be apreciated. Thanks, Alain

On May 29, 2007, at 4:15 PM, nosehair911@bellsouth.net wrote:

I am trying to write a set of externals based on the opencv library. My main interest is in the motion tracking aspect of opencv. I am new to programing and I am having a tough time converting the opencv IplImage data type to the Pd symbol data type in order to send it out of outlets and in to inlets. Martin suggested I try something like this: char symstr[10]; t_symbol sym; sprintf(symstr, "%p", frame); sym = gensym(symstr); and then send sym through the outlet and convert it back at the receiving end by extracting the sting from the s_name field and passing it to atol(). But I get this error when I use sym = gensym(symstr); no match for 'operator=' in 'sym = gensym(((char*)(& symstr)))'. Does anyone know how to get around this? Thanks, Alain

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