I figured out the solution to my problem witch was how to output a std::string (std::basic_string) as a symbol.
std::string name = "the symbol to output"; //Create the std::string
const char *c_name = name.c_str ( ); //Convert it to a c_string... note that this is a const variable
outlet_symbol(x->name_out, gensym((char*) c_name)); //Cast the CONST c_string to a c_string and gensym it -----------------------------------
Thomas Ouellet Fredericks wrote:
Hi, I possess very little knowledge of C++ but I need to build a WIN32 PD external based on a third pardy API. My main problem is how do I output a String?
The external is for integration with a sensor system called Ubisense. In the following code snippet, I need to find the name of an Object (the name of a sensor) and output it throught a Pure Data outlet. Would it be easier to use outlet_symbol()? If so how?
if you want to output only one symbol (this reads: 1 single string (which *can* hold spaces but should rather not) then use outlet_symbol() (because that is what it is for)
//PROBLEMS START HERE array<char> namearray = name->ToCharArray() ; //???Convert theString to a char array???? outlet_anything(x->name_out, &s_symbol, name->Length , *namearray); //???Output the char array??? void outlet_anything(t_outlet *x, t_symbol *s, int argc, t_atom *argv);
outlet_anything() expects a list of "t_atom"s. a "t_atom" is *not* a character (or something you can arbitrarily choose) but a struct that is defined in m_pd.h and can hold a number OR a symbol OR a pointer.
to be precise, outlet_anything() is *very* similar to outlet_list(). the only difference is, that you can set the identifier (via the symbol "s") which is always "list" when using outlet_list().
so if you want to output several parameters at once (device-name, vendor-name, number of sensors), then use outlet_list() or outlet_anything().
if you just want to output the device-name as a symbol (the "normal" way, how pd handles "strings"), so you can use [select] or "$1"-substitution, use outlet_symbol(). the output will be "symbol foo".
if you want to output (only) the device-name as an "identifier" (the "other" way, how pd can handle "strings"), so you can use [route] but *not* "$1"-substitution, use outlet_anything(). the output will be "foo" (this is most likely *not* what you want)
mfg.a.sdr IOhannes
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