Passing a list as a argument via C

Hi to all,

I've a little problem with my C interface to Prolog.
I need to pass a list as an argument to my Prolog query, and i tried to use
PlTail but it didn't work.
This is my code:

PlTermv argomentiVar((int)req.arg.size());

for(int i=0; i<(int)req.arg.size(); ++i){
    if (req.arg[i][0] == '[')
    {

       PlTail list(argomentiVar[i]);
        string substring = req.arg[i].substr(1,req.arg[i].length()-2);
        char* tokens = strtok((char *)substring.c_str(), ",");
        while(tokens != NULL) {
        list.append(tokens);
        tokens = strtok(NULL,",");

    }
    list.close();
    }
}

PlString PlS = PlString(req.predicate.c_str());
PlQuery eF(PlS, argomentiVar);

I want PlTail to be an argument of tipe list, as for the query eF, for
example [a,b,c,d].

Thank you
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