How to pass a C string to a Ruby method using mruby?

Question

I am getting started with C and mruby. I have a program that calls to a Ruby function using the mruby mrb_load_string function. I want to pass the argument from the C function to the Ruby function. How can I achieve this?

void on_key(const char *key) {
  mrb_load_string(mrb, "input_received()"); // how do I pass key as an argument?
}

Answer 1

If your ruby function takes a string as a parameter input, then:

void on_key(const char *key) {
  char arg[64];
  sprintf(arg,"input_received(\"%s\")",key);//Embed key as an argument to the function
  mrb_load_string(mrb, arg); 
}

should do what you wanted.