Hello! Leon Henrik Plickat <leonhenrik.plic...@stud.uni-goettingen.de> writes: > [...] > > Must the program run in guile mode the entire time, or can I enter > it only temporarily for eval'ing the script and calling the function?
I think 'scm_init_guile' is for the entire time, and 'scm_with_guile' is for the temporarily usage. > What is the canonical way of eval'ing a script to get a function > definition from C? Use 'scm_c_primitive_load' to load and eval a script, if the script return a function as its last value, then it's done. Else use 'scm_c_lookup' to get the function as a varaible. > Can I check after eval'ing the script whether the function I want the > user to define exists? Probably with scm_c_eval_string() again, but > I wonder if there is some other more way that is considered to be > better. It seems 'scm_module_variable' returns '#f' when the variable binding doesn't exist. > > I am working my way through the API reference, but decided to ask > for some input in the meantime. Procedures needed are described in manual section "6.18.10 Accessing Modules from C". The flow are: - Enter guile mode via 'scm_init_guile', 'scm_boot_guile', or 'scm_with_guile'. - Load and eval script via 'scm_c_primitive_load'. - Get SCM variables via 'scm_c_lookup', 'scm_module_variable' - Dereference variables via 'scm_variable_ref' to procedures SCM. - Call procedures via 'scm_call', 'scm_call_1, etc. Hope it helps!
