Unexported Primitive Functions
Parts of the foreign.ss libray are implemented by the MzScheme
built-in #%foreign module. The #%foreign
module is not intended for direct use, but it exports the following
procedures. If you find any of these useful, please let us know.
(ffi-obj objname ffi-lib-or-libname) PROCEDURE
Pulls out a foreign object from a library, returning a Scheme value that can be
used as a pointer. If a name is provided instead of a library object,
ffi-lib is used to create a library object.
(ffi-obj-lib ffi-obj) PROCEDURE
(ffi-obj-name ffi-obj) PROCEDURE
A predicate for objects returned by ffi-obj, and accessor functions
that return its corresponding library object and name. These values can also
be used as C pointer objects.
(ctype-basetype ctype) PROCEDURE
(ctype-scheme->c ctype) PROCEDURE
(ctype-c->scheme ctype) PROCEDURE
Accessors for the components of a C type object, made by make-ctype.
ctype-basetype returns #f for primitive types (including
cstruct types).
(ffi-call ptr in-types out-type) PROCEDURE
The primitive mechanism that creates Scheme ``callout'' values. The
given ptr (any pointer value, including ffi-obj values) is
wrapped in a Scheme-callable primitive function that uses the types to specify
how values are marshaled.
(ffi-callback proc in-types out-type) PROCEDURE
The symmetric counterpart of ffi-call. It receives
a Scheme procedure and creates a callback object, which can also be used as a
pointer. This object can be used as a C-callable function, which invokes
proc using the types to specify how values are marshaled.
A predicate for callback values that are created by ffi-callback.