Top |
SeedValue | (*SeedFunctionCallback) () |
SeedObject | seed_make_function () |
void | seed_create_function () |
Exposing native C functions to JavaScript is one of the fundamental use cases for libseed when used in an embedding environment; if your application cannot be introspected, or you only have a small number of functions to expose, this is the simplest way to do that.
All native C callbacks should have the prototype of SeedFunctionCallback()
.
Example 10. Simple C program which embeds Seed with one exposed function
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 |
#include <glib.h> #include <seed.h> /* Our function, with the signature of SeedFunctionCallback(); say hello! */ SeedValue hello_world(SeedContext ctx, SeedObject function, SeedObject this_object, gsize argument_count, const SeedValue arguments[], SeedException *exception) { g_print("Hello, World!\n"); return seed_make_null(ctx); } int main(gint argc, gchar ** argv) { SeedEngine * eng; /* Initialize the Seed engine */ eng = seed_init(&argc, &argv); /* Expose a C function to JavaScript */ seed_create_function(eng->context, "hello_world", (SeedFunctionCallback)hello_world, eng->global); /* Call the newly created JavaScript function */ seed_simple_evaluate(eng->context, "hello_world()", NULL); return 0; } |
SeedValue (*SeedFunctionCallback) (SeedContext ctx
,SeedObject function
,SeedObject this_object
,gsize argument_count
,const SeedValue arguments[]
,SeedException *exception
);
All native C function callbacks should use the prototype of SeedFunctionCallback.
ctx |
||
function |
The SeedObject representing the function |
|
this_object |
The SeedObject representing the "this" object in the caller |
|
argument_count |
The number of arguments passed into the callback |
|
arguments |
An array of SeedValues; the value of the arguments passed in |
|
exception |
A reference to a SeedException; use |
SeedObject seed_make_function (SeedContext ctx
,SeedFunctionCallback func
,const gchar *name
);
Creates a JavaScript object representing a first-class function; when
the function is called from JavaScript, func
will be called.
ctx |
A valid SeedContext |
|
func |
A SeedFunctionCallback to implement the function. |
|
name |
The name of the function (used in exceptions). |
void seed_create_function (SeedContext ctx
,gchar *name
,SeedFunctionCallback func
,SeedObject obj
);
Creates a JavaScript object representing a first-class function; when
the function is called from JavaScript, func
will be called. Places
the created function as the property name
on obj
.
ctx |
A valid SeedContext |
|
name |
The name of the function (used in exceptions). |
|
func |
A SeedFunctionCallback to implement the function. |
|
obj |
The SeedObject on which to put the function. |