The C-level API
377
typedef JSBool (*JSNative)(JSContext *cx, JSObject *obj, unsigned int
argc, jsval *argv, jsval *rval)
Description
Method: describes C-level implementations of JavaScript functions in the following situations:
•
The
cx
pointer is a pointer to an opaque
JSContext
structure, which must be passed to some
of the functions in the JavaScript API. This variable holds the interpreter’s execution context.
•
The
obj
pointer is a pointer to the object in whose context the script executes. While the script
is running, the
this
keyword is equal to this object.
•
The
argc
integer is the number of arguments being passed to the function.
•
The
argv
pointer is a pointer to an array of
jsval
structures. The array is
argc
elements
in length.
•
The
rval
pointer is a pointer to a single
jsval
structure. The function’s return value should
be written to
*rval
.
The function returns
JS_TRUE
if successful;
JS_FALSE
otherwise. If the function returns
JS_FALSE
, the current script stops executing and an error message appears.
JSBool JS_DefineFunction()
Usage
JSBool JS_DefineFunction(unsigned short *name, JSNative call, unsigned int
nargs)
Description
Method; registers a C-level function with the JavaScript interpreter in Flash. After the
JS_DefineFunction()
function registers the C-level function that you specify in the
call
argument, you can invoke it in a JavaScript script by referring to it with the name that you specify
in the
name
argument. The
name
argument is case-sensitive.
Typically, this function is called from the
MM_Init()
function, which Flash calls during startup.
Arguments
unsigned short *
name
,
JSNative
call
,
unsigned int
nargs
•
The
name
argument is the name of the function as it is exposed to JavaScript.
•
The
call
argument is a pointer to a C-level function. The function must return a
JSBool
,
which indicates success or failure.
•
The
nargs
argument is the number of arguments that the function expects to receive.
Returns
A Boolean value:
JS_TRUE
indicates success;
JS_FALSE
indicates failure.
Содержание FLASH MX 2004-FLASH JAVASCRIPT DICTIONARY
Страница 1: ...Flash JavaScript Dictionary ...
Страница 16: ...16 Contents ...
Страница 40: ...40 Chapter 2 Top level functions ...
Страница 368: ...368 Chapter 3 Objects ...
Страница 386: ...386 Chapter 4 C Level Extensibility ...