MACROMEDIA DREAMWEAVER MX 2004-EXTENDING DREAMWEAVER Spécifications télécharger pdf (Page 461)

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The C-level API 461

The C-level API

The C-level extensibility API consists of the following functions:

typedef JSBool (*JSNative)(JSContext *cx,

JSObject *obj, unsigned int argc, jsval *argv, jsval

*rval)

Description

This function signature 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()

Description

This function registers a C-level function with the JavaScript interpreter in Dreamweaver.

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 is case-sensitive.

Typically, this function is called from the

MM_Init() function, which Dreamweaver calls

during startup.

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MACROMEDIA DREAMWEAVER MX 2004-EXTENDING DREAMWEAVER Spécifications Page 461

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