Adobe Extending Flash Professional CS4 Manual do Utilizador descarregar pdf (Página 544)

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Chapter 53: C-Level Extensibility

This chapter describes the C-level extensibility mechanism, which lets you implement Adobe Flash CS4 Professional

extensibility files using a combination of JavaScript and custom C code. No changes to the mechanism have been

introduced in this release of Flash.

About extensibility

To implement extensibility, you define functions using C, bundle them in a dynamic linked library (DLL) or a shared

library, save the library in the appropriate directory, and then call the functions from JavaScript using the Adobe Flash

JavaScript API.

For example, you might want to define a function that performs intense calculations more efficiently than JavaScript

does, which improves performance, or when you want to create more advanced tools or effects.

This extensibility mechanism is a subset of the Adobe Dreamweaver CS3 API. If you are familiar with that API, you

might recognize the functions in the C-level extensibility mechanism API. However, this API differs from the

Dreamweaver API in the following ways:

• This API does not contain all the commands in the Dreamweaver API.

• All declarations of type wchar_t and char in the Dreamweaver API are implemented as unsigned short

declarations in this API, to support Unicode when strings are passed.

• The JSVal JS_BytesToValue() function in this API is not part of the Dreamweaver API.

• The location in which the DLL or shared library files must be stored is different (see “Integrating C functions” on

page 522).

Integrating C functions

The C-level extensibility mechanism lets you implement Flash extensibility files using a combination of JavaScript and

C code. The process for implementing this capability is summarized in the following steps:

1 Define functions using the C or C++ language.

2 Bundle them in a DLL file (Windows) or a shared library (Macintosh).

3 Save the DLL file or library in the appropriate location:

• Windows Vista:

boot drive\Users\username\Local Settings\Application Data\Adobe\Flash

CS3\language\Configuration\External Libraries

• Windows XP:

boot drive\Documents and Settings\username\Local Settings\Application Data\Adobe\Flash

CS3\language\Configuration\External Libraries

• Mac OS X:

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