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CHAPTER 7: Integrating External Libraries Defining entry points for direct access 204

X string

— Must be UTF-8 encoded.

The library must define an entry point ESFreeMem()

, which ExtendScript calls to release a returned

string pointer. If this entry point is missing, ExtendScript does not attempt to release any returned

string data.

X Script — A string to be evaluated by ExtendScript. Use to return small JavaScript scripts that define

arbitrarily complex data.

If, when a function is invoked, a supplied parameter is undefined, ExtendScript sets the data type to

undefined and does not attempt to convert the data to the requested type.

OTE: The data type of a return value cannot be predefined; JavaScript functions can return any data type.

The called function is free to return any of the listed data types.

Library initialization

ExtendScript calls ESInitialize() to initialize the library.

X The function receives an argument vector containing the additional arguments passed in to the

ExternalObject constructor.

X The function can return an array of function name-signature strings, which are used to support the

ExtendScript reflection interface

, and to cast function arguments to specific types. You do not need to

define a signature for a function in order to make it callable in JavaScript.

Function signatures

If you choose to return a set of function name-signature strings, each string associates a function name

with that function’s parameter types, if any. For example:

["functionName1_argtypes", "functionName2_argtypes", "functionName3"]

For each function, the string begins with the function name, followed by an underscore character and a list

of argument data types, represented as a single character for each argument. If the function does not have

arguments, you can omit the trailing underscore character (unless there is an underscore in the function

name).

The characters that indicate data types are:

Any type. The argument is not converted. This is the default, if no type is supplied or if a type

code is unrecognized.

Boolean

signed 32 bit integer

unsigned 32 bit integer

64 bit floating point

String

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EDOBE XDOM TAKE 6 IR - PRODUCTSHEET Especificações Página 204