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CHAPTER 7: Integrating External Libraries Defining entry points for indirect access 214

TaggedData

The TaggedData structure is used to communicate data values between JavaScript and shared-library

C/C++ code. Types are automatically converted as appropriate.

typedef struct {

union {

long intval;

double fltval;

char* string;

SoHObject* hObject;

} data;

long type;

long filler;

} TaggedData;

intval

Integer and boolean data values. Type is kTypeInteger, kTypeUInteger, or kTypeBool.

fltval

Floating-point numeric data values. Type is kTypeDouble.

string

String data values. All strings are UTF-8 encoded and null-terminated. Type is

kTypeString or kTypeScript.

X 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 When a function returns a string of type kTypeScript, ExtendScript evaluates the

script and returns the result of evaluation as the result of the function call.

hObject

A C/C++ representation of a JavaScript object data value. Type is kTypeLiveObject or

kTypeLiveObjectRelease.

X When a function returns an object of type kTypeLiveObject, ExtendScript does not

release the object.

X When a function returns an object of type kTypeLiveObjectRelease, ExtendScript

releases the object.

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EDOBE XDOM TAKE 6 IR - PRODUCTSHEET Spezifikationen Seite 214