Question

Is it possible to return a struct from your native code? It’s relatively straight forward to return an int or a boolean but how do you return a more complex struct back to the actionscript?

Answer 1

You can return any object that can be represented in the native code as a FREObject. This actually includes any Actionscript class or Actionscript primitive data type. This includes things like: int, String, Array, BitmapData, ByteArray etc.

For example lets construct a return array of length 4 with the int values 0 – 3:

FREObject returnAnArray( FREContext cts, void* funcData, uint32_t argc, FREObject argv[])
{
    FREObject returnArray = NULL;
    FRENewObject((const uint8_t*)"Array", 0, NULL, &returnArray, nil );
    FRESetArrayLength( returnArray, 4 );

    for ( int32_t i = 0; i < 4; i++)
    {
        FREObject element;
        FRENewObjectFromUint32( i, element );
        FRESetArrayElementAt( returnArray, i, element );
    }
    return returnArray;
}

The method to construct Actionscript classes is a little more complex but follows a similar path. This is ofcourse a native C example, the Java equivalent is somewhat different but still it is possible to return complex objects from the native code.

For more information there is heaps of documentation here:

http://help.adobe.com/en_US/air/extensions/index.html