Registering a method which returns an array

IIRC, Angelscript arrays aren't binary compatible with C-style arrays. You'll have to register a class to handle it. std::vector will do the job fine.

Hi Deyja,
I also thought about registering my own array class. But since it is possible to send AS arrays to C functions via the asIScriptArray class wouldn't it be cool if I could also return asIScriptArray objects from my C functions.

So my users won't have to deal with two different types of arrays. The AS arrrays and my own registered Array class.

I think it wouldn't be to difficult to add that feature to AS. I think just the asIScriptArray class has to be extended slightly with a constructor and some "Set()" functions.

Would that be possible WitchLord.

Bye,
Martin

You should be able to create the asIScriptArray the following way:

int arrayTypeId = engine->GetTypeIdByDecl(0, "string[]");asIScriptArray *array = (asIScriptArray*)engine->CreateScriptObject(arrayTypeId);array->Resize(2);((asCScriptString*)array->GetElementPointer(0))->buffer = "String 1";((asCScriptString*)array->GetElementPointer(1))->buffer = "String 2";

The arrayTypeId can of course be cached.

I haven't tested the above code, so let me know if you're having problem getting it to work.

Regards,
Andreas

Hi,
yes it works. At least for a simple conversion of my vector class to a float array. Thanks for the tip. :)

Another question. Is there a difference if I use "float[] &array()" or "float[]@ array()". Both work.




Bye,
Martin

The difference is the memory management. :)

By returning a float[]& you're telling AngelScript that you're returning a reference to an object managed by the application, thus AngelScript shouldn't release the object.

By returning a float[]@ you're telling AngelScript that it is receiving a pointer with the reference accounted for. AngelScript will call Release() on this pointer when it is done with it.

If you're using CreateScriptObject() to create a new array for each call then you should use float[]@, since you are not keeping the reference for later use.

Hi,
thanks for the help. It works like a charm. Now I've also tested it with my string class and it worked to.

But for the some reasons the strings in my array didn't get released. But that could be my fault too. I have to check that first.

Bye,
Martin