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[Solved] Using a squirrel script as a callback inside a C++ class (Sqrat)
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thaumaturgist
#1 Posted : Sunday, January 08, 2012 3:07:59 PM(UTC)
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Sorry if this is a bit of a newb question.

The game engine I'm writing has an entity system, where a a new entity is created for each folder in a map folder. I have the directories set up like so:

Code:

maps
    map
    |    entity01
    |    |    entity.json
    |    |    init.nut
    |    |    update.nut
    |    |    destroy.nut



Each time an entity is created, the scripts in its folder are compiled, and they run at appropriate times. This all works fine.

The problem I'm having is that obviously the scripts aren't attached to an Squirrel instance of a class, so I can't call member functions. Is there a better way I could be handling this?
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thaumaturgist
#2 Posted : Tuesday, February 28, 2012 3:03:17 AM(UTC)
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Figured I would check back in and follow up on this... Activity here seems a bit low. :/

I've since abandoned this tactic in favor of deriving my entities from a base class written in C++, but this could still come in handy somewhere.

Code:


Sqrat::Script myScript(vm);

//    Load the entity script
try
{
    myScript.CompileFile("entity.nut");
}
catch (Sqrat::Exception& err)
{
    std::cout << "Loading script 'entity.nut' failed with error:" << std::endl;
    std::cout << err.Message() << std::endl;
}

//    Run the loaded script to register callbacks
try
{
    this->myScript.Run();
}
catch (Sqrat::Exception& err)
{
    std::cout << "Run script 'entity.nut' failed with error:" << std::endl;
    std::cout << err.Message() << std::endl;
}

//    Bind callbacks
Sqrat::Function myFunction = Sqrat::RootTable().GetFunction("init");


The script will be searched for a function named "init" and bind it to the C++ variable myFunction. You can then call it with parameters from C++.

Hopefully this helps somebody out.
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