From what I understand, static function variables persists out of the scope of the function and are only allocated once in a specific memory area.
As this memory was allocated using a VALUE pointer unknown from Ruby, the Garbage Collector cleaned it up and I ended up with a Memory Access Violation.

So I would say, it is not a good idea to use a static variable of type VALUE, unless you find a way to tell Ruby GC by marking it.

I finally found my silly mistake using static keyword here, it was getting in the way of the GC.

%(#404080)[VALUE CRubyUtils::GetDAttribute(VALUE obj, VALUE att) { ~~static~~ VALUE getatt = rb_intern("get_attribute"); ~~static~~ VALUE dicatt = rb_str_new2("dynamic_attributes"); return rb_funcall(obj, getatt, 2, dicatt, att); }]

Thanks for your support, might see you at Basecamp.

I first typedefed VALUE and ID because of some include issues with ruby.h there. But it seems to be over now.

I changed the code to allocate the wrapped C++ class using rb_define_alloc_func but that didn't solved the issue.

I get the memory error whenever I call load_model a second time, and need to do before some cleaning in the Reset() method of dynamically allocated memory (EntityInfo) in the tree.

I'm trying to see if I can get some collision detection. I've only wrap one object to get access to the active_model. Visual Studio allows to go in debug mode, so I don't see any exception happening. I tried smart pointers but got back to regular pointers.

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Hello,

I've been playing with C/C++ extension starting from the Simple Extension example and I'm currently facing some challenges dealing with memory.
My goal is to build a tree in memory matching like the Outliner, and load the geometry to do some analysis.
I've built a class with a tree structure named "Coll" of pointer type "Entity", who has a std::vector of pointer of "Points". I always got a memory corruption error whenever I want to reload and delete some allocated memory.
What am I doing wrong ?

Olivier

Great, my goal is to make sure I'm dealing with a Entity in order to access its attributes.

Here is the code I've come up with.

VALUE result = rb_obj_is_kind_of(obj, rb_path2class("Sketchup;;Entity"));
if (Qtrue == result){
	VALUE rval = rb_funcall(obj, rb_intern("get_attribute"), 2, rb_str_new2("dynamic_attributes"), rb_str_new2("..."));
	...
}

I've been playing around with C Extension recently and I would like to know how if there is an equivalent of is_a? ruby function in C level.

I found rb_obj_is_instance_of but it seems to be only meant for native ruby types.

I looked over that SimpleExtension example, it seems very promising.

By the way, what exactly are the real benefit of using Ruby C Extension ? Does this have to do with performance ? As in SketchUp 2013, C++ SDK doesn't allow model interaction, it would be very interesting if we could improve the plugins efficiency with that possibility.

Olivier