How do I get internal data for function callbacks? The approach I'm
currently taking is to use the function's prototype object where I can
declare an internal field and then set it at context time. However,
I get an error about the internal field count when I retrieve the
prototype and try to set data (code and error shown below).
I'm also not sure about how to unpack the data in the handler.
erik
v8::Handle<v8::Value> myHandler(const v8::Arguments& args) {
nd::unused(args);
using namespace v8;
return Undefined();
}
using namespace v8;
HandleScope handle_scope;
v8::Persistent<v8::ObjectTemplate> global_template =
Persistent<ObjectTemplate>::New(ObjectTemplate::New());
Handle<FunctionTemplate> tmpl = FunctionTemplate::New(myHandler);
Handle<ObjectTemplate> proto_t = tmpl->PrototypeTemplate();
proto_t->SetInternalFieldCount(1);
global_template->Set(String::New("myFunction"),tmpl);
Persistent<Context> context = Context::New(0, global_template);
Context::Scope context_scope(context);
Handle<Function> fn = tmpl->GetFunction();
Handle<Object> proto = Handle<Object>::Cast(fn->GetPrototype());
void *data(0);
proto->SetInternalField(0, External::New(data));
#
# Fatal error in v8::Object::SetInternalField()
# Writing internal field out of bounds
#
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