Hi, All,
There are two object involved:
Prototype
^
|
|
Object
I set interceptor on prototype template, and have set internal field on
Object.
Is there a way to access these internal field of Object in intercrptor of
Prototype?
For Accessor, there is a way to define signature, then the VM will pass the
right object to accessor, how about inteceptors?
Please check the following sample, it will crash if I try a access the
internal filed.
#include <v8.h>
#include <iostream>
#include <fstream>
#include <sstream>
#include <cmath>
using namespace v8;
v8::Handle<v8::Value> Getter(v8::Local<v8::String> propertyName,const
v8::AccessorInfo &info) {
v8::HandleScope handleScope;
v8::Handle<v8::External> external =
v8::Handle<v8::External>::Cast(info.Holder()->GetInternalField(0));
void * message = external->Value();
const char * str = (const char *)message;
printf(str);
//return something that is not NULL back
return v8::True();
}
Handle<Value> CreateObjectWithInteceptor(const Arguments& args)
{
HandleScope handleScope;
const char * test = "With Inteceptor";
v8::Handle<v8::External> external = v8::External::New((void *)test);
args.Holder()->SetInternalField(0, external);
return args.Holder();
}
int main()
{
HandleScope handleScope;
Handle<FunctionTemplate> functionTemplate =
FunctionTemplate::New(CreateObjectWithInteceptor);
functionTemplate->SetClassName(String::New("CreateObjectWithInteceptor"));
v8::Local<v8::Signature> default_signature =
v8::Signature::New(functionTemplate);
Handle<ObjectTemplate> instanceTemplate =
functionTemplate->InstanceTemplate();
instanceTemplate->SetInternalFieldCount(1); // create an internal field for
the C++ object
Handle<ObjectTemplate> prot = functionTemplate->PrototypeTemplate();
prot->SetNamedPropertyHandler(Getter);
Handle<ObjectTemplate> globals = ObjectTemplate::New();
globals->Set(String::New("object"), instanceTemplate); // add our print
function
Persistent<Context> context = Context::New(0, globals);
Context::Scope contextScope(context);
Handle<Script> script = Script::Compile(v8::String::New("object.getValue"));
Handle<Value> result = script->Run();
context.Dispose();
return 0;
}
Cheers~
Xiang
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