Array function in one context is different from Array function in
another context as each context is a separate world with it's own
built-in objects.
You can use Array.isArray which should work cross-context.
--
Vyacheslav Egorov
On Mon, Jun 25, 2012 at 9:08 PM, MikeM <mi...@reteksolutions.com> wrote:
> The code below throws an exception because the saved property "arraytest" is
> doesn't seem to be an array on the second execution of script.
> I presume the build-ins prototypes like "Array" must be different after
> Reattaching the same global to the 2nd context.
> But why?
> The failure happens in the final test at the end of the code.
>
> ------------------------------------------------
> static inline v8::Local<v8::Value> CompileRun(const char* source) {
> return v8::Script::Compile(v8::String::New(source))->Run();
> }
>
> HandleScope scope;
> Persistent<Context> ctxRequest = Context::New();
>
> Local<Value> foo = String::New("foo");
> ctxRequest->SetSecurityToken(foo);
> ctxRequest->Enter(); //Start execution of 1st request.
>
> //Create an object we can use to store properties between requests.
> Persistent<Object> sessionObject = Persistent<Object>::New(Object::New());
> Local<Object> requestGlobal = ctxRequest->Global();
>
> //Create a reference to session object on request global.
> requestGlobal->Set(String::New("Session"), sessionObject);
> TryCatch trycatch;
>
> //Add property to the session object and save it. Add an empty array too.
> CompileRun("Session.saveme = 42; if(Session.arraytest === undefined)
> {Session.arraytest = [];}");
>
> //Makes sure we have an array and return value in saveme
> Local<Value> result = Script::Compile(String::New("if(!(Session.arraytest
> instanceof Array)) {throw new Error('Failed instanceof Array test.');}
> Session.saveme"))->Run();
> if(result.IsEmpty())
> {
> Handle<Value> exception = trycatch.Exception();
> String::AsciiValue exception_str(exception);
> printf("Exception: %s\n", *exception_str);
> }
> else
> {
> CHECK(!result->IsUndefined());
> CHECK(result->IsInt32());
> CHECK(42 == result->Int32Value());
> }
>
> //Save the the global and reattach to 2nd request later
> Persistent<Object> requestSavedGlobal =
> Persistent<Object>::Persistent(ctxRequest->Global());
> ctxRequest->DetachGlobal();
> ctxRequest->Exit();
>
> Persistent<Context> ctxRequest2 = Context::New();
> ctxRequest2->ReattachGlobal(requestSavedGlobal);
> ctxRequest2->SetSecurityToken(foo);
> ctxRequest2->Enter();
>
> requestSavedGlobal->Set(String::New("Session"), sessionObject);
>
> //Check that we can get value of saved property in the session.
> result = Script::Compile(String::New("if(!(Session.arraytest instanceof
> Array)) {throw new Error('Failed instanceof Array test.');}"))->Run();
> if(result.IsEmpty())
> {
> Handle<Value> exception = trycatch.Exception();
> String::AsciiValue exception_str(exception);
> printf("Exception: %s\n", *exception_str);
> }
>
> --
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