To really store something:
Persistent<Value> MyVal = Persistent<Value>::New( Value::New() );
Replace Value with something like Array, for example. That will give you an
ever-existing value, not devoured by the GC. That, at least, works in my case
o.o;
Am Sa. Jan. 25 2014 19:07:14 schrieb mh:
> Hi.
>
> A cursory look at the code tells me you aren't quite aware of the existence
> of the "monster" called GC in v8. You can't just
> store the return value of a call for later use, there ain't any guarantee
> the monster won't devour it before you get to it :-).
> Search for the term Persistent in this group, and maybe you will find the
> answer. Hope it helps.
>
>
>
> On Friday, January 24, 2014 2:23:06 PM UTC-6, Pierre Saunier wrote:
> Hi,
>
> I want to use V8 as the scripting engine of my 3D modeler... but for the
> moment, I have some troubles...
>
> basicaly, I have a structre like this:
> typedef struct
> {
> v8::Isolate* isolate;
> v8::Handle<v8::ObjectTemplate> global;
> v8::Handle<v8::Context> context;
> v8::Handle<v8::Script> script;
> }v8ScriptEngineDef;
>
>
> a function to compile a script:
> int scriptCompile(char *fileName, char *code, v8ScriptEngineDef *v8Engine,
> scriptExternalFuncDef *externalFunc)
> {
>
> v8::HandleScope handle_scope(v8Engine->isolate);
> v8Engine->global = v8::ObjectTemplate::New();
> v8_create_file_obj(v8Engine->isolate, v8Engine->global);
> v8_create_color_obj(v8Engine->isolate, v8Engine->global);
> v8_create_image_obj(v8Engine->isolate, v8Engine->global);
> v8_create_gui_obj(v8Engine->isolate, v8Engine->global);
>
> v8Engine->global->Set(v8::String::NewFromUtf8(v8Engine->isolate, "console"),
> v8::FunctionTemplate::New(v8Engine->isolate,
> v8_console));
>
> v8Engine->context = v8::Context::New(v8Engine->isolate, NULL,
> v8Engine->global);
> if(v8Engine->context.IsEmpty()) {
> scriptEngineAddToConsole(v8Engine, "Error creating context\n");
> return FALSE;
> }
> v8Engine->context->Enter();
>
> v8::TryCatch try_catch;
> v8::Handle<v8::String> v8fileName =
> v8::String::NewFromUtf8(v8Engine->isolate,
> fileName);
> v8::Handle<v8::String> v8code = v8::String::NewFromUtf8(v8Engine->isolate,
> code);
> v8Engine->script = v8::Script::Compile(v8code, v8fileName);
> if(v8Engine->script.IsEmpty())
> {
> // Print errors that happened during compilation.
> ReportException(v8Engine, v8Engine->isolate, &try_catch);
> return false;
> }
> v8Engine->context->Exit();
> // scriptRun(engine);
>
>
> return TRUE;
> }
>
> and a running function:
> int scriptRun(v8ScriptEngineDef *v8Engine)
> {
> v8::HandleScope handle_scope(v8Engine->isolate);
> v8::TryCatch try_catch;
> v8Engine->context->Enter();
> v8::Handle<v8::Value> result = v8Engine->script->Run();
> if (result.IsEmpty())
> {
> assert(try_catch.HasCaught());
> // Print errors that happened during execution.
> ReportException(v8Engine, v8Engine->isolate, &try_catch);
> return false;
> }
> assert(!try_catch.HasCaught());
> if (!result->IsUndefined())
> {
> // If all went well and the result wasn't undefined then print
> // the returned value.
> v8::String::Utf8Value str(result);
> const char* cstr = *str;
> scriptEngineAddToConsole(v8Engine, (char *)cstr);
> }
> v8Engine->context->Exit();
> return true;
> }
>
> The problem is if I call the running function from the Compile function (in
> comment), everythink is working fine.
> But, If I call the compile fonction, then the run function... crash!!!
>
>
> Can somebody explain me what I am doing wrong?
>
>
> thanks,
>
> Pierre
>
> --
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