Creating custom JavaScript functions in V8?

Question

I'm trying to embed an custom function to my project, that uses the V8 engine, and apparently I can't make it working. I've used code, that I've found, but it seems to be outdated, or I just do it wrong. My point is to include a custom javascript file. My current code (for testing) is this :

    HandleScope handle_scope(isolate);

    v8::Local<v8::ObjectTemplate> global = v8::ObjectTemplate::New(isolate);
    global->Set(v8::String::NewFromUtf8(isolate, "test", v8::NewStringType::kNormal).ToLocalChecked(),
        v8::FunctionTemplate::New(isolate, test));

    Handle<Context> context = Context::New(isolate);
    Persistent<Context> persistent_context(isolate, context);

    Context::Scope context_scope(context);
    const char* data = "test";
    Handle<String> source = String::NewFromUtf8(isolate, data);

    Handle<Script> script = Script::Compile(source);
    if (!script.IsEmpty())
        Handle<Value> result = script->Run();

Test Code (obviously just for testing):

void test(const v8::FunctionCallbackInfo<v8::Value>& args) {
    MessageBoxA(NULL,"test", "", 0);
}

But the engine returns this error :

Uncaught ReferenceError: test is not defined

So my question is if I even do it correct, I would be able to make the including myself I hope, but I just can't get the function to get executed.

michaeltheory · Accepted Answer · 2017-11-12 03:22:26Z

2

Here's some code from a project that works:

Isolate::Scope iscope( isolate_ );
HandleScope hs( isolate_ );


Local<Object> test = Object::New(isolate_);
test->Set(String::NewFromUtf8(isolate_, "javaScriptFunctionName"), Function::New(isolate_, CPP_FN_CALLBACK));
global_template->Set(String::NewFromUtf8(isolate_, "test"), test);

That will result in an object for window.test with a function called window.test.javaScriptFunctionName()

answered Nov 12, 2017 at 3:22

michaeltheory

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2 Comments

J-Cake Over a year ago

Can you elaborate on CPP_FN_CALLBACK please? Is it a standard function like you see in the addon's entry point?

michaeltheory Over a year ago

@JacobSchneider Yes, exactly. Just a standard cpp function that takes int v8 args as a parameter

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