This would be pretty easy to do with nbind
<https://github.com/charto/nbind#readme> if you first call some C++
function with pointers to all JavaScript the functions you need to call.
Note that the following code currently only works when compiled with
Emscripten.
Your C++ code could for example have a main init function that gets called
from JavaScript and after that, you can have most of the action happen in
C++ if you want. In this example, init receives one JavaScript function it
can then call at any time. init also instantiates a C++ object and passes
that to the JavaScript function.
#include <string>
#include <iostream>
#include "nbind/nbind.h"
struct Foobar {
void frob(std::string data) {
std::cout << data << "\n";
}
};
void init(nbind::cbFunction &jsFunction) {
Foobar *foo = new Foobar();
jsFunction(foo);
}
#include "nbind/nbind.h"
NBIND_CLASS(Foobar) {
method(frob);
}
NBIND_GLOBAL() {
function(init);
}
Now let's see the JavaScript side, which calls the C++ init function and
can give it pointers to JavaScript functions. The example function here
takes a C++ object, and calls the frob method after some delay, passing it
a string.
var nbind = require('nbind');
var lib = nbind.init().lib;
function something(foo) {
setTimeout(function() { foo.frob('Hello, World!'); }, 1000);
}
lib.init(something);
Hopefully this would fit your needs. The same code should also work in a
future 0.3 version of nbind when compiled using GCC, Clang or Visual Studio
2015 into a native Node.js addon. Currently however passing pointers to
objects constructed in C++ to JavaScript is only supported when compiling
with Emscripten.
tiistai 21. kesäkuuta 2016 20.00.14 UTC-5 PSN kirjoitti:
>
> I would like to instantiate an object in C++ and have a Javascript onload
> function callback to one of the instantiated objects methods. The plan
> would be to call the Javascript code from C++ and then have the Javascript
> callback to the object function. What is the best way to do this? I've been
> looking at EMBind, but I don't want to instantiate in Javascript. Thanks!
>
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