Node -webkit crashes when I create an ArrayBuffer inside C ++ add-on

Question

I am writing a node -webkit C ++ add-in, it crashes every time I try to create an ArrayBuffer. The following code is a minimal example of a failure.

#include <node.h>
#include <v8.h>
#include <cstring>

using namespace v8;

Handle<Value> createVector(const Arguments& args) {
  HandleScope scope;
  Handle<ArrayBuffer> a = ArrayBuffer::New(12);
  return scope.Close(a);
}

void init(Handle<Object> exports) {
  exports->Set(String::NewSymbol("createVector"),
      FunctionTemplate::New(createVector)->GetFunction());
}

NODE_MODULE(vectortest, init)

Every time I call the createVector () method of node -webkit, Windows 8 crashes. I call it from the console using the following javascript code:

var m=require('vectortest');
m.createVector();

I tried this on node -webkit 0.7.2 and 0.7.5. Any suggestion?

Answer 1

So, I solved my problem using the workaround below.

Handle<Object> createBuffer(void *data, size_t size) {
    if (size == 0)
        throw "Zero sized data";
    Handle<Value> abv = Context::GetCurrent()->Global()->Get(String::NewSymbol("ArrayBuffer"));
    Handle<Value> argv[] = { Integer::NewFromUnsigned(size) };
    Handle<Object> arrbuf = Handle<Function>::Cast(abv)->NewInstance(1, argv);
    void *buffer = arrbuf->GetPointerFromInternalField(0);
    memcpy(buffer, data, size);

    Handle<Value> ui8av = Context::GetCurrent()->Global()->Get(String::NewSymbol("Uint8Array"));
    argv[0] = arrbuf;
    Handle<Object> result = Handle<Function>::Cast(ui8av)->NewInstance(1, argv);
    return result;
}

, v8.
, node , , node -webkit, ArrayBuffer, TypedArray, Uint8Array .. node/src/v8_typed_array.cc. , v8.h, .
javascript- - :

var buffer = ... // call function that in the end call createBuffer
var data = new Uint8Array(buffer);

createBuffer arrbuf ArrayBuffer, : 0. , Uint8Array ++, , .