V8 Callback, with Number instead of String

Question

Passing an argument from Node.js to the C++ function, and returning the result to Node.js via a callback function.

Following the Node.js Addons Callback example, the example has been modified to involve a Number instead of a String.

Here's the example codeset from the Node.js Addons:

Local<Function> cb = Local<Function>::Cast(args[0]);
const unsigned argc = 1;
Local<Value> argv[argc] = { String::NewFromUtf8(isolate, "hello world") };
cb->Call(isolate->GetCurrentContext()->Global(), argc, argv);

And here's the modified codeset, where value is a Number from a position in an Array:

Local<Function> cb = Local<Function>::Cast(args[1]);
const unsigned argc = 2;
Local<Value> argv[argc] = {Number::New(isolate, value)};
cb->Call(isolate->GetCurrentContext()->Global(), argc, argv);

where is the segfault happening?

Amit
– Amit

2015-07-20 06:34:06 +00:00
Commented Jul 20, 2015 at 6:34 — Amit
– Amit, Commented Jul 20, 2015 at 6:34

Amit · Accepted Answer · 2015-07-20 06:39:03Z

2

Your problem is that you define an array of size 2 for your arguments, you call the callback function passing arg count as 2 as well, but your initialize your array to a single value. Either change argc = 1, or initialize 2 values in the argv array.

answered Jul 20, 2015 at 6:39

Amit

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