Hi,
I am writing a C++ module for node. I have a JS callback registered which
will receive regular callbacks with binary data (audio data).
My C++ to call the callback looks a bit like:
UniquePersistent<v8::Function> dataCallback = // from somewhere...
HandleScope scope(isolate);
const unsigned argc = 1;
auto buffer = node::Buffer::New(dataSize);
std::memcpy(node::Buffer::Data(buffer), data.get(), dataSize);
Local<Value> argv[argc] = { buffer };
auto fn = Local<Function>::New(isolate, dataCallback);
auto context = isolate->GetCurrentContext();
auto global = context->Global();
fn->Call(global, argc, argv);
At the moment my callback is simply passing the buffer on to
fs.writeFile(...):
var fs = require('fs');
mymodule.dosomething(function(data) {
fs.writeFile('raw_data', data, { flag: 'a' })
});
This appears to work, however the lifetime of the buffer object is suspect.
This seems unsafe, as my understanding is that the Local<Buffer> is going
to be cleared up when the HandleScope is destroyed after the callback has
returned. Unfortunately, fs.writeFile() is probably still busy with the
buffer.
The key would seem to be something to do with Persistent<> and
UniquePersistent<> but I don't quite grok it.
Any tips, or pointers to examples would be great...
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