Pass Node.js Buffer to C++ addon

Question

test.js

buf = new Buffer(100);
for (var i = 0; i < 100; i++) buf[i] = i
addon.myFync(buf);

addon.cpp

Handle<Value> set(const Arguments& args) {
    char *buf = SOMETHING(args[0]);
    return Undefined();
}

How to get the pointer to a data of the buffer inside the C++ function?

What should I write in place of SOMETHING(args[0])?

I have node_buffer.h opened in my editor, but I cannot figure out.

Node version = v0.10.29

Answer 1

You can do:

char* buf = node::Buffer::Data(args[0]);

to directly access the bytes of a Buffer.

Answer 2

According to the node.js node binding documentation the 'arg[0]' value argument can be accessed as:

String::AsciiValue v(args[0]->ToString());