Node.js N-API 对象封装

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Node.js N-API 对象封装

N-API offers a way to “wrap” C++ classes and instances so that the class constructor and methods can be called from JavaScript.

The napi_define_class API defines a JavaScript class with constructor, static properties and methods, and instance properties and methods that correspond to the C++ class. When JavaScript code invokes the constructor, the constructor callback uses napi_wrap to wrap a new C++ instance in a JavaScript object, then returns the wrapper object. When JavaScript code invokes a method or property accessor on the class, the corresponding napi_callback C++ function is invoked. For an instance callback, napi_unwrap obtains the C++ instance that is the target of the call. For wrapped objects it may be difficult to distinguish between a function called on a class prototype and a function called on an instance of a class. A common pattern used to address this problem is to save a persistent reference to the class constructor for later instanceof checks.

napi_value MyClass_constructor = NULL; status = napi_get_reference_value(env, MyClass::es_constructor, &MyClass_constructor); assert(napi_ok == status); bool is_instance = false; status = napi_instanceof(env, es_this, MyClass_constructor, &is_instance); assert(napi_ok == status); if (is_instance) { // napi_unwrap() … } else { // otherwise… } The reference must be freed once it is no longer needed.


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