CallbackInfo

The object representing the components of the JavaScript request being made.

The Napi::CallbackInfo object is usually created and passed by the Node.js runtime or node-addon-api infrastructure.

The Napi::CallbackInfo object contains the arguments passed by the caller. The number of arguments is returned by the Length method. Each individual argument can be accessed using the operator[] method.

The SetData and Data methods are used to set and retrieve the data pointer contained in the Napi::CallbackInfo object.

Methods

Constructor

cpp Napi::CallbackInfo::CallbackInfo(napi_env env, napi_callback_info info);

• [in] env: The napi_env environment in which to construct the Napi::CallbackInfo object.
• [in] info: The napi_callback_info data structure from which to construct the Napi::CallbackInfo object.

Env

cpp Napi::Env Napi::CallbackInfo::Env() const;

Returns the Env object in which the request is being made.

NewTarget

cpp Napi::Value Napi::CallbackInfo::NewTarget() const;

Returns the new.target value of the constructor call. If the function that was invoked (and for which the Napi::NCallbackInfo was passed) is not a constructor call, a call to IsEmpty() on the returned value returns true.

IsConstructCall

cpp bool Napi::CallbackInfo::IsConstructCall() const;

Returns a bool indicating if the function that was invoked (and for which the Napi::CallbackInfo was passed) is a constructor call.

Length

cpp size_t Napi::CallbackInfo::Length() const;

Returns the number of arguments passed in the Napi::CallbackInfo object.

operator []

cpp const Napi::Value operator [](size_t index) const;

• [in] index: The zero-based index of the requested argument.

Returns a Napi::Value object containing the requested argument.

This

cpp Napi::Value Napi::CallbackInfo::This() const;

Returns the JavaScript this value for the call

Data

cpp void* Napi::CallbackInfo::Data() const;

Returns the data pointer for the callback.

SetData

cpp void Napi::CallbackInfo::SetData(void* data);

• [in] data: The new data pointer to associate with this Napi::CallbackInfo object.

Returns void.

Not documented here

cpp Napi::CallbackInfo::~CallbackInfo(); // Disallow copying to prevent multiple free of _dynamicArgs Napi::CallbackInfo::CallbackInfo(CallbackInfo const &) = delete; void Napi::CallbackInfo::operator=(CallbackInfo const &) = delete;