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array_buffer.md

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ArrayBuffer

Class Napi::ArrayBuffer inherits from class Napi::Object.

The Napi::ArrayBuffer class corresponds to the JavaScript ArrayBuffer class.

Methods

New

Allocates a new Napi::ArrayBuffer instance with a given length.

static Napi::ArrayBuffer Napi::ArrayBuffer::New(napi_env env, size_t byteLength);
  • [in] env: The environment in which to create the Napi::ArrayBuffer instance.
  • [in] byteLength: The length to be allocated, in bytes.

Returns a new Napi::ArrayBuffer instance.

New

When NODE_API_NO_EXTERNAL_BUFFERS_ALLOWED is defined, this method is not available. See External Buffer for more information.

Wraps the provided external data into a new Napi::ArrayBuffer instance.

The Napi::ArrayBuffer instance does not assume ownership for the data and expects it to be valid for the lifetime of the instance. Since the Napi::ArrayBuffer is subject to garbage collection this overload is only suitable for data which is static and never needs to be freed. This factory method will not provide the caller with an opportunity to free the data when the Napi::ArrayBuffer gets garbage-collected. If you need to free the data retained by the Napi::ArrayBuffer object please use other variants of the Napi::ArrayBuffer::New factory method that accept Napi::Finalizer, which is a function that will be invoked when the Napi::ArrayBuffer object has been destroyed.

static Napi::ArrayBuffer Napi::ArrayBuffer::New(napi_env env, void* externalData, size_t byteLength);
  • [in] env: The environment in which to create the Napi::ArrayBuffer instance.
  • [in] externalData: The pointer to the external data to wrap.
  • [in] byteLength: The length of the externalData, in bytes.

Returns a new Napi::ArrayBuffer instance.

New

When NODE_API_NO_EXTERNAL_BUFFERS_ALLOWED is defined, this method is not available. See External Buffer for more information.

Wraps the provided external data into a new Napi::ArrayBuffer instance.

The Napi::ArrayBuffer instance does not assume ownership for the data and expects it to be valid for the lifetime of the instance. The data can only be freed once the finalizeCallback is invoked to indicate that the Napi::ArrayBuffer has been released.

template <typename Finalizer>
static Napi::ArrayBuffer Napi::ArrayBuffer::New(napi_env env,
                       void* externalData,
                       size_t byteLength,
                       Finalizer finalizeCallback);
  • [in] env: The environment in which to create the Napi::ArrayBuffer instance.
  • [in] externalData: The pointer to the external data to wrap.
  • [in] byteLength: The length of the externalData, in bytes.
  • [in] finalizeCallback: A function to be called when the Napi::ArrayBuffer is destroyed. It must implement operator(), accept an Napi::Env, a void* (which is the externalData pointer), and return void.

Returns a new Napi::ArrayBuffer instance.

New

When NODE_API_NO_EXTERNAL_BUFFERS_ALLOWED is defined, this method is not available. See External Buffer for more information.

Wraps the provided external data into a new Napi::ArrayBuffer instance.

The Napi::ArrayBuffer instance does not assume ownership for the data and expects it to be valid for the lifetime of the instance. The data can only be freed once the finalizeCallback is invoked to indicate that the Napi::ArrayBuffer has been released.

template <typename Finalizer, typename Hint>
static Napi::ArrayBuffer Napi::ArrayBuffer::New(napi_env env,
                       void* externalData,
                       size_t byteLength,
                       Finalizer finalizeCallback,
                       Hint* finalizeHint);
  • [in] env: The environment in which to create the Napi::ArrayBuffer instance.
  • [in] externalData: The pointer to the external data to wrap.
  • [in] byteLength: The length of the externalData, in bytes.
  • [in] finalizeCallback: The function to be called when the Napi::ArrayBuffer is destroyed. It must implement operator(), accept an Napi::Env, a void* (which is the externalData pointer) and Hint*, and return void.
  • [in] finalizeHint: The hint to be passed as the second parameter of the finalize callback.

Returns a new Napi::ArrayBuffer instance.

Constructor

Initializes an empty instance of the Napi::ArrayBuffer class.

Napi::ArrayBuffer::ArrayBuffer();

Constructor

Initializes a wrapper instance of an existing Napi::ArrayBuffer object.

Napi::ArrayBuffer::ArrayBuffer(napi_env env, napi_value value);
  • [in] env: The environment in which to create the Napi::ArrayBuffer instance.
  • [in] value: The Napi::ArrayBuffer reference to wrap.

ByteLength

size_t Napi::ArrayBuffer::ByteLength() const;

Returns the length of the wrapped data, in bytes.

Data

void* Napi::ArrayBuffer::Data() const;

Returns a pointer the wrapped data.

Detach

void Napi::ArrayBuffer::Detach();

Invokes the ArrayBuffer detach operation on a detachable ArrayBuffer.

IsDetached

bool Napi::ArrayBuffer::IsDetached() const;

Returns true if this ArrayBuffer has been detached.