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Name	Size	Permission
asyncworker.md	5.22 KB	-rw-r--r--
buffers.md	2.07 KB	-rw-r--r--
callback.md	2.57 KB	-rw-r--r--
converters.md	1.9 KB	-rw-r--r--
errors.md	7.23 KB	-rw-r--r--
json.md	1.9 KB	-rw-r--r--
maybe_types.md	21.88 KB	-rw-r--r--
methods.md	26.61 KB	-rw-r--r--
new.md	4.75 KB	-rw-r--r--
node_misc.md	5.57 KB	-rw-r--r--
object_wrappers.md	8.03 KB	-rw-r--r--
persistent.md	10.63 KB	-rw-r--r--
scopes.md	2.31 KB	-rw-r--r--
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string_bytes.md	1.86 KB	-rw-r--r--
v8_internals.md	7.21 KB	-rw-r--r--
v8_misc.md	2.85 KB	-rw-r--r--

Code Editor : buffers.md

## Buffers

NAN's `node::Buffer` helpers exist as the API has changed across supported Node versions. Use these methods to ensure compatibility.

- <a href="#api_nan_new_buffer"><code>Nan::NewBuffer()</code></a>
 - <a href="#api_nan_copy_buffer"><code>Nan::CopyBuffer()</code></a>
 - <a href="#api_nan_free_callback"><code>Nan::FreeCallback()</code></a>

<a name="api_nan_new_buffer"></a>
### Nan::NewBuffer()

Allocate a new `node::Buffer` object with the specified size and optional data. Calls `node::Buffer::New()`.

Note that when creating a `Buffer` using `Nan::NewBuffer()` and an existing `char*`, it is assumed that the ownership of the pointer is being transferred to the new `Buffer` for management.
When a `node::Buffer` instance is garbage collected and a `FreeCallback` has not been specified, `data` will be disposed of via a call to `free()`.
You _must not_ free the memory space manually once you have created a `Buffer` in this way.

Signature:

```c++
Nan::MaybeLocal<v8::Object> Nan::NewBuffer(uint32_t size)
Nan::MaybeLocal<v8::Object> Nan::NewBuffer(char* data, uint32_t size)
Nan::MaybeLocal<v8::Object> Nan::NewBuffer(char *data,
 size_t length,
 Nan::FreeCallback callback,
 void *hint)
```

<a name="api_nan_copy_buffer"></a>
### Nan::CopyBuffer()

Similar to [`Nan::NewBuffer()`](#api_nan_new_buffer) except that an implicit memcpy will occur within Node. Calls `node::Buffer::Copy()`.

Management of the `char*` is left to the user, you should manually free the memory space if necessary as the new `Buffer` will have its own copy.

Signature:

```c++
Nan::MaybeLocal<v8::Object> Nan::CopyBuffer(const char *data, uint32_t size)
```

<a name="api_nan_free_callback"></a>
### Nan::FreeCallback()

A free callback that can be provided to [`Nan::NewBuffer()`](#api_nan_new_buffer).
The supplied callback will be invoked when the `Buffer` undergoes garbage collection.

Signature:

```c++
typedef void (*FreeCallback)(char *data, void *hint);
```

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Code Editor : buffers.md