### Method

# Gio OutputStream writev_all_async

since: 2.60

#### Declaration

    void
    g_output_stream_writev_all_async (
      GOutputStream* stream,
      GOutputVector* vectors,
      gsize n_vectors,
      int io_priority,
      GCancellable* cancellable,
      GAsyncReadyCallback callback,
      gpointer user_data
    )

#### Description

Request an asynchronous write of the bytes contained in the `n_vectors` `vectors` into the stream. When the operation is finished `callback` will be called. You can then call `g_output_stream_writev_all_finish()` to get the result of the operation.

This is the asynchronous version of g_output_stream_writev_all().

Call `g_output_stream_writev_all_finish()` to collect the result.

Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is `G_PRIORITY_DEFAULT`.

Note that no copy of `vectors` will be made, so it must stay valid until `callback` is called. The content of the individual elements of `vectors` might be changed by this function.

Available since: 2.60

#### Parameters

`vectors`

  Type: An array of `GOutputVector`

  The buffer containing the `GOutputVectors` to write.

  The length of the array is specified in the `n_vectors` argument.
  The data is owned by the caller of the method.

`n_vectors`

  Type: `gsize`

  The number of vectors to write.

`io_priority`

  Type: `int`

  The I/O priority of the request.

`cancellable`

  Type: `GCancellable`

  Optional `GCancellable` object, `NULL` to ignore.

  The argument can be `NULL`.
  The data is owned by the caller of the method.

`callback`

  Type: `GAsyncReadyCallback`

  A `GAsyncReadyCallback` to call when the request is satisfied.

  The argument can be `NULL`.

`user_data`

  Type: `gpointer`

  The data to pass to callback function.

  The argument can be `NULL`.
  The data is owned by the caller of the method.