OutputStream.spliceAsync

void spliceAsync(gio.input_stream.InputStream source,  gio.types.OutputStreamSpliceFlags flags,  int  ioPriority,  gio.cancellable.Cancellable cancellable =  null,  gio.types.AsyncReadyCallback callback =  null)

Splices a stream asynchronously. When the operation is finished callback will be called. You can then call gio.output_stream.OutputStream.spliceFinish to get the result of the operation.

For the synchronous, blocking version of this function, see gio.output_stream.OutputStream.splice.

Parameters

`source`	a #GInputStream.
`flags`	a set of #GOutputStreamSpliceFlags.
`ioPriority`	the io priority of the request.
`cancellable`	optional #GCancellable object, null to ignore.
`callback`	a #GAsyncReadyCallback to call when the request is satisfied