contentSerializeAsync

void contentSerializeAsync(gio.output_stream.OutputStream stream,  string mimeType,  gobject.value.Value value,  int  ioPriority,  gio.cancellable.Cancellable cancellable =  null,  gio.types.AsyncReadyCallback callback =  null)

Serialize content and write it to the given output stream, asynchronously.

The default I/O priority is [glib.types.PRIORITY_DEFAULT] (i.e. 0), and lower numbers indicate a higher priority.

When the operation is finished, callback will be called. You must then call funcGdk.content_serialize_finish to get the result of the operation.

Parameters

`stream`	a [gio.output_stream.OutputStream] to write the serialized content to
`mimeType`	the mime type to serialize to
`value`	the content to serialize
`ioPriority`	the I/O priority of the operation
`cancellable`	optional [gio.cancellable.Cancellable] object
`callback`	callback to call when the operation is done