Gck.Object.prototype.get_data_async

function get_data_async(attr_type: Number(gulong), allocator: Gck.Allocator, cancellable: Gio.Cancellable, callback: Gio.AsyncReadyCallback): void {
    // Gjs wrapper for gck_object_get_data_async()
}

Get the data for the specified attribute from the object.

This call will return immediately and complete asynchronously.

attr_type: The attribute to get data for.
allocator: An allocator with which to allocate memory for the data, or NULL for default.
cancellable: Optional cancellation object, or NULL.
callback: Called when the operation completes.