Serialize content and write it to the given output stream, asynchronously.
The default I/O priority is g_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 [[email protected]_serialize_finish] to get the
result of the operation.
| stream |
a `GOutputStream` to write the serialized content to |
| mime_type |
the mime type to serialize to |
| value |
the content to serialize |
| io_priority |
the I/O priority of the operation |
| cancellable |
optional `GCancellable` object |
| callback |
callback to call when the operation is done |
| user_data |
data to pass to the callback function |