Asynchronously queries the this for a FileInfo.
When completed, callback will be called with a AsyncResult which can
be used to finish the operation with query_info_async.end.
For the synchronous version of this function, see query_info.
| this |
a FileIOStream. |
| attributes |
a file attribute query string. |
| io_priority |
the I/O priority of the request |
| cancellable |
optional Cancellable object, null to ignore. |
| callback |
callback to call when the request is satisfied |
| user_data |
the data to pass to callback function |