Reads the partial contents of a file.
A FileReadMoreCallback should be used to stop reading from the file when appropriate, else this function will behave exactly as load_contents_async . This operation can be finished by load_partial_contents_async.end.
Users of this function should be aware that user_data is passed to both the read_more_callback and the
callback.
If cancellable is not null, then the operation can be cancelled by triggering the
cancellable object from another thread. If the operation was cancelled, the error g_io_error_cancelled
will be returned.
| this |
input File |
| cancellable |
optional Cancellable object, null to ignore |
| read_more_callback |
a FileReadMoreCallback to receive partial data and to specify whether further data should be read |
| callback |
a TaskReadyCallback to call when the request is satisfied |
| user_data |
the data to pass to the callback functions |