Get the value of a configuration option asynchronously.
See also: get_value.
| this |
An Config |
| section |
Section name of the configuration option. |
| name |
Name of the configure option. |
| timeout_ms |
The timeout in milliseconds or -1 to use the default timeout. |
| cancellable |
A Cancellable or null. |
| callback |
Callback function to invoke when the return value is ready. |
| user_data |
The data to pass to callback. |