[ Version ( deprecated = true , deprecated_since = "3.8" , since = "3.2" ) ]
public virtual async bool retrieve_capabilities (Cancellable? cancellable, out string capabilities) throws Error
Warning: retrieve_capabilities is deprecated since 3.8.
Initiates retrieval of capabilities on the this.
Use get_capabilities instead.
This is usually required only once, after the this is opened. The returned value is cached and any
subsequent call of get_capabilities and
check_capability is using the cached value. The call is finished by
retrieve_capabilities.end from the callback.
| this |
an Client |
| cancellable |
a Cancellable; can be |
| callback |
callback to call when a result is ready |
| user_data |
user data for the |