Opens a Network Diagnostics window.
- iOS 2.0–11.0Deprecated
- macOS 10.4–10.13Deprecated
- Mac Catalyst 13.0–13.0Deprecated
- tvOS 9.0–11.0Deprecated
CFNet if no error occurred, or
CFNet if an error occurred that prevented this call from completing successfully.
This function opens the Network Diagnostics window and returns immediately once the window is open.
This function is thread safe as long as another thread does not alter the same CFNetDiagnosticRef at the same time.