I'm working on a project which has settings for each display. I want my application to support a display being removed and later re-added, possibly with another display used in between, with the original settings for each display being applied when the display is seen again.
As far as I can tell there is no way, through NSScreen, to uniquely identify one outside of the context of the current display configuration. I can't just use screen dimensions/properties as the user could have multiple displays of the same model in different locations; this problem applies to all persistent properties of a screen as far as I can tell.
Is there a good, known way to do this?
Thanks for your time. Any help is greatly appreciated.
The documentation to -[NSScreen deviceDescription] talks about getting the CGDirectDisplayID and the documentation about the CGDirectDisplayID says:
When a monitor is attached, Quartz assigns a unique display identifier (ID). A display ID can persist across processes and system reboot, and typically remains constant as long as certain display parameters do not change.
When assigning a display ID, Quartz considers the following parameters:
- Vendor
- Model
- Serial number
- Position in the I/O Kit registry
This sounds pretty close to what you are looking for.