Sets the 64-bit user-specified data for a Quartz event source.
- macOS 10.4+
- Mac Catalyst 13.0+
- Core Graphics
The event source to access.
The user-specified data. For example, you could specify a vendor hardware ID.
Each input event includes 64 bits of user-specified data. This function sets the user-specified data for all events created by the specified event source. This data may also be set per event using the