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# AudioServerPlugInCustomPropertyDataType

The set of data types the Host knows how to marshal between the server and the client.

```
typedef UInt32 AudioServerPlugInCustomPropertyDataType;
```

## Discussion

These are the only types supported for custom properties. See [`AudioServerPlugInCustomPropertyInfo`](/documentation/CoreAudio/AudioServerPlugInCustomPropertyInfo) for more information.

- `kAudioServerPlugInCustomPropertyDataTypeNone`: This is used to declare that the property doesn’t have any property or qualifier data.
- `kAudioServerPlugInCustomPropertyDataTypeCFString`: The property/qualifier data is a CFStringRef.
- `kAudioServerPlugInCustomPropertyDataTypeCFPropertyList`: The property/qualifier data is a CFPropertyListRef.

---

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