---
title: HandleChangeCustomPropertyDataValueWithQualifier
framework: audiodriverkit
role: symbol
role_heading: Instance Method
path: audiodriverkit/iouseraudiocustomproperty/handlechangecustompropertydatavaluewithqualifier
---

# HandleChangeCustomPropertyDataValueWithQualifier

Tells the property the data value is changing.

## Declaration

```occ
virtual kern_return_t HandleChangeCustomPropertyDataValueWithQualifier(OSObject *in_qualifier_data, OSObject *in_data);
```

## Parameters

- `in_qualifier_data`: The qualifier data doc://com.apple.documentation/documentation/DriverKit/OSObject associated with setting the property data value. This can be an doc://com.apple.documentation/documentation/DriverKit/OSString, doc://com.apple.documentation/documentation/DriverKit/OSDictionary, or NULL.
- `in_data`: An doc://com.apple.documentation/documentation/DriverKit/OSObject to set as the custom property value.

## Return Value

Return Value kIOReturnSuccess on success, or another value if an error occurs. For a list of error codes, see Error Codes.

## Discussion

Discussion The default implementation sets the value and returns kIOReturnSuccess, without checking the qualifier data. Subclass and override this method to handle changes to the custom property and return kIOReturnSuccess upon success.