# AudioHardwareServiceGetPropertyData(_:_:_:_:_:_:) Gets the value for a specified property. ``` func AudioHardwareServiceGetPropertyData(_ inObjectID: AudioObjectID, _ inAddress: UnsafePointer!, _ inQualifierDataSize: UInt32, _ inQualifierData: UnsafeRawPointer!, _ ioDataSize: UnsafeMutablePointer!, _ outData: UnsafeMutableRawPointer!) -> OSStatus ``` ## Parameters `inObjectID` The HAL audio object to query. `inAddress` The property whose value you want. `inQualifierDataSize` A `UInt32` value indicating the size of the buffer pointed to by the `inQualifierData` parameter. Not all properties require qualification; in such a case you set this parameter to `0`. `inQualifierData` A buffer of data to be used in determining the value of the property being queried. Not all properties require qualification; in such a case you set this parameter to `NULL`. `ioDataSize` On input, a `UInt32` value that indicates the size, in bytes, of the buffer pointed to by the `outData` parameter. On exit the size of the buffer that was used. `outData` The buffer into which the HAL audio object will put the property value. ## Return Value A result code. ## Discussion Some Core Audio property values are C types and others are Core Foundation objects. If you call this function to retrieve a value that is a Core Foundation object, then this function—despite the use of “Get” in its name—duplicates the object. You are responsible for releasing the object, as described in [The Create Rule](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/Concepts/Ownership.html#//apple_ref/doc/uid/20001148-103029) in [Memory Management Programming Guide for Core Foundation](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/CFMemoryMgmt.html#//apple_ref/doc/uid/10000127i). ## See Also [`AudioHardwareServiceGetPropertyDataSize(_:_:_:_:_:)`](/documentation/AudioToolbox/AudioHardwareServiceGetPropertyDataSize(_:_:_:_:_:)) Gets the payload size for a given property. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)