---
UID: NS:bthledef._BLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION
title: BLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION (bthledef.h)
description: The BLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION structure describes one or more characteristics that have changed.
old-location: bltooth\bluetooth_gatt_value_changed_event_registration.htm
tech.root: bltooth
ms.assetid: 97EB32A7-87BF-4DBA-9480-4BB7DFCBFB23
ms.date: 12/05/2018
ms.keywords: '*PBLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION, BLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION, BLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION structure [Bluetooth Devices], PBLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION, PBLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION structure pointer [Bluetooth Devices], bltooth.bluetooth_gatt_value_changed_event_registration, bthledef/BLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION, bthledef/PBLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION'
f1_keywords:
- bthledef/BLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION
dev_langs:
- c++
req.header: bthledef.h
req.include-header: BthLEDef.h
req.target-type: Windows
req.target-min-winverclnt: Versions:\_Supported in Windows 8
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topic_type:
- APIRef
- kbSyntax
api_type:
- HeaderDef
api_location:
- BthLEDef.h
api_name:
- BLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION
targetos: Windows
req.typenames: BLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION, *PBLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION
req.redist: 
ms.custom: 19H1
---

# BLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION structure


## -description


The BLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION structure describes one or more characteristics that have changed.


## -struct-fields




### -field NumCharacteristics

The number of characteristics that follow this member in memory.


### -field Characteristics

 




#### - Characteristics[1]

Array of characteristics to monitor for incoming events.


## -see-also




<a href="https://docs.microsoft.com/windows/desktop/api/bthledef/ns-bthledef-bth_le_gatt_characteristic">BTH_LE_GATT_CHARACTERISTIC</a>
 

 

