GattCharacteristic.ReadValueAsync 方法

定义

命名空间:

Windows.Devices.Bluetooth.GenericAttributeProfile

重载

ReadValueAsync()	执行从 Windows 维护的值缓存中读取的特征值。
ReadValueAsync(BluetoothCacheMode)	从 Windows 维护的值缓存或直接从设备执行特征值读取。

ReadValueAsync()

执行从 Windows 维护的值缓存中读取的特征值。

public:
 virtual IAsyncOperation<GattReadResult ^> ^ ReadValueAsync() = ReadValueAsync;

/// [Windows.Foundation.Metadata.Overload("ReadValueAsync")]
/// [Windows.Foundation.Metadata.RemoteAsync]
IAsyncOperation<GattReadResult> ReadValueAsync();

[Windows.Foundation.Metadata.Overload("ReadValueAsync")]
[Windows.Foundation.Metadata.RemoteAsync]
public IAsyncOperation<GattReadResult> ReadValueAsync();

function readValueAsync()

Public Function ReadValueAsync () As IAsyncOperation(Of GattReadResult)

返回

IAsyncOperation<GattReadResult>

管理异步操作所需的 对象，该对象在完成后返回 GattReadResult 对象，该对象又包含异步操作的完成状态，如果成功，则包含从设备读取的数据。

属性

OverloadAttribute RemoteAsyncAttribute

Windows 要求

应用功能

bluetooth

另请参阅

• ReadValueAsync(BluetoothCacheMode)

ReadValueAsync(BluetoothCacheMode)

从 Windows 维护的值缓存或直接从设备执行特征值读取。

public:
 virtual IAsyncOperation<GattReadResult ^> ^ ReadValueAsync(BluetoothCacheMode cacheMode) = ReadValueAsync;

/// [Windows.Foundation.Metadata.Overload("ReadValueWithCacheModeAsync")]
/// [Windows.Foundation.Metadata.RemoteAsync]
IAsyncOperation<GattReadResult> ReadValueAsync(BluetoothCacheMode const& cacheMode);

[Windows.Foundation.Metadata.Overload("ReadValueWithCacheModeAsync")]
[Windows.Foundation.Metadata.RemoteAsync]
public IAsyncOperation<GattReadResult> ReadValueAsync(BluetoothCacheMode cacheMode);

function readValueAsync(cacheMode)

Public Function ReadValueAsync (cacheMode As BluetoothCacheMode) As IAsyncOperation(Of GattReadResult)

参数

cacheMode

BluetoothCacheMode

指定是直接从设备读取值，还是从 Windows 维护的值缓存中读取值。

返回

IAsyncOperation<GattReadResult>

管理异步操作所需的 对象，该对象在完成后返回 GattReadResult 对象，该对象又包含异步操作的完成状态，如果成功，则包含从设备读取的数据。

属性

OverloadAttribute RemoteAsyncAttribute

Windows 要求

应用功能

bluetooth

另请参阅

• ReadValueAsync()