The QLowEnergyDescriptor class stores information about the Bluetooth Low Energy descriptor. 更多...
| 头： | #include <QLowEnergyDescriptor> |
| qmake: | QT += bluetooth |
| Since: | Qt 5.4 |
| QLowEnergyDescriptor () | |
| QLowEnergyDescriptor (const QLowEnergyDescriptor & other ) | |
| ~QLowEnergyDescriptor () | |
| QLowEnergyHandle | handle () const |
| bool | isValid () const |
| QString | name () const |
| QBluetoothUuid::DescriptorType | type () const |
| QBluetoothUuid | uuid () const |
| QByteArray | value () const |
| bool | operator!= (const QLowEnergyDescriptor & other ) const |
| QLowEnergyDescriptor & | operator= (const QLowEnergyDescriptor & other ) |
| bool | operator== (const QLowEnergyDescriptor & other ) const |
The QLowEnergyDescriptor class stores information about the Bluetooth Low Energy descriptor.
QLowEnergyDescriptor provides information about a Bluetooth Low Energy descriptor's name (), uuid (), value () 和 handle (). Descriptors are encapsulated by Bluetooth Low Energy characteristics and provide additional centextual information about the characteristic (data format, notification activation and so on).
The descriptor value may be written via the QLowEnergyService instance that manages the service to which this descriptor belongs. The QLowEnergyService::writeDescriptor () function writes the new value. The QLowEnergyService::descriptorWritten () signal is emitted upon success. The cahced value () of this object is updated accordingly.
另请参阅 QLowEnergyService and QLowEnergyCharacteristic .
Construct a new QLowEnergyDescriptor . A default-constructed instance of this class is always invalid.
Construct a new QLowEnergyDescriptor that is a copy of other .
The two copies continue to share the same underlying data which does not detach upon write.
销毁 QLowEnergyDescriptor 对象。
Returns the handle of the descriptor or
0
if the handle cannot be accessed on the platform or the descriptor is invalid.
注意： On macOS and iOS handles can differ from 0, but these values have no special meaning outside of internal/private API.
返回
true
若
QLowEnergyDescriptor
object is valid, otherwise returns
false
.
An invalid descriptor instance is not associated with any service (default-constructed) or the associated service is no longer valid due to a disconnect from the underlying Bluetooth Low Energy device, for example. Once the object is invalid it cannot become valid anymore.
注意： 若 QLowEnergyDescriptor instance turns invalid due to a disconnect from the underlying device, the information encapsulated by the current instance remains as it was at the time of the disconnect. Therefore it can be retrieved after the disconnect event.
Returns the human-readable name of the descriptor.
The name is based on the descriptor's type (). The complete list of descriptor types can be found under Bluetooth.org Descriptors .
The returned string is empty if the type () is unknown.
另请参阅 type () 和 QBluetoothUuid::descriptorToString ().
Returns the type of the descriptor.
另请参阅 name ().
Returns the UUID of this descriptor if
isValid
() 返回
true
; otherwise a
null
UUID.
Returns the cached value of the descriptor.
The cached descriptor value may be updated using QLowEnergyService::writeDescriptor () 或 QLowEnergyService::readDescriptor ().
返回
true
if
other
不等于此
QLowEnergyCharacteristic
；否则
false
.
Two QLowEnergyDescriptor instances are considered to be equal if they refer to the same descriptor on the same remote Bluetooth Low Energy device or both instances have been default-constructed.
制作副本为 other 并将其赋值给此 QLowEnergyDescriptor object. The two copies continue to share the same service and controller details.
返回
true
if
other
is equal to this
QLowEnergyCharacteristic
；否则
false
.
Two QLowEnergyDescriptor instances are considered to be equal if they refer to the same descriptor on the same remote Bluetooth Low Energy device or both instances have been default-constructed.
