Qt Bluetooth

蓝牙 API 提供蓝牙使能设备之间的连接。

目前,API 支持下列平台:

API 特征 Android iOS Linux (BlueZ 4.x/5.x) macOS UWP (通用 Windows 平台) Win32
经典蓝牙 x x x x x
蓝牙 LE 中心 x x x x x x
蓝牙 LE 外围 x x x x
蓝牙 LE 广告和扫描

Qt 5.14 adds a native Win32 port supporting Classic Bluetooth on Windows 7 or newer, and Bluetooth LE on Windows 8 or newer. It must be enabled at build time by configuration option -native-win32-bluetooth. The UWP backend is used by default if this option is not set and the Win32 target platform supports the required UWP APIs (minimal requirement is Windows 10 version 1507, with slightly improved service discovery since Windows 10 version 1607).

概述

Bluetooth is a short-range (less than 100 meters) wireless technology. It has a reasonably high data transfer rate of 2.1 Mbit/s, which makes it ideal for transferring data between devices. Bluetooth connectivity is based on basic device management, such as scanning for devices, gathering information about them, and exchanging data between them.

Qt Bluetooth supports Bluetooth Low Energy development for client/central role use cases. Further details can be found in the 低功耗蓝牙概述 章节。

A new addition since the Qt Bluetooth 5.7 release covers support for Bluetooth Low Energy applications performing the peripheral/server role. This new API remains in Technology Preview.

快速入门

要使用 C++ 库在应用程序,添加以下配置选项到 .pro 文件:

QT += bluetooth
							

要在应用程序中使用模块的类,需要以下 import 语句在 .qml 文件:

import QtBluetooth 5.12
							

构建 Qt Bluetooth

Despite the fact that the module can be built for all Qt platforms, the module is not ported to all of them. Not supported platforms employ a fake or dummy backend which is automatically selected when the platform is not supported. The dummy backend reports appropriate error messages and values which allow the Qt Bluetooth developer to detect at runtime that the current platform is not supported. The dummy backend is also selected on Linux if BlueZ development headers are not found during build time or Qt was built without Qt D-Bus support.

The usage of the dummy backend is highlighted via an appropriate warning while building and running.

指南

参考

日志类别

QtBluetooth 模块导出下列 日志类别 :

日志类别 描述
qt.bluetooth Enables logging of cross platform code path in QtBluetooth
qt.bluetooth.android Enables logging of the Android 实现
qt.bluetooth.bluez Enables logging of the BLuez /Linux implementation
qt.bluetooth.ios Enables logging of the iOS 实现
qt.bluetooth.osx Enables logging of the macOS 实现
qt.bluetooth.qml Enables logging of the QtBluetooth QML implementation
qt.bluetooth.winrt Enables logging of the UWP (通用 Windows 平台) 实现
qt.bluetooth.windows Enables logging of the Win32 实现

Logging categories can be used to enable additional warning and debug output for QtBluetooth . More detailed information about logging can be found in QLoggingCategory . A quick way to enable all QtBluetooth logging is to add the following line to the main() 函数:

QLoggingCategory::setFilterRules(QStringLiteral("qt.bluetooth* = true"));
							

范例

许可和归属

Qt Bluetooth is available under commercial licenses from Qt 公司 。此外,它是可用的在 GNU LGPL (次一般公共许可) 第 3 版 ,或 GNU GPL (一般公共许可) 第 2 版 。见 Qt 许可 进一步了解细节。

On Linux, Qt Bluetooth uses a separate executable, sdpscanner , to integrate with the official Linux bluetooth protocol stack BlueZ . BlueZ is available under the GNU GPL (一般公共许可) 第 2 版 .

BlueZ

GNU General Public License v2.0 only (This does not force user code to be GPL'ed. For more info see details.)