- Qt 5.5
- Qt Bluetooth
- Bluetooth Low Energy Scanner Example
- characteristicinfo.cpp Example File
- Qt 5.5.1 Reference Documentation

# characteristicinfo.cpp Example File

lowenergyscanner/characteristicinfo.cpp

    /***************************************************************************
    **
    ** Copyright (C) 2013 BlackBerry Limited. All rights reserved.
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the QtBluetooth module of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
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    **     notice, this list of conditions and the following disclaimer.
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    #include "characteristicinfo.h"
    #include "qbluetoothuuid.h"
    #include <QByteArray>

    CharacteristicInfo::CharacteristicInfo()
    {
    }

    CharacteristicInfo::CharacteristicInfo(const QLowEnergyCharacteristic &characteristic):
        m_characteristic(characteristic)
    {
    }

    void CharacteristicInfo::setCharacteristic(const QLowEnergyCharacteristic &characteristic)
    {
        m_characteristic = characteristic;
        emit characteristicChanged();
    }

    QString CharacteristicInfo::getName() const
    {
        QString name = m_characteristic.name();
        if (!name.isEmpty())
            return name;

        // find descriptor with CharacteristicUserDescription
        foreach (const QLowEnergyDescriptor &descriptor, m_characteristic.descriptors()) {
            if (descriptor.type() == QBluetoothUuid::CharacteristicUserDescription) {
                name = descriptor.value();
                break;
            }
        }

        if (name.isEmpty())
            name = "Unknown";

        return name;
    }

    QString CharacteristicInfo::getUuid() const
    {
        const QBluetoothUuid uuid = m_characteristic.uuid();
        bool success = false;
        quint16 result16 = uuid.toUInt16(&success);
        if (success)
            return QStringLiteral("0x") + QString::number(result16, 16);

        quint32 result32 = uuid.toUInt32(&success);
        if (success)
            return QStringLiteral("0x") + QString::number(result32, 16);

        return uuid.toString().remove(QLatin1Char('{')).remove(QLatin1Char('}'));
    }

    QString CharacteristicInfo::getValue() const
    {
        // Show raw string first and hex value below
        QByteArray a = m_characteristic.value();
        QString result;
        if (a.isEmpty()) {
            result = QStringLiteral("<none>");
            return result;
        }

        result = a;
        result += QLatin1Char('\n');
        result += a.toHex();

        return result;
    }

    QString CharacteristicInfo::getHandle() const
    {
        return QStringLiteral("0x") + QString::number(m_characteristic.handle(), 16);
    }

    QString CharacteristicInfo::getPermission() const
    {
        QString properties = "( ";
        int permission = m_characteristic.properties();
        if (permission & QLowEnergyCharacteristic::Read)
            properties += QStringLiteral(" Read");
        if (permission & QLowEnergyCharacteristic::Write)
            properties += QStringLiteral(" Write");
        if (permission & QLowEnergyCharacteristic::Notify)
            properties += QStringLiteral(" Notify");
        if (permission & QLowEnergyCharacteristic::Indicate)
            properties += QStringLiteral(" Indicate");
        if (permission & QLowEnergyCharacteristic::ExtendedProperty)
            properties += QStringLiteral(" ExtendedProperty");
        if (permission & QLowEnergyCharacteristic::Broadcasting)
            properties += QStringLiteral(" Broadcast");
        if (permission & QLowEnergyCharacteristic::WriteNoResponse)
            properties += QStringLiteral(" WriteNoResp");
        if (permission & QLowEnergyCharacteristic::WriteSigned)
            properties += QStringLiteral(" WriteSigned");
        properties += " )";
        return properties;
    }

    QLowEnergyCharacteristic CharacteristicInfo::getCharacteristic() const
    {
        return m_characteristic;
    }