蓝牙串口开发1

文件目录

.pro文件需加此依赖，并且需要用msvc编译器 这个用的是2017 32bit

QT      += bluetooth

widget.h

#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QListWidgetItem>
#include <QtBluetooth/qbluetoothglobal.h>
#include <QtBluetooth/qbluetoothlocaldevice.h>
#include <qbluetoothaddress.h>
#include <qbluetoothdevicediscoveryagent.h>
#include <qbluetoothlocaldevice.h>
#include <qbluetoothsocket.h>
#define MAX_LENGTH 256
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
    Q_OBJECT
public:
    explicit Widget(QWidget *parent = nullptr);
    ~Widget();
private slots:
    void on_pushButton_scan_clicked();
    void addBlueToothDevicesToList(const QBluetoothDeviceInfo&);
    void on_pushButton_openBluetooth_clicked();
    void on_pushButton_closeDevice_clicked();
    void itemActivated(QListWidgetItem *item);
    void readBluetoothDataEvent();
    void bluetoothConnectedEvent();
    void bluetoothDisconnectedEvent();
    void on_pushButton_disconnect_clicked();
    void on_pushButton_send_clicked();
    void on_pushButton_clear_clicked();
private:
    Ui::Widget *ui;
    // 用来对周围蓝牙进行搜寻
    QBluetoothDeviceDiscoveryAgent *discoveryAgent;
    // 对本地设备进行操作
    QBluetoothLocalDevice *localDevice;
    // 进行蓝牙配对链接和数据传输
    QBluetoothSocket *socket;
    unsigned char comBuffer[15];
    unsigned int  comCount;
    QString comStr;
};
#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include "QMessageBox"
static const QLatin1String serviceUuid("00001101-0000-1000-8000-00805F9B34FB");
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    discoveryAgent = new QBluetoothDeviceDiscoveryAgent();
    localDevice = new QBluetoothLocalDevice();
    socket = new QBluetoothSocket(QBluetoothServiceInfo::RfcommProtocol);
    // 蓝牙进行查找
    connect(discoveryAgent,
            SIGNAL(deviceDiscovered(QBluetoothDeviceInfo)),
            this,
            SLOT(addBlueToothDevicesToList(QBluetoothDeviceInfo))
            );
    connect(ui->list,
            SIGNAL(itemActivated(QListWidgetItem*)),
            this,
            SLOT(itemActivated(QListWidgetItem*))
            );
    connect(socket,
            SIGNAL(readyRead()),
            this,
            SLOT(readBluetoothDataEvent())
            );
    connect(socket,
            SIGNAL(connected()),
            this,
            SLOT(bluetoothConnectedEvent())
            );
    connect(socket,
            SIGNAL(disconnected()),
            this,
            SLOT(bluetoothDisconnectedEvent())
            );
    // 对本地设备模式进行判断
    if( localDevice->hostMode() == QBluetoothLocalDevice::HostPoweredOff ) {
        ui->pushButton_openBluetooth->setEnabled(true);
        ui->pushButton_closeDevice->setEnabled(false);
    }else {
        ui->pushButton_openBluetooth->setEnabled(false);
        ui->pushButton_closeDevice->setEnabled(true);
    }
    // 蓝牙可见
    if( localDevice->hostMode() == QBluetoothLocalDevice::HostDiscoverable ) {
        ui->checkBox_discoverable->setChecked(true);
    }else {
        ui->checkBox_discoverable->setChecked(false);
    }
}
Widget::~Widget()
{
    delete ui;
}
void Widget::on_pushButton_scan_clicked()
{
    discoveryAgent->start();
    ui->pushButton_scan->setEnabled(false);
}
// 将搜索的蓝牙显示在界面
void Widget::addBlueToothDevicesToList( const QBluetoothDeviceInfo &info )
{
    // %1为蓝牙设备的地址，%2为蓝牙设备的名字
    QString label = QString("%1 %2").arg(info.address().toString()).arg(info.name());
    QList<QListWidgetItem *> items = ui->list->findItems(label, Qt::MatchExactly);
    if (items.empty()) {
        QListWidgetItem *item = new QListWidgetItem(label);
        QBluetoothLocalDevice::Pairing pairingStatus = localDevice->pairingStatus(info.address());
        // 蓝牙状态pairingStatus，Pairing枚举类型 0:Unpaired没配对 1:Paired配对但没授权 2:AuthorizedPaired配对且授权
        if (pairingStatus == QBluetoothLocalDevice::Paired || pairingStatus == QBluetoothLocalDevice::AuthorizedPaired )
            item->setTextColor(QColor(Qt::green));
        else
            item->setTextColor(QColor(Qt::black));
        // 输出显示
        ui->list->addItem(item);
    }
}
// open按钮的槽函数
void Widget::on_pushButton_openBluetooth_clicked()
{
    localDevice->powerOn();
    ui->pushButton_closeDevice->setEnabled(true);
    ui->pushButton_openBluetooth->setEnabled(false);
    ui->pushButton_scan->setEnabled(true);
}
// close按钮的槽函数
void Widget::on_pushButton_closeDevice_clicked()
{
    localDevice->setHostMode(QBluetoothLocalDevice::HostPoweredOff);
    ui->pushButton_closeDevice->setEnabled(false);
    ui->pushButton_openBluetooth->setEnabled(true);
    ui->pushButton_scan->setEnabled(false);
}
//
void Widget::itemActivated(QListWidgetItem *item)
{
    QString text = item->text();
    int index = text.indexOf(' ');
    if (index == -1)
        return;
    QBluetoothAddress address(text.left(index));
    QString name(text.mid(index + 1));
    qDebug() << "You has choice the bluetooth address is " << address;
    qDebug() << "The device is connneting.... ";
    QMessageBox::information(this,tr("Info"),tr("The device is connecting..."));
    socket->connectToService(address, QBluetoothUuid(serviceUuid) ,QIODevice::ReadWrite);
}
// 读取数据
void Widget::readBluetoothDataEvent()
{
    QByteArray line = socket->readAll();
    QString strData = line.toHex();
    comStr.append(strData);
    qDebug() <<"rec data is: "<< comStr;
    qDebug() <<"The comStr length is: " << comStr.length();
    if(comStr.length() >= 30) {
        ui->textBrowser_info->append(comStr + "\n");
        comStr.clear();
    }
}
// 选择的蓝牙设备进行链接
void Widget::bluetoothConnectedEvent()
{
    qDebug() << "The android device has been connected successfully!";
    QMessageBox::information(this,tr("Info"),tr("successful connection!"));
}
// 断开连接
void Widget::bluetoothDisconnectedEvent()
{
    qDebug() << "The android device has been disconnected successfully!";
    QMessageBox::information(this,tr("Info"),tr("successful disconnection!"));
}
// 断开连接函数
void Widget::on_pushButton_disconnect_clicked()
{
    socket->disconnectFromService();
}
// 发送信息
void Widget::on_pushButton_send_clicked()
{
    QByteArray arrayData;
    QString s("Hello Windows!!!\nThis message is sended via bluetooth of android device!\n");
    arrayData = s.toUtf8();
    socket->write(arrayData);
}
void Widget::on_pushButton_clear_clicked()
{
    ui->textBrowser_info->clear();
}

参考文章：https://www.cnblogs.com/sigma0/p/5769527.html

文件：
QT_Bluetooth_An.zip