QT中将文件数据以512字节长度发给低功耗蓝牙特征值,用GATT协议
时间: 2024-02-12 15:06:41 浏览: 22
在QT中,可以使用QLowEnergyController和QLowEnergyService来进行低功耗蓝牙通信。以下是将文件数据以512字节长度发送到低功耗蓝牙特征值的示例代码:
```
QLowEnergyController *controller = new QLowEnergyController(/*蓝牙设备地址*/, this);
connect(controller, &QLowEnergyController::connected, this, &MyClass::controllerConnected);
connect(controller, &QLowEnergyController::disconnected, this, &MyClass::controllerDisconnected);
controller->connectToDevice();
QLowEnergyService *service = nullptr;
void MyClass::controllerConnected()
{
controller->discoverServices();
}
void MyClass::serviceDiscovered(const QBluetoothUuid &uuid)
{
if (uuid == /*特征值UUID*/) {
service = controller->createServiceObject(uuid, this);
connect(service, &QLowEnergyService::stateChanged, this, &MyClass::serviceStateChanged);
connect(service, &QLowEnergyService::characteristicChanged, this, &MyClass::handleCharacteristicChanged);
service->discoverDetails();
}
}
void MyClass::serviceDetailsDiscovered()
{
QLowEnergyCharacteristic characteristic = /*获取特征值*/;
QFile file(/*文件路径*/);
if (!file.open(QFile::ReadOnly)) {
qDebug() << "Failed to open file!";
return;
}
QByteArray data = file.readAll();
file.close();
const int chunkSize = 512;
for (int i = 0; i < data.size(); i += chunkSize) {
QByteArray chunk = data.mid(i, chunkSize);
service->writeCharacteristic(characteristic, chunk, QLowEnergyService::WriteWithoutResponse);
}
}
void MyClass::handleCharacteristicChanged(const QLowEnergyCharacteristic &characteristic, const QByteArray &value)
{
if (characteristic.uuid() == /*特征值UUID*/) {
qDebug() << "Characteristic value changed:" << value;
}
}
```
这段代码通过QLowEnergyController连接到低功耗蓝牙设备,然后通过QLowEnergyService获取到需要传输数据的特征值,并将文件读入一个QByteArray中,然后将其分为大小为512字节的块,并逐一将这些块写入特征值中。需要注意的是,在每次写入块后,使用QLowEnergyService::WriteWithoutResponse参数来确保数据已被发送到蓝牙设备。写入完成后,可以在handleCharacteristicChanged()函数中获取特征值的值,以确认数据已被正确接收。