c/c++ windows ble 蓝牙

前言：

在使用c/c++ 通过winrt 操作ble蓝牙之前，本身采用了qt的ble蓝牙库去操作，但是最后发现qt的ble只能使用在msvc+qt中使用，其他的使用的时候就会在扫描的时候没有反应，最终又只能在比较了解ble的同事帮助之下去研究 微软的使用c/c++ 通过winrt 操作ble蓝牙，另外如果不用通过广播过滤设备可以使用第三方库WCHBleLib_MultiOS或者是BleWinrtDll，如果想多深入了解的话也可以参考微软写的demoBluetoothLE，关于微软操作ble接口说明文档地址是bluetoothleadvertisement

注意事项：

1.使用该方式的时候c++的版本要设置为 c++17

2.引用的头文件为：

#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #includeusing namespace winrt;using namespace Windows::Devices::Bluetooth;using namespace Windows::Devices::Bluetooth::Advertisement;using namespace Windows::Devices::Bluetooth::GenericAttributeProfile;using namespace winrt::Windows::Devices::Radios;using namespace Windows::Foundation;#pragma comment(lib, "windowsapp")#pragma comment(lib, "WindowsApp.lib")using namespace std;

1.获取电脑是否支持ble蓝牙和蓝牙是否打开

bool BLEIsLowEnergySupported() { auto getadapter_op = Windows::Devices::Bluetooth::BluetoothAdapter::GetDefaultAsync(); auto adapter = getadapter_op.get(); auto supported = adapter.IsLowEnergySupported(); // 获取windows电脑是否支持ble if (supported == false) return false; auto async = adapter.GetRadioAsync(); //获取本地蓝牙信息 auto radio = async.get(); auto t = radio.State(); // 获取电脑蓝牙状态 0未知，1打开，2关闭，3硬件关闭或禁用 if (t != winrt::Windows::Devices::Radios::RadioState::On) {return false; } return true;}

LPWSTRT 与char 互转

LPWSTR ConvertCharToLPWSTR(char* szString, WCHAR* addrchar){ int dwLen = strlen(szString) + 1; int nwLen = MultiByteToWideChar(CP_ACP, 0, szString, dwLen, NULL, 0);//算出合适的长度 MultiByteToWideChar(CP_ACP, 0, szString, dwLen, addrchar, nwLen); return addrchar;}unsigned char* ConvertLPWSTRToChar(LPCTSTR widestr, unsigned char* addrchar){ int num = WideCharToMultiByte(CP_OEMCP, NULL, widestr, -1, NULL, 0, NULL, FALSE); WideCharToMultiByte(CP_OEMCP, NULL, widestr, -1, (char*)addrchar, num, NULL, FALSE); return addrchar;}

2.扫描ble蓝牙

void Scanblebackfun(BluetoothLEAdvertisementWatcher w, BluetoothLEAdvertisementReceivedEventArgs e) // 扫描到的ble蓝牙设备通过此回调方式返回{ if (e.AdvertisementType() == BluetoothLEAdvertisementType::ConnectableUndirected) {uint64_t address = e.BluetoothAddress(); //获取蓝牙地址，建议不用转字符串太麻烦auto Rssi = e.RawSignalStrengthInDBm(); //获取蓝牙信号强度//保存有效地址BluetoothLEDevice dev = BluetoothLEDevice::FromBluetoothAddressAsync(address).get();int cid = 0;auto id = dev.BluetoothDeviceId(); //获取蓝牙唯一idauto name = dev.Name(); //获取蓝牙名称char ID[50] = {0};char Name[50] = {0};ConvertLPWSTRToChar(id.Id().c_str(), (unsigned char*)ID);ConvertLPWSTRToChar(name.c_str(), (unsigned char*)Name);auto advertisement = e.Advertisement(); //获取蓝牙广播auto serviceUuids = advertisement.ServiceUuids(); //获取广播的服务器的uuidauto view = serviceUuids.GetView();bool Isfindguid = false;for (size_t i = 0; i < view.Size(); i++){ auto guid = view.GetAt(i); if (guid.Data1 == 0xf801 ) { //获取自己需要的广播Isfindguid = true; }}dev.Close();if (Isfindguid == false) return;}void ScanBLEDevice(int timeout) { BluetoothLEAdvertisementWatcher m_btWatcher; m_btWatcher.ScanningMode(BluetoothLEScanningMode::Passive); //扫描所有此时没有连接的蓝牙 m_btWatcher.Received(Scanblebackfun); // 注册扫描到的蓝牙回调 Pens.clear(); m_btWatcher.Start(); //开始扫描 Sleep(timeout); m_btWatcher.Stop();//结束扫描}

3.连接蓝牙获取服务和特征

void Characteristic_ValueChanged(GattCharacteristic const& characteristic, GattValueChangedEventArgs args){//订阅回传的数据}BLEHandle ConnectBLEDevice(char * id) {WCHAR ID[255] = { 0 };ConvertCharToLPWSTR(id, ID);hstring hst(ID);auto device = BluetoothLEDevice::FromIdAsync(hst).get();auto result = device.GetGattServicesAsync(BluetoothCacheMode::Uncached).get();//连接蓝牙服务auto services = result.Services();for (size_t i = 0; i < services.Size(); i++){auto service = services.GetAt(i);auto uuid = service.Uuid(); //获取服务uuidauto charact = service.GetCharacteristicsAsync().get();auto characts = charact.Characteristics();for (size_t j = 0; j < characts.Size(); j++){auto charact = characts.GetAt(j);auto uuid = charact.Uuid(); //获取子服务的uuidauto GAttpro = charact.CharacteristicProperties(); //获取每个子服务特征值if (GAttpro == GattCharacteristicProperties::Notify) {charact.WriteClientCharacteristicConfigurationDescriptorAsync(GattClientCharacteristicConfigurationDescriptorValue::Notify);//注册订阅charact.ValueChanged(auto_revoke, &Characteristic_ValueChanged); //设置订阅数据回传的回调}if (GAttpro == GattCharacteristicProperties::Write) {//写入数据unsigned char* buff = "123456";unsigned int lenght = 6;winrt::Windows::Storage::Streams::DataWriter writer;writer.WriteBytes(array_view(buff, buff + lenght));winrt::Windows::Storage::Streams::IBuffer buffer = writer.DetachBuffer();charact.WriteValueAsync(buffer);}if (GAttpro == GattCharacteristicProperties::Read) {}if (GAttpro == (GattCharacteristicProperties::Write | GattCharacteristicProperties::WriteWithoutResponse)) {}if (GAttpro == (GattCharacteristicProperties::Notify | GattCharacteristicProperties::Write)) {}if (GAttpro == (GattCharacteristicProperties::Notify | GattCharacteristicProperties::Read)) {}if (GAttpro == (GattCharacteristicProperties::Write | GattCharacteristicProperties::Read)) {}return;}}}