查找蓝牙WiFi功能，搜索名字并列举出来

先有一个概念，蓝牙分为普通蓝牙和低功耗(BLE)蓝牙，

低功耗蓝牙激活时信号和普通蓝牙信号一样，低功耗时必须搜索低功耗蓝牙信号

如果使用普通代码搜索，不能搜索到低功耗蓝牙信号，

例如打开手机的蓝牙功能，进入蓝牙界面，此时蓝牙是激活状态，可以搜到蓝牙信号，锁屏后蓝牙进入低功耗模式，此时搜不到蓝牙信号，其他手机电脑又是如何搜索到低功耗蓝牙的信号呢，因为他们是增加了这个功能的

他们是即搜索普通蓝牙信号又搜索低功耗蓝牙信号，把2个搜索加起来就是看到的手机蓝牙列表和电脑上的蓝牙设备列表

搜索普通蓝牙信号

public string GetAllNameSearchBluetooth()
{
    string strTemp, strBTName;
    int iBTCount = 0;
    strBTName = "";

    BluetoothRadio radio = BluetoothRadio.PrimaryRadio;  //获取自己蓝牙信息
    if (radio == null)
    {
        strBTName = "";
    }
    BluetoothClient client = new BluetoothClient();     //处理蓝牙的对象
    radio.Mode = RadioMode.Connectable;     //设置电脑蓝牙可被搜索到
    try
    {
        BluetoothDeviceInfo[] devices = client.DiscoverDevices();   //搜索蓝牙设备，10秒
        foreach (var item in devices)
        {
            iBTCount++;
            Console.WriteLine(item.DeviceName);
            strTemp = item.DeviceName + ",";
            strBTName += strTemp;
        }

        strBTName = iBTCount.ToString() + "," + strBTName;
    }
    catch (Exception ea)
    {
        strBTName = "";
    }


    return strBTName;
}

搜索低功耗蓝牙demo

https://www.wch.cn/downloads/WCHBleLib_MultiOS_ZIP.html

用 WCHBLEDLL.dll WCHBLEDLL.h WCHBLEDLL.lib 这个动态库查找低功耗蓝牙信号和普通蓝牙信号

int scanTimes = 1000, scannum = 20;
char DevIDFilter[100] = "";
CHAR bleMac[100] = "";
PCHAR mactemp = NULL;

if (!WCHBLEIsBluetoothOpened())
{
    pError = "请先打开系统蓝牙！";
    return 1;
}

memset(g_BLEDev, 0, sizeof(g_BLEDev));
WCHBLEEnumDevice(scanTimes, DevIDFilter, g_BLEDev, (ULONG*)&scannum);
CString strMsg;
scannum;//搜索到的蓝牙个数
for (int i = 0; i < scannum; ++i)
{
    memcpy(bleMac, g_BLEDev[i].DevID, 100);
    mactemp = strchr(bleMac, '-');
    g_BLEDev[i].Name;

    strMsg.Format("%s", g_BLEDev[i].Name);//名字
}

搜索WiFi信号

HANDLE hClient = NULL;
DWORD dwMaxClient = 2;
DWORD dwCurVersion = 0;
DWORD dwResult = 0;
DWORD dwRetVal = 0;
int iRet = 0;

WCHAR GuidString[39] = { 0 };

unsigned int i, j, k;
/* variables used for WlanEnumInterfaces  */

PWLAN_INTERFACE_INFO_LIST pIfList = NULL;
PWLAN_INTERFACE_INFO pIfInfo = NULL;

PWLAN_AVAILABLE_NETWORK_LIST pBssList = NULL;
PWLAN_AVAILABLE_NETWORK pBssEntry = NULL;

int iRSSI = 0;

dwResult = WlanOpenHandle(dwMaxClient, NULL, &dwCurVersion, &hClient);
if (dwResult != ERROR_SUCCESS)
{
    pError = "查找WiFi时发生错误1";
    return 1;
}

dwResult = WlanEnumInterfaces(hClient, NULL, &pIfList);
if (dwResult != ERROR_SUCCESS)
{
    pError = "查找WiFi时发生错误2";
    return 1;
}
else
{
    for (i = 0; i < (int)pIfList->dwNumberOfItems; i++)
    {
        pIfInfo = (WLAN_INTERFACE_INFO *)&pIfList->InterfaceInfo[i];
        iRet = StringFromGUID2(pIfInfo->InterfaceGuid, (LPOLESTR)&GuidString, sizeof(GuidString) / sizeof(*GuidString));
        dwResult = WlanGetAvailableNetworkList(hClient, &pIfInfo->InterfaceGuid, 0, NULL, &pBssList);
        if (dwResult != ERROR_SUCCESS)
        {
            //wprintf(L"WlanGetAvailableNetworkList failed with error: %u\n",dwResult);
            dwRetVal = 1;
            // You can use FormatMessage to find out why the function failed
            pError = "查找WiFi时发生错误3";
            return 1;
        }
        else
        {
            //获取Wlan的网卡接口数据
            dwResult = WlanEnumInterfaces(hClient, NULL, &pIfList);
            if (dwResult != ERROR_SUCCESS)
            {
                return false;
            }

            for (i = 0; i < (int)pIfList->dwNumberOfItems; i++) //遍历每个网卡
            {
                pIfInfo = (WLAN_INTERFACE_INFO*)&pIfList->InterfaceInfo[i];

                dwResult = StringFromGUID2(pIfInfo->InterfaceGuid, (LPOLESTR)&GuidString,
                    sizeof(GuidString) / sizeof(*GuidString));

                // 向无线网卡发送探测请求，WlanScan探测会在4秒内陆续更新WIFIList
                dwResult = WlanScan(hClient, (const GUID*)(&pIfInfo->InterfaceGuid), NULL, NULL, NULL);
                if (dwResult != ERROR_SUCCESS)
                {
                    return false;
                }
            }
            Sleep(5000);

            CString strTemp, strMsg;
            pBssList->dwNumberOfItems;//个数
            for (j = 0; j < pBssList->dwNumberOfItems; j++)
            {
                pBssEntry = (WLAN_AVAILABLE_NETWORK *)& pBssList->Network[j];
                if (pBssEntry->dot11Ssid.uSSIDLength == 0)
                {
                    //wprintf(L"\n");
                }
                else
                {
                    strMsg.Empty();
                    for (k = 0; k < pBssEntry->dot11Ssid.uSSIDLength; k++)
                    {
                        strTemp.Format(_T("%c"), pBssEntry->dot11Ssid.ucSSID[k]);
                        strMsg += strTemp;
                    }
                    AfxMessageBox(strMsg);//WiFi名字
                    if (j >= 50)
                    {
                        break;
                    }
                }
            }
        }
    }

}
if (pBssList != NULL)
{
    WlanFreeMemory(pBssList);
    pBssList = NULL;
}

if (pIfList != NULL)
{
      WlanFreeMemory(pIfList);
      pIfList = NULL;
}