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Strong Wi-Fi Signal Strength

I am trying to get the strength of a connected Wi-Fi signal using C ++ on a computer running Windows 7.

I can get the signal strength value using the command WlanGetAvailableNetworkList, but the return value is not enough for our requirements, Basically, when you leave the Wifi router, the value of the jumps increases in increments of 20% (99% → 80% → 60%, etc.) .

For the application under development, we really need a more accurate value. I know that this is possible since I saw applications in windows displaying exact dBm values ​​for signal level ...

If anyone has any suggestions, they will be very grateful!

dwResult = WlanGetAvailableNetworkList(hClient,&pIfInfo->InterfaceGuid,0,NULL,&pBssList);

if (dwResult != ERROR_SUCCESS) {
    wprintf(L"WlanGetAvailableNetworkList failed with error: %u\n", dwResult);
    dwRetVal = 1;

} else {

    for (j = 0; j < pBssList->dwNumberOfItems; j++) {
        pBssEntry = (WLAN_AVAILABLE_NETWORK *) & pBssList->Network[j];

        if ((pBssEntry->dwFlags & WLAN_AVAILABLE_NETWORK_CONNECTED ) != 0 ){

            if (pBssEntry->wlanSignalQuality == 0)
                iRSSI = -100;
            else if (pBssEntry->wlanSignalQuality == 100)   
                iRSSI = -50;
            else
                iRSSI = -100 + (pBssEntry->wlanSignalQuality/2);    

            wprintf(L"  Signal Quality[%u]:\t %u (RSSI: %i dBm)\n", j, 
                pBssEntry->wlanSignalQuality, iRSSI);
        }
}
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- , . , , RSSI, , , ...

WlanGetNetworkBssList, RSSI PWLAN_BSS_ENTRY.

, WlanScan WlanGetNetworkBssList, - .

HANDLE hClient;
PWLAN_INTERFACE_INFO_LIST pIfList = NULL;
PWLAN_INTERFACE_INFO pIfConnInfo = NULL;
PWLAN_CONNECTION_ATTRIBUTES pConnectInfo = NULL;

PWLAN_BSS_LIST pBssList=NULL;
PWLAN_BSS_ENTRY  pBssEntry=NULL;
WLAN_OPCODE_VALUE_TYPE opCode = wlan_opcode_value_type_invalid;

DWORD dwResult = 0;
DWORD dwMaxClient = 2;         
DWORD dwCurVersion = 0;
DWORD connectInfoSize = sizeof(WLAN_CONNECTION_ATTRIBUTES);

int i;

// Initialise the Handle
dwResult = WlanOpenHandle(dwMaxClient, NULL, &dwCurVersion, &hClient);
if (dwResult != ERROR_SUCCESS) 
{    
    return 0;
}

// Get the Interface List
dwResult = WlanEnumInterfaces(hClient, NULL, &pIfList);
if (dwResult != ERROR_SUCCESS) 
{    
    return 0;
}

//Loop through the List to find the connected Interface
PWLAN_INTERFACE_INFO pIfInfo = NULL;
for (i = 0; i < (int) pIfList->dwNumberOfItems; i++) 
{
    pIfInfo = (WLAN_INTERFACE_INFO *) & pIfList->InterfaceInfo[i];    
    if (pIfInfo->isState == wlan_interface_state_connected) 
    {
        pIfConnInfo = pIfInfo;
        break;
    }
}

if ( pIfConnInfo == NULL )
    return 0;

// Query the Interface
dwResult = WlanQueryInterface(hClient,&pIfConnInfo->InterfaceGuid,wlan_intf_opcode_current_connection,NULL,&connectInfoSize,(PVOID *) &pConnectInfo,&opCode);
if (dwResult != ERROR_SUCCESS) 
{    
    return 0;
}

// Scan the connected SSID
dwResult = WlanScan(hClient,&pIfConnInfo->InterfaceGuid,&pConnectInfo->wlanAssociationAttributes.dot11Ssid,NULL,NULL);
if (dwResult != ERROR_SUCCESS) 
{    
    return 0;
}

// Get the BSS Entry
dwResult = WlanGetNetworkBssList(hClient,&pIfConnInfo->InterfaceGuid,&pConnectInfo->wlanAssociationAttributes.dot11Ssid,dot11_BSS_type_infrastructure,TRUE,NULL,&pBssList);

if (dwResult != ERROR_SUCCESS) 
{    
    return 0;
}

// Get the RSSI value
pBssEntry=&pBssList->wlanBssEntries[0];
return pBssEntry->lRssi;
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wlanSignalQuality - RSSI. , RSSI:

Rssi Value Windows

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