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ANDLE 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;