我正试图在Windows 7机器上使用c ++获得连接的wifi信号的强度。
我可以使用命令WlanGetAvailableNetworkList
获取信号强度的值,但返回的值不够精确,不能满足我们的要求。基本上当你离开Wifi路由器时,值会以20%的增量跳跃(99% - > 80% - > 60%等)。
对于我们正在开发的应用程序,我们确实需要更准确的值。我知道这是可能的,因为我在Windows中看到应用程序显示信号强度的精确dBm值...
如果有人有任何建议,我们将不胜感激!
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);
}
}
答案 0 :(得分:5)
在网上继续研究之后,我设法修补了一种对我有用的方法。根据我的阅读 - 有许多不同的方法可以获得RSSI - 但这种方法虽然有点麻烦,但对我们的需求很有效...
我正在使用命令WlanGetNetworkBssList,然后直接从返回的PWLAN_BSS_ENTRY获取RSSI值。
我发现每次在查询WlanGetNetworkBssList之前调用WlanScan很重要,否则返回的值不会随着任何规律性而改变。
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;
答案 1 :(得分:1)
wlanSignalQuality是RSSI的插值。看看这个答案问题,了解如何直接获取RSSI: