我正在尝试在Windows 7计算机上使用c++获得连接的wifi信号的强度。
我可以使用 WlanGetAvailableNetworkList
命令获得信号强度的值,但是返回的值不够细致,无法满足我们的要求。基本上,当您离开Wifi路由器时,该值将以20%的增量跳跃(99%-> 80%-> 60%等)。
对于我们正在开发的应用程序,我们确实需要一个更准确的值。我知道这是有可能的,因为我已经看到窗口中的应用程序显示了准确的dBm信号强度值...
如果有人有任何建议,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);
}
}
最佳答案
好了,在继续在线研究之后,我设法拼凑出一种对我有用的方法。从我读过的书中-获得RSSI的方法有很多种-但是这种方法虽然有点麻烦,但可以很好地满足我们的需求...
我使用命令WlanGetNetworkBssList,然后直接从返回的PWLAN_BSS_ENTRY获取RSSI值。
我发现在查询WlanGetNetworkBssList之前每次都调用WlanScan很重要,否则返回的值不会以任何规律改变。
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;