Delphi例程读取无线连接的RSSI

Question

我想写一个简单的实用程序来定期记录我的WiFi路由器的RSSI到一个文本文件。有人知道Delphi库或API包装器读取无线路由器的RSSI值吗?

Answer 1

您可以使用本机wifi API获得您的活动网络wifi连接的RSSI，在调用WlanOpenHandle和WlanEnumInterfaces函数之后，您必须执行WlanQueryInterface方法传递wlan_intf_opcode_current_connection enum值和指向WLAN_CONNECTION_ATTRIBUTES结构的指针，从这里您必须访问wlanAssociationAttributes元素并最终读取wlanSignalQuality字段的值。

这个字段的描述。

wlanSignalQuality

A percentage value that represents the signal quality of the network. 

WLAN_SIGNAL_QUALITY的类型为ULONG。该成员包含取值范围在0到100之间。值为0表示实际RSSI信号强度- 100dbm。值为100表示实际的RSSI信号强度-50 dbm。您可以计算RSSI信号强度值对于wlanSignalQuality值在1和99之间使用线性插值。

试试这个示例代码

uses
  Windows,
  SysUtils,
  nduWlanAPI   in 'nduWlanAPI.pas',
  nduWlanTypes in 'nduWlanTypes.pas';
procedure Scan();
var
  hClient              : THandle;
  dwVersion            : DWORD;
  ResultInt            : DWORD;
  pInterface           : Pndu_WLAN_INTERFACE_INFO_LIST;
  i                    : Integer;
  pInterfaceGuid       : TGUID;
  pdwDataSize, RSSI    : DWORD;
  ppData               : pndu_WLAN_CONNECTION_ATTRIBUTES;
begin
  ResultInt:=WlanOpenHandle(1, nil, @dwVersion, @hClient);
 try
  if  ResultInt<> ERROR_SUCCESS then
  begin
     WriteLn('Error Open CLient'+IntToStr(ResultInt));
     Exit;
  end;
  ResultInt:=WlanEnumInterfaces(hClient, nil, @pInterface);
  if  ResultInt<> ERROR_SUCCESS then
  begin
     WriteLn('Error Enum Interfaces '+IntToStr(ResultInt));
     exit;
  end;
  for i := 0 to pInterface^.dwNumberOfItems - 1 do
  begin
    Writeln('Interface  ' + pInterface^.InterfaceInfo[i].strInterfaceDescription);
    WriteLn('GUID       ' + GUIDToString(pInterface^.InterfaceInfo[i].InterfaceGuid));
    pInterfaceGuid:= pInterface^.InterfaceInfo[pInterface^.dwIndex].InterfaceGuid;
    ppData:=nil;
    pdwDataSize:=0;
    ResultInt:=WlanQueryInterface(hClient, @pInterfaceGuid, wlan_intf_opcode_current_connection, nil, @pdwDataSize, @ppData,nil);
    try
      if (ResultInt=ERROR_SUCCESS) and (pdwDataSize=SizeOf(Tndu_WLAN_CONNECTION_ATTRIBUTES)) then
      begin
        Writeln(Format('Profile %s',[ppData^.strProfileName]));
        Writeln(Format('Mac Address %.2x:%.2x:%.2x:%.2x:%.2x:%.2x',[
        ppData^.wlanAssociationAttributes.dot11Bssid[0],
        ppData^.wlanAssociationAttributes.dot11Bssid[1],
        ppData^.wlanAssociationAttributes.dot11Bssid[2],
        ppData^.wlanAssociationAttributes.dot11Bssid[3],
        ppData^.wlanAssociationAttributes.dot11Bssid[4],
        ppData^.wlanAssociationAttributes.dot11Bssid[5]]));
        RSSI := (ppData^.wlanAssociationAttributes.wlanSignalQuality div 2) - 100;
        Writeln(Format('RSSI %d dbm',[RSSI]));
      end;
    finally
      if ppData<>nil then
       WlanFreeMemory(ppData);
    end;
  end;
 finally
  WlanCloseHandle(hClient, nil);
 end;
end;
begin
  try
    Scan();
  except
    on E:Exception do
      Writeln(E.Classname, ': ', E.Message);
  end;
  Readln;
end.

注意:不幸的是，AFAIK不存在官方的原生Wifi API头到Delphi的翻译，所以在此期间你可以使用这些