rkjx's Blog

获得网卡的MAC地址在很多地方都有很大的用处,下面的函数以XX-XX-XX-XX-XX-XX 的格式返回远程或本地机器的MAC地址。

Function to return the MAC address of a remote or local machine in the format XX-XX-XX-XX-XX-XX

返回的MAC地址是一个能用在多个方面的唯一标识。使用方法：
ShowMessage(GetMacAddress(\\MHEYDON);
输出00-02-08-E7-99-6B

// ======================================================================
//返回值是主机AServerName的MAC地址
//AServerName参数的格式为\\ServerName 或者 ServerName
//参数ServerName为空时返回本机的MAC地址
//MAC地址以XX-XX-XX-XX-XX-XX的格式返回
// ======================================================================

function GetMacAddress(const AServerName : string) : string;
type
     TNetTransportEnum = function(pszServer : PWideChar;
                                  Level : DWORD;
                                  var pbBuffer : pointer;
                                  PrefMaxLen : LongInt;
                                  var EntriesRead : DWORD;
                                  var TotalEntries : DWORD;
                                  var ResumeHandle : DWORD) : DWORD; stdcall;

     TNetApiBufferFree = function(Buffer : pointer) : DWORD; stdcall;

     PTransportInfo = ^TTransportInfo;
     TTransportInfo = record
                       quality_of_service : DWORD;
                       number_of_vcs : DWORD;
                       transport_name : PWChar;
                       transport_address : PWChar;
                       wan_ish : boolean;
                     end;

var E,ResumeHandle,
    EntriesRead,
    TotalEntries : DWORD;
    FLibHandle : THandle;
    sMachineName,
    sMacAddr,
    Retvar : string;
    pBuffer : pointer;
    pInfo : PTransportInfo;
    FNetTransportEnum : TNetTransportEnum;
    FNetApiBufferFree : TNetApiBufferFree;
    pszServer : array[0..128] of WideChar;
    i,ii,iIdx : integer;
begin
  sMachineName := trim(AServerName);
  Retvar := 00-00-00-00-00-00;

  // Add leading \\ if missing
  if (sMachineName <> ) and (length(sMachineName) >= 2) then begin
    if copy(sMachineName,1,2) <> \\ then
      sMachineName := \\ + sMachineName
  end;

  // Setup and load from DLL
  pBuffer := nil;
  ResumeHandle := 0;
  FLibHandle := LoadLibrary(NETAPI32.DLL);

  // Execute the external function
  if FLibHandle <> 0 then begin
    @FNetTransportEnum := GetProcAddress(FLibHandle,NetWkstaTransportEnum);
    @FNetApiBufferFree := GetProcAddress(FLibHandle,NetApiBufferFree);
    E := FNetTransportEnum(StringToWideChar(sMachineName,pszServer,129),0,
                           pBuffer,-1,EntriesRead,TotalEntries,Resumehandle);

    if E = 0 then begin
      pInfo := pBuffer;

      // Enumerate all protocols - look for TCPIP
      for i := 1 to EntriesRead do begin
        if pos(TCPIP,UpperCase(pInfo^.transport_name)) <> 0 then begin
          // Got It - now format result xx-xx-xx-xx-xx-xx
          iIdx := 1;
          sMacAddr := pInfo^.transport_address;

          for ii := 1 to 12 do begin
            Retvar[iIdx] := sMacAddr[ii];
            inc(iIdx);
            if iIdx in [3,6,9,12,15] then inc(iIdx);
          end;
        end;

        inc(pInfo);
      end;
      if pBuffer <> nil then FNetApiBufferFree(pBuffer);
    end;

    try
      FreeLibrary(FLibHandle);
    except
      // 错误处理
    end;
  end;
  result:=Retvar;
end;

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