我正在尝试获取客户端计算机的mac地址,如果该计算机连接到Internet,则该计算机可以正常工作,但是一旦计算机断开与Internet的连接,Mac地址就会返回空白。
我知道为什么以及是否有任何可靠的功能可以使用,因为我从命令行运行的Windows getmac始终都会返回mac地址,而不管它是否已连接到Internet。
无论如何,我可以使用delphi调用getmac函数。
我用这个代码
function GetMACAdress: string;
var
NCB: PNCB;
Adapter: PAdapterStatus;
URetCode: PChar;
RetCode: char;
I: integer;
Lenum: PlanaEnum;
_SystemID: string;
TMPSTR: string;
begin
Result := '';
_SystemID := '';
Getmem(NCB, SizeOf(TNCB));
Fillchar(NCB^, SizeOf(TNCB), 0);
Getmem(Lenum, SizeOf(TLanaEnum));
Fillchar(Lenum^, SizeOf(TLanaEnum), 0);
Getmem(Adapter, SizeOf(TAdapterStatus));
Fillchar(Adapter^, SizeOf(TAdapterStatus), 0);
Lenum.Length := chr(0);
NCB.ncb_command := chr(NCBENUM);
NCB.ncb_buffer := Pointer(Lenum);
NCB.ncb_length := SizeOf(Lenum);
RetCode := Netbios(NCB);
i := 0;
repeat
Fillchar(NCB^, SizeOf(TNCB), 0);
Ncb.ncb_command := chr(NCBRESET);
Ncb.ncb_lana_num := lenum.lana[I];
RetCode := Netbios(Ncb);
Fillchar(NCB^, SizeOf(TNCB), 0);
Ncb.ncb_command := chr(NCBASTAT);
Ncb.ncb_lana_num := lenum.lana[I];
// Must be 16
Ncb.ncb_callname := '* ';
Ncb.ncb_buffer := Pointer(Adapter);
Ncb.ncb_length := SizeOf(TAdapterStatus);
RetCode := Netbios(Ncb);
//---- calc _systemId from mac-address[2-5] XOR mac-address[1]...
if (RetCode = chr(0)) or (RetCode = chr(6)) then
begin
_SystemId := IntToHex(Ord(Adapter.adapter_address[0]), 2) + '-' +
IntToHex(Ord(Adapter.adapter_address[1]), 2) + '-' +
IntToHex(Ord(Adapter.adapter_address[2]), 2) + '-' +
IntToHex(Ord(Adapter.adapter_address[3]), 2) + '-' +
IntToHex(Ord(Adapter.adapter_address[4]), 2) + '-' +
IntToHex(Ord(Adapter.adapter_address[5]), 2);
end;
Inc(i);
until (I >= Ord(Lenum.Length)) or (_SystemID <> '00-00-00-00-00-00');
FreeMem(NCB);
FreeMem(Adapter);
FreeMem(Lenum);
GetMacAdress := _SystemID;
end;
最佳答案
不要使用NetBios。改用GetAdaptersInfo()
或GetAdaptersAddresses()
。还请记住,一台计算机可能安装了多个网络适配器,因此具有多个可用的MAC地址。
关于delphi - 如果与Internet断开连接,则getmac地址返回空白,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/36023922/