Delphi代码获取网卡物理地址三种方法

以下是我从MSDN中翻译过来的三个Delphi单元，调用任意一个单元中声明的API都可以获取网卡的物理地址，但三个单元中的API函数的有效环境和功能各有不同，我把说明附于代码的注释中。

unit Lmwksta;

interface
uses
Windows,SysUtils,Dialogs;

type
_WKSTA_TRANSPORT_INFO_0=packed record
     wkti0_quality_of_service:DWORD;
     wkti0_number_of_vcs:DWORD;
     wkti0_transport_name:PWideChar;{连接设备名称，这个名称是\DEVICE\NetBT_TcpIp……我也不知道如何理解，不过我们只想获取MAC地址就不必管它了！}
     wkti0_transport_address:PWideChar; //MAC地址
     wkti0_wan_ish:BOOL; //是否是广域网连接
end;
WKSTA_TRANSPORT_INFO_0=_WKSTA_TRANSPORT_INFO_0;
PWKSTA_TRANSPORT_INFO_0=^WKSTA_TRANSPORT_INFO_0;

const
NERR_Success=0;
MAX_PREFERRED_LENGTH=$FFFFFFFF;

//当本计算机有可用的网卡，且已经连接上网络时，调用本函数才能成功，否则获取不到任何信息
function NetWkstaTransportEnum(
            ServerName:PWideChar;//主机名称，传递nil时表示本机
            Level:DWORD;//传递0
            BufPtr:PPointer; {接受_WKSTA_TRANSPORT_INFO_0记录数组的缓冲区，有此函数自行分配，但使用完后要用下面定义的NetApiBufferFree函数释放内存}
            PrefMaxLen:DWORD;//缓冲区最大长度，传递上面定义的MAX_PREFERRED_LENGTH常量即可
            EntriesRead,TotalEntries,ResumeHandle:PDWORD):DWORD;stdcall;
           {EntriesRead为返回的_WKSTA_TRANSPORT_INFO_0记录数组的元素个数,至于TotalEntries和ResumeHandle，可以传递nil，需要更深入的了解，请参见MSDN}
function NetApiBufferFree(Buffer:Pointer):DWORD;stdcall;

implementation
function NetWkstaTransportEnum;external 'netapi32.dll' name 'NetWkstaTransportEnum';
function NetApiBufferFree;external 'netapi32.dll' name 'NetApiBufferFree';

end.

unit Rpcdce;

interface
uses
Windows,SysUtils;

type
TUUID=packed record
     Data1:ULONG;
     Data2:Word;
     Data3:Word;
     Data4:array [0..7] of Byte;//此数组的后6个元素就是网卡的物理地址信息
end;
TGUID=TUUID;
PUUID=^TUUID;

const
{以下为UuidCreateSequential函数的可能返回值}
RPC_S_UUID_LOCAL_ONLY:LongInt=1824; //函数生成的GUID只能保证在本计算机上是唯一的
RPC_S_UUID_NO_ADDRESS:LongInt=1739; //不能获取以太网或令牌环网网卡设备
RPC_S_OK:LongInt=0; //函数调用成功，生成的GUID中包含了网卡的物理地址信息

function UuidCreateSequential(var uuid:TUUID):Cardinal;stdcall; //此函数只使用于单网卡的机器
function GetMACAddress:string;

implementation

function UuidCreateSequential;external 'Rpcrt4.dll' name 'UuidCreateSequential';

//引用此单元后，只需要调用GetMACAddress函数即可获得网卡物理地址
function GetMACAddress:string;
var
uuid:TUUID;
I:Integer;
begin
Result:='';
if UuidCreateSequential(uuid)=RPC_S_OK then
for I:=2 to 7 do
begin
    if I>2 then Result:=Result+'-';
     Result:=Result+IntToHex(uuid.Data4[I],2);
end;
end;

end.

unit IPHlpAPI;

interface
uses
Windows,SysUtils,Classes;

const
MAX_ADAPTER_DESCRIPTION_LENGTH=128;
MAX_ADAPTER_NAME_LENGTH=256;
MAX_ADAPTER_ADDRESS_LENGTH=8;
DEFAULT_MINIMUM_ENTITIES=32;
MAX_HOSTNAME_LEN=128;
MAX_DOMAIN_NAME_LEN=128;
MAX_SCOPE_ID_LEN=256;

ERROR_NO_DATA:LongInt=232;
ERROR_NOT_SUPPORTED:LongInt=50;
ERROR_INVALID_PARAMETER:LongInt=87;
ERROR_BUFFER_OVERFLOW:LongInt=111;
type
time_t=Integer;
IP_ADDRESS_STRING=packed record
     Addr:array [0..15] of Char;
end;
PIP_ADDRESS_STRING=^IP_ADDRESS_STRING;
IP_MASK_STRING=IP_ADDRESS_STRING;
PIP_MASK_STRING=^IP_MASK_STRING;
PIPAdapterInfo=^TIPAdapterInfo;
TIPAdapterInfo=packed record
     Next:PIPAdapterInfo;//下一个节点的指针
     ComboIndex:DWORD;
     AdapterName:array [0..MAX_ADAPTER_NAME_LENGTH + 3] of Char; //适配器名称
     Description:array [0..MAX_ADAPTER_DESCRIPTION_LENGTH + 3] of Char; //适配器描述信息
     AddressLength:UINT;//Address域的最大长度,传递MAX_ADAPTER_ADDRESS_LENGTH常量即可
     Address:array [0..MAX_ADAPTER_ADDRESS_LENGTH-1] of Byte;//适配器物理地址
     Index:DWORD;
     uType:UINT;
     DhcpEnabled:UINT;
     CurrentIpAddress:PIP_ADDRESS_STRING;
     IpAddressList:IP_ADDRESS_STRING;
     GatewayList:IP_ADDRESS_STRING;
     DhcpServer:IP_ADDRESS_STRING;
     HaveWins:BOOL;
     PrimaryWinsServer:IP_ADDRESS_STRING;
     SecondaryWinsServer:IP_ADDRESS_STRING;
     LeaseObtained:time_t;
     LeaseExpires:time_t;
end;

//此函数功能最强大，而且只要求网卡在系统中可用，并不要求一定连接上网络
function GetAdaptersInfo(Buf:PIPAdapterInfo;var BufLen:ULONG):DWORD;stdcall;

implementation

function GetAdaptersInfo;external 'iphlpapi.dll' name 'GetAdaptersInfo';

end.

对于GetAdaptersInfo函数，Buf参数要求函数的调用者自行分配，如果分配的空间不足，函数返回ERROR_BUFFER_OVERFLOW，BufLen变参的值被设置为实际需要的缓冲区大小，因此可以再行分配，以满足需

求,采用链表遍历操作可以获取所有已安装网卡的物理地址。
本文来自Delphi之窗，原文地址：http://www.52delphi.com