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获取IP地址以及全部TCPIP连接的掩码
问题提出/摘要:

我们有很多种方法获取一台计算机的IP地址，但这里才是“正确”的方法：列出所有的地址、网络掩码、广播地址和连接状态等，包括环回点 127.0.0.1。需要使用到WinSock2。

回答:

  这是一个完整的Delphi单元，将它加入到你的工程中，你可以调用：



  EnumInterfaces(var s string): Boolean;



  来返回所有IP地址、网络掩码、广播地址和连接状态。

  --------------------------------------------------------------------



  unit USock;



  interface



  uses Windows, Winsock;



  {



  此函数列举出所有的TCP/IP连接，并返回一个由回车换行(CRLF)符分隔的字符串，包含以下信息：



  IP, NetMask, BroadCast-Address, Up/Down status,

  Broadcast support, Loopback



  如果你将这个字符串赋给TMemo(它的Memo.Lines.Text属性)，你可以看到更清晰的结果。



  使用此函数，你需要Win98/ME/2K, 95 OSR 2 或者NT service pack #3，因为程序会使用到WinSock 2(WS2_32.DLL)。



  }



  function EnumInterfaces(var sInt: string): Boolean;



  { 从Winsock 2.0导入函数WSAIOCtl -- 在Win98/ME/2K and 95 OSR2, NT srv pack #3下才有Winsock 2 }



  function WSAIoctl(s: TSocket; cmd: DWORD; lpInBuffer: PCHAR; dwInBufferLen:

  DWORD;

  lpOutBuffer: PCHAR; dwOutBufferLen: DWORD;

  lpdwOutBytesReturned: LPDWORD;

  lpOverLapped: POINTER;

  lpOverLappedRoutine: POINTER): Integer; stdcall; external 'WS2_32.DLL';



  { Constants taken from C header files }



  const SIO_GET_INTERFACE_LIST = $4004747F;

  IFF_UP = $00000001;

  IFF_BROADCAST = $00000002;

  IFF_LOOPBACK = $00000004;

  IFF_POINTTOPOINT = $00000008;

  IFF_MULTICAST = $00000010;



  type sockaddr_gen = packed record

  AddressIn: sockaddr_in;

  filler: packed array[0..7] of char;

  end;



  type INTERFACE_INFO = packed record

  iiFlags: u_long; // Interface flags

  iiAddress: sockaddr_gen; // Interface address

  iiBroadcastAddress: sockaddr_gen; // Broadcast address

  iiNetmask: sockaddr_gen; // Network mask

  end;



  implementation



  {-------------------------------------------------------------------



  1. 打开Winsock

  2. 创建一个socket

  3. 调用WSAIOCtl获取网络连接

  4. 对每个连接，获取它的IP、掩码、广播地址、状态

  5. 将信息填充到一个由CDLF分隔的字符串中

  6. 结束



  --------------------------------------------------------------------}



  function EnumInterfaces(var sInt: string): Boolean;

  var s: TSocket;

  wsaD: WSADATA;

  NumInterfaces: Integer;

  BytesReturned, SetFlags: u_long;

  pAddrInet: SOCKADDR_IN;

  pAddrString: PCHAR;

  PtrA: pointer;

  Buffer: array[0..20] of INTERFACE_INFO;

  i: Integer;

  begin

  result := true; // Initialize

  sInt := '';



  WSAStartup($0101, wsaD); // Start WinSock

  // You should normally check

  // for errors here :)



  s := Socket(AF_INET, SOCK_STREAM, 0); // Open a socket

  if (s = INVALID_SOCKET) then exit;



  try // Call WSAIoCtl

  PtrA := @bytesReturned;

  if (WSAIoCtl(s, SIO_GET_INTERFACE_LIST, nil, 0, @Buffer, 1024, PtrA, nil,

  nil)

  <> SOCKET_ERROR)

  then

  begin // If ok, find out how

  // many interfaces exist



  NumInterfaces := BytesReturned div SizeOf(INTERFACE_INFO);



  for i := 0 to NumInterfaces - 1 do // For every interface

  begin

  pAddrInet := Buffer[i].iiAddress.addressIn; // IP ADDRESS

  pAddrString := inet_ntoa(pAddrInet.sin_addr);

  sInt := sInt + ' IP=' + pAddrString + ',';

  pAddrInet := Buffer[i].iiNetMask.addressIn; // SUBNET MASK

  pAddrString := inet_ntoa(pAddrInet.sin_addr);

  sInt := sInt + ' Mask=' + pAddrString + ',';

  pAddrInet := Buffer[i].iiBroadCastAddress.addressIn; // Broadcast addr

  pAddrString := inet_ntoa(pAddrInet.sin_addr);

  sInt := sInt + ' Broadcast=' + pAddrString + ',';



  SetFlags := Buffer[i].iiFlags;

  if (SetFlags and IFF_UP) = IFF_UP then

  sInt := sInt + ' Interface UP,' // Interface up/down

  else

  sInt := sInt + ' Interface DOWN,';



  if (SetFlags and IFF_BROADCAST) = IFF_BROADCAST then // Broadcasts

  sInt := sInt + ' Broadcasts supported,' // supported or

  else // not supported

  sInt := sInt + ' Broadcasts NOT supported,';



  if (SetFlags and IFF_LOOPBACK) = IFF_LOOPBACK then // Loopback or

  sInt := sInt + ' Loopback interface'

  else

  sInt := sInt + ' Network interface'; // normal



  sInt := sInt + #13#10; // CRLF between

  // each interface

  end;

  end;

  except

  end;

  //

  // Close sockets

  //

  CloseSocket(s);

  WSACleanUp;

  result := false;

  end;



  end.



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