delphi 获取IP地址以及全部TCPIP连接的掩码|笨鱼技术网

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;

except

end;

// Close sockets

CloseSocket(s);

WSACleanUp;

result := false;

end;

end.