获得及设置本机的ip地址，子网掩码，网关，dns服务器信息

1、//取IP地址
function GetIP : string;
type
TaPInAddr = array [0..10] of PInAddr;
PaPInAddr = ^TaPInAddr;
var
phe : PHostEnt;
pptr : PaPInAddr;
Buffer : array [0..63] of char;
I : Integer;
GInitData : TWSADATA;
begin
WSAStartup($101, GInitData);
Result := '';
GetHostName(Buffer, SizeOf(Buffer));
phe :=GetHostByName(buffer);
if phe = nil then Exit;
pptr := PaPInAddr(Phe^.h_addr_list);
I := 0;
while pptr^[I] <> nil do begin
result:=StrPas(inet_ntoa(pptr^[I]^));
Inc(I);
end;
WSACleanup;
end;

2、获取路由、网关信息、网卡信息:
Procedure TForm1.Button1Click(Sender:TObject);
begin
Memo1.Lines.Clear;
if FileExists(Temp) then
DeleteFile(Temp);
WinExec(PChar('command.com /C route print >'+Temp),SW_HIDE);
while not FileExists(Temp) do
Sleep(1000)
Try
Memo1.Lines.LoadFromFile(Temp);
except
end;
end;

3、所有信息
function LocalIP:string;
type
TaPInAddr = array [0..10] of PInAddr;
PaPInAddr = ^TaPInAddr;
var
phe : PHostEnt;
pptr : PaPInAddr;
Buffer : array [0..63] of char;
I : Integer;
GInitData : TWSADATA;

begin
WSAStartup($101, GInitData);
Result := '';
GetHostName(Buffer, SizeOf(Buffer));
phe :=GetHostByName(buffer);
if phe = nil then Exit;
pptr := PaPInAddr(Phe^.h_addr_list);
I := 0;
while pptr^[I] <> nil do begin
result:=StrPas(inet_ntoa(pptr^[I]^));
Inc(I);
end;
WSACleanup;
end;

program get_ip;
uses
winsock,sysutils;
VAR
ch : ARRAY[1..32] OF Char;
i : Integer;
WSData: TWSAData;
MyHost: PHostEnt;
begin
IF WSAstartup(2,wsdata)<>0 THEN
BEGIN
Writeln('can''t start Winsock: Error ',WSAGetLastError);
Halt(2);
END;
try
IF getHostName(@ch[1],32)<>0 THEN
BEGIN
Writeln('getHostName failed');
Halt(3);
END;
except
Writeln('getHostName failed');
halt(3);
end;
MyHost:=GetHostByName(@ch[1]);
IF MyHost=NIL THEN
BEGIN
Writeln(GetHostName('+StrPas(@ch[1])+') failed : Error
'+IntToStr(WSAGetLastError));
Halt(4);
END
ELSE
BEGIN
Write('address ');
FOR i:=1 TO 4 DO
BEGIN
Write(Ord(MyHost.h_addr^[i-1]));
IF i<4 THEN
then write('.')
ELSE
writeln;
END;
END;
end.

4、获取路由、网关信息、网卡信息:
Procedure TForm1.Button1Click(Sender:TObject);
begin
Memo1.Lines.Clear;
if FileExists(Temp) then
DeleteFile(Temp);
WinExec(PChar('command.com /C route print >'+Temp),SW_HIDE);
while not FileExists(Temp) do
Sleep(1000)
Try
Memo1.Lines.LoadFromFile(Temp);
except
end;
end;

5、MAC代码:
procedure TForm1.Button1Click(Sender: TObject);
Var
NCB : TNCB;
ADAPTER : TADAPTERSTATUS;
LANAENUM : TLANAENUM;
intIdx : Integer;
re : Char;
buf : String;
begin
Try
{ ZeroMemory(@NCB, SizeOf(NCB));
NCB.ncb_command := Chr(NCBENUM);
re := NetBios(@NCB);

// Reissue enum command
NCB.ncb_buffer := @LANAENUM;
NCB.ncb_length := SizeOf(LANAENUM);
re := NetBios(@NCB);
If Ord(re)<>0 Then
exit;
}
{ Copyright (C) Bowman }
{ [e-mail] }
// Reset adapter
ZeroMemory(@NCB, SizeOf(NCB));
NCB.ncb_command := Chr(NCBRESET);
NCB.ncb_lana_num := LANAENUM.lana[0];//important
re := NetBios(@NCB);
If Ord(re)<>0 Then
exit;

// Get adapter address
ZeroMemory(@NCB, SizeOf(NCB));
NCB.ncb_command := Chr(NCBASTAT);
NCB.ncb_lana_num := LANAENUM.lana[0];////bowman
StrPCopy(NCB.ncb_callname, '*');
NCB.ncb_buffer := @ADAPTER;
NCB.ncb_length := SizeOf(ADAPTER);
re := NetBios(@NCB);
If Ord(re)<>0 Then
exit;

buf := '';
For intIdx := 0 To 5 Do
buf := buf + InttoHex(Integer(ADAPTER.adapter_address[intIdx]),2)+'-';
edit1.Text := copy(buf,0,length(buf)-1);
Finally
End;

end;

6、取子网隐码:
procedure TForm1.Button1Click(Sender: TObject);
var
reg:TRegistry;
re:boolean;
device:string;
buf:pchar;
mask:string;
adapter:string;
begin
reg:=TRegistry.Create();
try
Reg.RootKey := HKEY_LOCAL_MACHINE;
//open key
//win NT
//get bind device
re:=Reg.OpenKey('SYSTEM/CurrentControlSet/Services/Tcpip/Linkage',
false);

if re then
begin
getmem(buf,1024);
Reg.ReadBinaryData('Bind',buf^,1024);
device := strpas(buf);
freemem(buf);
end
else
begin
edit1.text:='Failed to get bind device';
reg.closekey();
reg.Free;
exit;
end;
reg.CloseKey;
//get adapter
adapter:=copy(device,2,length(device)-1);
showmessage(adapter);
adapter:=copy(adapter,POS('/',adapter)+1,length(adapter)-POS('/',adapter));
showmessage(adapter);
//query
re:=Reg.OpenKey('SYSTEM/CurrentControlSet/Services/'+
adapter+
'/Parameters/Tcpip',
false);
if re then
begin
getmem(buf,1024);
Reg.ReadBinaryData('SubnetMask',buf^,1024);
mask := strpas(buf);
freemem(buf);
end

else
mask:='Failed to get subnet mask';
finally
Reg.CloseKey;
Reg.Free;
end;
edit1.text:=device;
edit2.text:=mask;
end;

7、子网隐码WIn98下:
procedure TForm1.Button1Click(Sender: TObject);
var
reg:TRegistry;
re:boolean;
mask:string;
begin
reg:=TRegistry.Create();
try
Reg.RootKey := HKEY_LOCAL_MACHINE;
//open key
//win 9x
re:=Reg.OpenKey('System/CurrentControlSet/Services/Class/NetTrans/0000',
false);

if re then
begin
mask := Reg.Readstring('IPMask');
end
else
begin
edit1.text:='Failed to get mask';
reg.closekey();
reg.Free;
exit;
end;
finally
Reg.CloseKey;
Reg.Free;
end;
edit1.text:=mask;

end;

8、这一段获得主机名字，IP地址等的代码
===============================================
unit hostName;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, Winsock;

type
TForm1 = class(TForm)
Edit1: TEdit;
Label1: TLabel;
Label2: TLabel;
Edit2: TEdit;
Edit3: TEdit;
Label3: TLabel;
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
Ip:string;
Ipstr:string;
Buffer:Array[1..32] of char;
i:integer;
WSData:TWSAdata;
Host:PHostEnt;
begin
if WSAstartup(2,WSData)<>0 then
begin
ShowMessage('WS2_32.DLL初始化失败!');
halt;
end;
try
if GetHostName(@Buffer[1],32)<>0 then
begin
ShowMessage('没有得到主机名!');
halt;
end;
except
ShowMessage('没有成功返回主机名');
halt;
end;
Host := GetHostByName(@Buffer[1]);
if Host = nil then
begin
ShowMessage('IP地址为空');
halt;
end
else
begin
Edit2.Text := Host.h_name;
Edit3.Text := Chr(Host.h_addrtype+64);
for i:=1 to 4 do
begin
Ip:=IntToStr(Ord(Host.h_addr^[i-1]));
ShowMessage('分段IP地址为:'+Ip);
if i<4 then
Ipstr := Ipstr + Ip + '.'
else
Edit1.Text:=Ipstr+Ip;
end;
end;
WSACleanup;
end;
end.