Mega Code Archive
How can I get a computers IP address
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Title: How can I get a computer's IP address ?
Question: How can I get a computer's IP address ?
Answer:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, Winsock;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
function DetectHostIP: Boolean;
end;
const
HostIP: String = 'Unknown';
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
begin
DetectHostIP;
end;
//Detect own TCP/IP address
function TForm1.DetectHostIP: Boolean;
var
wsdata : TWSAData;
hostName : array [0..255] of char;
hostEnt : PHostEnt;
addr : PChar;
begin
WSAStartup ($0101, wsdata);
try
gethostname (hostName, sizeof (hostName));
hostEnt := gethostbyname (hostName);
if Assigned (hostEnt) then
if Assigned (hostEnt^.h_addr_list) then begin
addr := hostEnt^.h_addr_list^;
if Assigned (addr) then begin
HostIP := Format ('%d.%d.%d.%d', [byte (addr [0]),
byte (addr [1]), byte (addr [2]), byte (addr [3])]);
Result := True;
end
else
Result := False;
end
else
Result := False
else begin
MessageDlg(Format ('Winsock error %d', [WSAGetLastError]), mtError, [mbOk], 0);
Result := False;
end;
finally
WSACleanup;
end
end;
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