common.pas

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unit Common;

interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls, StdCtrls, EDecode, winsock, WinInet;
function CheckHostToIP(sHost: string): string;
function CheckIsIpAddr(Name: string): Boolean;
implementation

function HostToIP(Name: string; var Ip: string): Boolean;
var
  wsdata: TWSAData;
  hostName: array[0..255] of char;
  hostEnt: PHostEnt;
  addr: PChar;
begin
  WSAStartup($0101, wsdata);
  try
    gethostname(hostName, sizeof(hostName));
    StrPCopy(hostName, Name);
    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
          Ip := 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
      Result := False;
    end;
  finally
    WSACleanup;
  end

end;

function CheckIsIpAddr(Name: string): Boolean;
var
  PStr: char;
  Temp: PChar;
  I: integer;
begin
  Result := True;
  if Length(Name) <= 15 then begin
    for I := 0 to Length(Name) do begin
      Temp := PChar(copy(Name, I, 1));
      PStr := Temp^;
      if not (PStr in ['0'..'9', '.']) then begin
        Result := False;
        break
      end;
    end;
  end else Result := False;
end;

function CheckHostToIP(sHost: string): string;
var
  sIpAddr: string;
begin
  if HostToIP(sHost, sIpAddr) then Result := sIpAddr
  else Result := '127.0.0.1';
end;

end.