Delph i判斷IP地址是否正確

function IsValidIP(strIP: string): Boolean;
var
  i, PartCount {用多少段,以點號分開}: Integer;
  Part: string;
begin
  PartCount := 0;
  while strIP <> '' do
  begin
    i := Pos('.', strIP);
    if i = 0 then
    begin
      Part := strIP;
      strIP := '';
    end
    else
    begin
      Part := Copy(strIP, 1, i - 1);
      Delete(strIP, 1, i);
    end;
    //IP分段必須是[0,255]的整數
    if not TryStrToInt(Part, i) or (i < 0) or (i > 255) then
    begin
      Result := False;
      Exit;
    end;
    Inc(PartCount);
  end;
  Result := PartCount = 4; //必須要有4段
end;