liuip.pas

来自「delphi做的IP查询软件」· PAS 代码 · 共 104 行

unit liuIP;
//通过IP转换成地址
//需要IP数据库IP.dll
interface

uses sysutils,classes,windows,liustr;
  type
IPdat=record
startip,endip:int64;
adress:string[40];
end;
function IPToint(ip:string):int64;
function intToIP(i:int64):string;
function FindAdressFromIP(ip,datfile:string):string;

implementation
 function IPToint(ip:string):int64;
 var
 ss:array[0..3]of string;
 i:Integer;
 begin
     //222.81.51.114
     if liustr.StrShumu(ip,'.')=4then
     begin
       try
        liustr.fenjiestr(ip,'.',ss);
        result:=strtoint(ss[0]);
         for i:=1 to 3 do
         begin
             result:=(result shl 8)+strtoint(ss[i]);
         end;
         except

         result:=0;
         end;
     end
     else
     begin
        result:=0;
     end;
 end;
function intToIP(i:int64):string;
var
j1:int64;
begin

        j1:=i-((i shr 8)shl 8);
        result:='.'+inttostr(j1);
        i:=i shr 8;
        j1:=i-((i shr 8)shl 8);
        result:='.'+inttostr(j1)+result;
        i:=i shr 8;
        j1:=i-((i shr 8)shl 8);
        result:='.'+inttostr(j1)+result;
        i:=i shr 8;
        j1:=i-((i shr 8)shl 8);
        result:=inttostr(j1)+result;

end;
function FindAdressFromIP(ip,datfile:string):string;
var
fl:file of ipdat;
rd:ipdat;
b,e,i:integer;
fd:boolean;
l:int64;
begin

 result:='未知IP';
 if fileexists(datfile) then
 begin
 assignfile(fl,datfile);
 reset(fl);
 l:=iptoint(ip);
   b:=0;
   e:=filesize(fl);
   fd:=false;
   while not fd do
   begin
   i:=(e-b)div 2+b;
   seek(fl,i);
   read(fl,rd);
   if (l>=rd.startip)and(l<=rd.endip) then
   begin
      fd:=True;
      result:=rd.adress;
      break;
   end
   else if l<rd.startip then
   begin
      e:=i;
   end
   else
   begin
      b:=i;
   end;
   if l<=b then break;

   end;
 closefile(fl);
 end

end;
end.