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uses IdHTTP;
procedure TForm1.Button1Click(Sender: TObject);
var s:string;
idhttp:Tidhttp;
begin
idhttp:=Tidhttp.Create(self);
try
s:=idhttp.Get('http://city.ip138.com/city0.asp');
showmessage(copy(s,pos('[',s)+1,pos(']',s)-pos('[',s)-1));
finally
idhttp.Free;
end;
end;