procedure TForm1.Act_ConnetFTP;
var
FTPHost,FTPHostIP:String;
i:Integer;
begin
FTPHost:=Trim(Edit4.Text);
i:=Pos('//',FTPHost); //截取//以后的字符串
FTPHost:=Copy(FTPHost,i+2,Length(FTPHost)-i);
FTPHostIP:=GetHostIP(FTPHost);
if IdFTP1.Connected then IdFtp1.Disconnect;
IdFTP1.Host:=FTPHostIP;
IdFTP1.Port:=21;
IdFTP1.Username:=Edit2.Text;
IdFTP1.Password:=Edit3.Text;
IdFTP1.Connect;

if not IdFTP1.Connected then
showmessage('连接失败');
end;