100分，急向高手求教！关于Delphi的FTP编程问题！

function tftp.ex_download(remote_dir,local_dir:string):boolean;
var
    i,j,count1:integer;
    att,ss:string;
    current_dir:string;
    temp_dir:string;
begin
    try begin
        NMFTP1.ChangeDir(remote_dir);
        current_dir:=remote_dir;
        temp_dir:=copy(current_dir,2,length(current_dir));
        if not DirectoryExists(local_dir) then CreateDir(local_dir);
        if not directoryexists(local_dir+temp_dir) then createdir(local_dir+temp_dir);
        nmftp1.ParseList:=true;
        NMftp1.list;
        count1:=nmftp1.FTPDirectoryList.name.Count;
        for i:=0 to count1-1  do begin
            file://必须
            NMFTP1.ChangeDir(current_dir);
            nmftp1.list;
            ss:=nmftp1.FTPDirectoryList.name.Strings[i];
            att:=nmftp1.FTPDirectoryList.Attribute.Strings[i];
            if (copy(pchar(att),1,1)<>'d')and(copy(pchar(att),1,1)<>'D') then begin
                if not DirectoryExists(local_dir) then CreateDir(local_dir);
                NMFTP1.Download(current_dir+ss,local_dir+temp_dir+ss);
            end
            else begin
                if not directoryexists(local_dir+temp_dir+ss) then createdir(local_dir+temp_dir+ss);
                file://递归调用
                ex_download(remote_dir+ss+'\',local_dir);
            end;
        end;
           result:=true;
    end
    except
    On E:Exception do begin
        result:=false;
    end;
    end;
end;