// ==================================================== =================
// traverse a certain file under a folder,
// Instructions for use
//       _GetFileList(ListBox1.Items,'c:\*.doc');
//           _GetFileList(MyTStringList,'c:\*.exe');
// ==================================================== =================
procedure TForm1._GetFileList(AStrings: TStrings ; ASourFile: string);
var sour_path,sour_file: string;
    TmpList:TStringList;
    FileRec: TSearchrec;
begin

   sour_path:=ExtractFilePath(ASourFile);
   sour_file:=ExtractFileName(ASourFile);

   if not DirectoryExists(sour_path) then
   begin
     AStrings.Clear;
     exit;
   end;

   TmpList:=TStringList.Create;
   TmpList.Clear;

   if FindFirst(sour_path+sour_file,faAnyfile,FileRec) = 0 then
   repeat
      if ((FileRec.Attr and faDirectory) = 0) then
         begin
           TmpList.Add(sour_path+FileRec.Name)
         end;
   until FindNext(FileRec)<>0;

   SysUtils.FindClose(FileRec);

   AStrings.Assign(TmpList);

   TmpList.Free;
end;

// ==================================================== =================
// traverse a certain folder and a certain file under a subfolder,
// Instructions for use
//       _GetFileList(ListBox1.Items, 'c:\', '*.doc');
//           _GetFileList(MyTStringList, 'c:\', '*.exe');
// ==================================================== =================
procedure _GetFileList(AStrings: TStrings; ASourFile,
  FileName: string);
var sour_path,sour_file: string;
    TmpList:TStringList;
    FileRec, subFileRec:TSearchrec;
    i: Integer;
begin
   if rightStr(trim(ASourFile), 1) <> '\' then
     sour_path :=trim(ASourFile) + '\'
   else
     sour_path :=trim(ASourFile);
   sour_file:= FileName;

   if not DirectoryExists(sour_path) then
   begin
     AStrings.Clear;
     exit;
   end;

   TmpList:=TStringList.Create;
   TmpList.Clear;

   if FindFirst(sour_path+'*. *', faAnyfile, FileRec) = 0 then
   repeat
      if ((FileRec.Attr and faDirectory) <> 0) then
         begin
           if ((FileRec.Name<> '.') and (FileRec.Name  <> '..')) then
             _GetFileList(AStrings, sour_path+ FileRec.Name + '\',  sour_file);
         end
      else
        if FindFirst(sour_path + FileName,faAnyfile,subFileRec) = 0 then
        repeat
          if ((subFileRec.Attr and faDirectory) = 0) then
            TmpList.Add(sour_path+subFileRec.Name);
        until FindNext(subFileRec)<>0;

   until FindNext(FileRec)<>0;

   FindClose (FileRec);
   for i := 0 to TmpList.Count -1 do
     AStrings.Add(TmpList.Strings[i]);

   TmpList.Free;
end;