Article #17784: How do I recurse sub directories?

 Question and Answer Database
FAQ2784D.txt How do I recurse sub directories?
Category :Object Pascal
Platform :All
Product :All 32 bit
Question:
How do I recurse sub directories?
Answer:
You will need to use Delphi's FindFirst() and FindNext()
procedures to create a list of all the sub directories
in a directory. For each sub directory, you will need to
use Delphi's FindFirst() and FindNext() procedures, again
to add any sub directories of the found directories to the
list. Continue working down the list until all the
directories have been processed.
Example:
procedure GetDirectories(const DirStr : string;
ListBox : TListBox);
var
DirInfo: TSearchRec;
r : Integer;
begin
r := FindFirst(DirStr + '\*.*', FaDirectory, DirInfo);
while r = 0 do begin
Application.ProcessMessages;
if ((DirInfo.Attr and FaDirectory = FaDirectory) and
(DirInfo.Name <> '.') and
(DirInfo.Name <> '..')) then
ListBox.Items.Add(DirStr + '\' + DirInfo.Name);
r := FindNext(DirInfo);
end;
SysUtils.FindClose(DirInfo);
end;
procedure GetFiles(const DirStr : string;
ListBox : TListBox);
var
DirInfo: TSearchRec;
r : Integer;
begin
r := FindFirst(DirStr + '\*.*', FaAnyfile, DirInfo);
while r = 0 do begin
Application.ProcessMessages;
if ((DirInfo.Attr and FaDirectory <> FaDirectory) and
(DirInfo.Attr and FaVolumeId <> FaVolumeID)) then
ListBox.Items.Add(DirStr + '\' + DirInfo.Name);
r := FindNext(DirInfo);
end;
SysUtils.FindClose(DirInfo);
end;
procedure TForm1.FormCreate(Sender: TObject);
var
i : integer;
begin
ListBox1.Items.Clear;
ListBox2.Items.Clear;
ListBox1.Items.Add('C:\Delphi');
GetDirectories('C:\Delphi', ListBox1);
i := 1;
while i < ListBox1.Items.Count do begin
GetDirectories(ListBox1.Items[i], ListBox1);
Inc(i);
end;
end;
procedure TForm1.ListBox1Click(Sender: TObject);
begin
ListBox2.Clear;
GetFiles(ListBox1.Items[ListBox1.ItemIndex],
ListBox2);
end;
Note: Recursing directories can take up a lot of memory.
It is suggested that you consider creating a linked list
or a temporary file to store your list entries instead
of using a component (such as a Memo or StringList), as
there are limits to the number of entries these components
can have.
7/16/98 4:31:28 PM

Last Modified: 01-SEP-99