Пример написания FileListBox

1)WinAPI

{uses ShellApi}
procedure TForm1.ListBox1DblClick(Sender: TObject);
var s:string;
begin
s:=listbox1.Items[SendMessage(ListBox1.Handle,lb_GetCurSel,0,0)];
if edit1.Text[length(edit1.text)]<>'\' then edit1.text:=concat(edit1.text+'\');
if (not FileExists(edit1.text+s)) and (s[1]='[')and(s[length(s)]=']') then
DlgDirList( handle,
PChar(edit1.text+copy(s,2,length(s)-2)),
ListBox1.Handle,
Edit1.Handle,
faAnyFile
 );
if edit1.Text[length(edit1.text)]<>'\' then edit1.text:=concat(edit1.text+'\');
if FileExists(edit1.text+s) then
begin
caption:=edit1.text+s;
ShellExecute(handle,'open',PChar(edit1.text+s),'','c:\',sw_show);
end
end;
procedure TForm1.FormShow(Sender: TObject);
begin
edit1.Width:=1024*8-1;
edit1.Visible:=false;
DlgDirList(handle,
PChar('c:\'),
ListBox1.Handle,
Edit1.Handle,
faAnyFile
);
listbox1.Sorted:=false;
listbox1.Sorted:=true;
end;

2)

{uses ShellAPI}
type PListBox=^TListBox;
Procedure FillList(List:PListBox;pathh,mask:string;attr:Cardinal);
var path:string;
ser:TSearchRec;
begin
path:=pathh;
if path[length(path)]<>'\' then path:=path+'\';
List^.Items.Clear;
if FindFirst(path+mask,attr,ser)<>0 then exit;
List^.Items.Add(ser.Name);
while FindNext(ser)=0 do
begin
if ser.Attr and faDirectory=faDirectory then 
List^.Items.Add(' ['+Ser.Name+']')
else 
List^.Items.Add(Ser.Name);
end;
List^.Sorted:=false;
list^.Sorted:=true;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
FillList(@ListBox1,edit1.text,'*.*',faAnyFile);
end;
procedure TForm1.ListBox1DblClick(Sender: TObject);
var s:string;
begin
s:=ListBox1.Items[SendMessage(ListBox1.Handle,lb_GetCurSel,0,0)];
if (not FileExists(edit1.text+s)) and (s[1]+s[2]=' [') and (s[length(s)]=']') then
begin
FillList(@ListBox1,edit1.text+copy(s,3,length(s)-3),'*.*',faAnyFile);
edit1.text:=edit1.text+copy(s,3,length(s)-3)+'\';
end;
if FileExists(edit1.text+s) then 
ShellExecute(handle,'open',PChar(edit1.text+s),'','c:\',sw_show);
end;
 

Добавим иконки:

{uses ShellAPI}
type PListBox=^TListBox;
 
Procedure FillList(List:PListBox;pathh,mask:string;attr:Cardinal);
var path:string;
ser:TSearchRec;
begin
path:=pathh;
if path[length(path)]<>'\' then path:=path+'\';
List^.Items.Clear;
if FindFirst(path+mask,attr,ser)<>0 then exit;
List^.Items.Add(ser.Name);
while FindNext(ser)=0 do
begin
if ser.Attr and faDirectory=faDirectory then 
  List^.Items.Add(' ['+Ser.Name+']')
else 
  List^.Items.Add(Ser.Name);
end;
List^.Sorted:=false;
list^.Sorted:=true;
end;
 
 
procedure TForm1.FormCreate(Sender: TObject);
begin
  FillList(@ListBox1,edit1.text,'*.*',faAnyFile);
  listbox1.itemheight:=18;
end;
 
procedure TForm1.ListBox1DblClick(Sender: TObject);
var s:string;
  Icon:hIcon;
  IconIndex:word;
begin
IconIndex:=1;
s:=ListBox1.Items[SendMessage(ListBox1.Handle,lb_GetCurSel,0,0)];
if (not FileExists(edit1.text+s)) and (s[1]+s[2]=' [') and (s[length(s)]=']') then
begin
  FillList(@ListBox1,edit1.text+copy(s,3,length(s)-3),'*.*',faAnyFile);
  edit1.text:=edit1.text+copy(s,3,length(s)-3)+'\';
end;
if FileExists(edit1.text+s) then 
ShellExecute(handle,'open',PChar(edit1.text+s),'','c:\',sw_show);
end;
 
procedure TForm1.Button1Click(Sender: TObject);
var a:array of integer;
i:integer;
begin
SetLength(a,ListBox1.Items.Count+1);
//ZeroMemory(@a,ListBox1.Items.Count*4);
for i:=0 to ListBox1.Items.Count+1 do
a[i]:=10;
beep;
beep;
beep;
beep;
beep;
SendMessage(ListBox1.Handle,lb_SetTabStops,ListBox1.Items.Count,Integer(@a));
end;
 
procedure TForm1.ListBox1DrawItem(Control: TWinControl; Index: Integer;
Rect: TRect; State: TOwnerDrawState);
var icon:hIcon;
iconindex:word;
bm:TBitmap;
begin
iconindex:=1;
bm:=TBitmap.create;
bm.Width:=34;
bm.Height:=34;
ListBox1.Canvas.TextOut(17+Rect.Left,Rect.Top,ListBox1.Items[index]);
if (copy(ListBox1.Items[index],1,2)=' [') and 
   (not FileExists(edit1.text+ListBox1.Items[Index])) then
begin
Icon := ExtractAssociatedIcon(HInstance,
PChar(edit1.text+copy(ListBox1.Items[Index],3,length(ListBox1.Items[Index])-3)),
IconIndex);
DrawIcon(bm.Canvas.Handle, 0, 0, Icon);
bm.Canvas.StretchDraw(classes.rect(0,0,16,16),bm);
ListBox1.Canvas.CopyRect(classes.rect(0,rect.top,16,rect.top+16),bm.canvas,classes.rect(0,0,16,16));
end
else
begin
Icon := ExtractAssociatedIcon(HInstance,
PChar(edit1.text+ListBox1.Items[Index]),
IconIndex);
DrawIcon(bm.Canvas.Handle, 0, 0, Icon);
bm.Canvas.StretchDraw(classes.rect(0,0,16,16),bm);
ListBox1.Canvas.CopyRect(classes.rect(0,rect.top,16,rect.top+16),bm.canvas,classes.rect(0,0,16,16));
end;
bm.Free;
CloseHandle(Icon);
end;
 
procedure TForm1.ListBox1KeyDown(Sender: TObject; var Key: Word;
Shift: TShiftState);
begin
  ListBox1.Repaint;
end;
 
procedure TForm1.ListBox1MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
var k:word;
begin
  k:=0;
  Listbox1.OnKeyDown(sender,k,shift);
end;

Автор: Mikel

Взято с Vingrad.ru https://forum.vingrad.ru