This little sample program uses four TImage components to hold the icons to be used. The icons are changed from a timer.
Since you will not want to have the TImages visible on your screen, you should set their property Visible to false.
In Windows 95/ NT, the animation will appear on the tray as expected.
// This byte knows which icon is currently displayed
const
CurrentState : byte = 1;
procedure TForm1.Timer1Timer(Sender: TObject);
begin
if IsIconic(Application.Handle) then
begin
case CurrentState of
1: Application.Icon := Image1.Picture.Icon;
2: Application.Icon := Image2.Picture.Icon;
3: Application.Icon := Image3.Picture.Icon;
4: Application.Icon := Image4.Picture.Icon;
end; { case }
InvalidateRect(Application.Handle, nil, True); // critical!
if CurrentState >= 4 then
CurrentState := 1
else
inc(CurrentState);
end;
end;