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hide show app from task bar

Posted on 2004-10-04
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Last Modified: 2010-04-05
Hi.
 Use this code to hide my application from task bar :

  ShowWindow(Application.Handle, SW_HIDE);

  SetWindowLong(Application.Handle, GWL_EXSTYLE,
          GetWindowLong(Application.Handle, GWL_EXSTYLE) or WS_EX_TOOLWINDOW);

  ShowWindow(Application.Handle, SW_SHOW);

but how can i restore task bar (to show my application on task bar).

This is second question:
I want when I minimize the application (from task bar) the main form stay normal (not minimized)
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Question by:nikola_mk
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3 Comments
 
LVL 17

Assisted Solution

by:mokule
mokule earned 50 total points
ID: 12220641
Hi,
I'm not sure whether I understand You

  ShowWindow(Application.Handle, SW_HIDE);

  SetWindowLong(Application.Handle, GWL_EXSTYLE,
          GetWindowLong(Application.Handle, GWL_EXSTYLE) and (not WS_EX_TOOLWINDOW));

  ShowWindow(Application.Handle, SW_SHOW);
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LVL 12

Assisted Solution

by:Ivanov_G
Ivanov_G earned 25 total points
ID: 12220761
1) ShowWindow(Application.Handle, SW_SHOW);

2) use Application.OnMinimize event
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LVL 6

Accepted Solution

by:
so3 earned 25 total points
ID: 12222036
On the first question to show/hide the application simply put the icon of the program to be shown near the clock in the taskbar and double click to show/hide the app.

On the second question you can use as Ivanov_G said the  Application.OnMinimize event or see the coment from my code to handle the minimize event.

Here is the code to do it.


unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs,ShellApi;

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
  private
      procedure WndProc(var Msg : TMessage); override;
    { Private declarations }
  public
    { Public declarations }
    IconNotifyData : TNotifyIconData;
    Procedure ShowHide;
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.WndProc(var Msg : TMessage);
var
   p : TPoint;
begin
  case Msg.Msg of
    WM_USER+1:
    case Msg.lParam of
      WM_RBUTTONUP: begin
        GetCursorPos(p);
      end;
      WM_LBUTTONUP: begin
         ShowHide;
      end;
    end;
  end;
  if (Msg.Msg = WM_SYSCOMMAND) and (Msg.wParam = SC_MINIMIZE) then begin
     ShowHide; //here you can do the stuff on your second question
    Msg.wParam := 0;
    Msg.lParam :=0;
  end;
  inherited;
end;

Procedure TForm1.ShowHide;
begin
  if form1.Showing then Form1.Hide
          else form1.Show;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
with IconNotifyData do begin
     hIcon :=Application.Icon.Handle;
     uCallbackMessage := WM_USER + 1;
     cbSize := sizeof(IconNotifyData);
     Wnd := Handle;
     uID := 100;
     uFlags := NIF_MESSAGE + NIF_ICON + NIF_TIP;
  end;
  StrPCopy(IconNotifyData.szTip, Form1.Caption);
  Shell_NotifyIcon(NIM_ADD, @IconNotifyData);
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
    Shell_NotifyIcon(NIM_DELETE, @IconNotifyData);
    Application.ProcessMessages;
end;

end.

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