Как обновить рабочий стол?

Материал из DRKB

Как обновить рабочий стол?[править | править код]

procedure RefreshDesktop;

var
  c1 : cardinal;
begin
  c1 := FindWindowEx(FindWindowEx(FindWindow('Progman', 'Program Manager'), 0, 'SHELLDLL_DefView', ''), 0, 'SysListView32', '');
  PostMessage(c1, WM_KEYDOWN, VK_F5, 0);
  PostMessage(c1, WM_KEYUP, VK_F5, 1 shl 31);
end;


Author: neutrino
Source: Взято с Vingrad.ru http://forum.vingrad.ru
ID: 01806



winexec(PChar('rundll32 user,repaintscreen' ), sw_Show);


Author: Radmin
Source: Взято с Vingrad.ru http://forum.vingrad.ru
ID: 01807



procedure TForm1.Button1Click(Sender: TObject); 
begin 
  SendMessage(FindWindow('Progman', 'Program Manager'), WM_COMMAND, $A065, 0); 
end;


Source: Взято из http://forum.sources.ru
ID: 01808



uses
  ShlObj;

procedure RefreshDesktop1;
begin
  SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, nil, nil);
end;


Source: Взято с сайта: http://www.swissdelphicenter.ch
ID: 01809



Обновить иконки на экране[править | править код]

Microsoft's Tweak UI has a feature 'rebuild icon cache now'. Windows then rebuilds its internal cache of icons. Unfortunately, there is no single API to do this.

uses
  Registry;

function RefreshScreenIcons: Boolean;
const
  KEY_TYPE = HKEY_CURRENT_USER;
  KEY_NAME = 'Control Panel\Desktop\WindowMetrics';
  KEY_VALUE = 'Shell Icon Size';
var
  Reg: TRegistry;
  strDataRet, strDataRet2: string;

procedure BroadcastChanges;
var
  success: DWORD;
begin
  SendMessageTimeout(HWND_BROADCAST,
                     WM_SETTINGCHANGE,
                     SPI_SETNONCLIENTMETRICS,
                     0,
                     SMTO_ABORTIFHUNG,
                     10000,
                     success);
end;


begin
  Result := False;
  Reg := TRegistry.Create;
  try
    Reg.RootKey := KEY_TYPE;
    // 1. open HKEY_CURRENT_USER\Control Panel\Desktop\WindowMetrics
    if Reg.OpenKey(KEY_NAME, False) then
    begin
      // 2. Get the value for that key
      strDataRet := Reg.ReadString(KEY_VALUE);
      Reg.CloseKey;
      if strDataRet <> '' then
      begin
        // 3. Convert sDataRet to a number and subtract 1,
        //    convert back to a string, and write it to the registry
        strDataRet2 := IntToStr(StrToInt(strDataRet) - 1);
        if Reg.OpenKey(KEY_NAME, False) then
        begin
          Reg.WriteString(KEY_VALUE, strDataRet2);
          Reg.CloseKey;
          // 4. because the registry was changed, broadcast
          //    the fact passing SPI_SETNONCLIENTMETRICS,
          //    with a timeout of 10000 milliseconds (10 seconds)
          BroadcastChanges;
          // 5. the desktop will have refreshed with the
          //    new (shrunken) icon size. Now restore things
          //    back to the correct settings by again writing
          //    to the registry and posing another message.
          if Reg.OpenKey(KEY_NAME, False) then
          begin
            Reg.WriteString(KEY_VALUE, strDataRet);
            Reg.CloseKey;
            // 6.  broadcast the change again
            BroadcastChanges;
            Result := True;
          end;
        end;
      end;
    end;
  finally
    Reg.Free;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  RefreshScreenIcons;
end;

The result is Window's erasing all its icons, and recalculating them based on the registry settings. This means if you have changed a DefaultIcon key within the registry for some application or file, Windows will display the new icon when the refresh is completed.

Original source: www.mvps.org/vbnet/index.html?code/reg/screenrefresh.htm

Translated from VB by Thomas Stutz


Language: en
Source: Взято с сайта: http://www.swissdelphicenter.ch
ID: 01810