Fenster im im Vordergrund bringen.

[mschaefer]

Moin, moin,

eignetlich sollte ich nicht mehr vor der Kiste sitzen,
aber nun bin ich doch tatsächlich wieder in der DP
gestrandet. Na denn man tau:

Notwendig sind zwei Schritte
1. das Handle bekommen und
2. das Fenster in den Vordergrund holen.
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1 Sucht nach dem entsprechenden Fensterhandle
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{
Beispiel, wie man ein Fenster "notepad" findet
und es anschliessend maximiert.
}

Delphi-Quellcode:

procedure TForm1.Button1Click(Sender: TObject);
var
  h: hwnd;
begin
  h := FindWindowByTitle('notepad');
  if h <> 0 then // if we found notepad
    ShowWindow(h, SW_MAXIMIZE)
  else
    ShowMessage('not found.');
end;

{ Holt das Handle aufgrund des Namensanteils }

Delphi-Quellcode:

function FindWindowByTitle(WindowTitle: string): Hwnd;
var
  NextHandle: Hwnd;
  NextTitle: array[0..260] of char;
begin
  // Get the first window
  NextHandle := GetWindow(Application.Handle, GW_HWNDFIRST);
  while NextHandle > 0 do
  begin
    // retrieve its text
    GetWindowText(NextHandle, NextTitle, 255);
    if Pos(WindowTitle, StrPas(NextTitle)) <> 0 then
    begin
      Result := NextHandle;
      Exit;
    end
    else
      // Get the next window
      NextHandle := GetWindow(NextHandle, GW_HWNDNEXT);
  end;
  Result := 0;
end;

2. Bringt das Fenster mit dem Handle in den Fordergrund
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Delphi-Quellcode:

function ForceForegroundWindow(hwnd: THandle): Boolean; 
const 
  SPI_GETFOREGROUNDLOCKTIMEOUT = $2000; 
  SPI_SETFOREGROUNDLOCKTIMEOUT = $2001; 
var 
  ForegroundThreadID: DWORD; 
  ThisThreadID: DWORD; 
  timeout: DWORD; 
begin 
  if IsIconic(hwnd) then ShowWindow(hwnd, SW_RESTORE); 


  if GetForegroundWindow = hwnd then Result := True 
  else 
  begin 
    // Windows 98/2000 doesn't want to foreground a window when some other 
    // window has keyboard focus 

    if ((Win32Platform = VER_PLATFORM_WIN32_NT) and (Win32MajorVersion > 4)) or 
      ((Win32Platform = VER_PLATFORM_WIN32_WINDOWS) and 
      ((Win32MajorVersion > 4) or ((Win32MajorVersion = 4) and 
      (Win32MinorVersion > 0)))) then 
    begin 
      // Code from Karl E. Peterson, [url]www.mvps.org/vb/sample.htm[/url] 
      // Converted to Delphi by Ray Lischner 
      // Published in The Delphi Magazine 55, page 16 

      Result := False; 
      ForegroundThreadID := GetWindowThreadProcessID(GetForegroundWindow, nil); 
      ThisThreadID := GetWindowThreadPRocessId(hwnd, nil); 
      if AttachThreadInput(ThisThreadID, ForegroundThreadID, True) then 
      begin 
        BringWindowToTop(hwnd); // IE 5.5 related hack 
        SetForegroundWindow(hwnd); 
        AttachThreadInput(ThisThreadID, ForegroundThreadID, False); 
        Result := (GetForegroundWindow = hwnd); 
      end; 
      if not Result then 
      begin 
        // Code by Daniel P. Stasinski 
        SystemParametersInfo(SPI_GETFOREGROUNDLOCKTIMEOUT, 0, @timeout, 0); 
        SystemParametersInfo(SPI_SETFOREGROUNDLOCKTIMEOUT, 0, TObject(0), 
          SPIF_SENDCHANGE); 
        BringWindowToTop(hwnd); // IE 5.5 related hack 
        SetForegroundWindow(hWnd); 
        SystemParametersInfo(SPI_SETFOREGROUNDLOCKTIMEOUT, 0, TObject(timeout), SPIF_SENDCHANGE); 
      end; 
    end 
    else 
    begin 
      BringWindowToTop(hwnd); // IE 5.5 related hack 
      SetForegroundWindow(hwnd); 
    end; 


    Result := (GetForegroundWindow = hwnd); 
  end; 
end; { ForceForegroundWindow }

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So das war es für mich heute ...
Grüße in den Westen // Martin