Delphi 窗口置顶的方法

有几种窗口置顶的方法，简单的有：

ShowWindow(窗口句柄,sw_ShowNormal);
SetWindowPos(窗口句柄,HWND_NOTOPMOST,0,0,0,0,SWP_NOMOV OR SWP_NOSIZE OR SWP_SHOWWINDOW);

另一种方式是：

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);    // 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, www.mvps.org/vb/sample.htm         // 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;

 另外，主窗体有个置顶的属性FormStyle, 设置为fsStayOnTop就可以直接置顶了。