在需要进入屏保的地方调用：

MApp_ZUI_ACT_StartupOSD(E_OSD_SCREEN_SAVER);

调用：

MApp_ZUI_ACT_AppShowScreenSaver();

通过：

for (wnd = 0; wnd < HWND_MAX; wnd++)

{

//printf("create msg: %lu\n", (U32)wnd);

MApp_ZUI_API_SendMessage(wnd, MSG_CREATE, 0);

}

再执行到：

iRet = MApp_ZUI_ACT_ExecuteWndProc(GETWNDPROCID(pMsg->hwnd), pMsg);

在判断：

g_GUI_WindowList[hwnd].u8WinProcID

时，有个Win的ProcID为EN_ZUI_SCREENSAVER_WINPROC

于是执行：

SCREENSAVER_WINPROC(msg->hwnd, msg);

此时msg的type为Create

执行的函数为：

case MSG_CREATE:

{

    if(hwnd == HWND_SCREEN_SAVER_FRAME)  这句话的意思是定义要显示的Page

    {

         U16 x, y;

         //MApi_GOP_GWIN_Enable(MApp_ZUI_API_QueryGWinID(), FALSE); //hide it first!

         srand(msAPI_Timer_GetTime0());

 

         {

              x = UI_OSD_PANE_W/2;

              y = UI_OSD_PANE_H/2;

         }

 

        _ss_move_x_positive_main = 1;

        _ss_move_y_positive_main = 1;

        if ((rand()%2) == 0)

             _ss_move_x_positive_main = 0;

        if ((rand()%2) == 0)

             _ss_move_y_positive_main = 0;

 

        main_rect.left = x;

        main_rect.top = y;

        main_rect.width = SCREEN_SAVER_FRAME_WIDTH;

        main_rect.height = SCREEN_SAVER_FRAME_HEIGHT;

        MApp_ZUI_API_MoveAllSuccessors(hwnd, main_rect.left, main_rect.top);

        MApp_ZUI_API_SetTimer(hwnd, 0, SCREEN_SAVER_MOVE_INTERVAL);

      }

}

  break;

 

至此，已经显示出第一幅画面，并已经通过：

MApp_ZUI_API_SetTimer(hwnd, 0, SCREEN_SAVER_MOVE_INTERVAL);

发送了Timer，就可以每隔SCREEN_SAVER_MOVE_INTERVAL这么多微秒更换一个画面了。