emwin+ucos窗口刷不出来的解决办法？

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void Main_cb_BkWindow(WM_MESSAGE *pMsg){int Id;int NCode;static int Sel;switch(pMsg->MsgId){case WM_TIMER: Mainview_TimeEvent(pMsg); //TEXT_SetText(WM_GetDialogItem(hWin, TEXT_NOW),"123");// printf("nimenhaorn");     WM_RestartTimer(pMsg->Data.v,100); break;case WM_PAINT:GUI_DrawBitmap(&bmbackground,0,0);//GUI_SetBkColor(GUI_BLUE);//GUI_Clear();break;case WM_NOTIFY_PARENT:Id=WM_GetId(pMsg->hWinSrc);NCode=pMsg->Data.v;switch(Id){case MAIN_ICONVIEW://ICONVIEW0控件switch(NCode)//通知代码{case WM_NOTIFICATION_CLICKED:Sel=ICONVIEW_GetSel(pMsg->hWinSrc);switch(Sel){case 0://APP0call_MainTask();break;case 1://APP1Calculator_MainTask();break;case 2://APP2break;case 3://APP3break;case 4://APP4break;case 5://APP5break;case 6://APP6WM_HideWindow(WM_GetDialogItem(pMsg->hWin,MAIN_ICONVIEW));WM_HideWindow(WM_GetDialogItem(pMsg->hWin,MAIN_TEXT_INFO));WM_HideWindow(WM_GetDialogItem(pMsg->hWin,MAIN_TEXT_CALENDAR));WM_HideWindow(WM_GetDialogItem(pMsg->hWin,MAIN_TEXT_TIME));WM_HideWindow(WM_GetDialogItem(pMsg->hWin,MAIN_TEXT_CALL));WM_HideWindow(WM_GetDialogItem(pMsg->hWin,MAIN_TEXT_MSG));GUI_SetBkColor(GUI_BLUE); GUI_Clear();Music_MainTask();GUI_Delay(1000);WM_SetCallback(WM_HBKWIN,Main_cb_BkWindow);WM_ShowWindow(WM_GetDialogItem(pMsg->hWin,MAIN_ICONVIEW));WM_ShowWindow(WM_GetDialogItem(pMsg->hWin,MAIN_TEXT_INFO));WM_ShowWindow(WM_GetDialogItem(pMsg->hWin,MAIN_TEXT_CALENDAR));WM_ShowWindow(WM_GetDialogItem(pMsg->hWin,MAIN_TEXT_TIME));WM_ShowWindow(WM_GetDialogItem(pMsg->hWin,MAIN_TEXT_CALL));WM_ShowWindow(WM_GetDialogItem(pMsg->hWin,MAIN_TEXT_MSG));break;case 7://APP7break;case 8://APP8break;case 9://APP9break;}break;case WM_NOTIFICATION_RELEASED:break;case WM_NOTIFICATION_SEL_CHANGED:break;}break;}break;default:WM_DefaultProc(pMsg);break;}}void Music_MainTask(void) { OS_CPU_SR cpu_sr=0;    GUI_Init();music_new=mymalloc(SRAMEX,10);mymemset(music_new,0,10);if(!mp3){OS_ENTER_CRITICAL();//music_msg=OSMboxCreate((void*)0);     //创建消息邮箱    用于传输通信  UI->AUDIOPLAY  taskOSTaskCreate(music_task,(void *)0,(OS_STK *)&MUSIC_TASK_STK[MUSIC_STK_SIZE-1],MUSIC_TASK_PRIO );//OSTaskCreate(uart_task,(void *)0,(OS_STK*)&UART_TASK_STK[UART_STK_SIZE-1],UART_TASK_PRIO);OS_EXIT_CRITICAL();                          }else{audio_start();OSTaskResume(UART_TASK_PRIO);}//music_msg=OSMboxCreate((void*)0);mp3=true;//GUI_EnableAlpha(1);//    WM_SetDesktopColor(GUI_WHITE);      /* Automacally update desktop window */    WM_SetCreateFlags(WM_CF_MEMDEV);  /* Use memory devices on all windows to avoid flicker */    FRAMEWIN_SetDefaultSkin(FRAMEWIN_SKIN_FLEX);    PROGBAR_SetDefaultSkin(PROGBAR_SKIN_FLEX);    BUTTON_SetDefaultSkin(BUTTON_SKIN_FLEX);    SLIDER_SetDefaultSkin(SLIDER_SKIN_FLEX);OS_ENTER_CRITICAL();Win=GUI_CreateDialogBox(Music_aDialogCreate, GUI_COUNTOF(Music_aDialogCreate), &Music_cbCallback, 0, 0, 0);GUI_Exec();OS_EXIT_CRITICAL();flage=true;while(flage){GUI_Delay(500);}myfree(SRAMEX,music_new);return;}void print_task(void *pdata){WM8978_ADDA_Cfg(1,0);//开启DACWM8978_Input_Cfg(0,0,0);//关闭输入通道WM8978_Output_Cfg(1,0);//开启DAC输出 while(1){//Calculator_MainTask();//call_MainTask();//OSTimeDlyHMSM(0,0,0,5);//延时5ms//GUIDEMO_Skinning();//Music_MainTask();//Input_MainTask();//Sendmsg_MainTask(); //Read_msg_MainTask();Mainview_MainTask(0); //jpegshow("1:/测试用文件/示例图片.jpg");//TESTMainTask(); GUI_Delay(200);//mp3_play_song("1:/测试用文件/这条街.mp3");//mp3_play_song("1:/","测试用文件/这条街.mp3");//lrc_test("1:/测试用文件/","这条街.mp3");    //jpegdisplay_demo();}}

以上是三个函数的代码，有些乱，求谅解，其中从mainview_maintask()进去call_MainTask()，Calculator_MainTask()这两个窗口是正常的，就是把之前做好的music这个APP加载到这里上面就出问题。

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