我是一个菜鸟，我用以下的程序实现一个通迅的指示动画，但动画只运行10分钟左右就没了，但程序还在运行，请高手大侠们帮我分析看看，谢谢！

void CDisComState::OnTimer(UINT nIDEvent) 
{
    // TODO: Add your message handler code here and/or call default
    if(nIDEvent == 1)
    {
        picIndex++;
        picIndex = picIndex%5;
        CBitmap ComState;
        if(picIndex == 0x00)
            ComState.LoadBitmap(IDB_BITMAP2);
        else if(picIndex == 0x01)
            ComState.LoadBitmap(IDB_BITMAP3);
        else if(picIndex == 0x02)
            ComState.LoadBitmap(IDB_BITMAP4);
        else if(picIndex == 0x03)
            ComState.LoadBitmap(IDB_BITMAP5);
        else //if(picIndex == 0x04)
            ComState.LoadBitmap(IDB_BITMAP6);
        //m_nPicture.SetBitmap(ComState);         
        //GetDlgItem(IDC_DISCOM_PICTURE)->SetBitmap((HBITMAP)ComState);
        m_nPicture.SetBitmap((HBITMAP)ComState);
        ComState.Detach();
        CRect rect; 
        GetDlgItem(IDC_DISCOM_PICTURE)->GetWindowRect(&rect);
                    InvalidateRect(&rect);
        ComState.DeleteObject();
        
    }
    else if(nIDEvent == 2)
    {
        setDlg.m_nCom.SetOutput(COleVariant(setDlg.SerialDataBuf));
    }
    CDialog::OnTimer(nIDEvent);
}