请大家帮我分析一下，谢谢！
我的代码如下所示：
void CSerComDlg::OnComm()
{
    // TODO: Add your control notification handler code here
    VARIANT variant_inp;
    COleSafeArray safearray_inp;
    LONG len, k;
    BYTE rxdata[2048];
    CString strtemp;
    if(m_ctrlComm.GetCommEvent()==2)//事件2表示接收缓冲区内有字符
    {
        variant_inp = m_ctrlComm.GetInput();
        safearray_inp = variant_inp;
        len= safearray_inp.GetOneDimSize();
        
        for(k=0;k<len;k++)
            safearray_inp.GetElement(&k,rxdata+k);
        for(k=0;k<len;k++)
        {
            BYTE bt=*(char*)(rxdata+k);
            strtemp.Format("%c",bt);
            m_Neidanwendu+=strtemp;
            m_kk++;
            if(m_kk>=5)
            {
                //m_Neidanwendu = _T("");
                UpdateData(FALSE);
                int temp=atoi(m_Neidanwendu);
                temp=420-255/370*temp;
                CClientDC d1(this);
                CPen p1;
                p1.CreatePen(PS_SOLID,1,RGB(255,0,0));
                d1.SelectObject(&p1);
                d1.SetPixel(100,temp,RGB(255,0,0));
                      
                m_Neidanwendu=_T("");
               
                m_kk=0;
            }

        }
        

    }


 
}

什么意思