MFC tree controls load the Access database data

Research for several days, finally somehow, here is the code
[dlg.cpp]
In the initial function OnInitDialog () added
HICON hIcon [3];
HTREEITEM HRoot;
// load the three icons
hIcon [0] = theApp. LoadIconW (IDI_ICON1);
the hIcon [. 1] = theApp.LoadIconW (IDI_ICON3);
the hIcon [2] = theApp.LoadIconW (IDI_ICON2);

m_imageList.Create(16, 16, ILC_COLOR16, 3, 3);
for (int i=0;i<3;i++)
{
    m_imageList.Add(hIcon[i]);
}
//绑定树控件与ImaageList
m_webTree.SetImageList(&m_imageList, TVSIL_NORMAL);
//初始化Ado环境
AfxOleInit();
hRoot = NULL;
OpenConn();     //打开数据函数
LoadTreeCtrlData(hRoot,_T("0"));    //递归加数据到树控件中
CloseConn();        //关闭数据库

//下面就是递归函数
void CMFCApp_CTreeCtrl_testDlg::LoadTreeCtrlData(HTREEITEM hItem,CString mid)
{
HTREEITEM temItem;
_RecordsetPtr m_pRecordset;
m_pRecordset.CreateInstance(__uuidof(Recordset));
try
{
CString sql;
sql.Format(_T("select * from mTable where pID='%s'"), mid);

    m_pRecordset->Open((_variant_t)sql, m_pConnection.GetInterfacePtr(), adOpenDynamic, adLockOptimistic, adCmdText);
    //AfxMessageBox(_T("123"));
}
catch (_com_error e)
{
    CString str;
    str.Format(_T("连接数据表失败:%s"), e.ErrorMessage());
    AfxMessageBox(str);
    return;
}

_variant_t var;
CString strTmp;
while (!m_pRecordset->adoEOF)
{
    var = m_pRecordset->GetCollect(_T("mName"));
    strTmp = (LPCTSTR)_bstr_t(var);
    temItem=m_webTree.InsertItem(strTmp, 1, 1, hItem, TVI_LAST);
    
    //把自己的mID存入到节点中,

// node is stored in the data pointer address, check a few days before Baidu to find out.

    var = m_pRecordset->GetCollect(_T("mID"));
    strTmp = (LPCTSTR)_bstr_t(var);
    CString* pStr = new CString;
    *pStr = strTmp;
    m_webTree.SetItemData(temItem,(DWORD)pStr);

    //递归加载子节点
    LoadTreeCtrlData(temItem,strTmp);
    m_pRecordset->MoveNext();
}

}

// retrieve data

CString strText;
HTREEITEM hItem = m_webTree.GetSelectedItem();
//strText = m_webTree.GetItemText(hItem);
CString str = (CString)m_webTree.GetItemData(hItem);
if(str!=NULL)
strText.Format(_T("%s"), str->GetString());
SetDlgItemText(IDC_ITEM_SET_EDIT,strText);

Despite stumbling several days, I finally came up with effects.

MFC tree controls load the Access database data

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