关于ATL在vb下访问数据库的问题

[tccqs]

STDMETHODIMP Catl9::get_Enc(BSTR *pVal)
{
	*pVal = SysAllocStringByteLen(NULL,m_nSize);
	memcpy(*pVal, m_szData, m_nSize);
	
	return S_OK;
}

STDMETHODIMP Catl9::put_Enc(BSTR newVal)
{	
	char * cc=_com_util::ConvertBSTRToString(newVal);

	//BSTR bstrText = ::SysAllocString(L"你好are啊");
	//int nLen = ::SysStringLen(newVal); 
    m_nSize = strlen(cc);
	memset(m_szData, 0, m_nSize);
	//memcpy(m_szData, newVal, nLen);
	strcpy(m_szData,cc);
	
	return S_OK;
}

以上为ATL里的代码,为什么在get_Enc里加了
memcpy(*pVal, m_szData, m_nSize);在vb里调用时会出现:实时错误'6160'
如下为VB里的调用,,

             Do Until rst.EOF
                atl9.Enc = DGSrcRst.Columns(ListField.List(nListIndex)).Text
                DGSrcRst.Columns(ListField.List(nListIndex)).Text = atl9.Enc
               rst.MoveNext
             Loop

[hanjinchidm]

up

[CathySun118]

检查m_szData

[tccqs]

类里这样定义的:
char * m_szData[20]