_StreamPtr使用求救.

Question

char xmlBuffer[1024];
_StreamPtr pStr;
if(FAILED(pStr.CreateInstance(__uuidof(Stream))))
pStr.Release(); hr = m_rs->Save(pStr.GetInterfacePtr(),adPersistXML);
_variant_t var   = pStr->ReadText(adReadAll); 
strcpy(xmlBuffer,var.bstrVal);//现在我需要反向操作,把xmlBuffer里的数据最终用_RecordsetPtr表示.
谁能告诉我,我尝试了没成功:
_StreamPtr pStream;
if(FAILED(pStream.CreateInstance(__uuidof(Stream))))
pStream.Release();
_bstr_t bt = str;
//下步异常
hr = pStream->WriteText(bt,adWriteChar);
        m_rs->Close();
hr = m_rs->Open(pStream.GetInterfacePtr(),vtMissing, adOpenForwardOnly,adLockReadOnly,adCmdFile); 

Answer 1

//将内存的XML读入_StreamPtr
_StreamPtr pStream;
HRESULT hr;
if(FAILED(pStream.CreateInstance(__uuidof(Stream))))
pStream.Release(); try{
variant_t vari(DISP_E_PARAMNOTFOUND,VT_ERROR);
pStream->PutType(adTypeText);
hr = pStream->Open(vari,adModeUnknown,   adOpenStreamUnspecified, _bstr_t(_T("")),   _bstr_t(_T(""))); _bstr_t bt = pwText;
hr = pStream->WriteText(bt,adWriteChar);
}catch(_com_error e)
{
MessageBox((char*)e.Description());
} try{
_RecordsetPtr  m_rs;

if(FAILED(m_rs.CreateInstance(__uuidof(Recordset))))
m_rs.Release();
pStream->Position = 0;
hr = m_rs->Open(pStream.GetInterfacePtr(),vtMissing, adOpenForwardOnly,adLockReadOnly,adCmdFile);