原型为:
STDMETHODIMP CConvertDll::ConvertRtfToText(LPTSTR a_RtfText, LPTSTR a_Text)
其中a_RtfText为in,a_Text为out
STDMETHODIMP CConvertDll::ConvertRtfToText(LPTSTR a_RtfText, LPTSTR a_Text)
其中a_RtfText为in,a_Text为out
BSTR strResult = tmpStr.AllocSysString();
return strResult;
[out] only parameter must not derive from a top-level [unique] or [ptr]