请问:VC++ 和AO的问题

<P>  ipPropertySet.CreateInstance(CLSID_PropertySet);
  
  // configure the propertyset
  ipPropertySet->SetProperty(CComBSTR("SERVER"),    CComVariant("keylab012"));
  ipPropertySet->SetProperty(CComBSTR(L"INSTANCE"), CComVariant("esri_sde"));
  ipPropertySet->SetProperty(CComBSTR(L"DATABASE"), CComVariant("database"));
  ipPropertySet->SetProperty(CComBSTR(L"USER"),     CComVariant("sde"));
  ipPropertySet->SetProperty(CComBSTR(L"PASSWORD"), CComVariant("sde"));
  ipPropertySet->SetProperty(CComBSTR(L"VERSION"),  CComVariant("sde.default"));</P>
<P>  // open workspace</P>
<P>  IWorkspacePtr outWorkspace;
   IWorkspaceFactoryPtr ipWorkspaceFactory;
   ipWorkspaceFactory.CreateInstance(CLSID_SdeWorkspaceFactory);
   ipWorkspaceFactory->Open(ipPropertySet,0, ;outWorkspace);</P>
<P>以上程序中open函数不能初始化outWorkspace.请问原因!怎么从哪里能看到函数参数的意义!在arcobject developer help中并没有VC的帮助!
</P>

<P>那是少之又少的帮助呀！！有些参数的含义都没说清楚呀！</P>

在9.o已经有vc的帮助了