Using OLE Automation

How do you get a specific Interface...

I have:

CLSIDFromProgID(OLESTR("BackWeb"),&CLSID_BackWeb);
Hr = CoCreateInstance(CLSID_BackWeb,NULL,CLSCTX_SERVER,IID_IDispatch,(void**)&pDisp);

I have tried:
IBackWeb* pIBackWeb;
pDisp->QueryInterface(IID_IBackWeb, (void **)&pIBackWeb);

The compiler complains that 'IBackWeb' : missing storage-class or type specifiers
and
'IID_IBackWeb' : undeclared identifier

Is there a way to get the IID for IID_IBackWeb?
bjstoreyAsked:
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sankar012898Commented:
Is that class Ur some custom object or is it a PREDEFINED one ?

Does the CoCreateInstance succeed ?
check HR Value .

Check if the object CLSID_BackWeb support a TYPELIBRARY interface
i.e. ITypeLib interface , ITypeInfo interface .

if it does  , check it there is a TLB file  for that
DLL . To get the DLL path , search for the CLSID_BackWeb
in the Registry . Locate the object in the registry and
check if there is a TYPELIB entry .  Use the TLB file .

If there is a TLB file , goto OLE/COM Viewer see the
object there .

If there is no explicit TLB file for the DLL ,  and if
the  DLL Supports  TypeLibrary interface then
do a  
         #IMPORT  "DLLPATH"

to generate the requred header TLH/TLI files  .
See  the  IID of  IID_IBackWeb there .

sankar














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