CoGetTreatAsClass

Returns the CLSID of an object that can emulate the specified object.

HRESULT CoGetTreatAsClass(
  REFCLSID clsidOld,   //CLSID of object that is being emulated
  LPCLSID pclsidNew    //Pointer to CLSID for object that can 
                       // emulate clsidOld
);
 

Parameters

clsidOld

[in] CLSID of the object that can be emulated (treated as) an object with a different CLSID.

pclsidNew

[out] Pointer to where the CLSID that can emulate clsidOld objects is retrieved. This parameter cannot be NULL. If there is no emulation information for clsidOld objects, the clsidOld parameter is supplied.

Return Values

S_OK

A new CLSID was successfully returned.

S_FALSE

No emulation information for the clsidOld parameter and that the pclsidNew parameter is set to clsidOld.

REGDB_E_READREGDB

An error reading the registry.

This function can also return any of the error values returned by the CLSIDFromString function.

Remarks

CoGetTreatAsClass returns the TreatAs entry in the registry for the specified object. The TreatAs entry, if set, is the CLSID of a registered object (an application) that can emulate the object in question. The TreatAs entry is set through a call to the CoTreatAsClass function. Emulation allows an application to open and edit an object of a different format, while retaining the original format of the object. Objects of the original CLSID are activated and treated as objects of the second CLSID. When the object is saved, this may result in loss of edits not supported by the original format. If there is no TreatAs entry for the specfied object, this function returns the CLSID of the original object (clsidOld).

QuickInfo

  Windows NT: Use version 3.1 or later.
  Windows: Use Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in objbase.h.
  Import Library: Included as a resource in ole32.dll.

See Also

CoTreatAsClass