CoRevokeClassObject - OLE Programmer's Reference

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CoRevokeClassObject

Informs OLE that a class object, previously registered with the CoRegisterClassObject function, is no longer available for use.

HRESULT CoRevokeClassObject(

DWORD dwRegister	//Token on class object returned from call to CoRegisterClassObject
);

Parameter
dwRegister
Specifies the token previously returned from the CoRegisterClassObject function.

Return Values
S_OK

Indicates the class object was successfully revoked.

E_OUTOFMEMORY

Out of memory.

E_INVALIDARG

Indicates the dwRegister parameter does not map to a registered class object.

E_UNEXPECTED

Indicates an unexpected error occurred.

Comments
If a call to CoRevokeClassObject is successful, it means that the class object has been removed from the global class object table. However, if other clients still have pointers to the class object and have caused the reference count to be incremented by calls to IUnknown::AddRef, the reference count will not be zero. When this occurs, applications may benefit if subsequent calls (with the obvious exceptions of IUnknown::AddRef and IUnknown::Release) to the class object fail.

The object application must call CoRevokeClassObject to revoke registered class objects before exiting the program. Class object implementors should call CoRevokeClassObject as part of the release sequence. You must specifically revoke the class object even when you have specified the flags value REGCLS_SINGLEUSE in a call to CoRegisterClassObject, indicating that only one application can connect to the class object.

See Also
CoGetClassObject, CoRegisterClassObject

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