IGlobalInterfaceTable::RegisterInterfaceInGlobal method (objidl.h)

Registers the specified interface on an object residing in one apartment of a process as a global interface, enabling other apartments access to that interface.


HRESULT RegisterInterfaceInGlobal(
  [in]  IUnknown *pUnk,
  [in]  REFIID   riid,
  [out] DWORD    *pdwCookie


[in] pUnk

An interface pointer of type riid on the object on which the interface to be registered as global is implemented.

[in] riid

The IID of the interface to be registered as global.

[out] pdwCookie

An identifier that can be used by another apartment to get access to a pointer to the interface being registered. The value of an invalid cookie is 0.

Return value

This method can return the following values.

Return code Description
The method completed successfully.
One or more parameters are invalid.


Called in the apartment in which an object resides to register one of the object's interfaces as a global interface. This method supplies a pointer to a cookie that other apartments can use in a call to the GetInterfaceFromGlobal method to get a pointer to that interface.

The interface pointer may be a pointer to an in-process object, or it may be a pointer to a proxy for an object residing in another apartment, in another process, or on another computer.

The apartment that calls this method must remain alive until the corresponding call to RevokeInterfaceFromGlobal.


Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps | UWP apps]
Minimum supported server Windows 2000 Server [desktop apps | UWP apps]
Target Platform Windows
Header objidl.h (include ObjIdl.h)

See also