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OleNoteObjectVisible function (ole2.h)

  • Article

Increments or decrements an external reference that keeps an object in the running state.

Syntax

HRESULT OleNoteObjectVisible(
  [in] LPUNKNOWN pUnknown,
  [in] BOOL      fVisible
);

Parameters

[in] pUnknown

Pointer to the IUnknown interface on the object that is to be locked or unlocked.

[in] fVisible

Whether the object is visible. If TRUE, OLE increments the reference count to hold the object visible and alive regardless of external or internal IUnknown::AddRef and IUnknown::Release operations, registrations, or revocation. If FALSE, OLE releases its hold (decrements the reference count) and the object can be closed.

Return value

This function returns S_OK on success. Other possible values include the following.

Return code Description
E_OUTOFMEMORY
 Insufficient memory for the operation.
E_INVALIDARG
 One or more parameters are invalid.
E_UNEXPECTED
 An unexpected error occurred.

Remarks

The OleNoteObjectVisible function calls the CoLockObjectExternal function. It is provided as a separate function to reinforce the need to lock an object when it becomes visible to the user and to release the object when it becomes invisible. This creates a strong lock on behalf of the user to ensure that the object cannot be closed by its container while it is visible.

Requirements

Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header ole2.h
Library Ole32.lib
DLL Ole32.dll

See also

CoLockObjectExternal