IAccessibleHandler::AccessibleObjectFromID method (oleacc.h)

Článek
02/22/2024

The AccessibleObjectFromID method retrieves an IAccessible interface pointer for the interface associated with the given object ID. Oleacc.dll uses this method to obtain an IAccessible interface pointer for proxies that are supplied by other code.

Note IAccessibleHandler::AccessibleObjectFromID is deprecated and should not be used.

Syntax

HRESULT AccessibleObjectFromID(
  [in]  long         hwnd,
  [in]  long         lObjectID,
  [out] LPACCESSIBLE *pIAccessible
);

Parameters

[in] hwnd

Type: long

Specifies the handle of a window for which an IAccessible interface pointer is to be retrieved.

[in] lObjectID

Type: long

Specifies the object ID. This value is one of the standard object identifier constants or a custom object ID.

[out] pIAccessible

Type: LPACCESSIBLE*

Specifies the address of a pointer variable that receives the address of the object's IAccessible interface.

Return value

Type: HRESULT

If successful, returns S_OK.

If not successful, returns one of the following or another standard COM error code.

Error	Description
E_INVALIDARG	An argument is not valid.
E_NOINTERFACE	The requested interface is not supported.

Remarks

Oleacc calls this function to obtain an IAccessible interface pointer for HWNDs that have the class name that this handler is registered for.

At startup, Oleacc looks in the registry key HKLM\SOFTWARE\Microsoft\Active Accessibility\Handlers and enumerates over each subkey (Oleacc expects the subkey to be a GUID). Oleacc reads the associated class name from HKCR\CLSID{guid}\AccClassName, where {guid} was the GUID found under the HKLM\SOFTWARE\Microsoft\Active Accessibility\Handlers key. When Oleacc finds a window with a class name that matches the GUID, it CoCreates the object using the GUID, retrieves the IAccessibleHandler interface pointer, and calls AccessibleObjectFromID on it to get at IAccessible interface pointer.

As with other IAccessible methods and functions, clients might receive errors for IAccessible interface pointers because of a user action. For more information, see Receiving Errors for IAccessible Interface Pointers.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Target Platform	Windows
Header	oleacc.h
Library	Oleacc.lib
DLL	Oleacc.dll
Redistributable	Active Accessibility 1.3 RDK on Windows NT 4.0 with SP6 and later and Windows 95

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