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IAccPropServices.ComposeHwndIdentityString Method

The IAccPropServices interface and all of its exposed members are part of a managed wrapper for the Component Object Model (COM) IAccPropServices interface.

Namespace:  Accessibility
Assembly:  Accessibility (in Accessibility.dll)

void ComposeHwndIdentityString(
	ref _RemotableHandle hwnd,
	uint idObject,
	uint idChild,
	IntPtr ppIDString,
	out uint pdwIDStringLen


Type: Accessibility._RemotableHandle%
Specifies the HWND of the accessible element that the caller wants to identify.
Type: System.UInt32
Specifies the object ID of the accessible element.
Type: System.UInt32
Specifies the child ID of the accessible element.
Type: System.IntPtr
Pointer to a buffer that receives the identity string. The callee allocates this buffer using CoTaskMemAlloc. When finished, the caller must free the buffer by calling CoTaskMemFree.
Type: System.UInt32%
Pointer to a buffer that receives the length of the identity string.

For more information about IAccPropServices, see the documentation about "Dynamic Annotation" in the Microsoft Active Accessibility documentation in the MSDN library at

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.