POSITION

  • 项目

This structure specifies a placeholder for a linked list.

struct __POSITION { int unused; };
typedef __POSITION* POSITION;

Members

  • unused
    Integer value that specifies the location of an item in a linked list.

Remarks

This structure can point to any element in a linked list, including null elements (such as an end-of-list marker). This structure will, however, become invalid if you delete the item it points to.

When you perform operations that return a POSITION pointer on a single list element, a successful operation sets it to an appropriate non-null value, while NULL indicates that the items position could not be found. When you perform operations on the entire list, the pointer represents a Win32 BOOLEAN value, where TRUE indicates success and FALSE indicates failure.

Requirements

DirectShow applications and DirectShow filters have different include file and link library requirements. See Setting Up the Build Environment for more information.

OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.
Header: Dshow.h.

See Also

CBaseList::GetHeadPositionI | CBaseList::GetTailPositionI

Last updated on Wednesday, April 13, 2005

© 2005 Microsoft Corporation. All rights reserved.