IDirectDraw4::EnumSurfaces

  • 项目

This method enumerates all of the existing or possible surfaces that meet the specified surface description.

HRESULT EnumSurfaces( 
  DWORD dwFlags, 
  LPDDSURFACEDESC2 lpDDSD2, 
  LPVOID lpContext, 
  LPDDENUMSURFACESCALLBACK2 lpEnumSurfacesCallback
);

Parameters

  • dwFlags
    A combination of one search type flag and one matching flag. The search type flag determines how the method searches for matching surfaces; you can search for surfaces that can be created using the description in the lpDDSD2 parameter or you can search for existing surfaces that already match that description. The matching flag determines whether the method enumerates all surfaces, only those that match, or only those that do not match the description in the lpDDSD2 parameter.
    Search type flag Description
    DDENUMSURFACES_CANBECREATED Enumerates the first surface that can be created and meets the search criterion. This flag can only be used with the DDENUMSURFACES_MATCH flag.
    DDENUMSURFACES_DOESEXIST Enumerates the already existing surfaces that meet the search criterion.
    Matching flag Description
    DDENUMSURFACES_ALL Enumerates all of the surfaces that meet the search criterion. This flag can only be used with the DDENUMSURFACES_DOESEXIST search type flag.
    DDENUMSURFACES_MATCH Searches for any surface that matches the surface description
    DDENUMSURFACES_NOMATCH Searches for any surface that does not match the surface description.
  • lpDDSD2
    Address of a DDSURFACEDESC2 structure that defines the surface of interest. This parameter can be NULL if dwFlags includes the DDENUMSURFACES_ALL flag.
  • lpContext
    Address of an application-defined structure that will be passed to each enumeration member.
  • lpEnumSurfacesCallback
    Address of the EnumSurfacesCallback2 function the enumeration procedure will call every time a match is found.

Return Values

If the method succeeds, the return value is DD_OK.

If the method fails, the return value may be one of the following error values:

DDERR_INVALIDOBJECT
DDERR_INVALIDPARAMS

Remarks

If the DDENUMSURFACES_CANBECREATED flag is set, this method attempts to create a surface that temporarily meets the search criterion.

When using the DDENUMSURFACES_DOESEXIST flag, note that an enumerated surface's reference count is incremented.

If you are not going to use the surface, be sure to use IUnknown::Release to release it after each enumeration. If you will be using the surface, release it when it is no longer needed.

This method differs from its counterparts in previous interface versions in that it accepts a pointer to an EnumSurfacesCallback2 function, rather than an EnumSurfacesCallback function.

Requirements

OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.
Header: Ddraw.h.
Link Library: Ddraw.lib.

 Last updated on Thursday, April 08, 2004

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