IDirectDrawSurface7::GetUniquenessValue method

Retrieves the current uniqueness value for this surface.

Syntax


HRESULT GetUniquenessValue(
  [out] LPDWORD lpValue
);

Parameters

lpValue [out]

A pointer to a variable that receives the surface's current uniqueness value if the call succeeds.

Return value

If the method succeeds, the return value is DD_OK.

If it fails, the method can return one of the following error values:

  • DDERR_INVALIDOBJECT
  • DDERR_INVALIDPARAMS

Remarks

The only defined uniqueness value is 0, which indicates that the surface is likely to be changing beyond the control of DirectDraw. Other uniqueness values are significant only if they differ from a previously cached uniqueness value. If the current value is different from a cached value, the contents of the surface have changed.

You must use LoadLibrary to explicitly link to Ddraw.dll and then use GetProcAddress to access the GetUniquenessValue method.

Requirements

Header

Ddraw.h

Library

Ddraw.lib

DLL

Ddraw.dll

See also

IDirectDrawSurface7

 

 

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