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IBDAComparable::HashEquivalent

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Microsoft DirectShow 9.0

IBDAComparable::HashEquivalent

This topic applies to Update Rollup 2 for Microsoft Windows XP Media Center Edition 2005 and later.

The HashEquivalent method generates a hash code for a subset of the tuning properties of an object.

Syntax

  HRESULT HashEquivalent(
  DWORD  dwFlags,
  __int64*  Result
);

Parameters

dwFlags

[in]  Specifies whether to alter the subset of properties that are to be incorporated by default into the hash code. Setting this parameter to 0 invokes the default behavior. Setting this parameter to the bitwise OR of one or more BDA_Comp_Flags enumeration values overrides the default behavior.

Result

[out]  Pointer to a variable that receives the result of the hash operation. This result is the hash code for the subset of the tuning properties of the object and its associated objects that are to be included in comparisons with other objects.

Return Values

If the method succeeds, it returns S_OK. If it fails, it returns an error code.

Remarks

This method generates a hash code from a subset of the tuning properties in the object that implements the IBDAComparable interface, and its associated objects.

The caller can compare the resulting hash code to the hash code for another object of the same type to determine whether the two objects contain equivalent tuning information. The hash code incorporates only the subset of properties in the object and its associated objects that is required to determine whether the properties are equivalent to those in another object. If the hash codes for the two objects are identical, the two objects contain equivalent tuning information.

Requirements

Header: Include Bdaiface.h.

See Also