Microsoft DirectX 9.0 |
The GetParameterRange method returns the valid range of values for a parameter. This method applies to parameters that support a stepped range of values, as opposed to a list of specific values.
Syntax
HRESULT GetParameterRange(
const GUID* Api,
VARIANT* ValueMin,
VARIANT* ValueMax,
VARIANT* SteppingDelta
);
Parameters
Api
[in] Pointer to a GUID that specifies the parameter.
ValueMin
[out] Pointer to a VARIANT type that receives the minimum value of the parameter.
ValueMax
[out] Pointer to a VARIANT type that receives the maximum value of the parameter.
SteppingDelta
[out] Pointer to a VARIANT type that receives the stepping delta, which defines the valid increments from ValueMin to ValueMax.
Return Values
If the method succeeds, it returns S_OK. If it fails, it returns an HRESULT error code.
Remarks
The valid range for the parameter is [ValueMin ... ValueMax], with increments of SteppingDelta. If a parameter supports a stepped range of values, it must use one of the following variant types:
By definition, the parameter will return a specific type.
Any stepping value is valid. If the range has no stepping delta (that is, you can increment by any value), the encoder should return an empty value (VT_EMPTY) for SteppingDelta.
See Also