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Windows Driver Kit DDI reference (nf-wiamdef-wiasgetpropertyattributes)

wiasGetPropertyAttributes function

Description

The wiasGetPropertyAttributes function retrieves the access flags and valid values for a set of properties.

Parameters

`pWiasContext` [in]

Pointer to a WIA item context.

`cPropSpec`

Specifies the number of properties.

`pPropSpec` [in]

Pointer to a PROPSPEC structure indicating the properties for which to get valid values and access flags.

`pulAccessFlags`

Pointer to an array that contains the access flags for the properties.

`pPropVar` [out]

Pointer to an array of PROPVARIANT structures that contains the valid values for the properties.

Return value

On success, the function returns S_OK.

If the function fails, it returns a standard COM error or one of the WIA error codes.

Remarks

This function fills each element of the pPropVar array with a PROPVARIANT structure that specifies the valid values for the corresponding property. Properties with the access rights flag WIA_PROP_NONE have no valid values for that property. The data type for the valid values of these properties is VT_EMPTY.

One or more of the WIA_PROP_Xxx property attributes and access flags can be returned in each element of the pulAccessFlags array.

If the property has a range of valid values, the values can be determined through the pPropVar parameter upon completion of this function. The pPropVar parameter specifies an array of PROPVARIANT structures.

Valid integer and floating-point values in a range are accessed using the following index constants.

Valid value index	Description
WIA_RANGE_MIN	Minimum value
WIA_RANGE_NOM	Nominal value
WIA_RANGE_MAX	Maximum value
WIA_RANGE_STEP	Increment value

Valid list values are accessed using the following index constants.

Valid value index	Description
WIA_LIST_COUNT	Count of valid list values, not counting the nominal value
WIA_LIST_NOM	Nominal value
WIA_LIST_VALUES	Index to first valid value

Valid bitwise flag values are accessed using the following index constants.

Valid value index	Description
WIA_FLAG_NOM	Nominal value
WIA_FLAG_VALUES	All valid flags are joined together by an OR operator

View the official Windows Driver Kit DDI reference