Parameter Attributes

For Windows 7, Windows Portable Devices supports the following parameter attributes for methods and events of a device service. These attributes are returned by these methods:

• IPortableDeviceServiceCapabilities::GetMethodParameterAttributes
• IPortableDeviceServiceCapabilities::GetEventParameterAttributes

Attribute	VarType	Description
WPD_PARAMETER_ATTRIBUTE_DEFAULT_VALUE	VT_XXXX	The default value of the parameter.
WPD_PARAMETER_ATTRIBUTE_ENUMERATION_ELEMENTS	VT_UNKNOWN	An IPortableDevicePropVariantCollection interface that contains the enumeration values for the parameter.
WPD_PARAMETER_ATTRIBUTE_FORM	VT_UI4	The form of valid parameter values allowed.
WPD_PARAMETER_ATTRIBUTE_MAX_SIZE	VT_UI8	The maximum size of the parameter, in bytes .
WPD_PARAMETER_ATTRIBUTE_NAME	VT_LPWSTR	A string that specifies the script-friendly name of an event or method parameter. Valid characters are alphanumeric [a-zA-Z0-9] and '_'.
WPD_PARAMETER_ATTRIBUTE_ORDER	VT_UI4	The zero-based parameter-order index, so that an order value of 0 corresponds to the first parameter.
WPD_PARAMETER_ATTRIBUTE_RANGE_MIN	VT_XXXX	The maximum value for a parameter of the form WPD_PARAMETER_ATTRIBUTE_FORM_RANGE.
WPD_PARAMETER_ATTRIBUTE_RANGE_MAX	VT_XXXX	The minimum value for a parameter of the form WPD_PARAMETER_ATTRIBUTE_FORM_RANGE.
WPD_PARAMETER_ATTRIBUTE_RANGE_STEP	VT_XXXX	The step value for a parameter of the form WPD_PARAMETER_ATTRIBUTE_FORM_RANGE.
WPD_PARAMETER_ATTRIBUTE_REGULAR_EXPRESSION	VT_LPWSTR	A regular expression that specifies acceptable values for parameters of the form WPD_PARAMETER_ATTRIBUTE_FORM_REGULAR_EXPRESSION.
WPD_PARAMETER_ATTRIBUTE_USAGE_TYPE	VT_UI4	An integer that specifies the usage of a method parameter, for example, in/out. Valid values are of the WPD_PARAMETER_USAGE_TYPES enumeration type.
WPD_PARAMETER_ATTRIBUTE_VARTYPE	VT_UI4	The parameter VarType.

Requirements

Requirement	Value
Header	PortableDevice.h

See also

Properties and Attributes