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Parameter Attributes

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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:

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