Attributes
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Attributes
Windows Portable Devices supports the following attributes.
| Attribute | VarType | Description |
| WPD_PROPERTY_ATTRIBUTE_CAN_DELETE | VT_BOOL | A Boolean value that specifies whether the client can delete the property. To delete a property, set its value to VT_EMPTY. |
| WPD_PROPERTY_ATTRIBUTE_CAN_READ | VT_BOOL | A Boolean value that specifies whether clients can read the property. |
| WPD_PROPERTY_ATTRIBUTE_CAN_WRITE | VT_BOOL | A Boolean value that specifies whether the client can modify the property. |
| WPD_PROPERTY_ATTRIBUTE_DEFAULT_VALUE | VT_XXXX | A value that is defined by the device that specifies the default value of a property. This applies to writeable properties only. |
| WPD_PROPERTY_ATTRIBUTE_ENUMERATION_ELEMENTS | VT_UNKNOWN | An IPortableDevicePropVariantCollection interface that contains a collection of values for a property whose WPD_PROPERTY_ATTRIBUTE_FORM attribute is WPD_PROPERTY_ATTRIBUTE_FORM_ENUMERATION. The data type depends on the property being queried. |
| WPD_PROPERTY_ATTRIBUTE_FAST_PROPERTY | VT_BOOL | If True, then this property belongs to the fast properties group. These are properties that can be very quickly retrieved from the device. |
| WPD_PROPERTY_ATTRIBUTE_FORM | VT_UI4 | A WpdAttributeForm enumerated value that specifies the form of the valid values allowed for this property. |
| WPD_PROPERTY_ATTRIBUTE_RANGE_MAX | VT_XXXX | The maximum value for a property whose WPD_PROPERTY_ATTRIBUTE_FORM attribute is WPD_PROPERTY_ATTRIBUTE_FORM_RANGE. The data type can be any of the numeric types. |
| WPD_PROPERTY_ATTRIBUTE_RANGE_MIN | VT_XXXX | The minimum value for a property whose WPD_PROPERTY_ATTRIBUTE_FORM attribute is WPD_PROPERTY_ATTRIBUTE_FORM_RANGE. The data type can be any of the numeric types. |
| WPD_PROPERTY_ATTRIBUTE_RANGE_STEP | VT_XXXX | The step value for a property whose WPD_PROPERTY_ATTRIBUTE_FORM attribute is WPD_PROPERTY_ATTRIBUTE_FORM_RANGE. The step specifies by how much a range property must change. For example, a property with a minimum value of 10, a maximum value of 20, and a step of 5 could have the following values: 10, 15, 20. The data type can be any of the numeric types. |
| WPD_PROPERTY_ATTRIBUTE_REGULAR_EXPRESSION | VT_LPWSTR | A regular expression string that specifies acceptable values for properties whose form is WPD_PROPERTY_ATTRIBUTE_FORM_REGULAR_EXPRESSION. |
| WPD_PROPERTY_ATTRIBUTE_MAX_SIZE | VT_UI8 | A value that specifies the maximum size (in bytes) for the value of this property. |
| WPD_RESOURCE_ATTRIBUTE_CAN_DELETE | VT_BOOL | A Boolean value that specifies whether a client has permission to delete the resource. If absent, then it is assumed to be false. |
| WPD_RESOURCE_ATTRIBUTE_CAN_READ | VT_BOOL | A Boolean value that specifies whether a client has permission to open the resource for Read access. If absent, then it is assumed to be False. |
| WPD_RESOURCE_ATTRIBUTE_CAN_WRITE | VT_BOOL | A Boolean value that specifies whether a client has permission to open the resource for Write access. If absent, then it is assumed to be false. |
| WPD_RESOURCE_ATTRIBUTE_OPTIMAL_READ_BUFFER_SIZE | VT_UI4 | The recommended buffer size that a caller should use for buffered reads from the resource. |
| WPD_RESOURCE_ATTRIBUTE_OPTIMAL_WRITE_BUFFER_SIZE | VT_UI4 | The recommended buffer size that a caller should use for buffered writes on the resource. |
| WPD_RESOURCE_ATTRIBUTE_TOTAL_SIZE | VT_UI8 | The total size of the resource data, in bytes. |
Requirements
Header: Defined in PortableDevice.h
See Also
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