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List (WSD)

  • Artykuł

The Web Services for Devices (WSD) List construct is a string type that composes a comma-separated list of values specified by the XPath filter query. The List construct is defined in WsdBidi.xsd.

Attribute Description
drvPrinterEvent (Optional) A Boolean value that indicates whether the port monitor sends notifications to the driver. A TRUE value indicates that the port monitor sends notifications to the driver; FALSE indicates that the port monitor does not send notifications to the driver.
filter The XPath query that the WSD monitor applies to the XML document that is specified by the query. See the discussion later in this topic.
name The name of the schema value.
query The type of query that the WSD monitor performs.

The XPath language, implemented in Windows beginning with Microsoft XML (MSXML) 2.6, provides a convenient way to specify elements in an XML file. See the XPath Reference for more information.

The List construct is defined in WsdBidi.xsd.

Code example

In the following code example, a comma-separated list is composed that contains the allowable number of page images per sheet for N-up printing, for instance "1,2,4".

<Property name='Layout'>
  <Property name='NumberUp'>
    <Property name='PagesPerSheet'>
      <List name='Supported
        query='wprt:PrinterCapabilities'
        filter='wprt:PrinterCapabilites/wprt:JobValues/wprt:DocumentProcessing/wprt:NumberUp/wprt:NUpPagesPerSheet/wprt:AllowedValue'/>
    </Property>
  </Property>
</Property>

The preceding example results in the following query:

\Printer.Layout.NumberUp.PagesPerSheet:Supported