Autodetect the Printer's Hard Drive for PPD

Add entries to the GDL file for any hard drive-related features in your PPD file. You can do this by creating a corresponding feature construct in the GDL file using the same technique shown in the previous example. The following GDL construct automatically detects whether a hard disk is installed.

*% The GDL parser merges this feature definition with the 
*% corresponding feature construct in the GPD file
*Feature: PrinterHardDisk
{
  *FeatureType: PRINTER_PROPERTY

  *BidiQuery: PrinterHardDisk
  {
     *QueryString: "\Printer.Configuration.HardDisk:Installed"
  }
  *BidiResponse: PrinterHardDisk
  {
     *ResponseType: BIDI_BOOL
     *ResponseData: ENUM_OPTION (PrinterHardDisk)
  }
  *Option: FALSE
  {
     *BidiValue: BOOL(FALSE)
  }
  *Option: TRUE
  {
     *BidiValue: BOOL(TRUE)
  }
}