flOptions (ULONG) - input

The following flags are used to specify various options:

DSP_QUERY_OPT_PARMS

Get the optional parameters. The default does not query optional parameters. If this flag is not set, pszOptionalParameters is set to NULL.
DSP_QUERY_CURRENT_DRIVER
Get information about the current driver. In this case, no driver name is specified; instead, the name of the current driver is returned in pszDriverName.
DSP_QUERY_DEFAULT_DRIVER
Get information about the default driver. In this case, no driver name is specified; instead, the name of the default driver is returned in pszDriverName.

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