## MMPM/2 Device Driver Reference

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### VSD_QUERYMIXCONNECTIONS - Syntax

This subcommand of the VSD_QUERY command queries the output that a particular VSD line (or connector) is routed to. For further information about VSD mixer support and functions, see Audio Sample for Vendor-Specific Drivers and Mixer IOCtl Functions Introduction

This command is sent using VSDEntry as follows:

        VSDEntry(hvsd, ulFunc, ulFlags, pRequest)

hvsd (HVSD) Handle to a VSD.

ulFunc (ULONG) Set to VSD_QUERY.

ulFlags (ULONG) Set to VSD_QUERYMIXCONNECTIONS.

pRequest (PLINECONNECTIONS) A pointer to the LINECONNECTIONS structure.

rc (ULONG) Error code indicating success or the type of failure:

VSDERR_MISSING_PARAMETER One or more parameters are missing.

VSDERR_INVALID_SOURCE Invalid source.

VSDERR_INVALID_SINK Invalid sink.

VSDERR_INVALID_CONNECTION Invalid connection.