mciQuerySysValue - Parameters

iSysValue (USHORT) - input

Specifies the system attribute. The possible system attributes are:

MSV_CLOSEDCAPTION

Returns TRUE if the user has enabled closed captioning and FALSE otherwise.
MSV_MASTERVOLUME
The master volume setting. The range is 0 to 100.
MSV_HEADPHONES
Returns TRUE if the user has headphones enabled for the system and FALSE otherwise.
MSV_SPEAKERS
Returns TRUE if the user has speakers (line out) enabled for the system and FALSE otherwise.
MSV_WORKPATH
Points to a character buffer of size CCHMAXPATH. This is the name of the file-system path where temporary files created by OS/2 multimedia are located (for example, c:\mmos2\temp).
MSV_SYSQOSVALUE
System wide Quality of Service (QOS) specification value used for band-width reservation (for example, bytes per second) over the network.
MSV_SYSQOSERRORFLAG
Description of error occurring during band-width reservation.

pValue (PVOID) - in/out

Pointer to the return field. The type of data object this field points to is dependent on the attribute requested:

System Attribute

Data Type
MSV_CLOSEDCAPTION
BOOL
MSV_MASTERVOLUME
ULONG
MSV_HEADPHONES
ULONG
MSV_SPEAKERS
ULONG
MSV_WORKPATH
PSZ
MSV_SYSQOSVALUE
ULONG
MSV_SYSQOSERRORFLAG
ULONG

rc (BOOL) - returns

If the command completes successfully then MCIERR_SUCCESS is returned, otherwise non-zero is returned.

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