The OS/2 multimedia system provides a number of system-wide values that can be queried and set by applications. Because OS/2 multimedia applications such as Volume Control and Multimedia Setup allow users to set system values, it is recommended that applications only query the settings users have selected. The following table describes the system values that can be queried and set using mciQuerySysValue and mciSetSysValue.
旼컴컴컴컴컴컴컴컴컴컫컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴커 쿞ystem Value 쿏escription � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 쿘SV_CLOSEDCAPTION 쿜uery or set the current state of a � � 쿬aptioning flag. � � 쿍y querying the setting of this flag, an � � 쿪pplication can determine whether to display � � 퀃ext along with audio, for example, for a � � 쿴earing-impaired user. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 쿘SV_MASTERVOLUME 쿜uery or set the current master audio level. � � 쿟his value acts as a "multiplier" of the � � 쿶ndividual volume levels of each device � � 쿬ontext, allowing one application to control � � 퀃he volume for a number of open devices or � � 쿮lements. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 쿘SV_HEADPHONES 쿝eserved for future use. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 쿘SV_SPEAKERS 쿝eserved for future use. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 쿘SV_WORKPATH 쿜uery or set the directory for storing of � � 퀃emporary files by the media driver. � � 쿟his value can be used to point to, for � � 쿮xample, a directory on the hard disk that � � 쿴olds waveform data from a recording � � 쿽peration. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 쿘SV_SYSQOSERRORFLAG 쿜uery the Quality of Service (QOS) error � � 쿯lag. � � 쿍y querying this flag, an application can � � 쿭etermine an error occuring during band-width� � 퀁eservation. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 쿘SV_SYSQOSVALUE 쿜uery or set the QOS specification value. � � 쿟his system-wide Quality of Service (QOS) � � 퀂pecification value is used for band-width � � 퀁eservation (for example, bytes per second) � � 쿽ver the network. � 읕컴컴컴컴컴컴컴컴컴컨컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴켸
The following code fragment demonstrates how to obtain the multimedia work path.
CHAR szWorkpath[CCHMAXPATH] ; /* Work path for temporary files */
if ( mciQuerySysValue( MSV_WORKPATH, szWorkPath ) )
{
/* mciQuerySysValue was successful, szWorkPath now */
/* contains the multimedia workpath */
}