DRVM_MAPPER_RECONFIGURE

Sent to a mapper to indicate a system configuration change has occurred. This message is use primarily by Control Panel applications and internal system components.

The system intercepts this message and returns the appropriate value without sending the message to the device driver. Most drivers will not use this message.

• Returns MMSYSERR_NOERROR if the device is mappable; otherwise, returns an error value.

dwParam1

Depends on the flag in dwParam2.

dwParam2

Specifies the type of change plus the optional flag DRV_F_PARAM_IS_DEVNODE.

DRV_F_ADD	A new device has been added. dwParam1 contains either the SYSTEM.INI entry, or the devnode if the DEVNODE flag is set.
DRV_F_REMOVE	A device has been removed. dwParam1 contains either the SYSTEM.INI entry, or the devnode if the DEVNODE flag is set.
DRV_F_CHANGE	A device has been change. dwParam1 contains either the SYSTEM.INI entry, or the devnode if the DEVNODE flag is set.
DRV_F_PROP_INSTR	New MIDI instrument settings have been applied. dwParam1 is set to zero.
DRV_F_NEWDEFAULTS	New mapper defaults have been applied due to a change or because of a new logon. dwParam1 is set to zero.