DBT_QUERYCHANGECONFIG
The operating
system sends the DBT_QUERYCHANGECONFIG device message to request permission to
change the current configuration (dock or undock). Any application can deny
this request and cancel the change.
To send the
DBT_QUERYCHANGECONFIG device message, the operating system sends the WM_DEVICECHANGE message with wParam set
to DBT_QUERYCHANGECONFIG and lParam set to zero.
Parameters
lParam
lParam is zero when the WM_DEVICECHANGE message is sent with
wParam set to DBT_QUERYCHANGECONFIG.
Return Values
Return TRUE
to grant permission to change the configuration.
Return
BROADCAST_QUERY_DENY to deny permission to change the configuration.
See Also