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DBT_QUERYCHANGECONFIG Overview  Group

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

DBT_CONFIGCHANGECANCELED, DBT_CONFIGCHANGED, WM_DEVICECHANGE 

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