|Microsoft DirectX 9.0|
If the user removes a Plug and Play device that the graph was using, the filter graph manager posts an EC_DEVICE_LOST event. If the device becomes available again, the filter graph manager posts another EC_DEVICE_LOST event. However, the previous state of the capture filter is no longer valid. The application must rebuild the graph to use the device.
DirectShow does not send any event when a new device is plugged in. To learn when a new device is available, the application can monitor WM_DEVICECHANGE window messages. For more information, see "Device Management" in the Platform SDK documentation.