IWDTFPNPAction2::EDTTryStopDevice method (wdtfpnpaction.h)

Attempts to send an IRP_MN_STOP_DEVICE event to the target device.

Syntax

HRESULT EDTTryStopDevice(
  [out, retval] VARIANT_BOOL *pbSuccess
);

Parameters

[out, retval] pbSuccess

True if the operation succeeds; otherwise, false.

Return value

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

EDTTryStopDevice attempts to trigger a PnP resource rebalance (e.g. IRP_MN_STOP_DEVICE) on the target device stack. The Stop IRP is not guaranteed. Other drivers on the stack can fail the IRP_MN_QUERY_STOP_DEVICE event which precedes the Stop IRP (resulting in an IRP_MN_CANCEL_STOP_DEVICE event). Also, the system may optimize if it detects that the target device does not use hardware resources (e.g. a USB mouse) and send a CancelStop IRP instead.

If your device does not consume hardware resources but you still wish to attempt to test how the drivers and applications handle the PnP resource rebalance, you can instead run the EDTTryStopDevice method on a parent device, grandparent, etc., which does consume hardware resources. For example, if your device is a USB mouse, you can run EDTTryStopDevice on the parent USB controller instead.

Requirements

Requirement	Value
Minimum supported client	Windows XP Professional
Minimum supported server	Windows Server 2008
Target Platform	Desktop
Header	wdtfpnpaction.h

See also

IWDTFPNPAction2