[Applies to UMDF 1.x only]
The OnQueryStop method notifies a driver before a device is stopped.
- pWdfDevice [in]
A pointer to the IWDFDevice interface for the device object of the device that will be stopped.
If the driver determines that the device can be stopped, the OnQueryStop callback method must return S_OK or another status code for which SUCCEEDED(status) equals TRUE. Otherwise it must return a status code for which SUCCEEDED(status) equals FALSE. HRESULT error codes are defined in Winerror.h. Do not return HRESULT_FROM_NT(STATUS_NOT_SUPPORTED).
This method must use the HRESULT_FROM_NT macro to return a specific HRESULT value to return status to a kernel-mode client. For more information, see Supporting Kernel-mode Clients.
The framework does not synchronize the OnQueryStop callback function with other PnP and power management callback functions.
OnQueryStop is not called in framework versions 1.7 and earlier.
For more information about the OnQueryStop callback method, see The PnP Manager Redistributes System Resources.