UsbDeregisterNotification

Description

Removes the registration of attach/detach notification semaphores.

Syntax

ulrc = UsbDeregisterNotification(NotifyID)

Parameters

NotifyID

the NotifyID received from UsbChangeNotification or UsbDeviceNotification.

Return Code

0x0000 - NO_ERROR

Errors

0x0006 - ERROR_INVALID_HANDLE
0x001F - ERROR_GEN_FAILURE
0x0057 - ERROR_INVALID_PARAMETER
0x005F - ERROR_INTERRUPT
0x0064 - ERROR_TOO_MANY_SEMAPHORES
0x0067 - ERROR_TOO_MANY_SEM_REQUESTS
0x0069 - ERROR_SEM_OWNER_DIED
0x1B58 - USB_NOT_INIT
0xFF1F - ERROR_GEN_FAILURE
0xFF57 - ERROR_INVALID_PARAMETER
0xFFBB - ERROR_SEM_NOT_FOUND

Example Code

//Code Snippet - UsbDeregisterNotification
{
  ulrc = UsbDeregisterNotification(NotifyID);
  printf("\nUsbDeregisterNotification - ulrc&colon. 0x%04X (%hu)",ulrc,ulrc);

  //release semaphores
  ulrc = DosCloseEventSem(hDeviceAdded);
  printf("\nDosCloseEventSem - ulrc&colon. 0x%04X (%hu)",ulrc,ulrc);
  ulrc = DosCloseEventSem(hDeviceRemoved);
  printf("\nDosCloseEventSem - ulrc&colon. 0x%04X (%hu)",ulrc,ulrc);
}