RxUsbDeregisterNotification

Description
Removes the registration of attach/detach notification semaphores.

Syntax
rc = RxUsbDeregisterNotification(NotifyID)

Parameters

 * NotifyID : the NotifyID received from RxUsbChangeNotification or RxUsbDeviceNotification.

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

Remarks
Device attach/detach notifications may be obtained by registering event semaphores to be posted upon attach/detach of USB devices. The RexxUtil library provides functions to work with event semaphores. Some of these are used in the example code.

Example Code
/* add RxUsbDeregisterNotification */ rc = RxFuncAdd('RxUsbDeregisterNotification','usbcalls','RxUsbDeregisterNotification') say '+RxUsbDeregisterNotification,RC=0x'd2x(rc)

/* invoke RxUsbDeregisterNotification */ rc = RxUsbDeregisterNotification(NotifyID) say '*RxUsbDeregisterNotification,RC=0x'd2x(rc)

/* drop RxUsbDeregisterNotification */ rc = RxFuncDrop('RxUsbDeregisterNotification') say '-RxUsbDeregisterNotification,RC=0x'd2x(rc)

/* add SysCloseEventSem */ rc = RxFuncAdd('SysCloseEventSem','RexxUtil','SysCloseEventSem') say '+SysCloseEventSem,RC=0x'd2x(rc)

/* invoke SysCloseEventSem */ rc = SysCloseEventSem(hSemAttach) say '*SysCloseEventSem,RC=0x'd2x(rc) rc = SysCloseEventSem(hSemDetach) say '*SysCloseEventSem,RC=0x'd2x(rc)

/* drop SysCloseEventSem */ rc = RxFuncDrop('SysCloseEventSem') say '-SysCloseEventSem,RC=0x'd2x(rc)

Related Functions

 * RxUsbRegisterChangeNotification
 * RxUsbRegisterDeviceNotification