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Chapter 3      Software Overview

NI-VXI User Manual

3-2

© National Instruments Corporation

CloseVXIlibrary

 is the application termination routine, which

must be included at the end (or abort) of any application.

CloseVXIlibrary

 disables interrupts and frees dynamic memory

allocated for the internal RM table and other structures. You must
include a call to 

CloseVXIlibrary

 at the termination of your

application (for whatever reason) to free all data structures allocated
by 

InitVXIlibrary

 and disable interrupts. Failure to call

CloseVXIlibrary

 when terminating your application can cause

unpredictable and undesirable results. If your application can be
aborted from some operating system abort routine (such as a break key
or a process kill signal), be certain to install an abort/close routine to
call 

CloseVXIlibrary

.

CreateDevInfo

 creates a new entry in the dynamic NI-VXI RM table

for the specified logical address. It installs default 

NULL

 values into the

entry. You must use one of the 

SetDevInfo

 functions after this point

to change any of the device information as needed. This operation is
not needed for VME devices since it is recommended that you use the
Non-VXI Device Editor in the 

VXIedit

 or 

VXItedit

 NI-VXI

resource editor utility. At the startup of your application,

InitVXIlibrary

 completely initializes the RM table to how the RM

configured the VXI system. No initial changes/creations are necessary
for VXI devices. You can use 

CreateDevInfo

 to add non-VXI

devices or pseudo-devices (future expansion).

FindDevLA

 scans the RM table information for a device with the

specified attributes and returns its VXI logical address. You can use
any combination of attributes to specify a device. A -1 (negative one)
or 

""

 specifies to ignore the corresponding field in the attribute

comparison. After finding the VXI logical address, you can use one of
the 

GetDevInfo

 functions to get any information about the specified

device.