National Instruments VXI-1394 - Manual (Page 31)

Chapter 3 Developing Your Application
VXI-1394 User Manual for Windows 3-10 ni.com
Debugging
NI Spy and VISAIC are useful utilities for identifying the causes of
problems in your application.
NI Spy tracks the calls your application makes to National Instruments
programming interfaces, including NI-VISA, NI-VXI, and NI-488. NI Spy
highlights functions that return errors, so during development you can
quickly spot which functions failed during a program’s execution. NI Spy
can log the calls your program makes to these drivers so you can check
them for errors at your convenience, or use the NI Spy log as a reference
when discussing the problem with National Instruments technical support.
Figure 3-4 shows an example of a normal error returned from a call to
viMemAlloc when no memory has been shared.
Figure 3-4. NI Spy