User`s guide

26 Agilent VISA User’s Guide
2 Building a VISA Application in Windows
Logging Error Messages
When developing or debugging your VISA application, you
may want to view internal VISA messages while your
application is running. You can do this by using the Event
Viewer utility or the Debug Window. There are three choices
for VISA logging:
• Off (default) for best performance
• Event Viewer
• Debug Window
Using the Event Viewer
The Event Viewer utility provides a way to view internal VISA
error messages during application execution. Some of these
internal messages do not represent programming errors; they
indicate events which are being handled internally by VISA.
The process for using the Event Viewer is:
• Enable VISA logging from the Agilent IO Control by
clicking the blue IO icon on the taskbar and then clicking
Agilent VISA Options > VISA Logging > Event Viewer.
• Run your VISA program.
• View VISA error messages by running the Event Viewer.
From the Agilent IO Control, click Event Viewer. VISA error
messages will appear in the application log of the Event
Viewer utility.
Using the Debug Window
When VISA logging is directed to the Debug Window, VISA
writes logging messages using the Win32 API call
OutputDebugString(). The most common use for this feature
is when debugging your VISA program using an application