How do you change the GPIB calls made by the instrument drivers?

[Haomiao]

Is there any way of looking at/changing the GPIB calls made by the driver files generated by LabWindows? I made a driver for the LeCroy 9354 but it's not working right, and I'd like to get in and see if I need to change the calls themselves, but all I can get into is the c instrument headers/source files, which don't tell you what calls are being made. GPIB Spy lets me see the calls, but I can't change them. If anyone can help, please let me know. Thanks!

[Ryan_M]

NI-spy only captures call. You will not have the ability to intercept function calls and alter them. Since you have access to the source code,though, adding functions and breakpoints should be a simple task.