User`s guide

42 Agilent VISA User’s Guide

3 Programming with VISA

Sample: Searching the VXI Interface for Resources

This code sample searches the VXI interface for resources.

The number of matches found is returned in nmatches, and

matches points to the string that contains the matches

found. The first call returns the first match found, the

second call returns the second match found, etc.

VI_FIND_BUFLEN is defined in the visa.h declarations file.

ViChar buffer [VI_FIND_BUFLEN];

ViRsrc matches=buffer;

ViUInt32 nmatches;

ViFindList list;

viFindRsrc(defaultRM, "VXI?*INSTR", &list,

&nmatches, matches);

viFindNext(list, matches);

viClose(list);

Table 10 Determining What to Use for the expr Parameter

Interface expr Parameter

GPIB GPIB[0-9]*::?*INSTR

VXI VXI?*INSTR

GPIB-VXI GPIB-VXI?*INSTR

GPIB and GPIB-VXI GPIB?*INSTR

All VXI ?*VXI[0-9]*::?*INSTR

ASRL ASRL[0-9]*::?*INSTR

All ?*INSTR