Example Program; Including The Visa Declarations File - Agilent Technologies ESA-E Series Programmer's Manual

C:\VXIPNP\WIN\LIB\MSC
Otherwise, the library and include files should be explicitly specified
in the project file.

Example Program

This example program queries a GPIB device for an identification
string and prints the results. Note that you must change the address if
something other than the ESA default value of 18 is required.
/*idn.c - program filename */
#include "visa.h"
#include <stdio.h>
void main ()
{
/*Open session to HP-IB device at address 18 */
ViOpenDefaultRM(&defaultRM);
ViOpen(defaultRM, "GPIB0::18::INSTR", VI_NULL,
VI_NULL, &vi);
/*Initialize device */
viPrintf(vi, "*RST\n");
/*Send an *IDN? string to the device */
printf(vi, "*IDN?\n");
/*Read results */
viScanf(vi, "%t", &buf);
/*Print results */
printf("Instrument identification string: %s\n", buf);
/* Close the sessions */
viClose(vi);
viClose(defaultRM);
}

Including the VISA Declarations File

For C and C++ programs, you must include the visa.h header file at
the beginning of every file that contains VTL function calls:
#include "visa.h"
This header file contains the VISA function prototypes and the
definitions for all VISA constants and error codes. The visa.h header
file includes the visatype.h header file.
Chapter 3
Programming Examples
C Programming Examples using VTL
3-7