/*nonfmtio.c

  This example program measures the AC voltage on a multimeter and

  prints the results. Note that you must change the device address. */

#include <visa.h>

#include <stdio.h>

void main () {

  ViSession defaultRM, vi;

  char strres [20];

  unsigned int actual;

  /* Open session to GPIB device at address 22 */

  viOpenDefaultRM (&defaultRM);

  viOpen (defaultRM, "GPIB0::22::INSTR", VI_NULL,VI_NULL, &vi);

  /* Initialize device */

  viWrite (vi, (ViBuf)"*RST\n", 5, &actual);

  /* Set up device and take measurement */

  viWrite (vi, (ViBuf)"CALC:DBM:REF 50\n", 16, &actual);

  viWrite (vi, (ViBuf)"MEAS:VOLT:AC? 1, 0.001\n", 23, &actual);

  /* Read results */

  viRead (vi, (ViBuf)strres, 20, &actual);

  /* NULL terminate the string */

  strres [actual]=0;

  /* Print results */

  printf ("Mesurement Results: %s\n", strres);

  /* Close session */

  viClose (vi);

  viClose (defaultRM);

}