HP 8163A Programming Manual page 166

Programming Examples
How to Log Results
}
void checkError(ViStatus session, ViStatus err_status )
{
ViStatus error;
ViChar errMsg[256];
error = viQueryf(session,"SYST:ERR?\n","%t",errMsg);
if (error == VI_ERROR_TMO)
{
printf("System Error!\n") ;
exit(1);
}
else
{
/* only errors should be displayed */
if(errMsg[0] != '+')
printf("error:%ld --> %s\n", err_status,errMsg) ;
}
}
ViStatus InitVisa ( ViSession *iHandle)
{
ViStatus errStatus;
ViSession defaultRM;
/* First get initialized the visa library (see example 1) */
errStatus = viOpenDefaultRM (&defaultRM);
if (errStatus < VI_SUCCESS)
printf("Failed to open VISA Resource manager\n");
/* Open session to HPIB device at address 20; */
errStatus = viOpen (defaultRM, "GPIB::20::INSTR", VI_NULL,VI_NULL,iHandle);
if (errStatus < VI_SUCCESS)
printf("Failed to open instrument\n");
return errStatus;
}
166
/* returned error code from visa call */
/* default visa resource manager variable */