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Chapter 6 Application Programs
Example Program for C and C++
135
6
Example Program for C and C++
The following C programming example shows you how to send and receive
formatted I/O. This example programming shows you how to use the SCPI
commands for the instrument with the VISA functionality and does include
error trapping. For more information on non-formatted I/O and error trapping,
refer to the Agilent Technologies VISA
User’s Guide
.
The following C programming example was written in Microsoft
®
Visual C++
version 1.52 using project type “QuickWin application’’, and using the large
memory model and C++ version 4.x or 5.0 using project type “Windows 32
application’’. Be sure to move the “ visa.lib (Windows
®
3.1) or visa32.lib
(Windows
®
95/NT)” and “
visa.h” file to the lib and include development
directory. These are usually found in the
c:\vxipnp\win(win95
or
winnt)\lib\msc
or
c:\vxipnp\win (win95
or
winnt)\include
directory.
Diode.c
/*Diode.C
This example program steps the power supply through 11 voltages and measures the current
response. It prints the voltage step and the current response as a table. Note that the
GPIB address is the default address from the factory for the power supply.*/
#include <visa.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <conio.h>
#include <stdlib.h>
ViSession defaultRM; /* Resource manager id */
ViSession power_supply; /* Identifies power supply */
int bGPIB = 1; /* Set the number to 0 for use with the RS-232 */
long ErrorStatus; /* VISA Error code */
char commandString[256];
char ReadBuffer[256];
void delay(clock_t wait);
void SendSCPI(char* pString);
void CheckError(char* pMessage);
void OpenPort();
void main()
{
double voltage; /* Value of voltage sent to power supply */
char Buffer[256]; /* String returned from power supply */
double current; /* Value of current output of power supply */
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