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168 Chapter 3
Programming Examples
Using C Programming Over Socket LAN (Windows NT)
Using C Programming Over Socket LAN
(Windows NT)
This is the C programming example getopt.c that demonstrates simple
socket programming. It is written in C, and compiles in the Windows
NT environment.
In Windows, the routines send() and recv() must be used, since
fread() and fwrite() may not work on sockets.
The program reads the analyzer’s host name from the command line,
followed by the SCPI command. It then opens a socket to the analyzer,
using port 5025, and sends the command. If the command appears to be
a query, the program queries the analyzer for a response, and prints the
response.
This example program can also be used as a utility to talk to your
analyzer from the command prompt on your Windows NT PC, or from
within a script.
/***************************************************************************
getopt(3C) getopt(3C)
NAME
getopt - get option letter from argument vector
SYNOPSIS
int getopt(int argc, char * const argv[], const char *optstring);
extern char *optarg;
extern int optind, opterr, optopt;
DESCRIPTION
getopt returns the next option letter in argv (starting from argv[1])
that matches a letter in optstring. optstring is a string of
recognized option letters; if a letter is followed by a colon, the
option is expected to have an argument that may or may not be
separated from it by white space. optarg is set to point to the start
of the option argument on return from getopt.