This is option parameter parsing example.
When we excute cmd file with option, this paser is parsing each value of options.
ex) facedetection.exe -o B.avi -p 1000 -l A.avi
in source, parameters is parsred by "B.avi", "1000", ""(-l option exist), "A.avi"
see example source code easier understanding.
main.cpp
#include < iostream>
#include < string>
#include "wingetopt.h"
using namespace std;
struct Options
{
Options():Number(10),use_A(false),infile(),outfile()
{}
int Number;
bool use_A;
string infile;
string outfile;
};
void parse_command_line(int argc, char** argv, Options& o)
{
int c = -1;
while( (c = getopt(argc, argv, "lo:p:")) != -1 )
{
switch(c)
{
case 'l':
o.use_A = true;
break;
case 'o':
o.outfile = optarg;
break;
case 'p':
o.Number = atoi(optarg);
break;
default:
cout << "error message" << endl;
exit(1);
}
}
if( optind < argc )
{
o.infile = argv[optind];
}
cout << "Num : " << o.Number << endl;
cout << "Input file: " << o.infile << endl;
cout << "Output file: " << o.outfile << endl;
cout << "Use A: " << o.use_A << endl;
}
int main(int argc, char** argv)
{
Options o;
parse_command_line(argc, argv, o);
}
...
wingetopt.h
/*
POSIX getopt for Windows
AT&T Public License
Code given out at the 1985 UNIFORUM conference in Dallas.
*/
#ifdef __GNUC__
#include
#endif
#ifndef __GNUC__
#ifndef _WINGETOPT_H_
#define _WINGETOPT_H_
#ifdef __cplusplus
extern "C" {
#endif
extern int opterr;
extern int optind;
extern int optopt;
extern char *optarg;
extern int getopt(int argc, char **argv, char *opts);
#ifdef __cplusplus
}
#endif
#endif /* _GETOPT_H_ */
#endif /* __GNUC__ */
...
wingetopt.c
/*
POSIX getopt for Windows
AT&T Public License
Code given out at the 1985 UNIFORUM conference in Dallas.
*/
#ifndef __GNUC__
#include "wingetopt.h"
#include < stdio.h>
#define NULL 0
#define EOF (-1)
#define ERR(s, c) if(opterr){\
char errbuf[2];\
errbuf[0] = c; errbuf[1] = '\n';\
fputs(argv[0], stderr);\
fputs(s, stderr);\
fputc(c, stderr);}
//(void) write(2, argv[0], (unsigned)strlen(argv[0]));\
//(void) write(2, s, (unsigned)strlen(s));\
//(void) write(2, errbuf, 2);}
int opterr = 1;
int optind = 1;
int optopt;
char *optarg;
int
getopt(argc, argv, opts)
int argc;
char **argv, *opts;
{
static int sp = 1;
register int c;
register char *cp;
if(sp == 1)
if(optind >= argc ||
argv[optind][0] != '-' || argv[optind][1] == '\0')
return(EOF);
else if(strcmp(argv[optind], "--") == NULL) {
optind++;
return(EOF);
}
optopt = c = argv[optind][sp];
if(c == ':' || (cp=strchr(opts, c)) == NULL) {
ERR(": illegal option -- ", c);
if(argv[optind][++sp] == '\0') {
optind++;
sp = 1;
}
return('?');
}
if(*++cp == ':') {
if(argv[optind][sp+1] != '\0')
optarg = &argv[optind++][sp+1];
else if(++optind >= argc) {
ERR(": option requires an argument -- ", c);
sp = 1;
return('?');
} else
optarg = argv[optind++];
sp = 1;
} else {
if(argv[optind][++sp] == '\0') {
sp = 1;
optind++;
}
optarg = NULL;
}
return(c);
}
#endif /* __GNUC__ */
...
one more tip,
If you want to input argument values in the VS tools, you can input in here, -> property -> debug -> command argument
refer to this image~~
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