#define no_argument        0

#define required_argument  1

#define optional_argument  2

struct option {

   const char *name;   //名称,下面实例中使用的--help，--version

   int has_arg;        //是否有参数,可选0,1,2三个值，就是上面的那三个宏定义

   int *flag;          //返回值，传入的一个int指针，表示该参数的解析结果，如果是NULL，那么返回值就会被写到getopt_long的返回值中。

   int val;            //name的简写

};

#include <unistd.h>

int getopt(int argc, char * const argv[],const char *optstring);

extern char *optarg;

extern int optind, opterr, optopt;

#include <getopt.h>

    int getopt_long(int argc, char * const argv[],

    const char *optstring,

    const struct option *longopts,

    int *longindex);

int getopt_long_only(int argc, char * const argv[],

    const char *optstring,

    const struct option *longopts,

    int *longindex);

#include <getopt.h>

#include <stdio.h>

#include <stdlib.h>

#include <iostream>

using namespace std;

int discovery_options(int argc, char** argv, bool& show_help, bool& show_version,string& input)

{

    int ret = ;

    static option long_options[] = {

        {"help", no_argument, &ret, 'h'},

        {"version", no_argument, , 'v'},

        {"arga", required_argument , , 'a'},

        {"argb", required_argument , , 'b'},

        {, , , }

    };

    int opt = ;

    int option_index = ;

    while((opt = getopt_long(argc, argv, "hva:b:", long_options, &option_index)) != -){

        switch(opt){

        case 'h':

                show_help = true;

                break;

        case 'v':

                show_version = true;

                break;

        case 'a':

                input = optarg;

                break;

        case 'b':

                input = optarg;

                break;

            default:

                show_help = true;

                break;

        }

    }

    // check values

    return ret;

}

void help(char** argv){

    printf("%s, Copyright (c) 2013-2015 BuguTian\n", argv[]);

    printf(""

        "Usage: %s <Options> <-a REQUEST>\n"

        "-h no arg,mean help\n"

        "-v no arg,mean version\n"

        "-a arga\n"

        "-b argb\n",

        argv[]);

    exit();

}

void version()

{

    printf("V1.1.1\n");

    exit();

}

int main(int argc, char** argv){

    int ret = ;

    bool show_help = false;

    bool show_version = false;

    string input="";

    if((ret = discovery_options(argc, argv, show_help, show_version, input))){

        printf("discovery options failed. ret=%d", ret);

        return ret;

    }

    if(show_help){

        help(argv);

    }

    if(show_version){

        version();

    }

    printf("running...\n");

    return ;

}