#define no_argument        0#define required_argument  1#define optional_argument  2struct 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 = 0;        static option long_options[] = {        {"help", no_argument, &ret, ‘h‘},        {"version", no_argument, 0, ‘v‘},        {"arga", required_argument , 0, ‘a‘},        {"argb", required_argument , 0, ‘b‘},        {0, 0, 0, 0}    };        int opt = 0;    int option_index = 0;    while((opt = getopt_long(argc, argv, "hva:b:", long_options, &option_index)) != -1){        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[0]);    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[0]);            exit(0);}void version(){    printf("V1.1.1\n");    exit(0);}int main(int argc, char** argv){    int ret = 0;    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 0;}