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boost 操作系统相关的库- program_options系统 (命令行,配置文件,环境变量中解析)

作者:互联网

program_options具体含义

https://blog.csdn.net/weixin_39766005/article/details/121790676

以下功能:

 首先从命令行解析,如果没有设置,则从配置文件中解析,如果配置文件也没设置,则从环境变量中解析

#include<iostream>
#include<cstdlib>
#include<string>
#include<vector>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <boost/filesystem.hpp>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <signal.h>
#include <typeinfo>
#include <algorithm>
#include <list>
#include <set>
#include <future>
using namespace std;
#include<iostream>
#include<thread>
#include <mutex>
#include <signal.h>
#include <fstream>
#include <condition_variable>
#include <ctime>
#include <iostream>
#include <string>
#include <iostream>
#include <boost/array.hpp>
#include <boost/asio.hpp>
#include <boost/asio.hpp>
#include <signal.h>
#include <boost/optional.hpp>
#include <bits/stdc++.h>
#include <boost/optional.hpp>
#include <iterator>
#include <boost/program_options.hpp>using namespace std;
using namespace boost::filesystem;
namespace po=boost::program_options;
int main(int argc,char* argv[])
{
  po::options_description des("add option:");
  des.add_options()
  ("help,h","show some help info")
  ("vesion,v","show version info")
  ("size,s",po::value<int>(),"show size info")
  ("method,m",po::value<std::string>()->default_value("GET"),"show method...")
  ("config,f",po::value<std::string>()->default_value("test.ini"),"set config file");
  po::options_description hide("show hide");
  hide.add_options()
  ("filename,f",po::value<std::vector<std::string>>(),"all filename");//需要设置多个则设置类型保存为vector即可
  po::options_description all;
  all.add(des).add(hide);//隐藏filename的帮助信息
  po::positional_options_description pos_de;
  pos_de.add("filename",-1);//位置选项设置为-1,表示所有无选项的都作为filename
  po::variables_map vm;
  try
  {
    /* code */
//从命令行解析 auto parse_base=po::command_line_parser(argc,argv).options(all).positional(pos_de).run(); po::store(parse_base,vm); } catch(const std::exception& e) { std::cerr << e.what() << '\n'; } //config 从配置文件中读取,vm中key一旦设置,后续设置无效 auto config_file=vm["config"].as<std::string>(); //check config_file exist TODO po::options_description _config; _config.add_options() ("size,-s",po::value<int>(),"show size info"); po::store(po::parse_config_file<char>(config_file.c_str(),_config),vm); //env 从环境变量中读取读取 export TEST_SIZE=1234 ,前提之前未设置过size po::options_description env_des; env_des.add_options() ("size,-s",po::value<int>(),"show size info") ("method,m",po::value<std::string>()->default_value("GET"),"show method..."); po::store(po::parse_environment(env_des,[](const string& env_name) { std::map<std::string,std::string> _env_map{{"TEST_SIZE","size"},{"TEST_METHOD","method"}}; return _env_map[env_name]; }),vm); vm.notify(); if(argc<2 || vm.count("help")==1) { cout<<des<<endl; return 1; } if(vm.count("version")==1) { cout<<"version 1.0"<<endl; return 1; } if(vm.count("size")==1) { cout<<"size:"<<vm["size"].as<int>()<<endl; } else { cout<<"--size no invalid"<<endl; return 1; } if(vm.count("method")==1) { cout<<"method:"<<vm["method"].as<std::string>()<<endl; } if(vm.count("filename")==1) { cout<<"filename:"; for(auto& file:vm["filename"].as<std::vector<std::string>>()) { cout<<file<<endl; } } return 0; }

 

标签:配置文件,show,value,options,add,program,include,boost,po
来源: https://www.cnblogs.com/bwbfight/p/15893701.html