boost之program_options库，解析命令行参数、读取配置文件

时间：2014-08-12 00:32:53 阅读：358 评论：0 收藏：0 [点我收藏+]

标签：des blog http os io strong 文件 for

一、命令行解析

tprogram_options解析命令行参数示例代码：

[cpp] view plain copy

#include <iostream>
using namespace std;
#include <boost/program_options.hpp>
namespace po = boost::program_options;
int main(int argc, char*argv[])
{
//int level;
po::options_description desc("Allowed options");
desc.add_options()
("help", "produce help message")
//("help,h", "produce help message")
("compression", po::value<int>(), "set compression level");
//("compression", po::value<int>(&level)->default_value(1), "set compression level");
po::variables_map vm;
po::store(po::parse_command_line(argc, argv, desc), vm);
po::notify(vm);
if(vm.count("help"))
{
cout<<desc<<endl;
return 1;
}
if(vm.count("compression"))
{
cout<<"compression level was set to "<<vm["compression"].as<int>()<<"."<<endl;
//cout<<"compression level: "<<level<<endl;
}
else
{
cout<<"compression level was not set."<<endl;
}
return 0;
}

运行结果：

输入参数：--help

bubuko.com,布布扣

输入参数：--compression 10

bubuko.com,布布扣

二、读取配置文件（Linux、Windows均可）

2.1 代码

[cpp] view plain copy

#include <fstream>
#include <map>
using namespace std;
#include <boost/program_options.hpp>
using namespace boost;
namespace po = boost::program_options;
#ifdef WIN32
#include "C:\Users\gwy8868\Desktop\fast_dr302\fast_dr302\global\xtokens.h"
#else
#include "/opt/guowenyan/fast_dr302/global/xtokens.h"
#endif
std::pair<std::string, std::string> at_option_parser(std::string const& s)
{
if (‘@‘ == s[0])
{
return make_pair(std::string("config"), s.substr(1));
}
else
{
return std::pair<std::string, std::string>();
}
}
int main(int argc, char*argv[])
{
//
string host_ip;
short host_port;
string server_ip;
short server_port;
//
po::options_description hostoptions("host options");
hostoptions.add_options()
("host_ip,H", po::value<string>(&host_ip), "set db_host")
("host_port,P", po::value<short>(&host_port)->default_value(3306), "set db_port");
po::options_description general("general options");
general.add_options()
("help,h", "produce help message")
("server_ip,s", po::value<string>(&server_ip), "set the http_server‘s ip. e.g. ‘202.106.0.20‘")
("server_port,p", po::value<short>(&server_port)->default_value(80), "set the http_server‘s port. default:80");
string config_file;
po::options_description config("config options");
config.add_options()
("config", po::value<string>(&config_file)->default_value("config.conf"),
"set config file, specified with ‘@name‘ too");
po::options_description all("All options");
all.add(hostoptions).add(general).add(config);
po::variables_map vm;
po::store(po::command_line_parser(argc, argv).options(all).extra_parser(::at_option_parser).run(), vm);
if (vm.count("help"))
{
cout << hostoptions <<endl;
cout << general << endl;
cout << config << endl;
return false;
}
if (vm.count("config"))
{
string conf_name = vm["config"].as<string>();
ifstream ifs_config(conf_name.c_str());
if (! ifs_config)
{
cerr << "could not open the configure file" << endl;
return false;
}
stringstream ss_config;
ss_config << ifs_config.rdbuf();
global::strings_t args;
global::separate_tokens(ss_config.str(), args, " \r\n");
po::store(po::command_line_parser(args).options(all).run(), vm);
}
po::notify(vm);
//
cout<<"host_ip: "<<host_ip<<endl;
cout<<"host_port: "<<host_port<<endl;
cout<<"server_ip: "<<server_ip<<endl;
cout<<"server_port: "<<server_port<<endl;
return 0;
}