在C++中从命令行处理参数的最有效方法

#include<iostream>

int main(int argc, char *argv[]) {
    std::cout << "命令行参数数量: "<< argc<< std::endl;
    std::cout << "程序名称: "<< argv[0]<< std::endl;

    for (int i = 1; i < argc; ++i) {
        std::cout << "参数 " << i << ": "<< argv[i]<< std::endl;
    }

    return 0;
}

#include<iostream>
#include<boost/program_options.hpp>

int main(int argc, char *argv[]) {
    try {
        std::string input_file;
        int output_format;

        boost::program_options::options_description desc("Allowed options");
        desc.add_options()
            ("help", "produce help message")
            ("input-file", boost::program_options::value<std::string>(&input_file), "input file")
            ("output-format", boost::program_options::value<int>(&output_format)->default_value(0), "output format");

        boost::program_options::variables_map vm;
        boost::program_options::store(boost::program_options::parse_command_line(argc, argv, desc), vm);
        boost::program_options::notify(vm);

        if (vm.count("help")) {
            std::cout<< desc<< std::endl;
            return 0;
        }

        std::cout << "Input file: "<< input_file<< std::endl;
        std::cout << "Output format: "<< output_format<< std::endl;
    } catch (std::exception &e) {
        std::cerr << "Error: " << e.what()<< std::endl;
        return 1;
    } catch (...) {
        std::cerr << "Unknown error"<< std::endl;
        return 1;
    }

    return 0;
}