[c++实践]01-参数解析

#include 
#include 
#include 
#include 



struct DataRouterCfg
{
    uint32_t sd_ttl_ms{300};    // someip的ttl，默认300ms
    int32_t systick_us{0}; // 用于设置系统的滴答时间，单位微秒
    int64_t delay_time_us{1000}; // 延时时间，单位us
};


void datarouter_usage(const std::string &error_msg)
{
    std::stringstream ss;
    ss << error_msg << std::endl;
    ss << "Options:" << std::endl;
    ss << "ttl:       set someip ttl in ms,default 300ms" << std::endl;
    ss << "systick:   set QNX sys tick in us,default 0, which means not use ClockPeriod to set sys tick" << std::endl;
    ss << "tp_delay:  set TP delay in us,default 1000" << std::endl;
    ss << "help:      print this message" << std::endl;
    ss << "example 1:DataRouter ttl 5" << std::endl;
    ss << "example 2:DataRouter systick 100 tp_delay 1000" << std::endl;
    ss << "example 3:DataRouter help" << std::endl;
    std::cout << ss.str();
}



void parse_cmd(int argc, char* argv[],DataRouterCfg &cfg)
{
    for (int i = 1; i < argc; i++)
    {
        const std::string cmd(argv[i]);
        if (cmd == "help" || i >= argc)
        {
            datarouter_usage("");
            exit(1);
        }


        if (cmd == "ttl")
        {        
            std::string value(argv[i+1]);
            i++;
            cfg.sd_ttl_ms = std::stoi(value);
        }
        else if (cmd == "systick")
        {        
            std::string value(argv[i+1]);
            i++;
            cfg.systick_us = std::stoi(value);
        }
        else if (cmd == "tp_delay")
        {        
            std::string value(argv[i+1]);
            i++;
            cfg.delay_time_us = std::stoi(value);
        }
        else 
        {
            datarouter_usage("Unknown Option");
            exit(1);
        }
    }
    return;
}


int main(int argc,char **argv) 
{    
    DataRouterCfg cfg;
    parse_cmd(argc,argv,cfg);
    std::cout << "cfg.delay_time_us:" << cfg.delay_time_us << std::endl;
    std::cout << "cfg.sd_ttl_ms:" << cfg.sd_ttl_ms << std::endl;
    std::cout << "cfg.systick_us:" << cfg.systick_us << std::endl;
    return 0;
}