Linux 解析命令行参数

前言

        本章以代码形式提供命令行解析Demo,虽然解析形式有千万种，但我最中这一种啊。其实是在阅读源码时候看到的，我就给提出来了。

代码

#include   


std::atomic g_msgCount(1);

class Args 
{
public:
    Args()
        : body("msgbody for test"),
          thread_count(std::thread::hardware_concurrency()),
          broadcasting(false),
          syncpush(false),
          SelectUnactiveBroker(false),
          IsAutoDeleteSendCallback(false),
          retrytimes(5),
          PrintMoreInfo(false) {}
    
public:
    std::string namesrv;
    std::string namesrv_domain;
    std::string groupname;
    std::string topic;
    std::string body;
    int thread_count;
    bool broadcasting;
    bool syncpush;
    bool SelectUnactiveBroker;  // default select active broker
    bool IsAutoDeleteSendCallback;
    int retrytimes;  // default retry 5 times;
    bool PrintMoreInfo;
};

static bool ParseArgs(int argc, char* argv[], Args* info);
int main(int argc, char* argv[])
{
    Args info;
    
    if (!ParseArgs(argc, argv, &info)) 
    {
        exit(-1);
    }
    ...
}

static bool ParseArgs(int argc, char* argv[], Args* info) 
{
    int ch;
    while ((ch = getopt(argc, argv, "n:i:g:t:m:c:b:s:h:r:T:bu")) != -1) 
    {
        switch (ch) {
        case 'n':
            info->namesrv.insert(0, optarg);
            break;
        case 'i':
            info->namesrv_domain.insert(0, optarg);
            break;
        case 'g':
            info->groupname.insert(0, optarg);
            break;
        case 't':
            info->topic.insert(0, optarg);
            break;
        case 'm':
            g_msgCount.store(atoi(optarg));    // atomic 赋值方式
            break;
        case 'c':
            info->body.insert(0, optarg);
            break;
        case 'b':
            info->broadcasting = true;
            break;
        case 's':
            info->syncpush = true;
            break;
        case 'r':
            info->retrytimes = atoi(optarg);
            break;
        case 'u':
            info->SelectUnactiveBroker = true;
            break;
        case 'T':
            info->thread_count = atoi(optarg);
            break;
        case 'v':
            info->PrintMoreInfo = true;
            break;
        case 'h':
            help();
            return false;
        default:
            help();
            return false;
        }
    }
    
    if (info->groupname.empty() || info->topic.empty() || (info->namesrv_domain.empty() && info->namesrv.empty())) 
    {
        std::cout << "please use -g to setup groupname and -t setup topic \n";
        help();
        return false;
    }
    return true;
}