C++ hash_map简单应用之解析配置文件

第一次用markdown,二话不说先上代码
环境是centos6.8 编译器gcc 6.10
我是在windows下VS2013下移植过来的,个人感觉两个环境下确实差别挺大的.windows下vs2013下的代码文件,昨天我上传上来了:http://download.csdn.net/detail/sinat_24820331/9729963

下面是linux下的代码

#include<iostream>#include<ext/hash_map>#include<vector>#include<sstream>   #include<fstream>#include<string>std::vector<std::vector<std::string>*>servers;std::vector<std::string>ip;std::vector<std::string>domain;class hm_strcmp{    public:    bool operator()(const std::string& s1,const std::string& s2) const    {        return s1==s2;    }};struct str_hash{    size_t operator()(const std::string &str) const    {        unsigned long __h=0;        for(size_t i=0;i<str.size();i++)        __h=5*__h+str[i];        return size_t(__h);    }};__gnu_cxx::hash_map<std::string, std::vector<std::string>*,str_hash,hm_strcmp> domain_hash;__gnu_cxx::hash_map<std::string, std::vector<std::string>*,str_hash,hm_strcmp> head_hash;__gnu_cxx::hash_map<std::string, std::vector<std::string>*,str_hash,hm_strcmp> rear_hash;class dns_conf {public:    void open_conf_file();    void close_conf_file();    int parse_conf();public:    std::string      cfilename;    std::ifstream    cfilestream;    int          lineNum;    int         block_index;    int  unkown_block_start;};/*传入域名，传出点数，传出标记标记：返回1前缀 返回2后缀 返回0正常返回值：*的位置*/int posAfterStar(const char *str, int &point_num, char &wildcard_flash) {    if (!str) {        return 0;    }    const char *_p = str;    char c = *_p;    int  pos = 0;    point_num = 0;    while (*_p) {        if (c == '*') {            pos = _p + 1 - str;            if (point_num == 0)            {                wildcard_flash = '1';            }            else            {                wildcard_flash = '2';            }        }        else if (c == '.') {            point_num++;        }        _p += 1;        c = *_p;    }    return pos;}void dns_conf::open_conf_file() {    cfilename = "./dns_conf.file";    try    {        cfilestream.open(cfilename);        if (!cfilestream.is_open()) {            //std::cerr << "open " << cfilename << " failed \n";            std::cout << "open err" << std::endl;            std::exit(1);        }        std::cout << "open success" << std::endl;    }    catch (std::exception &e) {        std::cerr << e.what() << std::endl;        std::exit(1);    }}void dns_conf::close_conf_file() {    if (cfilestream.is_open()) {        cfilestream.close();    }}int dns_conf::parse_conf(){    char ch;    int block_begin_num = 0;    int block_end_num = 0;    int ref_num = 0;    std::ostringstream _strline;    int new_flag = 0;    std::vector<std::string>* p=NULL;    while (cfilestream.get(ch)) {        if (ch == '{')            block_begin_num++;        if (ch == '}')            block_end_num++;        if (block_begin_num == 2)//{"111.13.111.233","192.168.1.1"}            //一个servers组开始了，new出vector<string>,地址插入全局中            //ip数据插入到vector<string>中        {            if (new_flag == 0)            {                std::vector<std::string>* new_p = new std::vector < std::string >;                p = new_p;                servers.push_back(p);                new_flag = 1;            }            if (ch == '"')            {                ref_num++;                continue;            }            if (ref_num == 1)                _strline << ch;            if (ref_num == 2)            {                (*p).push_back(_strline.str());                _strline.str("");                ref_num = 0;            }        }        if (block_begin_num == 3)//处理域名        {            if (ch == '"')            {                ref_num++;                continue;            }            if (ref_num == 1)                _strline << ch;            if (ref_num == 2)            {                int pn; char flag = '0';                //_strline << '.';                posAfterStar(_strline.str().c_str(), pn, flag);                if (flag == '0')                {                    //普通                    domain_hash.insert(__gnu_cxx::hash_map<std::string, std::vector<std::string>*>::value_type(_strline.str(), p));                }                else if (flag == '1')                {                    //前缀  //需要去掉前缀的*                     head_hash.insert(__gnu_cxx::hash_map<std::string, std::vector<std::string>*>::value_type(_strline.str().erase(0,1), p));                }                else if (flag == '2')                {                       //后缀  //需要去掉后缀的*                    rear_hash.insert(__gnu_cxx::hash_map<std::string, std::vector<std::string>*>::value_type(_strline.str().substr(0, _strline.str().find("*")), p));                }                domain.push_back(_strline.str());                _strline.str("");                ref_num = 0;            }        }        if (block_end_num == 3)        {            block_begin_num = 0;            block_end_num = 0;            ref_num = 0;            new_flag = 0;            _strline.str("");        }    }    return 0;}int main(){    dns_conf conf;    conf.open_conf_file();    conf.parse_conf();    __gnu_cxx::hash_map<std::string, std::vector<std::string>*>::iterator it;     std::cout<<head_hash.find(".163.com")->second[0][0]<<std::endl;;    if (head_hash.find(".163.com") != head_hash.end())    {        std::cout<<"本ip组中的个数"<<(*(head_hash.find(".163.com")->second)).size()<<std::endl;        std::cout << "找到了" << std::endl;    }    else    {        std::cout << "找不到" << std::endl;    }    return 0;}/*int main2(){    dns_conf conf;    conf.open_conf_file();    conf.parse_conf();    for (std::vector<std::vector<std::string>*>::iterator it = servers.begin(); it != servers.end(); it++)    {        std::cout << "-----" << std::endl;        for (std::vector<std::string>::iterator it1 = (*(*it)).begin(); it1 != (*(*it)).end(); it1++)            std::cout << "ip " << (*it1) << std::endl;    }    for (std::vector<std::string>::iterator it = domain.begin(); it != domain.end(); it++)    {        std::cout << "domain " << *it << std::endl;    }    for (std::hash_map<std::string, std::vector<std::string>*>::iterator it = head_hash.begin(); it != head_hash.end(); it++)    {        std::cout << "head_hash:" << it->first << std::endl;    }    for (std::hash_map<std::string, std::vector<std::string>*>::iterator it = rear_hash.begin(); it != rear_hash.end(); it++)    {        std::cout << "rear_hash:" << it->first << std::endl;    }    std::cout << "*********************" << std::endl;    //std::hash_map<std::string, std::vector<std::string>*> domain_hash;    //std::hash_map<std::string, std::vector<std::string>*>::iterator it = domain_hash.begin();    //std::cout << it->first << std::endl;    std::cout <<domain_hash.size()<< std::endl;    if (domain_hash.find("www.jd.com") != domain_hash.end())    {        std::cout << "找到了" << std::endl;    }    else    {        std::cout << "找不到" << std::endl;    }    system("pause");    return 0;}*/

主要是servers这个hash_map容器.
string用于存储域名,vector* 所指的vector用于保存一个组内的所有ip

配置文件如下,文件名为:dns_conf.file

group{    servers = {"111.13.111.233"},    domains = {            "www.wandoujia.com",            "www.gionee.com",            "www.vip.com",            "*.163.com",            "www.jd.com",        }}group{    servers = {"111.13.111.234"},    domains = {            "1.qtmojo.com",            "a1.alicdn.com",        }}

也算是hash_map的简单应用了
个人感觉还是对 stl有点陌生,仿函数不熟,摸索了大半天,边写边参考.
参考链接为:
http://blog.csdn.net/lile269/article/details/6378083