ini文件读写，适合大量输出。

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在开源中国上找到的，原地址http://www.oschina.net/code/snippet_553781_37613。

原简介：

1、适用于C++项目，适用于Windows和Linux平台，依赖STL标准库。
2、用于C++读取INI文件，写入INI文件，以及查找相应键值对的快速操作。
3、在项目中需要此功能时，只需要引入两个文件，即：INIParser.h和INIParser.cpp。
4、main.c文件有例程，同时附带makefile，以及测试使用的conf.ini和生成的test.ini文件。

所做修改：

1.修复了读取时，不同段下会出现键值对重复的bug。

2.取消了空格消除。

3.不采用map格式输出，保证输出顺序即为写入顺序。

INIParser.h

#ifndef INI_PARSER_H#define INI_PARSER_H#include <iostream>#include <fstream>#include <sstream>#include <vector>#include <cstdlib>#include <map>using namespace std;typedef std::pair<string,string> MyTypeSub;typedef std::vector<MyTypeSub> MyVectorSub;class ININode{public:    ININode(string root, string key, string value)    {        this->root = root;        this->key = key;        this->value = value;    }    string root;    string key;    string value;};class SubNode{public:    void InsertElement(string key, string value)    {        sub_node.insert(pair<string, string>(key, value));    }std::map<string, string> sub_node;MyVectorSub sub_nodevector;//key名加值};class INIParser{public:    int ReadINI(string path);    string GetValue(string root, string key);    vector<ININode>::size_type GetSize(){return map_ini.size();}    vector<ININode>::size_type SetValue(string root, string key, string value);    int WriteINI(string path);    void Clear(){map_ini.clear();}private:    map<string, SubNode> map_ini;//段名加对象 用于检索  typedef pair<string, SubNode> MyType;  typedef vector<MyType> MyVector; MyVector vector_ini;//用于输出};#endif // INI_PARSER_H

INIParser.cpp

#include "INIParser.h"//remove all blank spacestring & TrimString(string &str){    string::size_type pos = 0;    while(str.npos != (pos = str.find(" ")))        str = str.replace(pos, pos+1, "");    return str;}//read in INI file and parse itint INIParser::ReadINI(string path){    ifstream in_conf_file(path.c_str());    if(!in_conf_file) return 0;    string str_line = "";    string str_root = "";    vector<ININode> vec_ini;    while(getline(in_conf_file, str_line))    {        string::size_type left_pos = 0;        string::size_type right_pos = 0;        string::size_type equal_div_pos = 0;        string str_key = "";        string str_value = "";        if((str_line.npos != (left_pos = str_line.find("["))) && (str_line.npos != (right_pos = str_line.find("]"))))        {            //cout << str_line.substr(left_pos+1, right_pos-1) << endl;            str_root = str_line.substr(left_pos+1, right_pos-1);        }        if(str_line.npos != (equal_div_pos = str_line.find("=")))        {           str_key = str_line.substr(0, equal_div_pos);           str_value = str_line.substr(equal_div_pos+1, str_line.size()-1);           //str_key = TrimString(str_key);           //str_value = TrimString(str_value);           //cout << str_key << "=" << str_value << endl;        }        if((!str_root.empty()) && (!str_key.empty()) )        {           ININode ini_node(str_root, str_key, str_value);           vec_ini.push_back(ini_node);           //cout << vec_ini.size() << endl;        }    }    in_conf_file.close();    in_conf_file.clear();    //vector convert to map    map<string, string> map_tmp;    for(vector<ININode>::iterator itr = vec_ini.begin(); itr != vec_ini.end(); ++itr)    {        map_tmp.insert(pair<string, string>(itr->root, ""));    }    SubNode sn;    for(map<string, string>::iterator itr1 = map_tmp.begin(); itr1 != map_tmp.end(); ++itr1)    {       //cout << itr->first << endl;sn.sub_node.clear();       for(vector<ININode>::iterator sub_itr = vec_ini.begin(); sub_itr != vec_ini.end(); ++sub_itr)       {           if(sub_itr->root == itr1->first)           {               //cout << sub_itr->key << "=" << sub_itr->value << endl;                  sn.InsertElement(sub_itr->key, sub_itr->value);           }       }       map_ini.insert(pair<string, SubNode>(itr1->first, sn));    }for(vector<ININode>::iterator sub_itr2 = vec_ini.begin(); sub_itr2 != vec_ini.end(); ++sub_itr2){SubNode sn2;sn2.sub_nodevector.push_back(pair<string, string>(sub_itr2->key, sub_itr2->value));bool bRootExist=false;for (MyVector::iterator iter2=vector_ini.begin();iter2!=vector_ini.end();++iter2){if (iter2->first==sub_itr2->root){iter2->second.sub_nodevector.push_back(pair<string, string>(sub_itr2->key, sub_itr2->value));bRootExist=true;break;}}if (!bRootExist){vector_ini.push_back(pair<string, SubNode>(sub_itr2->root, sn2));}}    return 1;}//get value by root and keystring INIParser::GetValue(string root, string key){map<string, SubNode>::iterator itr = map_ini.find(root);map<string, string>::iterator sub_itr = itr->second.sub_node.find(key);SubNode& ojb=itr->second;string aa=sub_itr->first;string bb=sub_itr->second;if(!(sub_itr->second).empty())return sub_itr->second;return "";}//write ini fileint INIParser::WriteINI(string path){    ofstream out_conf_file(path.c_str());    if(!out_conf_file)        return -1;//     for(map<string, SubNode>::iterator itr = map_ini.begin(); itr != map_ini.end(); ++itr)//     {//        out_conf_file << "[" << itr->first << "]" << endl;//        for(map<string, string>::iterator sub_itr = itr->second.sub_node.begin(); sub_itr != itr->second.sub_node.end(); ++sub_itr)//        {//            out_conf_file << sub_itr->first << "=" << sub_itr->second << endl;//        }//     }for (MyVector::iterator itervector=vector_ini.begin();itervector!=vector_ini.end();++itervector){out_conf_file << "[" << itervector->first << "]" << endl;for (MyVectorSub::iterator itersub=itervector->second.sub_nodevector.begin();itersub!=itervector->second.sub_nodevector.end();++itersub){out_conf_file << itersub->first << "=" << itersub->second << endl;}}    out_conf_file.close();    out_conf_file.clear();    return 1;}//set valuevector<ININode>::size_type INIParser::SetValue(string root, string key, string value){     map<string, SubNode>::iterator itr = map_ini.find(root);     if(map_ini.end() != itr)         itr->second.sub_node.insert(pair<string, string>(key, value));     else     {         SubNode sn;         sn.InsertElement(key, value);         map_ini.insert(pair<string, SubNode>(root, sn));     }//查找向量里是否有bool find=false;for (MyVector::iterator itervector=vector_ini.begin();itervector!=vector_ini.end();++itervector){if(itervector->first==root){itervector->second.sub_nodevector.push_back(pair<string, string>(key, value));find=true;break;}}if (!find){SubNode sn;sn.sub_nodevector.push_back(pair<string, string>(key, value));vector_ini.push_back(pair<string, SubNode>(root, sn));}return map_ini.size();}

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