简单的INI解析器

 

小的ini解析器，缩进……

 

ini_parser.cpp

/*** 作者： 王政杰* 日期： 2011.3.16* 功能描述： ini文件解析器的具体实现*可以读取文件，并装入map结构中，供用户调用。**存储方式，section == map<string ,key> * key == map<string ,string>*/#include "ini_parser.h"namespace my_ini {static const char left_tag= '[';static const char right_tag= ']';static const char equal= '=';static const char cr= '/r';static const char new_line= '/n';static const char* empty_str= " ";static const char comment_tag= ';';ini_parser::ini_parser () : m_modified(false){}ini_parser::ini_parser (const char* file_name) : m_modified(false){load(file_name);}ini_parser::~ini_parser (){if (m_modified)save();}void ini_parser::save_before_load(){if (m_modified)save();m_file_name.resize(0);m_section.clear();m_modified = false;}/**读取 文件file_name***/bool ini_parser::load(const char* file_name){save_before_load ();ifstream in_file (file_name);if (in_file == NULL){return false;}in_file.seekg (0, ios::end);/**file.seekg(0,ios::beg); // 让文件指针定位到文件开头*file.seekg(0,ios::end); // 让文件指针定位到文件末尾*file.seekg(10,ios::cur); // 让文件指针从当前位置向文件末方向移动10个字节*file.seekg(-10,ios::cur); // 让文件指针从当前位置向文件开始方向移动10个字节*file.seekg(10,ios::beg); // 让文件指针定位到离文件开头10个字节的位置*/long len = in_file.tellg();if (len < 0){return false;}char* buffer = new char[len + 1];for(int i = 0; i<= len; i++){buffer[i] = 0;}if (buffer == NULL){return false;}in_file.seekg(0, ios::beg);in_file.read(buffer, len);buffer[len = in_file.gcount()] = 0;//gcount() 用于统计读入的字节数load_into_section (buffer, len);m_file_name = file_name;delete[] buffer;return true;}/**对缓冲区内容进行解析，并存入map中***/bool ini_parser::load_into_section (const char* buffer, long len){const char*p= NULL;const char*key_begin= NULL;const char*section_begin = NULL;const char*value_begin= NULL;const char*comment_begin = NULL;stringcomment;stringsec;stringkey;enum _STATUS{STAT_NONE,STAT_SECTION,STAT_KEY,STAT_VALUE,STAT_COMMENT}state = STAT_NONE;for( p = buffer; *p != 0; p++){switch( state ){case STAT_NONE:{if( *p == left_tag){state = STAT_SECTION;section_begin = p + 1;} else if( *p == comment_tag) {state= STAT_COMMENT;comment_begin= p + 1;} else if( !isspace(*p)){state= STAT_KEY;key_begin= p;}break;}case STAT_SECTION:{if ( *p == right_tag){state= STAT_NONE;sec = string(section_begin, p - section_begin);strtrim (sec);}break;}case STAT_KEY:{if ( *p == equal ){state = STAT_VALUE;key = string(key_begin, p - key_begin);strtrim(key);value_begin = p+1;}break;}case STAT_VALUE:{if ( *p == new_line || *p == cr){state = STAT_NONE;m_section[sec][key] = string(value_begin, p - value_begin);//m_section[sec] = key_value(key, string(value_begin, p - value_begin));}break;}case STAT_COMMENT:{if ( *p == new_line || *p == cr){state = STAT_NONE;comment = string(comment_begin, p - comment_begin);strtrim( comment );m_comment.push_back( comment );}break;}}}return 0;}/** 去除字符串首尾的空格***/string ini_parser::strtrim (string &str){ str.erase(str.find_last_not_of(" ")+1); str.erase(0,str.find_first_not_of(" "));return str;}bool ini_parser::save(){if(0 == m_file_name.c_str() || 0 == m_file_name[0]){return false;}ofstream out_file(m_file_name.c_str());if(!out_file){return false;}for(section_iterator it_section = m_section.begin(); it_section != m_section.end(); it_section ++){out_file << left_tag << it_section->first << right_tag << endl;for( key_iterator it_key = it_section->second.begin(); it_key != it_section->second.end();it_key ++){out_file << it_key->first << equal << it_key->second << endl;}out_file << endl;}m_modified = false;}/***获取 某个section 某个key 所对应的值**/const char* ini_parser::get_key_value(const char* sec, const char* key){section_iterator it_section = m_section.find(sec);if(m_section.end() != it_section){key_iterator it_key = it_section->second.find(key);if(it_key != it_section->second.end())return it_key->second.c_str();}return 0;}/***修改 某个section 某个key所对应的值**/void ini_parser::set_string(const char* sec, const char* key, const char* value){m_section[sec][key] = value;m_modified = true;}/***以int类型来读取**/int ini_parser::get_int(const char* sec, const char* key, int def_val){istrstream( get_key_value(sec, key)) >> def_val;return def_val;}/***以float类型来读取**/float ini_parser::get_float(const char* sec, const char* key, float def_val){istrstream(get_key_value(sec, key)) >> def_val;return def_val;}string ini_parser::get_string (const char* sec, const char* key){return get_key_value(sec, key);}void ini_parser::set_int(const char* sec, const char* key, int value){char buffer[BUFFER_LEN + 1] = {0};ostrstream ostr(buffer, BUFFER_LEN);ostr << value;buffer[ostr.pcount()] = 0;set_string(sec, key, buffer);}void ini_parser::set_float(const char* sec, const char* key, float value){char buffer[BUFFER_LEN + 1] = {0};ostrstream ostr(buffer, BUFFER_LEN);ostr << value;set_string(sec, key, buffer);}}

 

ini_parser.h

 

/*** 作者： 王政杰* 日期： 2011.3.16* 功能描述： ini文件解析器的具体实现*可以读取文件，并装入map结构中，供用户调用。****/#ifndef INI_PARSER_H#define INI_PARSER_H#include <map>#include <vector>#include <string>#include <fstream>#include <strstream>using namespace std;#define BUFFER_LEN 255namespace my_ini{class ini_parser{public:typedef std::map<std::string, std::string> key_value;typedef std::map<std::string, key_value> section;typedef key_value::iteratorkey_iterator;typedef section::iteratorsection_iterator;typedef vector<std::string>comment;public:ini_parser ();ini_parser (const char* file_name);~ini_parser ();void save_before_load ();bool load_into_section (const char* buffer, long len);bool load (const char* file_name);bool save ();bool isModified () const {return m_modified;}string strtrim (string & str);public:const char* get_key_value(const char* sec, const char* key);int get_int(const char* sec, const char* key, int def_val);float get_float(const char* sec, const char* key, float def_val);string get_string (const char* sec, const char* key);void set_int(const char* sec, const char* key, int value);void set_float (const char* sec, const char* key, float value);void set_string (const char* sec, const char* key, const char* value);private:boolm_modified;sectionm_section;std::string m_file_name;commentm_comment;};}#endif 

 

 

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