很实用的C++ ini解析类

头文件：

#pragma once#include <map>#include <string>class INIReader{public:INIReader(std::string filename);INIReader(const char* buf);intParseError();std::stringGet(std::string section, std::string name, std::string default_value);longGetInteger(std::string section, std::string name, long default_value);doubleGetReal(std::string section, std::string name, double default_value);boolGetBoolean(std::string section, std::string name, bool default_value);private:static std::string MakeKey(std::string section, std::string name);static int ValueHandler(void* user, const char* section, const char* name, const char* value);private:int_error;std::map<std::string, std::string> _values;};

cpp文件：

// Read an INI file into easy-to-access name/value pairs.#include "StdAfx.h"#include "INIReader.h"#include <algorithm>#include <cctype>#include <cstdlib>#include "ini.h"INIReader::INIReader(std::string filename){_error = ini_parse(filename.c_str(), ValueHandler, this);}INIReader::INIReader(const char* buf){_error = ini_parse_mem(buf, ValueHandler, this);}int INIReader::ParseError(){return _error;}std::string INIReader::Get(std::string section, std::string name, std::string default_value){std::string key = MakeKey(section, name);return _values.count(key) ? _values[key] : default_value;}long INIReader::GetInteger(std::string section, std::string name, long default_value){std::string valstr = Get(section, name, "");const char* value = valstr.c_str();char* end;// This parses "1234" (decimal) and also "0x4D2" (hex)long n = strtol(value, &end, 0);return end > value ? n : default_value;}double INIReader::GetReal(std::string section, std::string name, double default_value){std::string valstr = Get(section, name, "");const char* value = valstr.c_str();char* end;double n = strtod(value, &end);return end > value ? n : default_value;}bool INIReader::GetBoolean(std::string section, std::string name, bool default_value){std::string valstr = Get(section, name, "");// Convert to lower case to make string comparisons case-insensitivestd::transform(valstr.begin(), valstr.end(), valstr.begin(), ::tolower);if (valstr == "true" || valstr == "yes" || valstr == "on" || valstr == "1")return true;else if (valstr == "false" || valstr == "no" || valstr == "off" || valstr == "0")return false;elsereturn default_value;}std::string INIReader::MakeKey(std::string section, std::string name){std::string key = section + "." + name;// Convert to lower case to make section/name lookups case-insensitivestd::transform(key.begin(), key.end(), key.begin(), ::tolower);return key;}int INIReader::ValueHandler(void* user, const char* section, const char* name, const char* value){INIReader* reader = (INIReader*)user;std::string key = MakeKey(section, name);if (reader->_values[key].size() > 0)reader->_values[key] += "\n";reader->_values[key] += value;return 1;}

依赖于google上的开源项目：inih(http://code.google.com/p/inih/)

头文件：

/* inih -- simple .INI file parserinih is released under the New BSD license (see LICENSE.txt). Go to the projecthome page for more info:http://code.google.com/p/inih/*/#ifndef __INI_H__#define __INI_H__/* Make this header file easier to include in C++ code */#ifdef __cplusplusextern "C" {#endif#include <stdio.h>/* Parse given INI-style file. May have [section]s, name=value pairs   (whitespace stripped), and comments starting with ';' (semicolon). Section   is "" if name=value pair parsed before any section heading. name:value   pairs are also supported as a concession to Python's ConfigParser.   For each name=value pair parsed, call handler function with given user   pointer as well as section, name, and value (data only valid for duration   of handler call). Handler should return nonzero on success, zero on error.   Returns 0 on success, line number of first error on parse error (doesn't   stop on first error), -1 on file open error, or -2 on memory allocation   error (only when INI_USE_STACK is zero).*/int ini_parse(const char* filename,              int (*handler)(void* user, const char* section,                             const char* name, const char* value),              void* user);/* Same as ini_parse(), but takes a FILE* instead of filename. This doesn't   close the file when it's finished -- the caller must do that. */int ini_parse_file(FILE* file,                   int (*handler)(void* user, const char* section,                                  const char* name, const char* value),                   void* user);int ini_parse_mem(const char* buf,              int (*handler)(void* user, const char* section,                             const char* name, const char* value),              void* user);/* Nonzero to allow multi-line value parsing, in the style of Python's   ConfigParser. If allowed, ini_parse() will call the handler with the same   name for each subsequent line parsed. */#ifndef INI_ALLOW_MULTILINE#define INI_ALLOW_MULTILINE 1#endif/* Nonzero to allow a UTF-8 BOM sequence (0xEF 0xBB 0xBF) at the start of   the file. See http://code.google.com/p/inih/issues/detail?id=21 */#ifndef INI_ALLOW_BOM#define INI_ALLOW_BOM 1#endif/* Nonzero to use stack, zero to use heap (malloc/free). */#ifndef INI_USE_STACK#define INI_USE_STACK 1#endif/* Maximum line length for any line in INI file. */#ifndef INI_MAX_LINE#define INI_MAX_LINE 20000#endif#ifdef __cplusplus}#endif#endif /* __INI_H__ */

.c文件：

#define _CRT_SECURE_NO_WARNINGS#pragma warning (disable: 4127)#include <stdio.h>#include <ctype.h>#include <string.h>#include "ini.h"#if !INI_USE_STACK#include <stdlib.h>#endif#define MAX_SECTION 50#define MAX_NAME 50/* Strip whitespace chars off end of given string, in place. Return s. */static char* rstrip(char* s){    char* p = s + strlen(s);    while (p > s && isspace((unsigned char)(*--p)))        *p = '\0';    return s;}/* Return pointer to first non-whitespace char in given string. */static char* lskip(const char* s){    while (*s && isspace((unsigned char)(*s)))        s++;    return (char*)s;}/* Return pointer to first char c or ';' comment in given string, or pointer to   null at end of string if neither found. ';' must be prefixed by a whitespace   character to register as a comment. */static char* find_char_or_comment(const char* s, char c){    int was_whitespace = 0;    while (*s && *s != c && !(was_whitespace && *s == ';')) {        was_whitespace = isspace((unsigned char)(*s));        s++;    }    return (char*)s;}/* Version of strncpy that ensures dest (size bytes) is null-terminated. */static char* strncpy0(char* dest, const char* src, size_t size){    strncpy(dest, src, size);    dest[size - 1] = '\0';    return dest;}/* See documentation in header file. */int ini_parse_file(FILE* file,                   int (*handler)(void*, const char*, const char*,                                  const char*),                   void* user){    /* Uses a fair bit of stack (use heap instead if you need to) */#if INI_USE_STACK    char line[INI_MAX_LINE];#else    char* line;#endif    char section[MAX_SECTION] = "";    char prev_name[MAX_NAME] = "";    char* start;    char* end;    char* name;    char* value;    int lineno = 0;    int error = 0;#if !INI_USE_STACK    line = (char*)malloc(INI_MAX_LINE);    if (!line) {        return -2;    }#endif    /* Scan through file line by line */    while (fgets(line, INI_MAX_LINE, file) != NULL) {        lineno++;        start = line;#if INI_ALLOW_BOM        if (lineno == 1 && (unsigned char)start[0] == 0xEF &&                           (unsigned char)start[1] == 0xBB &&                           (unsigned char)start[2] == 0xBF) {            start += 3;        }#endif        start = lskip(rstrip(start));        if (*start == ';' || *start == '#') {            /* Per Python ConfigParser, allow '#' comments at start of line */        }#if INI_ALLOW_MULTILINE        else if (*prev_name && *start && start > line) {            /* Non-black line with leading whitespace, treat as continuation               of previous name's value (as per Python ConfigParser). */            if (!handler(user, section, prev_name, start) && !error)                error = lineno;        }#endif        else if (*start == '[') {            /* A "[section]" line */            end = find_char_or_comment(start + 1, ']');            if (*end == ']') {                *end = '\0';                strncpy0(section, start + 1, sizeof(section));                *prev_name = '\0';            }            else if (!error) {                /* No ']' found on section line */                error = lineno;            }        }        else if (*start && *start != ';') {            /* Not a comment, must be a name[=:]value pair */            end = find_char_or_comment(start, '=');            if (*end != '=') {                end = find_char_or_comment(start, ':');            }            if (*end == '=' || *end == ':') {                *end = '\0';                name = rstrip(start);                value = lskip(end + 1);                end = find_char_or_comment(value, '\0');                if (*end == ';')                    *end = '\0';                rstrip(value);                /* Valid name[=:]value pair found, call handler */                strncpy0(prev_name, name, sizeof(prev_name));                if (!handler(user, section, name, value) && !error)                    error = lineno;            }            else if (!error) {                /* No '=' or ':' found on name[=:]value line */                error = lineno;            }        }    }#if !INI_USE_STACK    free(line);#endif    return error;}int ini_parse_mem(const char* buf,              int (*handler)(void* user, const char* section,                             const char* name, const char* value),              void* user){char* bufptr = (char*)buf;    /* Uses a fair bit of stack (use heap instead if you need to) */#if INI_USE_STACK    char line[INI_MAX_LINE];#else    char* line;#endif    char section[MAX_SECTION] = "";    char prev_name[MAX_NAME] = "";    char* start;    char* end;    char* name;    char* value;    int lineno = 0;    int error = 0;#if !INI_USE_STACK    line = (char*)malloc(INI_MAX_LINE);    if (!line) {        return -2;    }#endifwhile (1){int ncount = 0;while (*bufptr != '\0'){if (*bufptr == '\r' || *bufptr == '\n')break;line[ncount] = *bufptr ++;ncount ++;}while (*bufptr == '\r' || *bufptr == '\n') bufptr ++;line[ncount] = 0;if (ncount == 0)break;    /* Scan through file line by line */    //while (fgets(line, INI_MAX_LINE, file) != NULL) {        lineno++;        start = line;#if INI_ALLOW_BOM        if (lineno == 1 && (unsigned char)start[0] == 0xEF &&                           (unsigned char)start[1] == 0xBB &&                           (unsigned char)start[2] == 0xBF) {            start += 3;        }#endif        start = lskip(rstrip(start));        if (*start == ';' || *start == '#') {            /* Per Python ConfigParser, allow '#' comments at start of line */        }#if INI_ALLOW_MULTILINE        else if (*prev_name && *start && start > line) {            /* Non-black line with leading whitespace, treat as continuation               of previous name's value (as per Python ConfigParser). */            if (!handler(user, section, prev_name, start) && !error)                error = lineno;        }#endif        else if (*start == '[') {            /* A "[section]" line */            end = find_char_or_comment(start + 1, ']');            if (*end == ']') {                *end = '\0';                strncpy0(section, start + 1, sizeof(section));                *prev_name = '\0';            }            else if (!error) {                /* No ']' found on section line */                error = lineno;            }        }        else if (*start && *start != ';') {            /* Not a comment, must be a name[=:]value pair */            end = find_char_or_comment(start, '=');            if (*end != '=') {                end = find_char_or_comment(start, ':');            }            if (*end == '=' || *end == ':') {                *end = '\0';                name = rstrip(start);                value = lskip(end + 1);                end = find_char_or_comment(value, '\0');                if (*end == ';')                    *end = '\0';                rstrip(value);                /* Valid name[=:]value pair found, call handler */                strncpy0(prev_name, name, sizeof(prev_name));                if (!handler(user, section, name, value) && !error)                    error = lineno;            }            else if (!error) {                /* No '=' or ':' found on name[=:]value line */                error = lineno;            }        }    }#if !INI_USE_STACK    free(line);#endif    return error;}/* See documentation in header file. */int ini_parse(const char* filename,              int (*handler)(void*, const char*, const char*, const char*),              void* user){    FILE* file;    int error;    file = fopen(filename, "r");    if (!file)        return -1;    error = ini_parse_file(file, handler, user);    fclose(file);    return error;}