C语言读取配置文件

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#语言 #c #fp #file #iostream #null

本文介绍了一个使用C语言实现的配置文件读取方法。通过提供的read_conf.h头文件及配套的源代码，可以轻松地从指定的配置文件中读取特定部分的键值对。示例展示了如何初始化并调用get_key_value函数来获取配置项。

/* C语言读取配置文件 */

/* 调用示例 */

#include "read_conf.h" int main() { //initialization work char demo[max_value]; memset(demo, 0, sizeof(demo)); get_key_value("SECTION_1", "KEY_1", demo, "./config.ini"); //or call the function like this: get_key_value("SECTION_1", "KEY_1", demo); return TRUE; }

/* filename: read_conf.h */

#ifndef _READ_CONF_H_ #define _READ_CONF_H_ /************************************************************************/ /* * name: read_conf.h * creat date: 2010-12-20 * ver: v1.0 author: sarry * email: shiluo.110@163.com * 使用本代码，需包含三个文件到你的工程中： * read_conf.h, read_conf.c, config.ini. * thx2冬眠的猪 */ /************************************************************************/ #include <stdio.h> #include <iostream> //External Interface unsigned int get_key_value(const char* section, const char* key, char* value, const char* file_name = "config.ini"); //Internal Interface unsigned int get_section(FILE* fp, const char* section_name, char* section); unsigned int get_value(char* section, const char* key, char* value); #define TRUE 1 #define FALSE 0 #define max_section 4096 #define max_key 100 #define max_value 100 //#define DEBUG_CONF #endif

/* filename: read_conf.c */

#include "read_conf.h" /************************************************************************/ /* * 对外接口主函数 * section_name:字段名; key:键名; value:存储键值的数组; file_name:配置文件路径及名称 * 成功返回TRUE，失败返回FALSE。 */ /************************************************************************/ unsigned int get_key_value(const char* section_name, const char* key, char* value, const char* file_name) { char section[max_section]; memset(section, 0, max_section); //open config file FILE* fp = NULL; if(NULL == (fp = fopen(file_name, "r"))) { printf("ERROR: open %s failed!/n", file_name); return FALSE; } //get section content if (FALSE == get_section(fp, section_name, section)) { printf("ERROR: can't get content of [%s]!/n", section_name); return FALSE; } #ifdef DEBUG_CONF printf("%s/n", section); #endif //get key value if (FALSE == get_value(section, key, value)) { printf("ERROR: can't get value of key:[%s]!/n", key); return FALSE; } return TRUE; } /************************************************************************/ /* * 将fp所指的文件中字段section_name下的内容复制到section指向的数组中。 * 成功返回TRUE，失败返回FALSE。 */ /************************************************************************/ unsigned int get_section(FILE* fp, const char* section_name, char* section) { if (!fp || !section_name || !section || !strlen(section_name)) { return FALSE; } int cnt_sn_app = 0; //count of section name appeared int f_can_copy = 0; char* cur_copyed = section; char array_need_comp[20]; memset(array_need_comp, 0, sizeof(array_need_comp)); sprintf(array_need_comp, "[%s]", section_name); #define MAX_READ 100 char buf_read_fp[MAX_READ]; while(1) { memset(buf_read_fp, 0, sizeof(buf_read_fp)); if (NULL == fgets(buf_read_fp, MAX_READ, fp)) { break; //文件末尾 } if ((cnt_sn_app == 1) && (buf_read_fp[0] == '[')) { f_can_copy = 0; } if (f_can_copy) { char* cpy = buf_read_fp; while ( (*cpy != '/0') && (*cpy != '#') && (*cpy != '＃') && (*cpy != '/n') && (cpy < buf_read_fp + sizeof(buf_read_fp)) ) { *cur_copyed++ = *cpy++; } } if ((buf_read_fp[0] == '[') && strstr(buf_read_fp, array_need_comp)) { f_can_copy = 1; cnt_sn_app++; //break; //如不需检测字段的重复性，则取消该mask } if (cnt_sn_app > 1) { printf("Error: 字段%s出现了%d次！", section_name, cnt_sn_app); memset(section, 0, cur_copyed - section); return FALSE; } } return TRUE; } /************************************************************************/ /* * 从section中获取key的值并复制到value指向的位置 * 成功返回TRUE，失败返回FALSE。 */ /************************************************************************/ unsigned int get_value(char* section, const char* key, char* value) { if (!section || !key || !value || !strlen(key)) { return FALSE; } unsigned int cnt = 0; unsigned int f_copy = 0; //1,start copy; 0,stop copy. char* pos = strstr(section, key); if (NULL == pos) { return FALSE; } pos += strlen(key); #define start_copy(c) ((c != '/t') && (c != '/n') && (c != ' ') && (c != '=') ) #define stop_copy(c) ((c == ';') || (c == '/n')) while (1) { if (start_copy(*pos)) { f_copy = 1; } if (stop_copy(*pos)) { f_copy = 0; break; } if (f_copy) { value[cnt++] = *pos; } pos++; } return TRUE; }

/* config.ini */

#This the demo of read config file #Config file contains three format: comment(#comment), section([SECTION]), and text(key = value;). #You can use space or tab to keep your format pretty... Enjoy~:) [TCP] LOCAL_IP = 10.212.29.75; #You can comment a row like this. LOCAL_PORT = 1233; SERVER_IP = 10.212.21.125; #SERVER_IP = 127.0.0.1; SERVER_PORT = 9999; [TCP] #If you have two same section name like this, error will occur. A1 = 5102; A2 = 01654;