linux c 讀寫 ini 配置文件

.ini 文件格式以下：

[section1]

key1=value

...

keyn=value

[section2]

key1=value

...

keyn=value

代碼以下：

#define _PARAM_GLOBALS_ #include <stdio.h> #include <stdlib.h> #include <string.h> #include "userlib.h" #include "paramConfig.h"
 
#define SECTION_MAX_LEN 256
#define STRVALUE_MAX_LEN 256
#define LINE_CONTENT_MAX_LEN 256
//read value from .ini
void IniReadValue(char* section, char* key, char* val, const char* file) { FILE* fp; int i = 0; int lineContentLen = 0; int position = 0; char lineContent[LINE_CONTENT_MAX_LEN]; bool bFoundSection = false; bool bFoundKey = false; fp = fopen(file, "r"); if(fp == NULL) { printf("%s: Opent file %s failed.\n", __FILE__, file); return; } while(feof(fp) == 0) { memset(lineContent, 0, LINE_CONTENT_MAX_LEN); fgets(lineContent, LINE_CONTENT_MAX_LEN, fp); if((lineContent[0] == ';') || (lineContent[0] == '\0') || (lineContent[0] == '\r') || (lineContent[0] == '\n')) { continue; } //check section
        if(strncmp(lineContent, section, strlen(section)) == 0) { bFoundSection = true; //printf("Found section = %s\n", lineContent);
            while(feof(fp) == 0) { memset(lineContent, 0, LINE_CONTENT_MAX_LEN); fgets(lineContent, LINE_CONTENT_MAX_LEN, fp); //check key
                if(strncmp(lineContent, key, strlen(key)) == 0) { bFoundKey = true; lineContentLen = strlen(lineContent); //find value
                    for(i = strlen(key); i < lineContentLen; i++) { if(lineContent[i] == '=') { position = i + 1; break; } } if(i >= lineContentLen) break; strncpy(val, lineContent + position, strlen(lineContent + position)); lineContentLen = strlen(val); for(i = 0; i < lineContentLen; i++) { if((lineContent[i] == '\0') || (lineContent[i] == '\r') || (lineContent[i] == '\n')) { val[i] = '\0'; break; } } } else if(lineContent[0] == '[') { break; } } break; } } if(!bFoundSection){printf("No section = %s\n", section);} else if(!bFoundKey){printf("No key = %s\n", key);} fclose(fp); } int readStringValue(const char* section, char* key, char* val, const char* file) { char sect[SECTION_MAX_LEN]; //printf("section = %s, key = %s, file = %s\n", section, key, file);
    if (section == NULL || key == NULL || val == NULL || file == NULL) { printf("%s: input parameter(s) is NULL!\n", __func__); return READ_STR_ERR; } memset(sect, 0, SECTION_MAX_LEN); sprintf(sect, "[%s]", section); //printf("reading value...\n");
 IniReadValue(sect, key, val, file); return READ_STR_OK; } int readIntValue(const char* section, char* key, const char* file) { char strValue[STRVALUE_MAX_LEN]; memset(strValue, '\0', STRVALUE_MAX_LEN); if(readStringValue(section, key, strValue, file) != READ_STR_OK) { printf("%s: error", __func__); return 0; } return(atoi(strValue)); } void IniWriteValue(const char* section, char* key, char* val, const char* file) { FILE* fp; int i = 0, n = 0, err = 0; int lineContentLen = 0; int position = 0; char lineContent[LINE_CONTENT_MAX_LEN]; char strWrite[LINE_CONTENT_MAX_LEN]; bool bFoundSection = false; bool bFoundKey = false; memset(lineContent, '\0', LINE_CONTENT_MAX_LEN); memset(strWrite, '\0', LINE_CONTENT_MAX_LEN); n = sprintf(strWrite, "%s=%s\n", key, val); fp = fopen(file, "r+"); if(fp == NULL) { printf("%s: Opent file %s failed.\n", __FILE__, file); return; } while(feof(fp) == 0) { memset(lineContent, 0, LINE_CONTENT_MAX_LEN); fgets(lineContent, LINE_CONTENT_MAX_LEN, fp); if((lineContent[0] == ';') || (lineContent[0] == '\0') || (lineContent[0] == '\r') || (lineContent[0] == '\n')) { continue; } //check section
        if(strncmp(lineContent, section, strlen(section)) == 0) { bFoundSection = true; while(feof(fp) == 0) { memset(lineContent, 0, LINE_CONTENT_MAX_LEN); fgets(lineContent, LINE_CONTENT_MAX_LEN, fp); //check key
                if(strncmp(lineContent, key, strlen(key)) == 0) { bFoundKey = true; printf("%s: %s=%s\n", __func__, key, val); fseek(fp, (0-strlen(lineContent)),SEEK_CUR); err = fputs(strWrite, fp); if(err < 0){printf("%s err.\n", __func__);} break; } else if(lineContent[0] == '[') { break; } } break; } } if(!bFoundSection){printf("No section = %s\n", section);} else if(!bFoundKey){printf("No key = %s\n", key);} fclose(fp); } int writeStringVlaue(const char* section, char* key, char* val, const char* file) { char sect[SECTION_MAX_LEN]; //printf("section = %s, key = %s, file = %s\n", section, key, file);
    if (section == NULL || key == NULL || val == NULL || file == NULL) { printf("%s: input parameter(s) is NULL!\n", __func__); return READ_STR_ERR; } memset(sect, '\0', SECTION_MAX_LEN); sprintf(sect, "[%s]", section); IniWriteValue(sect, key, val, file); } int writeIntValue(const char* section, char* key, int val, const char* file) { char strValue[STRVALUE_MAX_LEN]; memset(strValue, '\0', STRVALUE_MAX_LEN); sprintf(strValue, "%-4d", val); writeStringVlaue(section, key, strValue, file);
}

在 writeIntValue() 函數中 sprintf(strValue, "%-4d", val); 作了對齊及位寬處理，主要是由於避免不一樣的位數數據寫入出現錯誤。目前還沒想到比較好的解決方案，暫時就這樣處理了。