C语言读取配置文件

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配置文件的格式如下：

key1 = value1

key2 = value2

名值对以一个=链接，一条记录以换行符分割

头文件：

#include<stdio.h>#include<stdlib.h>#include <string.h>

函数原型：

void trim(char *strIn, char *strOut);//去除字符串首位空格void getValue(char * keyAndValue, char * key, char * value);//根据key得到valueint writeCFG(const char *filename/*in*/, const char *key/*in*/, const char *value/*in*/);//写入配置文件void readCFG(const char *filename/*in*/, const char *key/*in*/, const char **value/*out*/);//读取配置文件

函数实现：

  1 void trim(char *strIn, char *strOut){  2   3     char *start, *end, *temp;//定义去除空格后字符串的头尾指针和遍历指针  4   5     temp = strIn;  6   7     while (*temp == ' '){  8         ++temp;  9     } 10  11     start = temp; //求得头指针 12  13     temp = strIn + strlen(strIn) - 1; //得到原字符串最后一个字符的指针(不是'\0') 14  15     while (*temp == ' '){ 16         --temp; 17     } 18  19     end = temp; //求得尾指针 20  21  22     for(strIn = start; strIn <= end; ){ 23         *strOut++ = *strIn++; 24     } 25  26     *strOut = '\0'; 27 } 28  29 void getValue(char * keyAndValue, char * key, char * value){ 30  31     char *p = keyAndValue; 32  33     p = strstr(keyAndValue, key); 34     if(p == NULL){ 35         //printf("没有key\n"); 36         return ; 37     } 38  39     p += strlen(key); 40     trim(p, value); 41  42     p = strstr(value, "="); 43     if(p == NULL){ 44         printf("没有=\n"); 45         return; 46     } 47     p+= strlen("="); 48     trim(p, value); 49  50     p = strstr(value, "="); 51     if(p != NULL){ 52         printf("多余的=\n"); 53         return; 54     } 55     p = value; 56     trim(p, value); 57  58 } 59 int writeCFG(const char *filename/*in*/, const char *key/*in*/, const char *value/*in*/){ 60  61     FILE *pf = NULL; 62     char ftemp[flen] = {0}, fline[1024] = {0}, *fp;    //文件缓存数组 63     long fsize = 0; 64     int reg = 0; 65     int exit = 0; 66     int i = 0; 67  68     pf = fopen(filename, "r+"); 69     if(pf == NULL){ 70         pf = fopen(filename, "w+"); 71     } 72     //获得文件大小 73     fseek(pf, 0, SEEK_END); // 将文件指针指向末尾 74     fsize = ftell(pf); 75     if(fsize > flen){ 76         printf("文件不能超过8k\n"); 77         reg = -1; 78         goto end; 79     } 80     fseek(pf, 0, SEEK_SET); //将文件指针指向开头 81  82     //一行一行的读，如果存在key则修改value存到缓存数组中 83     while(!feof(pf)){ 84         fgets(fline, 1024, pf); 85         if(strstr(fline, key) != NULL && exit == 1) 86             strcpy(fline, ""); 87         if(strstr(fline, key) != NULL && exit == 0){ //判断key是否存在 88             exit = 1; 89             sprintf(fline,"%s = %s\n", key, value); 90         } 91          92         printf("fline = %s\n", fline); 93         strcat(ftemp, fline); 94          95     } 96     if(exit != 1){//如果不存在则把key value写入到最后一行 97         sprintf(fline,"%s = %s\n", key, value); 98         strcat(ftemp, fline); 99     }100     if(pf != NULL){101         fclose(pf);102         pf = fopen(filename, "w+");103         fp = (char *)malloc(sizeof(char) * strlen(ftemp) + 1);104         strcpy(fp, ftemp);105         fp[strlen(fp) - 1] = EOF;106         fputs(fp, pf);107         if(fp != NULL){108             free(fp);109             fp = NULL;110         }111         fclose(pf);112     }113     end :114         if(pf != NULL)115             fclose(pf);116     //重新创建一个以filename命名的文件117     return reg;118 }119 120 void readCFG(const char *filename/*in*/, const char *key/*in*/, const char **value/*out*/){121 122     FILE *pf = NULL;123     char line[1024] = {0}, vtemp[1024] = {0};124 125     pf = fopen(filename, "r"); //以只读方式打开126     127     while(!feof(pf)){128         fgets(line, 1024, pf);129         getValue(line, key, vtemp);130         if(strlen(vtemp) != 0)131             break;132     }133     if(strlen(vtemp) != 0){134         *value = (char *)malloc(sizeof(char) * strlen(vtemp) + 1);135         strcpy(*value, vtemp);136     }    137     else138         *value = NULL;139     if(pf != NULL)140         fclose(pf);141 }

测试：

 1 #define filename "c:/cfg.ini" 2 void menu(){ 3     printf("===========================\n"); 4     printf("1 写入配置文件\n"); 5     printf("2 读取配置文件\n"); 6     printf("0 退出程序"); 7     printf("===========================\n"); 8 } 9 10 int tWrite(){11     12     char key[1024] = {0}, value[1024] = {0};13 14     printf("请输入key:");15     scanf("%s", key);16     printf("请输入value:");17     scanf("%s", value);18     printf("\n您输入的是：%s = %s\n", key, value);19 20     return writeCFG(filename/*in*/,key/*in*/,value/*in*/);21 }22 23 void tRead(){24     char key[1024] = {0}, *value;25 26     printf("请输入key:");27     scanf("%s", key);28 29     readCFG(filename/*in*/,key/*in*/, &value/*out*/);30     if(value == NULL){31         printf("没有key\n");32         return ;33     }34     printf("\nvalue = %s\n", value);35 36     if(value != NULL){37         free(value);38         value = NULL;39     }40 41 }42 int main(){43     44     int choose;45     46     while(1){47         choose = 0;48         menu();49         printf("请输入选择:");50         scanf("%d", &choose);51         switch(choose){52             case 1:53                 if(tWrite() == -1)54                     return -1;55                 break;56             case 2:57                 tRead();58                 break;59             case 0:60                 return 0;61             default: 62                 return 0;63         }64     }65     system("pause");66     return 0;67 }

运行结果：

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