C语言【微项目16】—JSON值提取器V1版[纯字符串处理]【2022-03-17】

• 1. tdtxjson.c
• 2. 运行效果截图（长图）

【TDTX】
【C99】
【编译与运行环境】64位Windows操作系统，TDM-gcc 4.9.2 64bit（-std=c99）编译。

【问题描述】提取出JSON格式文件中的所有值。
【功能】：支持{ }、[ ] (有限支持)。其中[ ]只支持其中是键值对的数组！
【特注】 实现了一个JSON值的提取器，而不是实现了一个JSON转对象或者结构体！

【版本】version 1.0
【将json文件与该代码的exe放在同一个目录文件夹下】

1. tdtxjson.c

#include #include #include void prase(const char* p,int n){char key[n];char value[n];char t[n];int count_left = 0;int count_right = 0;int ismatch = 0;int start = -1;int end = -1;int k = 0;int isvalue = 0;for(int i = 0;i < strlen(p);i++){if(isvalue == 0 && p[i] == ':'){isvalue = 1;continue;}if(isvalue == 1){if((p[i] == ',' || p[i] == '}') && (count_left==count_right && count_left == 0)){t[k] = '\0';printf("---->value is:%s\n",t);k = 0;t[k] = '\0';isvalue = 0;continue;}if(p[i] == '{'){if(ismatch == 0){ismatch = 1;}if(ismatch == 1){count_left++;}}if(p[i] == '['){if(ismatch == 0){ismatch = 2;}if(ismatch == 2){count_left++;}}if(p[i] == '}' || p[i] == ']'){if(ismatch == 2 && p[i] == ']'){count_right++;}if(ismatch == 1 && p[i] == '}'){count_right++;}}t[k++] = p[i];//printf("count_left=%d,count_right=%d,ismatch=%d,i=%d\n",count_left,count_right,ismatch,i);if(count_left == count_right && count_left != 0){t[k] = '\0';printf("----》》》value is:%s\n",t);prase(t,n);puts("-----------------------------------------------------------------------------------");k = 0;t[k] = '\0';ismatch = 0;count_left = 0;count_right = 0;isvalue = 0;}}}}int main() {char filename[100];puts("输入要解析的文件名：");gets(filename); int len = strlen(filename);filename[len] = '.';filename[len+1] = 'j';filename[len+1+1] = 's';filename[len+1+1+1] = 'o';filename[len+1+1+1+1] = 'n';puts("\n被解析字符串：");FILE* file = fopen(filename,"r");char ch;char* p = (char*) malloc(sizeof(char)*0);int j = 0;while((ch=fgetc(file)) != EOF){p[j++] = ch;p = (char*)realloc(p,sizeof(char)*j);p[j-1] = ch;}p[j] = '\0';puts(p);prase(p,j);free(p);printf("\n\nok");system("pause");return 0;}

2. 运行效果截图（长图）