json串：

{

• "list":[
  1. "hello",
  2. "world"
  ]

}

代码 ：

int func(char *sn)
{
    int ret = 0;
    cJSON *root, *list;

    FILE *fp = fopen("a.txt", "r");
    if(!fp) {
        printf("open sn file failed!\n");
        return -1;
    }
    struct stat st;  
    if (fstat("a.txt", &st) == -1) { 
        fclose(fp);
        return -1;
    }
    char *buffer = (char*)malloc(st.st_size);
    if(buffer == NULL) {
        fclose(fp);
        return -1;
    }
    ret = fread(buffer, 1, st.st_size, fp);
    if(ret != st.st_size) {
        printf("fread sn file failed!\n");
        goto err1;
    }
    if ((root = cJSON_Par