cJSON实例

/* 本实例转自博客：http://blog.csdn.net/linrs0/article/details/45368659 */

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* example json file * name file * { * "firstname":"lin",* "lastname":"spock",* "age":"25",* "address":{ * "city": "New York",* "country":"USA",* "street":["11","22","33"] * },* "hobbies":["basketball","football"],* "new":["new"] * } *************************************************/ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdint.h> #include "cJSON.h" void Set(cJSON *root,char *str3,char *str4,char *str5,char *str6) { /*json filename set fathercjson childcjson newvalue*/ if (strcmp(str3,"root") == 0) { /*jsona file set root firstname chen*/ cJSON *tmp_json = cJSON_GetobjectItem(root,str4); if (tmp_json != NULL) { cJSON_ReplaceItemInObject(root,str4,cJSON_CreateString(str5)); } else { fprintf(stderr,"%s元素不存在，請先添加\n",str4); fprintf(stdout,"新增元素命令格式：程序 json文件名 add object|array 父元素 子元素 新值\n"); exit(0); } } else { cJSON *tmp_json = cJSON_GetobjectItem(root,str3); if (tmp_json != NULL) { if (tmp_json->type == cJSON_Object) { /*json file set address city Beijing*/ cJSON *obj_json = cJSON_GetobjectItem(tmp_json,str4); if (obj_json != NULL) { cJSON_ReplaceItemInObject(tmp_json,cJSON_CreateString(str5)); } else { fprintf(stderr,"%s元素不存在，请先创建\n",str4); exit(0); } } else if (tmp_json->type == cJSON_Array) { /*json file set hobbies 1 readbook*/ int count = cJSON_GetArraySize(tmp_json); if (atoi(str4) < (count + 1) && atoi(str4) > 0) { cJSON_ReplaceItemInArray(tmp_json,atoi(str4) - 1,"该数组不存在第%s个元素，请重新输入\n",str4); exit(0); } } } else { fprintf(stderr,str3); fprintf(stdout,"新增元素命令格式：程序 json文件名 add object|array 父元素 子元素 新值\n"); exit(0); } } } void Add(cJSON *root,char *str6) { /*json filename add object fathercjson childcjson addvlaue*/ if (strcmp(str3,"object") == 0) { if (strcmp(str4,"root") == 0) { /*jsona file add object root test test*/ cJSON *tmp_json = cJSON_GetobjectItem(root,str5); if (tmp_json != NULL) { fprintf(stderr,"%s元素已存在，請先删除\n",str5); fprintf(stdout,"删除命令：程序 json文件名 delete 父元素 子元素\n"); exit(0); } else { cJSON_AddItemToObject(root,str5,cJSON_CreateString(str6)); } } else { /*json file add object address planet eirth*/ cJSON *tmp_json = cJSON_GetobjectItem(root,str4); if (tmp_json != NULL) { if (tmp_json->type == cJSON_Object) { cJSON *obj_json = cJSON_GetobjectItem(tmp_json,str5); if (obj_json != NULL) { fprintf(stderr,str5); fprintf(stdout,"删除命令：程序 json文件名 delete 父元素 子元素\n"); exit(0); } else { cJSON_AddItemToObject(tmp_json,cJSON_CreateString(str6)); } } else if (tmp_json->type == cJSON_Array) { cJSON *obj_json = cJSON_CreateObject(); cJSON_AddItemToArray(tmp_json,obj_json); cJSON_AddStringToObject(obj_json,str6); } } else { fprintf(stderr,"%s元素不存在，请在上一级先添加%s\n",str4); exit(0); } } } else if (strcmp(str3,"array") == 0) { /*json filename add array fathercjson childcjson addvalue*/ if (strcmp(str4,"root") == 0) { /*jsona file add array root hobbies vallyball*/ cJSON *tmp_json = cJSON_GetobjectItem(root,str5); if (tmp_json != NULL) { cJSON_AddItemToArray(tmp_json,cJSON_CreateString(str6)); } else { cJSON *tmp_json = cJSON_CreateArray(); cJSON_AddItemToObject(root,tmp_json); cJSON_AddItemToArray(tmp_json,cJSON_CreateString(str6)); } } else { fprintf(stderr,"%s数组下尚不能添加二级数组或对象\n",str4); exit(0); /* cJSON *tmp_json = cJSON_GetobjectItem(root,str4); cJSON *arr_json = cJSON_GetobjectItem(tmp_json,str5); if (arr_json != NULL) { cJSON_AddItemToArray(arr_json,cJSON_CreateString(str6)); } else { cJSON *arr_json = cJSON_CreateArray(); cJSON_AddItemToObject(tmp_json,arr_json); cJSON_AddItemToArray(arr_json,cJSON_CreateString(str6)); } */ } } else { fprintf(stderr,"第三个参数可选值为： object|array，请重新输入\n"); exit(0); } } void Delete(cJSON *root,char *str4) { /*json filename delete fathercjson childcjson*/ if (strcmp(str3,"root") == 0) { /*/json file delete root firstname*/ cJSON *tmp_json = cJSON_GetobjectItem(root,str4); if (tmp_json != NULL) { cJSON_DeleteItemFromObject(root,str4); } else { fprintf(stderr,"%s元素不存在，请重新输入\n",str4); exit(0); } } else { cJSON *tmp_json = cJSON_GetobjectItem(root,str3); if (tmp_json != NULL) { /*json file delete address city*/ if (tmp_json->type == cJSON_Object) { cJSON *obj_json = cJSON_GetobjectItem(tmp_json,str4); if (obj_json != NULL) { cJSON_DeleteItemFromObject(tmp_json,str4); } else { fprintf(stderr,str4); exit(0); } } else if (tmp_json->type == cJSON_Array) { /*json file delete hobbies 2*/ int count = cJSON_GetArraySize(tmp_json); if (atoi(str4) < (count + 1) && atoi(str4) > 0) { cJSON_DeleteItemFromArray(tmp_json,atoi(str4) - 1); } else { fprintf(stderr,str4); (0); } } } else { fprintf(stderr,str3); exit(0); } } } int main(int argc,char *argv[]) { FILE *fp = fopen(argv[1],"r"); /*从文件中读取要解析的JSON数据*/ if (fp == NULL) { fprintf(stderr,"第二个参数为文件名，%s文件打开失败\n"); exit(0); } fseek(fp,SEEK_END); /*将指针指向文件末尾*/ long len = ftell(fp); /*ftell获得当前指针位置相对于文件首的偏移字节数*/ fseek(fp,SEEK_SET); /*再将指针指回开头*/ char *data = (char*) malloc(len + 1); /*分配内存*/ fread(data,1,len,fp); /*printf("%s\n",data)*/ fclose(fp); cJSON *root = cJSON_Parse(data); /*将字符串解析成json结构体*/ char *ro = cJSON_Print(root); /*可通过这个指针输出内容测试*/ if (NULL == root) { fprintf(stderr,"error:%s\n",cJSON_GetErrorPtr()); cJSON_Delete(root); } if (strcmp(argv[2],"set") == 0) { /*改*/ if (argc != 6) { fprintf(stderr,"参数过少或过多\n"); fprintf(stdout,"set命令参数有6个\n命令格式：程序 json文件名 set 父元素 子元素 新值\n"); exit(0); } Set(root,argv[3],argv[4],argv[5],argv[6]); } else if (strcmp(argv[2],"add") == 0) { /*增*/ if (argc != 7) { fprintf(stderr,"add命令参数有7个\n命令格式：程序 json文件名 add object|array 父元素 子元素 新值\n"); exit(0); } Add(root,"delete") == 0) { /*删*/ if (argc != 5) { fprintf(stderr,"delete命令参数有五个\n命令格式：程序 json文件名 delete 父元素 子元素\n"); exit(0); } Delete(root,argv[4]); } else { fprintf(stderr,"第三个参数错误\n" "第三个参数为:set | add | delete\n"); fprintf(stdout,"具体命令格式为：\n" "修改：程序 json文件名 set 父元素 子元素 新值\n" "添加：程序 json文件名 add object|array 父元素 子元素 新值\n" "删除：程序 json文件名 delete 父元素 子元素\n" "當所要操作元素在最外層時父元素為\"root\"\n"); exit(0); } FILE *file; file = fopen("file3","wb"); /*将cjson写入文件*/ char *out = cJSON_Print(root); fprintf(file,"%s",out); fclose(file); free(out); return 1; }