cJson实战用途

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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;  
    }  

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