Linux JSON解析对象实例

Myth丶恋晨 2022-02-20 13:26 254阅读 0赞

json解析对象：a.json
    {
     "name": "中国",
     "cities": [{
       "省份": "江苏",
       "城市": ["南京", "苏州"],
       "邮编": 123
      }, {
       "省份": "广东",
       "城市": ["深圳", "广州"],
       "邮编": 123
      }, {
       "省份": "湖北",
       "城市": ["武汉", "宜昌"],
       "邮编": 123
      }]
    }
    ```

#include <stdio.h>
    #include "cJSON.h"
    #include <string.h>
    
    void cJSON_();
     
    int main()
    {
    	cJSON* obj=cJSON_CreateObject();
    	cJSON_AddStringToObject(obj,"name","中国");
            
    	cJSON* arr=cJSON_CreateArray();	
    		
    	cJSON* obj1=cJSON_CreateObject();    //江苏的
    	cJSON_AddStringToObject(obj1,"省份","江苏");
    	cJSON* arr1=cJSON_CreateArray();
    	cJSON* item=cJSON_CreateString("南京");
    	cJSON* item1=cJSON_CreateString("苏州");
    	cJSON_AddItemToArray(arr1,item);
            cJSON_AddItemToArray(arr1,item1);
            cJSON_AddItemToObject(obj1,"城市",arr1);
    	cJSON_AddNumberToObject(obj1,"邮编",123);
    
    	cJSON* obj2=cJSON_CreateObject();    //广东的
    	cJSON_AddStringToObject(obj2,"省份","广东");
    	cJSON* arr2=cJSON_CreateArray();
    	cJSON* item2=cJSON_CreateString("深圳");
    	cJSON* item3=cJSON_CreateString("广州");
    	cJSON_AddItemToArray(arr2,item2);
            cJSON_AddItemToArray(arr2,item3);
            cJSON_AddItemToObject(obj2,"城市",arr2);
    	cJSON_AddNumberToObject(obj2,"邮编",123); 
    
    	cJSON* obj3=cJSON_CreateObject();    //湖北的
    	cJSON_AddStringToObject(obj3,"省份","湖北");
    	cJSON* arr3=cJSON_CreateArray();
    	cJSON* item4=cJSON_CreateString("武汉");
    	cJSON* item5=cJSON_CreateString("宜昌");
    	cJSON_AddItemToArray(arr3,item4);
            cJSON_AddItemToArray(arr3,item5);
            cJSON_AddItemToObject(obj3,"城市",arr3);
    	cJSON_AddNumberToObject(obj3,"邮编",123);
    
            cJSON_AddItemToArray(arr,obj1);
            cJSON_AddItemToArray(arr,obj2);
            cJSON_AddItemToArray(arr,obj3);
            
            cJSON_AddItemToObject(obj,"cities",arr);
    
    	char* p=cJSON_Print(obj);
    	FILE* fp=fopen("a.json","w");
    	fwrite(p,strlen(p),1,fp);
    	fclose(fp);
    		 
    	//-------------------------------------------
     
    	fp=fopen("a.json","rb");
    	fseek(fp,0,SEEK_END);
    	int len=ftell(fp);
    	rewind(fp);
    	char a[len+1];
    	fread(a,len,1,fp);
    	a[len]='\0';
    	const char* j=a;
    	cJSON* json=cJSON_Parse(j);
    	cJSON_(json);
    
    	return 0;
    
    }
    
    void cJSON_(cJSON* json)
    {
    	int i;
    	int size=0;
            int type;
    	while(json)
    	{
    	     type=json->type;			
                 switch(type)
    	     {
    		case 0:{
    			  printf ("false");
    			  break;
    			}
    		case 1:{
    			   printf ("true");
    			   break;
    			}
    		case 2:{
    			    printf ("null");
    			    break;
                            }
    		case 3:{
    			     printf ("%d",json->valueint);
    			     break;
    			}
    		case 4:{
    			     printf ("\"%s\"",json->valuestring);
    			     break;
    			}
    		case 5:{   
                                printf  ("[");
    			    cJSON* item=json->child;						   
                                if (item !=NULL)
    				   cJSON_(item);
    			    if(json->next)
    				    printf (",");
    			    printf("]\n");
    			    break;
    			}
    		case 6:{
    			     printf ("{");
    			     cJSON* obj=json->child;
    			     while(obj)
    			     {
    				  printf ("\"%s\":",obj->string);
    				  cJSON_(obj);
    				  if(obj->next)
    				        printf (",");
    				   obj=obj->next;
    			      }
    			      printf ("}\n");
    			       break;
    			  }
    		}
    		json=json->next;
    		if(json)
    		    printf (",");
    	}
    
    }