CJSON数据解析

JSON数据解析（遗忘备份）

代码主要是给自己看的，程序中有些特定的函数，均可以用C库中的函数替代。

参考链接
https://blog.csdn.net/pl0020/article/details/120277294

#include "iot_os.h"
#include "user_code.h"
#include "cjson.h"

/*
    功能简介：解析DATA2 数据 
    2022-07-10
*/


char DATA2[]="{"EntityNo":"140106000001","DeviceNo":"00001","Idx":"576934","Func":"6","Body":[{
            "Module":"ID1","Status":1,"Reg_Val":{"Temp1":8,"Temp2":7,"Temp3":9}}]}";

char buff[] = "JSON format ok, start parse!";
char buff1[] = "parse complete";
char buff2[] = "JSON format error";
char buff3[1024];

struct data_info{
	unsigned char EntityNo[64];       //数据类型待考虑
	unsigned char DeviceNo[64];
	unsigned char Idx[64];
	unsigned int Func;
	unsigned char Module[100];
	unsigned int Status;
	unsigned int Reg_Val[4];
	
};

struct data_info data_info;

//解析数组
int parseData(uint8_t *str)
{
    int ret = 0;
    cJSON *root, *B_array;   //创建根 （主根，数组根）
    cJSON *Body, *Reg_Val;    //数组名，数组中包含属性的对象名
    root = cJSON_Parse((const char *)str);   //创建JSON解析对象，返回JSON格式是否正确
    if (root != 0)
    {
        zq_uart_write(buff,strlen(buff));
            
            memset(data_info.DeviceNo,0x00,sizeof(data_info.DeviceNo)); //该赋值方式可以实现字符串解析读取
            sprintf(data_info.DeviceNo,"%s",cJSON_GetObjectItem(root, "DeviceNo")->valuestring);
            memset(data_info.EntityNo,0x00,sizeof(data_info.EntityNo)); //该赋值方式可以实现字符串解析读取
            sprintf(data_info.EntityNo,"%s",cJSON_GetObjectItem(root, "EntityNo")->valuestring);
            memset(data_info.Idx,0x00,sizeof(data_info.Idx)); //该赋值方式可以实现字符串解析读取
            sprintf(data_info.Idx,"%s",cJSON_GetObjectItem(root, "Idx")->valuestring);

                //通过调用cJSON_GetObjectItem，获取到数组results！！！！
                B_array = cJSON_GetObjectItem(root, "Body");  //Body是服务器下发JSON数据的数组名
        		if(B_array->type == cJSON_Array)
                {
                    //由于提前知道数组只包含1个元素，因此不用再调用cJSON_GetArraySize来获取元素个数，而是直接读第0个元素的值
                    Body = cJSON_GetArrayItem(B_array, 0);//在数组中检索第0个元素
                    
                    if(Body->type == cJSON_Object)//如果第0个元素的类型是“对象”
                    {
         
                        /* Body data parse */  //将数组中的单属性对象的数据提取出来赋值给结构体变量
                        memset(data_info.Module,0x00,sizeof(data_info.Module)); //该赋值方式可以实现字符串解析读取
                        sprintf(data_info.Module,"%s",cJSON_GetObjectItem(Body, "Module")->valuestring);
                        data_info.Status = cJSON_GetObjectItem(Body, "Status")->valueint;
                        // /* Reg_Val data parse */
                        Reg_Val = cJSON_GetObjectItem(Body, "Reg_Val");  //获取数组中带多属性的对象
                        if(Reg_Val->type == cJSON_Object)
                        {
                            data_info.Reg_Val[0] = cJSON_GetObjectItem(Reg_Val, "Temp1")->valueint;
                            data_info.Reg_Val[1] = cJSON_GetObjectItem(Reg_Val, "Temp2")->valueint;
                            data_info.Reg_Val[2] = cJSON_GetObjectItem(Reg_Val, "Temp3")->valueint;
                        } 
                        else return 1;
                    } 
                    else return 1;

                } 
                else return 1;
    }
    else return 1;
        
         zq_uart_write(buff1,strlen(buff1));
    cJSON_Delete(root);
    return ret;
}

display()
{
        unsigned char buff3[1024];
        memset(buff3,0x00,sizeof(buff3));
        sprintf(buff3,"EntityNo is %s, DeviceNo is %s, Idx is %s, Func is %d, Module is %s, Status is %d, Temp1 is %d, Temp2 is %d Temp3 is %d",
        data_info.EntityNo,data_info.DeviceNo,data_info.Idx,data_info.Func,data_info.Module,
          data_info.Status,data_info.Reg_Val[0],data_info.Reg_Val[1],data_info.Reg_Val[2]);
        zq_uart_write(buff3,strlen(buff3));
}

void app_init(void)
{
//注册 服务器A 接收事件
//注册 串口 接收事件
    struct zq_recv_cb cb;
    memset(&cb,0x00,sizeof(cb));
    zq_set_recv_cb(cb);
}

void app_main(PVOID pParameter)
{
    app_init();

    for(;;)
	{	
        parseData(DATA2);
        display();
        zq_sleep(5000);
	}	
}
PTASK_MAIN user_task = app_main; 

运行结果
EntityNo is 140106000001,
 DeviceNo is 00001, 
 Idx is 576934, 
 Func is 6,
  Module is ID1, 
  Status is 1, 
  Temp1 is 8, 
  Temp2 is 7 
  Temp3 is 9`

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