????????編寫方向：本人就不泛泛的編寫一篇什么一文學(xué)會(huì)cJSON了，沒什么突出點(diǎn)，也就我水水字?jǐn)?shù)，你們看來看去也不懂，本人是從上阿里云傳信息接觸的cJSON的，我就此寫一篇針對(duì)性的文章，希望對(duì)大家有用，后期我在其他方面用到還會(huì)繼續(xù)更新。

一、簡(jiǎn)介

????????cJSON是一個(gè)用C語言編寫的輕量級(jí)JSON解析器和生成器庫。它由Derek M. Jones創(chuàng)建，旨在為C程序員提供一種簡(jiǎn)單的方法來處理JSON數(shù)據(jù)。cJSON的主要特點(diǎn)包括：

• 易用性：cJSON設(shè)計(jì)得非常直觀，使得JSON對(duì)象的創(chuàng)建和處理變得簡(jiǎn)單直接。
• 動(dòng)態(tài)內(nèi)存管理：cJSON內(nèi)部會(huì)自動(dòng)管理內(nèi)存分配與釋放，簡(jiǎn)化了用戶代碼。
• 錯(cuò)誤處理：能夠報(bào)告解析錯(cuò)誤的位置和其他相關(guān)信息。
• 支持完整的JSON數(shù)據(jù)類型：包括數(shù)字、字符串、布爾值、數(shù)組、對(duì)象等。

????????使用cJSON，你可以輕松地創(chuàng)建JSON對(duì)象，添加鍵值對(duì)，然后將其轉(zhuǎn)換為字符串。相反，你也可以解析JSON字符串，提取其中的值，并根據(jù)需要操作它們。

二、解決的問題

????????1、問題闡述

? ? ? ? 首先我先闡述一下我遇到的問題：我在用以下這種格式（圖-1）上傳動(dòng)態(tài)數(shù)據(jù)到阿里云端的時(shí)候發(fā)現(xiàn)—“字符串%s“—形式的數(shù)據(jù)上傳的時(shí)候不被識(shí)別，如（圖-2）所示

圖-1?

圖-2

? ? ? ? ?sprintf基本用法及示例：

????????是 C 語言中的一個(gè)標(biāo)準(zhǔn)庫函數(shù)，用于格式化輸出到一個(gè)字符串中。它的工作方式類似于 printf 函數(shù)，但是輸出不是發(fā)送到標(biāo)準(zhǔn)輸出設(shè)備（通常是屏幕），而是寫入到一個(gè)字符數(shù)組中。

????????示例：

#include <stdio.h>
#include <string.h>int main() {int num = 42;char str[20];sprintf(str, "The answer is %d", num);printf("%s\n", str);  // 輸出: The answer is 42return 0;
}

三、cJSON構(gòu)建傳輸字符串?

? ? ? ? 1、完整的構(gòu)建代碼：希望大家閱讀代碼的時(shí)候，可以把代碼復(fù)制出去，然后對(duì)照著我下面的講解看

void set_temp_humid(void)
{/*定義變量，定義需要上傳的各類信息，我這里就先以固定數(shù)實(shí)現(xiàn)數(shù)據(jù)上傳*/int humid = 1;int temperature = 1;char ID[10];IC_IDGet(ID);u1_printf ("%s",ID);/*定義用來存放構(gòu)建的JSON轉(zhuǎn)化的字符串*/char *str = NULL; // 指向JSON字符串的指針/*此處用cJSON結(jié)構(gòu)體定義一個(gè)對(duì)象，用來存放需要構(gòu)建的信息*/cJSON *json = cJSON_CreateObject(); // 創(chuàng)建一個(gè)空的JSON對(duì)象cJSON *params_cjson = cJSON_CreateObject(); // 創(chuàng)建一個(gè)空的子JSON對(duì)象// 向子JSON對(duì)象添加數(shù)據(jù)cJSON_AddNumberToObject(params_cjson, "humid", humid);cJSON_AddNumberToObject(params_cjson, "temp", temperature);cJSON_AddStringToObject(params_cjson, "ID", ID);// 向主JSON對(duì)象添加數(shù)據(jù)cJSON_AddItemToObject(json, "method", cJSON_CreateString("thing.service.property.post"));cJSON_AddItemToObject(json, "id", cJSON_CreateString("99119635"));cJSON_AddItemToObject(json, "params", params_cjson);cJSON_AddItemToObject(json, "version", cJSON_CreateString("1.0.0"));// 將JSON對(duì)象轉(zhuǎn)換為無格式的字符串str = cJSON_PrintUnformatted(json);// 打印JSON格式的字符串u1_printf("json格式 = %s\r\n", str);MQTT_PublishQs0(P_TOPIC_NAME,str,strlen(str));    //添加數(shù)據(jù)，發(fā)布給服務(wù)器	// 清理JSON對(duì)象占用的內(nèi)存cJSON_Delete(json);// 如果分配了額外的字符串空間，釋放它if(str != NULL){free(str);str = NULL;u1_printf("釋放str空間成功\r\n");}Delay_ms(1000);}

2、詳細(xì)講解

? ? ? ? 第一步：

? ? ? ? 先對(duì)需要上傳的信息變量進(jìn)行定義，用來接收各個(gè)傳感器模塊收集到的動(dòng)態(tài)數(shù)據(jù)?

? ? ? ? 第二步：

????????定義一個(gè)可以接收自己后面構(gòu)建的JSON字符串轉(zhuǎn)化成的無格式字符串

? ? ? ? 第三步：

? ? ? ? 用cJSON結(jié)構(gòu)體 定義空的主JSON對(duì)象和子JSON對(duì)象

? ? ? ? ?第四步：

? ? ? ? 分別向子JSON對(duì)象和主JSON對(duì)象添加要構(gòu)建的數(shù)據(jù)? ? ? ??

? ? ? ? 第五步：

? ? ? ? 轉(zhuǎn)換JSON對(duì)象為無格式的字符串并存入前面定義的str指針

? ? ? ? 第六步：

? ? ? ? 一定要將“?JSON “對(duì)象和存儲(chǔ)無格式字符串用的指針 str 清空，要不然會(huì)造成占用內(nèi)存導(dǎo)致卡機(jī)

四、相關(guān)函數(shù)詳解?

①、cJSON_CreateObject()

????????是一個(gè)用于創(chuàng)建 JSON 對(duì)象的基礎(chǔ)函數(shù)? ? ? ?

????????具體用法如下：

②、向JSON對(duì)象中添加數(shù)據(jù)的幾類函數(shù)

1. cJSON_AddNullToObject(object, name)

   • 作用：向 JSON 對(duì)象中添加一個(gè)?null?值。
   • 參數(shù)：
     • object：指向 cJSON 結(jié)構(gòu)體的指針，表示要添加 null 值的目標(biāo) JSON 對(duì)象。
     • name：鍵名（字符串），表示 null 值對(duì)應(yīng)的鍵。

2. cJSON_AddTrueToObject(object, name)

   • 作用：向 JSON 對(duì)象中添加一個(gè)布爾值?true。
   • 參數(shù)：
     • object：指向 cJSON 結(jié)構(gòu)體的指針，表示要添加 true 值的目標(biāo) JSON 對(duì)象。
     • name：鍵名（字符串），表示 true 值對(duì)應(yīng)的鍵。

3. cJSON_AddFalseToObject(object, name)

   • 作用：向 JSON 對(duì)象中添加一個(gè)布爾值?false。
   • 參數(shù)：
     • object：指向 cJSON 結(jié)構(gòu)體的指針，表示要添加 false 值的目標(biāo) JSON 對(duì)象。
     • name：鍵名（字符串），表示 false 值對(duì)應(yīng)的鍵。

4. cJSON_AddBoolToObject(object, name, b)

   • 作用：向 JSON 對(duì)象中添加一個(gè)布爾值，可以是?true?或?false。
   • 參數(shù)：
     • object：指向 cJSON 結(jié)構(gòu)體的指針，表示要添加布爾值的目標(biāo) JSON 對(duì)象。
     • name：鍵名（字符串），表示布爾值對(duì)應(yīng)的鍵。
     • b：布爾值，可以是?true?或?false（通常為?1?或?0）。

5. cJSON_AddNumberToObject(object, name, n)

   • 作用：向 JSON 對(duì)象中添加一個(gè)數(shù)值。
   • 參數(shù)：
     • object：指向 cJSON 結(jié)構(gòu)體的指針，表示要添加數(shù)值的目標(biāo) JSON 對(duì)象。
     • name：鍵名（字符串），表示數(shù)值對(duì)應(yīng)的鍵。
     • n：數(shù)值（通常是?double?類型），表示要添加的數(shù)值。

6. cJSON_AddStringToObject(object, name, s)

   • 作用：向 JSON 對(duì)象中添加一個(gè)字符串值。
   • 參數(shù)：
     • object：指向 cJSON 結(jié)構(gòu)體的指針，表示要添加字符串值的目標(biāo) JSON 對(duì)象。
     • name：鍵名（字符串），表示字符串值對(duì)應(yīng)的鍵。
     • s：字符串值（通常是?char *?類型），表示要添加的字符串。

????????具體應(yīng)用：

#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "Serial.h"
#include "led.h"
#include "cJSON.h"uint8_t RxData;			//定義用于接收串口數(shù)據(jù)的變量int main(void)
{/*串口初始化*/Serial_Init();while (1){cJSON *json = cJSON_CreateObject();// 向 JSON 對(duì)象中添加不同類型的值cJSON_AddStringToObject(json, "name", "Alice");cJSON_AddNumberToObject(json, "age", 25);cJSON_AddBoolToObject(json, "is_student", 1);cJSON_AddNullToObject(json, "job");cJSON_AddTrueToObject(json, "is_active");cJSON_AddFalseToObject(json, "is_admin");// 打印 JSON 對(duì)象Serial_Printf("%s\n", cJSON_Print(json));// 清理內(nèi)存cJSON_Delete(json);Delay_ms(100);}}

????????結(jié)果顯示：?

③、cJSON_PrintUnformatted（）

????????是 cJSON 庫中的一個(gè)函數(shù)，用于將 cJSON 結(jié)構(gòu)體轉(zhuǎn)換為一個(gè)未格式化的 JSON 字符串。

????????具體用法：

④、free、cJSON_Delete（）

????????free是 C 標(biāo)準(zhǔn)庫中的一個(gè)函數(shù)，用于釋放之前通過 malloc、calloc 或 realloc 動(dòng)態(tài)分配的內(nèi)存塊。

??cJSON_Delete 是 cJSON 庫提供的一個(gè)專用函數(shù)，用于釋放 cJSON 結(jié)構(gòu)體及其關(guān)聯(lián)的所有內(nèi)存。當(dāng)你使用 cJSON 庫創(chuàng)建了 JSON 對(duì)象或數(shù)組時(shí)，應(yīng)該使用 cJSON_Delete 來釋放這些對(duì)象占用的內(nèi)存。

????????具體用法：

五、以STM32C8T6為核心的構(gòu)建過程可能會(huì)產(chǎn)生的問題?

? ? ? ?1、當(dāng)你的項(xiàng)目代碼很多時(shí)會(huì)出現(xiàn)的相關(guān)問題

????????因?yàn)榇a過多，單片機(jī)的內(nèi)存資源有限，如果之前沒有做過改變空間資源等先關(guān)操作的人第一次可能會(huì)發(fā)現(xiàn)，將代碼移植到一個(gè)簡(jiǎn)單工程中的時(shí)候，可以正常運(yùn)行，但是當(dāng)自己移植到一個(gè)相對(duì)復(fù)雜的程序中時(shí)，整個(gè)程序好像不動(dòng)了，串口打印也消失了，這個(gè)時(shí)候就是內(nèi)存分配的原因?qū)е碌??？梢詮囊韵逻@個(gè)地方改動(dòng)來匹配自己的程序。

? ? ? ? ①、找到后綴為 .s 的這個(gè)文件，這是單片機(jī)的啟動(dòng)文件

? ? ? ? ②、修改以下箭頭指的地方，正常來說這里應(yīng)該是0x00000200,我這里是根據(jù)我的工作做了修改，大家可以根據(jù)自己的工程需要分配大小

六、cJSON源碼

?????????cJSON.c

/*Copyright (c) 2009 Dave GamblePermission is hereby granted, free of charge, to any person obtaining a copyof this software and associated documentation files (the "Software"), to dealin the Software without restriction, including without limitation the rightsto use, copy, modify, merge, publish, distribute, sublicense, and/or sellcopies of the Software, and to permit persons to whom the Software isfurnished to do so, subject to the following conditions:The above copyright notice and this permission notice shall be included inall copies or substantial portions of the Software.THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS ORIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THEAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHERLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS INTHE SOFTWARE.
*//* cJSON */
/* JSON parser in C. */#include <string.h>
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <float.h>
#include <limits.h>
#include <ctype.h>
#include "cJSON.h"static const char *ep;const char *cJSON_GetErrorPtr(void) {return ep;}static int cJSON_strcasecmp(const char *s1,const char *s2)
{if (!s1) return (s1==s2)?0:1;if (!s2) return 1;for(; tolower(*s1) == tolower(*s2); ++s1, ++s2)	if(*s1 == 0)	return 0;return tolower(*(const unsigned char *)s1) - tolower(*(const unsigned char *)s2);
}static void *(*cJSON_malloc)(size_t sz) = malloc;
static void (*cJSON_free)(void *ptr) = free;static char* cJSON_strdup(const char* str)
{size_t len;char* copy;len = strlen(str) + 1;if (!(copy = (char*)cJSON_malloc(len))) return 0;memcpy(copy,str,len);return copy;
}void cJSON_InitHooks(cJSON_Hooks* hooks)
{if (!hooks) { /* Reset hooks */cJSON_malloc = malloc;cJSON_free = free;return;}cJSON_malloc = (hooks->malloc_fn)?hooks->malloc_fn:malloc;cJSON_free	 = (hooks->free_fn)?hooks->free_fn:free;
}/* Internal constructor. */
static cJSON *cJSON_New_Item(void)
{cJSON* node = (cJSON*)cJSON_malloc(sizeof(cJSON));if (node) memset(node,0,sizeof(cJSON));return node;
}/* Delete a cJSON structure. */
void cJSON_Delete(cJSON *c)
{cJSON *next;while (c){next=c->next;if (!(c->type&cJSON_IsReference) && c->child) cJSON_Delete(c->child);if (!(c->type&cJSON_IsReference) && c->valuestring) cJSON_free(c->valuestring);if (!(c->type&cJSON_StringIsConst) && c->string) cJSON_free(c->string);cJSON_free(c);c=next;}
}/* Parse the input text to generate a number, and populate the result into item. */
static const char *parse_number(cJSON *item,const char *num)
{double n=0,sign=1,scale=0;int subscale=0,signsubscale=1;if (*num=='-') sign=-1,num++;	/* Has sign? */if (*num=='0') num++;			/* is zero */if (*num>='1' && *num<='9')	do	n=(n*10.0)+(*num++ -'0');	while (*num>='0' && *num<='9');	/* Number? */if (*num=='.' && num[1]>='0' && num[1]<='9') {num++;		do	n=(n*10.0)+(*num++ -'0'),scale--; while (*num>='0' && *num<='9');}	/* Fractional part? */if (*num=='e' || *num=='E')		/* Exponent? */{	num++;if (*num=='+') num++;	else if (*num=='-') signsubscale=-1,num++;		/* With sign? */while (*num>='0' && *num<='9') subscale=(subscale*10)+(*num++ - '0');	/* Number? */}n=sign*n*pow(10.0,(scale+subscale*signsubscale));	/* number = +/- number.fraction * 10^+/- exponent */item->valuedouble=n;item->valueint=(int)n;item->type=cJSON_Number;return num;
}static int pow2gt (int x)	{	--x;	x|=x>>1;	x|=x>>2;	x|=x>>4;	x|=x>>8;	x|=x>>16;	return x+1;	}typedef struct {char *buffer; int length; int offset; } printbuffer;static char* ensure(printbuffer *p,int needed)
{char *newbuffer;int newsize;if (!p || !p->buffer) return 0;needed+=p->offset;if (needed<=p->length) return p->buffer+p->offset;newsize=pow2gt(needed);newbuffer=(char*)cJSON_malloc(newsize);if (!newbuffer) {cJSON_free(p->buffer);p->length=0,p->buffer=0;return 0;}if (newbuffer) memcpy(newbuffer,p->buffer,p->length);cJSON_free(p->buffer);p->length=newsize;p->buffer=newbuffer;return newbuffer+p->offset;
}static int update(printbuffer *p)
{char *str;if (!p || !p->buffer) return 0;str=p->buffer+p->offset;return p->offset+strlen(str);
}/* Render the number nicely from the given item into a string. */
static char *print_number(cJSON *item,printbuffer *p)
{char *str=0;double d=item->valuedouble;if (d==0){if (p)	str=ensure(p,2);else	str=(char*)cJSON_malloc(2);	/* special case for 0. */if (str) strcpy(str,"0");}else if (fabs(((double)item->valueint)-d)<=DBL_EPSILON && d<=INT_MAX && d>=INT_MIN){if (p)	str=ensure(p,21);else	str=(char*)cJSON_malloc(21);	/* 2^64+1 can be represented in 21 chars. */if (str)	sprintf(str,"%d",item->valueint);}else{if (p)	str=ensure(p,64);else	str=(char*)cJSON_malloc(64);	/* This is a nice tradeoff. */if (str){if (fabs(floor(d)-d)<=DBL_EPSILON && fabs(d)<1.0e60)sprintf(str,"%.0f",d);else if (fabs(d)<1.0e-6 || fabs(d)>1.0e9)			sprintf(str,"%e",d);else												sprintf(str,"%f",d);}}return str;
}static unsigned parse_hex4(const char *str)
{unsigned h=0;if (*str>='0' && *str<='9') h+=(*str)-'0'; else if (*str>='A' && *str<='F') h+=10+(*str)-'A'; else if (*str>='a' && *str<='f') h+=10+(*str)-'a'; else return 0;h=h<<4;str++;if (*str>='0' && *str<='9') h+=(*str)-'0'; else if (*str>='A' && *str<='F') h+=10+(*str)-'A'; else if (*str>='a' && *str<='f') h+=10+(*str)-'a'; else return 0;h=h<<4;str++;if (*str>='0' && *str<='9') h+=(*str)-'0'; else if (*str>='A' && *str<='F') h+=10+(*str)-'A'; else if (*str>='a' && *str<='f') h+=10+(*str)-'a'; else return 0;h=h<<4;str++;if (*str>='0' && *str<='9') h+=(*str)-'0'; else if (*str>='A' && *str<='F') h+=10+(*str)-'A'; else if (*str>='a' && *str<='f') h+=10+(*str)-'a'; else return 0;return h;
}/* Parse the input text into an unescaped cstring, and populate item. */
static const unsigned char firstByteMark[7] = { 0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
static const char *parse_string(cJSON *item,const char *str)
{const char *ptr=str+1;char *ptr2;char *out;int len=0;unsigned uc,uc2;if (*str!='\"') {ep=str;return 0;}	/* not a string! */while (*ptr!='\"' && *ptr && ++len) if (*ptr++ == '\\') ptr++;	/* Skip escaped quotes. */out=(char*)cJSON_malloc(len+1);	/* This is how long we need for the string, roughly. */if (!out) return 0;ptr=str+1;ptr2=out;while (*ptr!='\"' && *ptr){if (*ptr!='\\') *ptr2++=*ptr++;else{ptr++;switch (*ptr){case 'b': *ptr2++='\b';	break;case 'f': *ptr2++='\f';	break;case 'n': *ptr2++='\n';	break;case 'r': *ptr2++='\r';	break;case 't': *ptr2++='\t';	break;case 'u':	 /* transcode utf16 to utf8. */uc=parse_hex4(ptr+1);ptr+=4;	/* get the unicode char. */if ((uc>=0xDC00 && uc<=0xDFFF) || uc==0)	break;	/* check for invalid.	*/if (uc>=0xD800 && uc<=0xDBFF)	/* UTF16 surrogate pairs.	*/{if (ptr[1]!='\\' || ptr[2]!='u')	break;	/* missing second-half of surrogate.	*/uc2=parse_hex4(ptr+3);ptr+=6;if (uc2<0xDC00 || uc2>0xDFFF)		break;	/* invalid second-half of surrogate.	*/uc=0x10000 + (((uc&0x3FF)<<10) | (uc2&0x3FF));}len=4;if (uc<0x80) len=1;else if (uc<0x800) len=2;else if (uc<0x10000) len=3; ptr2+=len;switch (len) {case 4: *--ptr2 =((uc | 0x80) & 0xBF); uc >>= 6;case 3: *--ptr2 =((uc | 0x80) & 0xBF); uc >>= 6;case 2: *--ptr2 =((uc | 0x80) & 0xBF); uc >>= 6;case 1: *--ptr2 =(uc | firstByteMark[len]);}ptr2+=len;break;default:  *ptr2++=*ptr; break;}ptr++;}}*ptr2=0;if (*ptr=='\"') ptr++;item->valuestring=out;item->type=cJSON_String;return ptr;
}/* Render the cstring provided to an escaped version that can be printed. */
static char *print_string_ptr(const char *str,printbuffer *p)
{const char *ptr;char *ptr2,*out;int len=0,flag=0;unsigned char token;for (ptr=str;*ptr;ptr++) flag|=((*ptr>0 && *ptr<32)||(*ptr=='\"')||(*ptr=='\\'))?1:0;if (!flag){len=ptr-str;if (p) out=ensure(p,len+3);else		out=(char*)cJSON_malloc(len+3);if (!out) return 0;ptr2=out;*ptr2++='\"';strcpy(ptr2,str);ptr2[len]='\"';ptr2[len+1]=0;return out;}if (!str){if (p)	out=ensure(p,3);else	out=(char*)cJSON_malloc(3);if (!out) return 0;strcpy(out,"\"\"");return out;}ptr=str;while ((token=*ptr) && ++len) {if (strchr("\"\\\b\f\n\r\t",token)) len++; else if (token<32) len+=5;ptr++;}if (p)	out=ensure(p,len+3);else	out=(char*)cJSON_malloc(len+3);if (!out) return 0;ptr2=out;ptr=str;*ptr2++='\"';while (*ptr){if ((unsigned char)*ptr>31 && *ptr!='\"' && *ptr!='\\') *ptr2++=*ptr++;else{*ptr2++='\\';switch (token=*ptr++){case '\\':	*ptr2++='\\';	break;case '\"':	*ptr2++='\"';	break;case '\b':	*ptr2++='b';	break;case '\f':	*ptr2++='f';	break;case '\n':	*ptr2++='n';	break;case '\r':	*ptr2++='r';	break;case '\t':	*ptr2++='t';	break;default: sprintf(ptr2,"u%04x",token);ptr2+=5;	break;	/* escape and print */}}}*ptr2++='\"';*ptr2++=0;return out;
}
/* Invote print_string_ptr (which is useful) on an item. */
static char *print_string(cJSON *item,printbuffer *p)	{return print_string_ptr(item->valuestring,p);}/* Predeclare these prototypes. */
static const char *parse_value(cJSON *item,const char *value);
static char *print_value(cJSON *item,int depth,int fmt,printbuffer *p);
static const char *parse_array(cJSON *item,const char *value);
static char *print_array(cJSON *item,int depth,int fmt,printbuffer *p);
static const char *parse_object(cJSON *item,const char *value);
static char *print_object(cJSON *item,int depth,int fmt,printbuffer *p);/* Utility to jump whitespace and cr/lf */
static const char *skip(const char *in) {while (in && *in && (unsigned char)*in<=32) in++; return in;}/* Parse an object - create a new root, and populate. */
cJSON *cJSON_ParseWithOpts(const char *value,const char **return_parse_end,int require_null_terminated)
{const char *end=0;cJSON *c=cJSON_New_Item();ep=0;if (!c) return 0;       /* memory fail */end=parse_value(c,skip(value));if (!end)	{cJSON_Delete(c);return 0;}	/* parse failure. ep is set. *//* if we require null-terminated JSON without appended garbage, skip and then check for a null terminator */if (require_null_terminated) {end=skip(end);if (*end) {cJSON_Delete(c);ep=end;return 0;}}if (return_parse_end) *return_parse_end=end;return c;
}
/* Default options for cJSON_Parse */
cJSON *cJSON_Parse(const char *value) {return cJSON_ParseWithOpts(value,0,0);}/* Render a cJSON item/entity/structure to text. */
char *cJSON_Print(cJSON *item)				{return print_value(item,0,1,0);}
char *cJSON_PrintUnformatted(cJSON *item)	{return print_value(item,0,0,0);}char *cJSON_PrintBuffered(cJSON *item,int prebuffer,int fmt)
{printbuffer p;p.buffer=(char*)cJSON_malloc(prebuffer);p.length=prebuffer;p.offset=0;return print_value(item,0,fmt,&p);return p.buffer;
}/* Parser core - when encountering text, process appropriately. */
static const char *parse_value(cJSON *item,const char *value)
{if (!value)						return 0;	/* Fail on null. */if (!strncmp(value,"null",4))	{ item->type=cJSON_NULL;  return value+4; }if (!strncmp(value,"false",5))	{ item->type=cJSON_False; return value+5; }if (!strncmp(value,"true",4))	{ item->type=cJSON_True; item->valueint=1;	return value+4; }if (*value=='\"')				{ return parse_string(item,value); }if (*value=='-' || (*value>='0' && *value<='9'))	{ return parse_number(item,value); }if (*value=='[')				{ return parse_array(item,value); }if (*value=='{')				{ return parse_object(item,value); }ep=value;return 0;	/* failure. */
}/* Render a value to text. */
static char *print_value(cJSON *item,int depth,int fmt,printbuffer *p)
{char *out=0;if (!item) return 0;if (p){switch ((item->type)&255){case cJSON_NULL:	{out=ensure(p,5);	if (out) strcpy(out,"null");	break;}case cJSON_False:	{out=ensure(p,6);	if (out) strcpy(out,"false");	break;}case cJSON_True:	{out=ensure(p,5);	if (out) strcpy(out,"true");	break;}case cJSON_Number:	out=print_number(item,p);break;case cJSON_String:	out=print_string(item,p);break;case cJSON_Array:	out=print_array(item,depth,fmt,p);break;case cJSON_Object:	out=print_object(item,depth,fmt,p);break;}}else{switch ((item->type)&255){case cJSON_NULL:	out=cJSON_strdup("null");	break;case cJSON_False:	out=cJSON_strdup("false");break;case cJSON_True:	out=cJSON_strdup("true"); break;case cJSON_Number:	out=print_number(item,0);break;case cJSON_String:	out=print_string(item,0);break;case cJSON_Array:	out=print_array(item,depth,fmt,0);break;case cJSON_Object:	out=print_object(item,depth,fmt,0);break;}}return out;
}/* Build an array from input text. */
static const char *parse_array(cJSON *item,const char *value)
{cJSON *child;if (*value!='[')	{ep=value;return 0;}	/* not an array! */item->type=cJSON_Array;value=skip(value+1);if (*value==']') return value+1;	/* empty array. */item->child=child=cJSON_New_Item();if (!item->child) return 0;		 /* memory fail */value=skip(parse_value(child,skip(value)));	/* skip any spacing, get the value. */if (!value) return 0;while (*value==','){cJSON *new_item;if (!(new_item=cJSON_New_Item())) return 0; 	/* memory fail */child->next=new_item;new_item->prev=child;child=new_item;value=skip(parse_value(child,skip(value+1)));if (!value) return 0;	/* memory fail */}if (*value==']') return value+1;	/* end of array */ep=value;return 0;	/* malformed. */
}/* Render an array to text */
static char *print_array(cJSON *item,int depth,int fmt,printbuffer *p)
{char **entries;char *out=0,*ptr,*ret;int len=5;cJSON *child=item->child;int numentries=0,i=0,fail=0;size_t tmplen=0;/* How many entries in the array? */while (child) numentries++,child=child->next;/* Explicitly handle numentries==0 */if (!numentries){if (p)	out=ensure(p,3);else	out=(char*)cJSON_malloc(3);if (out) strcpy(out,"[]");return out;}if (p){/* Compose the output array. */i=p->offset;ptr=ensure(p,1);if (!ptr) return 0;	*ptr='[';	p->offset++;child=item->child;while (child && !fail){print_value(child,depth+1,fmt,p);p->offset=update(p);if (child->next) {len=fmt?2:1;ptr=ensure(p,len+1);if (!ptr) return 0;*ptr++=',';if(fmt)*ptr++=' ';*ptr=0;p->offset+=len;}child=child->next;}ptr=ensure(p,2);if (!ptr) return 0;	*ptr++=']';*ptr=0;out=(p->buffer)+i;}else{/* Allocate an array to hold the values for each */entries=(char**)cJSON_malloc(numentries*sizeof(char*));if (!entries) return 0;memset(entries,0,numentries*sizeof(char*));/* Retrieve all the results: */child=item->child;while (child && !fail){ret=print_value(child,depth+1,fmt,0);entries[i++]=ret;if (ret) len+=strlen(ret)+2+(fmt?1:0); else fail=1;child=child->next;}/* If we didn't fail, try to malloc the output string */if (!fail)	out=(char*)cJSON_malloc(len);/* If that fails, we fail. */if (!out) fail=1;/* Handle failure. */if (fail){for (i=0;i<numentries;i++) if (entries[i]) cJSON_free(entries[i]);cJSON_free(entries);return 0;}/* Compose the output array. */*out='[';ptr=out+1;*ptr=0;for (i=0;i<numentries;i++){tmplen=strlen(entries[i]);memcpy(ptr,entries[i],tmplen);ptr+=tmplen;if (i!=numentries-1) {*ptr++=',';if(fmt)*ptr++=' ';*ptr=0;}cJSON_free(entries[i]);}cJSON_free(entries);*ptr++=']';*ptr++=0;}return out;	
}/* Build an object from the text. */
static const char *parse_object(cJSON *item,const char *value)
{cJSON *child;if (*value!='{')	{ep=value;return 0;}	/* not an object! */item->type=cJSON_Object;value=skip(value+1);if (*value=='}') return value+1;	/* empty array. */item->child=child=cJSON_New_Item();if (!item->child) return 0;value=skip(parse_string(child,skip(value)));if (!value) return 0;child->string=child->valuestring;child->valuestring=0;if (*value!=':') {ep=value;return 0;}	/* fail! */value=skip(parse_value(child,skip(value+1)));	/* skip any spacing, get the value. */if (!value) return 0;while (*value==','){cJSON *new_item;if (!(new_item=cJSON_New_Item()))	return 0; /* memory fail */child->next=new_item;new_item->prev=child;child=new_item;value=skip(parse_string(child,skip(value+1)));if (!value) return 0;child->string=child->valuestring;child->valuestring=0;if (*value!=':') {ep=value;return 0;}	/* fail! */value=skip(parse_value(child,skip(value+1)));	/* skip any spacing, get the value. */if (!value) return 0;}if (*value=='}') return value+1;	/* end of array */ep=value;return 0;	/* malformed. */
}/* Render an object to text. */
static char *print_object(cJSON *item,int depth,int fmt,printbuffer *p)
{char **entries=0,**names=0;char *out=0,*ptr,*ret,*str;int len=7,i=0,j;cJSON *child=item->child;int numentries=0,fail=0;size_t tmplen=0;/* Count the number of entries. */while (child) numentries++,child=child->next;/* Explicitly handle empty object case */if (!numentries){if (p) out=ensure(p,fmt?depth+4:3);else	out=(char*)cJSON_malloc(fmt?depth+4:3);if (!out)	return 0;ptr=out;*ptr++='{';if (fmt) {*ptr++='\n';for (i=0;i<depth-1;i++) *ptr++='\t';}*ptr++='}';*ptr++=0;return out;}if (p){/* Compose the output: */i=p->offset;len=fmt?2:1;	ptr=ensure(p,len+1);	if (!ptr) return 0;*ptr++='{';	if (fmt) *ptr++='\n';	*ptr=0;	p->offset+=len;child=item->child;depth++;while (child){if (fmt){ptr=ensure(p,depth);	if (!ptr) return 0;for (j=0;j<depth;j++) *ptr++='\t';p->offset+=depth;}print_string_ptr(child->string,p);p->offset=update(p);len=fmt?2:1;ptr=ensure(p,len);	if (!ptr) return 0;*ptr++=':';if (fmt) *ptr++='\t';p->offset+=len;print_value(child,depth,fmt,p);p->offset=update(p);len=(fmt?1:0)+(child->next?1:0);ptr=ensure(p,len+1); if (!ptr) return 0;if (child->next) *ptr++=',';if (fmt) *ptr++='\n';*ptr=0;p->offset+=len;child=child->next;}ptr=ensure(p,fmt?(depth+1):2);	 if (!ptr) return 0;if (fmt)	for (i=0;i<depth-1;i++) *ptr++='\t';*ptr++='}';*ptr=0;out=(p->buffer)+i;}else{/* Allocate space for the names and the objects */entries=(char**)cJSON_malloc(numentries*sizeof(char*));if (!entries) return 0;names=(char**)cJSON_malloc(numentries*sizeof(char*));if (!names) {cJSON_free(entries);return 0;}memset(entries,0,sizeof(char*)*numentries);memset(names,0,sizeof(char*)*numentries);/* Collect all the results into our arrays: */child=item->child;depth++;if (fmt) len+=depth;while (child){names[i]=str=print_string_ptr(child->string,0);entries[i++]=ret=print_value(child,depth,fmt,0);if (str && ret) len+=strlen(ret)+strlen(str)+2+(fmt?2+depth:0); else fail=1;child=child->next;}/* Try to allocate the output string */if (!fail)	out=(char*)cJSON_malloc(len);if (!out) fail=1;/* Handle failure */if (fail){for (i=0;i<numentries;i++) {if (names[i]) cJSON_free(names[i]);if (entries[i]) cJSON_free(entries[i]);}cJSON_free(names);cJSON_free(entries);return 0;}/* Compose the output: */*out='{';ptr=out+1;if (fmt)*ptr++='\n';*ptr=0;for (i=0;i<numentries;i++){if (fmt) for (j=0;j<depth;j++) *ptr++='\t';tmplen=strlen(names[i]);memcpy(ptr,names[i],tmplen);ptr+=tmplen;*ptr++=':';if (fmt) *ptr++='\t';strcpy(ptr,entries[i]);ptr+=strlen(entries[i]);if (i!=numentries-1) *ptr++=',';if (fmt) *ptr++='\n';*ptr=0;cJSON_free(names[i]);cJSON_free(entries[i]);}cJSON_free(names);cJSON_free(entries);if (fmt) for (i=0;i<depth-1;i++) *ptr++='\t';*ptr++='}';*ptr++=0;}return out;	
}/* Get Array size/item / object item. */
int    cJSON_GetArraySize(cJSON *array)							{cJSON *c=array->child;int i=0;while(c)i++,c=c->next;return i;}
cJSON *cJSON_GetArrayItem(cJSON *array,int item)				{cJSON *c=array->child;  while (c && item>0) item--,c=c->next; return c;}
cJSON *cJSON_GetObjectItem(cJSON *object,const char *string)	{cJSON *c=object->child; while (c && cJSON_strcasecmp(c->string,string)) c=c->next; return c;}/* Utility for array list handling. */
static void suffix_object(cJSON *prev,cJSON *item) {prev->next=item;item->prev=prev;}
/* Utility for handling references. */
static cJSON *create_reference(cJSON *item) {cJSON *ref=cJSON_New_Item();if (!ref) return 0;memcpy(ref,item,sizeof(cJSON));ref->string=0;ref->type|=cJSON_IsReference;ref->next=ref->prev=0;return ref;}/* Add item to array/object. */
void   cJSON_AddItemToArray(cJSON *array, cJSON *item)						{cJSON *c=array->child;if (!item) return; if (!c) {array->child=item;} else {while (c && c->next) c=c->next; suffix_object(c,item);}}
void   cJSON_AddItemToObject(cJSON *object,const char *string,cJSON *item)	{if (!item) return; if (item->string) cJSON_free(item->string);item->string=cJSON_strdup(string);cJSON_AddItemToArray(object,item);}
void   cJSON_AddItemToObjectCS(cJSON *object,const char *string,cJSON *item)	{if (!item) return; if (!(item->type&cJSON_StringIsConst) && item->string) cJSON_free(item->string);item->string=(char*)string;item->type|=cJSON_StringIsConst;cJSON_AddItemToArray(object,item);}
void	cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item)						{cJSON_AddItemToArray(array,create_reference(item));}
void	cJSON_AddItemReferenceToObject(cJSON *object,const char *string,cJSON *item)	{cJSON_AddItemToObject(object,string,create_reference(item));}cJSON *cJSON_DetachItemFromArray(cJSON *array,int which)			{cJSON *c=array->child;while (c && which>0) c=c->next,which--;if (!c) return 0;if (c->prev) c->prev->next=c->next;if (c->next) c->next->prev=c->prev;if (c==array->child) array->child=c->next;c->prev=c->next=0;return c;}
void   cJSON_DeleteItemFromArray(cJSON *array,int which)			{cJSON_Delete(cJSON_DetachItemFromArray(array,which));}
cJSON *cJSON_DetachItemFromObject(cJSON *object,const char *string) {int i=0;cJSON *c=object->child;while (c && cJSON_strcasecmp(c->string,string)) i++,c=c->next;if (c) return cJSON_DetachItemFromArray(object,i);return 0;}
void   cJSON_DeleteItemFromObject(cJSON *object,const char *string) {cJSON_Delete(cJSON_DetachItemFromObject(object,string));}/* Replace array/object items with new ones. */
void   cJSON_InsertItemInArray(cJSON *array,int which,cJSON *newitem)		{cJSON *c=array->child;while (c && which>0) c=c->next,which--;if (!c) {cJSON_AddItemToArray(array,newitem);return;}newitem->next=c;newitem->prev=c->prev;c->prev=newitem;if (c==array->child) array->child=newitem; else newitem->prev->next=newitem;}
void   cJSON_ReplaceItemInArray(cJSON *array,int which,cJSON *newitem)		{cJSON *c=array->child;while (c && which>0) c=c->next,which--;if (!c) return;newitem->next=c->next;newitem->prev=c->prev;if (newitem->next) newitem->next->prev=newitem;if (c==array->child) array->child=newitem; else newitem->prev->next=newitem;c->next=c->prev=0;cJSON_Delete(c);}
void   cJSON_ReplaceItemInObject(cJSON *object,const char *string,cJSON *newitem){int i=0;cJSON *c=object->child;while(c && cJSON_strcasecmp(c->string,string))i++,c=c->next;if(c){newitem->string=cJSON_strdup(string);cJSON_ReplaceItemInArray(object,i,newitem);}}/* Create basic types: */
cJSON *cJSON_CreateNull(void)					{cJSON *item=cJSON_New_Item();if(item)item->type=cJSON_NULL;return item;}
cJSON *cJSON_CreateTrue(void)					{cJSON *item=cJSON_New_Item();if(item)item->type=cJSON_True;return item;}
cJSON *cJSON_CreateFalse(void)					{cJSON *item=cJSON_New_Item();if(item)item->type=cJSON_False;return item;}
cJSON *cJSON_CreateBool(int b)					{cJSON *item=cJSON_New_Item();if(item)item->type=b?cJSON_True:cJSON_False;return item;}
cJSON *cJSON_CreateNumber(double num)			{cJSON *item=cJSON_New_Item();if(item){item->type=cJSON_Number;item->valuedouble=num;item->valueint=(int)num;}return item;}
cJSON *cJSON_CreateString(const char *string)	{cJSON *item=cJSON_New_Item();if(item){item->type=cJSON_String;item->valuestring=cJSON_strdup(string);}return item;}
cJSON *cJSON_CreateArray(void)					{cJSON *item=cJSON_New_Item();if(item)item->type=cJSON_Array;return item;}
cJSON *cJSON_CreateObject(void)					{cJSON *item=cJSON_New_Item();if(item)item->type=cJSON_Object;return item;}/* Create Arrays: */
cJSON *cJSON_CreateIntArray(const int *numbers,int count)		{int i;cJSON *n=0,*p=0,*a=cJSON_CreateArray();for(i=0;a && i<count;i++){n=cJSON_CreateNumber(numbers[i]);if(!i)a->child=n;else suffix_object(p,n);p=n;}return a;}
cJSON *cJSON_CreateFloatArray(const float *numbers,int count)	{int i;cJSON *n=0,*p=0,*a=cJSON_CreateArray();for(i=0;a && i<count;i++){n=cJSON_CreateNumber(numbers[i]);if(!i)a->child=n;else suffix_object(p,n);p=n;}return a;}
cJSON *cJSON_CreateDoubleArray(const double *numbers,int count)	{int i;cJSON *n=0,*p=0,*a=cJSON_CreateArray();for(i=0;a && i<count;i++){n=cJSON_CreateNumber(numbers[i]);if(!i)a->child=n;else suffix_object(p,n);p=n;}return a;}
cJSON *cJSON_CreateStringArray(const char **strings,int count)	{int i;cJSON *n=0,*p=0,*a=cJSON_CreateArray();for(i=0;a && i<count;i++){n=cJSON_CreateString(strings[i]);if(!i)a->child=n;else suffix_object(p,n);p=n;}return a;}/* Duplication */
cJSON *cJSON_Duplicate(cJSON *item,int recurse)
{cJSON *newitem,*cptr,*nptr=0,*newchild;/* Bail on bad ptr */if (!item) return 0;/* Create new item */newitem=cJSON_New_Item();if (!newitem) return 0;/* Copy over all vars */newitem->type=item->type&(~cJSON_IsReference),newitem->valueint=item->valueint,newitem->valuedouble=item->valuedouble;if (item->valuestring)	{newitem->valuestring=cJSON_strdup(item->valuestring);	if (!newitem->valuestring)	{cJSON_Delete(newitem);return 0;}}if (item->string)		{newitem->string=cJSON_strdup(item->string);			if (!newitem->string)		{cJSON_Delete(newitem);return 0;}}/* If non-recursive, then we're done! */if (!recurse) return newitem;/* Walk the ->next chain for the child. */cptr=item->child;while (cptr){newchild=cJSON_Duplicate(cptr,1);		/* Duplicate (with recurse) each item in the ->next chain */if (!newchild) {cJSON_Delete(newitem);return 0;}if (nptr)	{nptr->next=newchild,newchild->prev=nptr;nptr=newchild;}	/* If newitem->child already set, then crosswire ->prev and ->next and move on */else		{newitem->child=newchild;nptr=newchild;}					/* Set newitem->child and move to it */cptr=cptr->next;}return newitem;
}void cJSON_Minify(char *json)
{char *into=json;while (*json){if (*json==' ') json++;else if (*json=='\t') json++;	/* Whitespace characters. */else if (*json=='\r') json++;else if (*json=='\n') json++;else if (*json=='/' && json[1]=='/')  while (*json && *json!='\n') json++;	/* double-slash comments, to end of line. */else if (*json=='/' && json[1]=='*') {while (*json && !(*json=='*' && json[1]=='/')) json++;json+=2;}	/* multiline comments. */else if (*json=='\"'){*into++=*json++;while (*json && *json!='\"'){if (*json=='\\') *into++=*json++;*into++=*json++;}*into++=*json++;} /* string literals, which are \" sensitive. */else *into++=*json++;			/* All other characters. */}*into=0;	/* and null-terminate. */
}

????????cJSON.h?

/*Copyright (c) 2009 Dave GamblePermission is hereby granted, free of charge, to any person obtaining a copyof this software and associated documentation files (the "Software"), to dealin the Software without restriction, including without limitation the rightsto use, copy, modify, merge, publish, distribute, sublicense, and/or sellcopies of the Software, and to permit persons to whom the Software isfurnished to do so, subject to the following conditions:The above copyright notice and this permission notice shall be included inall copies or substantial portions of the Software.THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS ORIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THEAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHERLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS INTHE SOFTWARE.
*/#ifndef cJSON__h
#define cJSON__h#ifdef __cplusplus
extern "C"
{
#endif/* cJSON Types: */
#define cJSON_False 0
#define cJSON_True 1
#define cJSON_NULL 2
#define cJSON_Number 3
#define cJSON_String 4
#define cJSON_Array 5
#define cJSON_Object 6#define cJSON_IsReference 256
#define cJSON_StringIsConst 512/* The cJSON structure: */
typedef struct cJSON {struct cJSON *next,*prev;	/* next/prev allow you to walk array/object chains. Alternatively, use GetArraySize/GetArrayItem/GetObjectItem */struct cJSON *child;		/* An array or object item will have a child pointer pointing to a chain of the items in the array/object. */int type;					/* The type of the item, as above. */char *valuestring;			/* The item's string, if type==cJSON_String */int valueint;				/* The item's number, if type==cJSON_Number */double valuedouble;			/* The item's number, if type==cJSON_Number */char *string;				/* The item's name string, if this item is the child of, or is in the list of subitems of an object. */
} cJSON;typedef struct cJSON_Hooks {void *(*malloc_fn)(size_t sz);void (*free_fn)(void *ptr);
} cJSON_Hooks;/* Supply malloc, realloc and free functions to cJSON */
extern void cJSON_InitHooks(cJSON_Hooks* hooks);/* Supply a block of JSON, and this returns a cJSON object you can interrogate. Call cJSON_Delete when finished. */
extern cJSON *cJSON_Parse(const char *value);
/* Render a cJSON entity to text for transfer/storage. Free the char* when finished. */
extern char  *cJSON_Print(cJSON *item);
/* Render a cJSON entity to text for transfer/storage without any formatting. Free the char* when finished. */
extern char  *cJSON_PrintUnformatted(cJSON *item);
/* Render a cJSON entity to text using a buffered strategy. prebuffer is a guess at the final size. guessing well reduces reallocation. fmt=0 gives unformatted, =1 gives formatted */
extern char *cJSON_PrintBuffered(cJSON *item,int prebuffer,int fmt);
/* Delete a cJSON entity and all subentities. */
extern void   cJSON_Delete(cJSON *c);/* Returns the number of items in an array (or object). */
extern int	  cJSON_GetArraySize(cJSON *array);
/* Retrieve item number "item" from array "array". Returns NULL if unsuccessful. */
extern cJSON *cJSON_GetArrayItem(cJSON *array,int item);
/* Get item "string" from object. Case insensitive. */
extern cJSON *cJSON_GetObjectItem(cJSON *object,const char *string);/* For analysing failed parses. This returns a pointer to the parse error. You'll probably need to look a few chars back to make sense of it. Defined when cJSON_Parse() returns 0. 0 when cJSON_Parse() succeeds. */
extern const char *cJSON_GetErrorPtr(void);/* These calls create a cJSON item of the appropriate type. */
extern cJSON *cJSON_CreateNull(void);
extern cJSON *cJSON_CreateTrue(void);
extern cJSON *cJSON_CreateFalse(void);
extern cJSON *cJSON_CreateBool(int b);
extern cJSON *cJSON_CreateNumber(double num);
extern cJSON *cJSON_CreateString(const char *string);
extern cJSON *cJSON_CreateArray(void);
extern cJSON *cJSON_CreateObject(void);/* These utilities create an Array of count items. */
extern cJSON *cJSON_CreateIntArray(const int *numbers,int count);
extern cJSON *cJSON_CreateFloatArray(const float *numbers,int count);
extern cJSON *cJSON_CreateDoubleArray(const double *numbers,int count);
extern cJSON *cJSON_CreateStringArray(const char **strings,int count);/* Append item to the specified array/object. */
extern void cJSON_AddItemToArray(cJSON *array, cJSON *item);
extern void	cJSON_AddItemToObject(cJSON *object,const char *string,cJSON *item);
extern void	cJSON_AddItemToObjectCS(cJSON *object,const char *string,cJSON *item);	/* Use this when string is definitely const (i.e. a literal, or as good as), and will definitely survive the cJSON object */
/* Append reference to item to the specified array/object. Use this when you want to add an existing cJSON to a new cJSON, but don't want to corrupt your existing cJSON. */
extern void cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item);
extern void	cJSON_AddItemReferenceToObject(cJSON *object,const char *string,cJSON *item);/* Remove/Detatch items from Arrays/Objects. */
extern cJSON *cJSON_DetachItemFromArray(cJSON *array,int which);
extern void   cJSON_DeleteItemFromArray(cJSON *array,int which);
extern cJSON *cJSON_DetachItemFromObject(cJSON *object,const char *string);
extern void   cJSON_DeleteItemFromObject(cJSON *object,const char *string);/* Update array items. */
extern void cJSON_InsertItemInArray(cJSON *array,int which,cJSON *newitem);	/* Shifts pre-existing items to the right. */
extern void cJSON_ReplaceItemInArray(cJSON *array,int which,cJSON *newitem);
extern void cJSON_ReplaceItemInObject(cJSON *object,const char *string,cJSON *newitem);/* Duplicate a cJSON item */
extern cJSON *cJSON_Duplicate(cJSON *item,int recurse);
/* Duplicate will create a new, identical cJSON item to the one you pass, in new memory that will
need to be released. With recurse!=0, it will duplicate any children connected to the item.
The item->next and ->prev pointers are always zero on return from Duplicate. *//* ParseWithOpts allows you to require (and check) that the JSON is null terminated, and to retrieve the pointer to the final byte parsed. */
extern cJSON *cJSON_ParseWithOpts(const char *value,const char **return_parse_end,int require_null_terminated);extern void cJSON_Minify(char *json);/* Macros for creating things quickly. */
#define cJSON_AddNullToObject(object,name)		cJSON_AddItemToObject(object, name, cJSON_CreateNull())
#define cJSON_AddTrueToObject(object,name)		cJSON_AddItemToObject(object, name, cJSON_CreateTrue())
#define cJSON_AddFalseToObject(object,name)		cJSON_AddItemToObject(object, name, cJSON_CreateFalse())
#define cJSON_AddBoolToObject(object,name,b)	cJSON_AddItemToObject(object, name, cJSON_CreateBool(b))
#define cJSON_AddNumberToObject(object,name,n)	cJSON_AddItemToObject(object, name, cJSON_CreateNumber(n))
#define cJSON_AddStringToObject(object,name,s)	cJSON_AddItemToObject(object, name, cJSON_CreateString(s))/* When assigning an integer value, it needs to be propagated to valuedouble too. */
#define cJSON_SetIntValue(object,val)			((object)?(object)->valueint=(object)->valuedouble=(val):(val))
#define cJSON_SetNumberValue(object,val)		((object)?(object)->valueint=(object)->valuedouble=(val):(val))#ifdef __cplusplus
}
#endif#endif

? ? ? ? 使用方法：

????????就按照創(chuàng)建一個(gè)點(diǎn)亮LED燈工程那樣，新建源文件和頭文件，把這兩段代碼直接復(fù)制進(jìn)去即可正常調(diào)用

七、工程源碼

????????下面這篇文章中是一個(gè)未使用cJSON構(gòu)建的，大家下載下來后可以按照上述步驟操作一下，畢竟實(shí)踐才是檢驗(yàn)真理的唯一標(biāo)準(zhǔn)，需要構(gòu)建完成的，也可以后臺(tái)私信我? ? ? ??

STM32+ESP8266+MQTT協(xié)議連接阿里云實(shí)現(xiàn)溫濕度上傳https://mp.csdn.net/mp_blog/creation/editor/141951792