Esp8266---json---c function library provides string functions

Preface

8266 How to create and parse strings

First, according to what we want to create json Trees

/* 【JSON_Tree】
//**************************************************************************
	{
    	"Shanghai":
    	{
        	"temp": "30℃",
        	"humid": "30%RH"
    	},

    	"Shenzhen":
    	{
        	"temp": "35℃",
        	"humid": 50
		},

    	"result": "Shenzhen is too hot!"
	}

Set up json The tree format string replaces the value corresponding to the key to be assigned with format characters , After that, I will send them one by one One assignment

Tips ：c In language, double quotation marks are used to represent strings , If you want to display double quotation marks in the string , Then you need to add the escape character mark in front ----- That is, slashes \,

#define		JSON_Tree_Format	" { \n "								\
    								" \"Shanghai\": \n "				\
									" { \n "							\
        								" \"temp\": \"%s\", \n "		\
										" \"humid\": \"%s\" \n "		\
    								" }, \n "							\
																		\
									" \"Shenzhen\": \n "				\
									" { \n "							\
    									" \"temp\": \"%s\", \n "		\
										" \"humid\": %s \n "			\
    								" }, \n "							\
																		\
									" \"result\": \"%s\" \n "			\
								" } \n "

First create JSON Trees

//  establish JSON Trees 
//===================================================================================================
void ICACHE_FLASH_ATTR Setup_JSON_Tree_JX(void)
{

	//  assignment JSON Trees 【 assignment JSON_Tree_Format Format characters in string 】
	//--------------------------------------------------------------------------------------------
	os_sprintf(A_JSON_Tree, JSON_Tree_Format, "30℃","30%RH","35℃","50","Shenzhen is too hot!");

	os_printf("\r\n--------------------  establish JSON Trees  -------------------\r\n");

	os_printf("%s",A_JSON_Tree);	//  Serial printing JSON Trees 

	os_printf("\r\n--------------------  establish JSON Trees  -------------------\r\n");
}

call c Functions in the library os_sprintf(A_JSON_Tree, JSON_Tree_Format, "30℃","30%RH","35℃","50","Shenzhen is too hot!"); To format a string , take json The value one in the tree format string One assignment

json After creation , Serial printing json Trees

analysis JSON Trees  

Next use c Other string functions in the function library are required to parse json Keys and values in the tree

//  analysis JSON Trees 
//===================================================================================================
int ICACHE_FLASH_ATTR Parse_JSON_Tree_JX(void)
{
	os_printf("\r\n--------------------  analysis JSON Trees  -------------------\r\n");

	char A_JSONTree_Value[64] = {0};	// JSON Data cache array 

	char * T_Pointer_Head = NULL;		//  Temporary pointer 
	char * T_Pointer_end = NULL;		//  Temporary pointer 

	u8 T_Value_Len = 0;					// 【" value "】 The length of 


	// 【"Shanghai"】
	//………………………………………………………………………………………………………………
	T_Pointer_Head = os_strstr(A_JSON_Tree, "\"Shanghai\"");		// 【"Shanghai"】
	os_printf("Shanghai:\n");

//	T_Pointer_Head = os_strstr(T_Pointer_Head, ":");				// 【:】
//	T_Pointer_Head = os_strstr(T_Pointer_Head, "{");				// 【{】
	T_Pointer_Head = os_strstr(T_Pointer_Head, "\"temp\"");			// 【"temp"】
	T_Pointer_Head = os_strstr(T_Pointer_Head, ":");				// 【:】
	T_Pointer_Head = os_strstr(T_Pointer_Head, "\"") + 1;			// 【 The first pointer of the value 】
	T_Pointer_end = os_strstr(T_Pointer_Head, "\"");				// 【" value " Tail "】
	T_Value_Len = T_Pointer_end - T_Pointer_Head;					//  Calculation 【 value 】 The length of 
	os_memcpy(A_JSONTree_Value, T_Pointer_Head, T_Value_Len);		//  obtain 【 value 】
	A_JSONTree_Value[T_Value_Len] = '\0';							// 【 Add after value '\0'】
	os_printf("\t temp:%s\n",A_JSONTree_Value);


//	T_Pointer_Head = os_strstr(T_Pointer_Head, ",");				// 【,】
//	T_Pointer_Head = os_strstr(T_Pointer_Head, "\"");				// 【\"】
	T_Pointer_Head = os_strstr(T_Pointer_Head, "\"humid\"");		// 【"humid"】
	T_Pointer_Head = os_strstr(T_Pointer_Head, ":");				// 【:】
	T_Pointer_Head = os_strstr(T_Pointer_Head, "\"") + 1;			// 【 The first pointer of the value 】
	T_Pointer_end = os_strstr(T_Pointer_Head, "\"");				// 【" value " Tail "】
	T_Value_Len = T_Pointer_end - T_Pointer_Head;					//  Calculation 【 value 】 The length of 
	os_memcpy(A_JSONTree_Value, T_Pointer_Head, T_Value_Len);		//  obtain 【 value 】
	A_JSONTree_Value[T_Value_Len] = '\0';							// 【 Add after value '\0'】
	os_printf("\t humid:%s\n",A_JSONTree_Value);

	//	T_Pointer_Head = os_strstr(T_Pointer_Head, "}");			// 【}】
	//	T_Pointer_Head = os_strstr(T_Pointer_Head, ",");			// 【,】
	//………………………………………………………………………………………………………………


	// 【"Shenzhen"】
	//………………………………………………………………………………………………………………
	T_Pointer_Head = os_strstr(T_Pointer_Head, "\"Shenzhen\"");		// 【"Shenzhen"】
	os_printf("Shenzhen:\n");

//	T_Pointer_Head = os_strstr(T_Pointer_Head, ":");				// 【:】
//	T_Pointer_Head = os_strstr(T_Pointer_Head, "{");				// 【{】
	T_Pointer_Head = os_strstr(T_Pointer_Head, "\"temp\"");			// 【"temp"】
	T_Pointer_Head = os_strstr(T_Pointer_Head, ":");				// 【:】
	T_Pointer_Head = os_strstr(T_Pointer_Head, "\"") + 1;			// 【 The first pointer of the value 】
	T_Pointer_end = os_strstr(T_Pointer_Head, "\"");				// 【" value " Tail "】
	T_Value_Len = T_Pointer_end - T_Pointer_Head;					//  Calculation 【 value 】 The length of 
	os_memcpy(A_JSONTree_Value, T_Pointer_Head, T_Value_Len);		//  obtain 【 value 】
	A_JSONTree_Value[T_Value_Len] = '\0';							// 【 Add after value '\0'】
	os_printf("\t temp:%s\n",A_JSONTree_Value);


	//【 notes ："humid" The value corresponding to the key is a number . Numbers are also made up of ASSIC Code said , But no ""】
	//……………………………………………………………………………………………………
//	T_Pointer_Head = os_strstr(T_Pointer_Head, ",");				// 【,】
//	T_Pointer_Head = os_strstr(T_Pointer_Head, "\"");				// 【\"】
	T_Pointer_Head = os_strstr(T_Pointer_Head, "\"humid\"");		// 【"humid"】
	T_Pointer_Head = os_strstr(T_Pointer_Head, ":");				// 【:】

	//  Get the first pointer of the number 【 Numbers are in decimal form , And there's no ""】
	//-----------------------------------------------------
	while(*T_Pointer_Head < '0' || *T_Pointer_Head > '9')	//  The exclusion is not in 【0～9】 Characters in range 
		T_Pointer_Head ++ ;

	T_Pointer_end = T_Pointer_Head;	//  Set the initial value of the digit tail pointer 

	//  Get the tail pointer of the number +1【 Numbers are in decimal form , And there's no ""】
	//-----------------------------------------------------
	while(*T_Pointer_end >= '0' && *T_Pointer_end <= '9')	//  Calculated at 【0～9】 Characters in range 
		T_Pointer_end ++ ;

	T_Value_Len = T_Pointer_end - T_Pointer_Head;					//  Calculation 【 value ( Numbers )】 The length of 
	os_memcpy(A_JSONTree_Value, T_Pointer_Head, T_Value_Len);		//  obtain 【 value ( Numbers )】
	A_JSONTree_Value[T_Value_Len] = '\0';							// 【 Add after value '\0'】
	os_printf("\t humid:%s\n",A_JSONTree_Value);

//	T_Pointer_Head = os_strstr(T_Pointer_Head, "}");				// 【}】
//	T_Pointer_Head = os_strstr(T_Pointer_Head, ",");				// 【,】
	//………………………………………………………………………………………………………………

	// 【"result"】
	//………………………………………………………………………………………………………………
	T_Pointer_Head = os_strstr(T_Pointer_Head, "\"result\"");		// 【"result"】
	T_Pointer_Head = os_strstr(T_Pointer_Head, ":");				// 【:】
	T_Pointer_Head = os_strstr(T_Pointer_Head, "\"") + 1;			// 【 The first pointer of the value 】
	T_Pointer_end = os_strstr(T_Pointer_Head, "\"");				// 【" value " Tail "】
	T_Value_Len = T_Pointer_end - T_Pointer_Head;					//  Calculation 【 value 】 The length of 
	os_memcpy(A_JSONTree_Value, T_Pointer_Head, T_Value_Len);		//  obtain 【 value 】
	A_JSONTree_Value[T_Value_Len] = '\0';							// 【 Add after value '\0'】
	os_printf("result:%s\n",A_JSONTree_Value);

	T_Pointer_Head = os_strstr(T_Pointer_Head, "}");			// 【}】
	//………………………………………………………………………………………………………………

    os_printf("\r\n--------------------  analysis JSON Trees  -------------------\r\n");

    return 0 ;
}

explain 8266 Successful use of c String function in function library , Created json Tree and parsing json Trees