On esp8266, use cjson data formats, encapsulation json, failure detection using cJSON_AddNumberToObject add a numeric type, print data after encapsulation, empty, add the string types can be again, on a Windows platform with vs2015 tested cjson, also is no problem, occurs in esp8266 key corresponding value is empty, code printing results, as shown in the figure shown below

 cJSON * root=NULL; 
Char * out=NULL; 
Root=cJSON_CreateObject (); 
If (NULL==root) printf (" cJSON_CreateObject err \ n "); 
CJSON_AddNumberToObject (root, "type", 2); 
CJSON_AddNumberToObject (root, "errorCode", code); 
CJSON_AddStringToObject (root, "STR", "STR"); 

Out=cJSON_Print (root); 
If (NULL==out) printf (" cJSON_Print err "); 
CJSON_Delete (root); 

SendToUart ((unsigned char *) out, strlen (out)); 
Send: printf (" % s \ n ", out); 
Free (out); 

CodePudding user response:

CJson libraries may not achieve cJSON_AddNumberToObject (source code is not found in the function), you can first

CJSON * cJSON_CreateNumber (double num) data object, then the
cJSON_AddItemToObjec

CodePudding user response:

Thank you for your reply, although the problem not solve, I tried, is also not