+usefull function

cJSON.c

@@ -661,6 +661,17 @@ static char *print_object(cJSON *item,int depth,int fmt,printbuffer *p)
 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;}
+int *cJSON_HasObjectItem(cJSON *object,const char *string)	{
+	cJSON *c=object->child;
+	while (c )
+	{
+		if(cJSON_strcasecmp(c->string,string)==0){
+			return 1;
+		}
+	c=c->next;
+	}
+	return 0;
+}
 
 /* Utility for array list handling. */
 static void suffix_object(cJSON *prev,cJSON *item) {prev->next=item;item->prev=prev;}

cJSON.h

@@ -80,7 +80,7 @@ extern int	  cJSON_GetArraySize(cJSON *array);
 extern cJSON *cJSON_GetArrayItem(cJSON *array,int item);
 /* Get item "string" from object. Case insensitive. */
 extern cJSON *cJSON_GetObjectItem(cJSON *object,const char *string);
-
+extern int *cJSON_HasObjectItem(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);