C程式中資料封裝和解析也可以用到JSON,不過需要額外新增json.h庫

#include <json/json.h>
//用於儲存資料
int array_number;
char wifiname_user[100][100];
char encryption_user[100][100];
char signal_user[100][100];
char channel_user[100][100];

//解析json函式
int AnalyJson(char *data);
//修剪string函式
char *PruneString(char *Pstr);

int main()
{
   int status = AnalyJson(String);
   if(status != 0)
   {
     printf("Can't Json!");
     return -1;
   }
   for(j = 0;j < array_number;j++)
   {
     printf("%s",wifiname_user[j]);
   }
   return 0;
}
 

int AnalyJson(char *data)
{
//	printf("data is %s\n\n",data);
	//json資料集
	struct json_object *new_obj = NULL;
	//data資料域
	struct json_object *obj_array = NULL;
	//每一條資料
	struct json_object *array_string = NULL;
	//鍵值key
	struct json_object *string_wifiname , *string_encryption , *int_signal , *int_channel;
	//陣列個數計數
	int i;
	//資料集長度
	int len = strlen(data);
	//修剪字串
	char prune_wifiname[100] = {0};
	char prune_encryption[100] = {0};
	//char wifiname_str[100] = {0};

	//判斷資料長度，不符合長度，當錯誤資料處理
	if (len > 10)
	{
		//判斷資料是否完整
		//if((data[0] == '{') && (data[len-1] == '}'))
		if(data[0] == '{')
		{
			//將資料集轉json格式
			new_obj = json_tokener_parse(data);
			//判斷json格式是否正確
			if (is_error(new_obj))
			{
				printf("json格式錯誤!\n");
				//釋放new_obj
				json_object_put(new_obj);
			}
			else
			{
				//獲得key為name的值
				obj_array = json_object_object_get(new_obj,"data");
				//列印json_object型別
				//printf("data = %s\n",json_object_to_json_string(obj_array));
				//陣列個數
				array_number = json_object_array_length(obj_array);
				//printf("length = %d\n",array_number);
				//迴圈解析
				for (i = 0 ; i < array_number ; i++)
				{
					//取出每一條資料
					array_string = json_object_array_get_idx(obj_array,i);
					//printf("string_array %d is %s\n",i,json_object_to_json_string(array_string));
					//取鍵值對
					string_wifiname		= json_object_object_get(array_string,"wifiname");
					string_encryption	= json_object_object_get(array_string,"encryption");
					int_signal		= json_object_object_get(array_string,"signal");
					int_channel		= json_object_object_get(array_string,"channel");
					//寫入陣列中，儲存全域性
					sprintf(prune_wifiname,"%s",json_object_to_json_string(string_wifiname));
					sprintf(prune_encryption,"%s",json_object_to_json_string(string_encryption));

					sprintf(wifiname_user[i],"%s",PruneString(prune_wifiname));
					sprintf(encryption_user[i],"%s",PruneString(prune_encryption));
					sprintf(signal_user[i],"%s",json_object_to_json_string(int_signal));
					sprintf(channel_user[i],"%s",json_object_to_json_string(int_channel));
					
					json_object_put(array_string);
				}
				//釋放資料集
				json_object_put(obj_array);
				json_object_put(new_obj);
			}
		}
		else
		{
			printf("資料不完整！\n");
			return -1;
		}
	}
	else
	{
		printf("資料大小錯誤！\n");
		return -1;
	}
	return 0;
}


char *PruneString(char *Pstr)
{
	char *wifiname_str = (char *)malloc(100);

	int str_len = strlen(Pstr);
	int j;
	for (j = 0 ; j < str_len ; j++)
	{
		wifiname_str[j] = Pstr[j + 1];
	}
	wifiname_str[str_len - 2] = '\0';

//	printf("%s len = %d  -> %s\n",Pstr,str_len,wifiname_str);
	return wifiname_str;
}