cJSON: 一个用c写的一个简单好用的JSON解析器
实例1: 创建一个简单的学生信息数组

 cJSON* pRoot = cJSON_CreateObject();
 cJSON* pArray = cJSON_CreateArray();
 cJSON_AddItemToObject(pRoot, "students_info", pArray);
 char* szOut = cJSON_Print(pRoot);
 cJSON* pItem = cJSON_CreateObject();
 cJSON_AddStringToObject(pItem, "name", "chenzhongjing");
 cJSON_AddStringToObject(pItem, "sex", "male");
 cJSON_AddNumberToObject(pItem, "age", 28);
 cJSON_AddItemToArray(pArray, pItem);
 pItem = cJSON_CreateObject();
 cJSON_AddStringToObject(pItem, "name", "fengxuan");
 cJSON_AddStringToObject(pItem, "sex", "male");
 cJSON_AddNumberToObject(pItem, "age", 24);
 cJSON_AddItemToArray(pArray, pItem);
 pItem = cJSON_CreateObject();
 cJSON_AddStringToObject(pItem, "name", "tuhui");
 cJSON_AddStringToObject(pItem, "sex", "male");
 cJSON_AddNumberToObject(pItem, "age", 22);
 cJSON_AddItemToArray(pArray, pItem);
 char* szJSON = cJSON_Print(pRoot);
 cJSON_Delete(pRoot);
 //free(szJSON);
 pRoot = cJSON_Parse(szJSON);
 pArray = cJSON_GetObjectItem(pRoot, "students_info");
 if (NULL == pArray)
 {
     return -1;
 }
 int iCount = cJSON_GetArraySize(pArray);
 for (int i = 0; i < iCount; ++i)
 {
     cJSON* pItem = cJSON_GetArrayItem(pArray, i);
     if (NULL == pItem)
     {
         continue;
     }
     string strName = cJSON_GetObjectItem(pItem, "name")->valuestring;
     string strSex = cJSON_GetObjectItem(pItem, "sex")->valuestring;
     int iAge = cJSON_GetObjectItem(pItem, "age")->valueint;
 }
 cJSON_Delete(pRoot);
 free(szJSON);

解析json字符串

	char* json = "{\"action\":{\"state\":3,\"data\":\"Hello\"}}";
	cJSON *root;
	cJSON *format;
	int value_int;
	char *value_string;
	root = cJSON_Parse(json); 
	format = cJSON_GetObjectItem(root,"action");
	value_int = cJSON_GetObjectItem(format,"state")->valueint;  
	value_string = cJSON_GetObjectItem(format,"data")->valuestring;
	cJSON_Delete(root);

cJson源码:cjson

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