cjson的基本使用

json:

{
    "test":	{
        "test1":	{
            "a":	1,
            "b":	2,
            "c":	3
        },
         "test2":	[4, 5, 6]
      }
}

代码：

解析
bool decodeJson(string jsonPath)
{
FILE *fp = fopen(jsonPath.c_str(), "r");
fseek(fp, 0, SEEK_END);
long len = ftell(fp);
fseek(fp, 0, SEEK_SET);
char *data = (char*)malloc(len + 1);
fread(data, 1, len, fp);
fclose(fp);


cJSON *root_json = cJSON_Parse(data);
if (NULL == root_json)
{
cout << cJSON_GetErrorPtr();
cJSON_Delete(root_json);
return false;
}


cJSON *test_json = cJSON_GetObjectItem(root_json, "test");


cJSON *test1_json = cJSON_GetObjectItem(test_json, "test1");
cJSON *temp = test1_json->child;
while (temp != NULL)
{
cout<
temp = temp->next;
}


cJSON *test2_array = cJSON_GetObjectItem(test_json, "test2");
int test2ArraySize = cJSON_GetArraySize(test2_array);
for (int i = 0; i < test2ArraySize; i++)
{
char *ch = cJSON_Print(cJSON_GetArrayItem(test2_array, i));
cout << string(ch);
free(ch);
}
cJSON_Delete(root_json);
cout << endl;
return true;
}

#生成
bool codeJson(string jsonPath)
{
cJSON *root_json,*test_json, *test1_json, *test2_array;


test1_json = cJSON_CreateObject();
cJSON_AddNumberToObject(test1_json, "a", 1);
cJSON_AddNumberToObject(test1_json, "b", 2);
cJSON_AddNumberToObject(test1_json, "c", 3);
test2_array = cJSON_CreateArray();
for (int i = 4; i <= 6; i++ )
{
cJSON_AddItemToArray(test2_array, cJSON_CreateNumber(i));
}


test_json = cJSON_CreateObject();
cJSON_AddItemToObject(test_json, "test1", test1_json);
cJSON_AddItemToObject(test_json, "test2", test2_array);


root_json = cJSON_CreateObject();
cJSON_AddItemToObject(root_json, "test", test_json);


cout << string(cJSON_Print(root_json));
FILE *fp = fopen(jsonPath.c_str(), "w");
fputs(cJSON_Print(root_json), fp);
fclose(fp);
cJSON_Delete(root_json);
return true;
}