C语言使用cjson解析下面数据{ "name": "sys", "type": "table", "data": [ { "name": "dbc_path", "type": "string", "data": "/usrdata/dbc/GB-EP40_CAN_r5_v1.0.dbc" }, { "name": "first_boot", "type": "unsigned", "data": "0" }, { "name": "configNet", "type": "group", "data": [ { "name": "privateApnAddress", "type": "string", "data": "www.qq.com" }, { "name": "publicApnAddress", "type": "string", "data": "172.0.0.1" }, { "name": "publicApnUserName", "type": "string", "data": "172.0.0.1" }, { "name": "publicApnPassword", "type": "string", "data": "172.0.0.1" }, { "name": "publicDnsAddress", "type": "string", "data": "172.0.0.1" }, { "name": "publicDNsAddressBak", "type": "string", "data": "172.0.0.1" } ] } ] }

可以使用cjson库来解析上述数据。首先需要将数据转换为一个字符串，然后使用cjson库中的函数来解析该字符串。

以下是一个示例代码：

#include <stdio.h>
#include <string.h>
#include "cJSON.h"

int main()
{
    // 数据字符串
    char* data_str = "{ \"name\": \"sys\", \"type\": \"table\", \"data\": [ { \"name\": \"dbc_path\", \"type\": \"string\", \"data\": \"/usrdata/dbc/GB-EP40_CAN_r5_v1.0.dbc\" }, { \"name\": \"first_boot\", \"type\": \"unsigned\", \"data\": \"0\" }, { \"name\": \"configNet\", \"type\": \"group\", \"data\": [ { \"name\": \"privateApnAddress\", \"type\": \"string\", \"data\": \"www.qq.com\" }, { \"name\": \"publicApnAddress\", \"type\": \"string\", \"data\": \"172.0.0.1\" }, { \"name\": \"publicApnUserName\", \"type\": \"string\", \"data\": \"172.0.0.1\" }, { \"name\": \"publicApnPassword\", \"type\": \"string\", \"data\": \"172.0.0.1\" }, { \"name\": \"publicDnsAddress\", \"type\": \"string\", \"data\": \"172.0.0.1\" }, { \"name\": \"publicDNsAddressBak\", \"type\": \"string\", \"data\": \"172.0.0.1\" } ] } ] }";

    // 解析数据字符串
    cJSON* json = cJSON_Parse(data_str);

    // 获取name字段的值
    cJSON* name_json = cJSON_GetObjectItem(json, "name");
    printf("name: %s\n", name_json->valuestring);

    // 获取data字段的值
    cJSON* data_json = cJSON_GetObjectItem(json, "data");

    // 遍历data数组
    cJSON* data_item_json = NULL;
    cJSON_ArrayForEach(data_item_json, data_json)
    {
        // 获取name字段的值
        cJSON* data_name_json = cJSON_GetObjectItem(data_item_json, "name");
        printf("data name: %s\n", data_name_json->valuestring);

        // 获取type字段的值
        cJSON* data_type_json = cJSON_GetObjectItem(data_item_json, "type");
        printf("data type: %s\n", data_type_json->valuestring);

        // 获取data字段的值
        cJSON* data_data_json = cJSON_GetObjectItem(data_item_json, "data");
        if (cJSON_IsArray(data_data_json))
        {
            // 遍历数据数组
            cJSON* data_data_item_json = NULL;
            cJSON_ArrayForEach(data_data_item_json, data_data_json)
            {
                // 获取name字段的值
                cJSON* data_data_name_json = cJSON_GetObjectItem(data_data_item_json, "name");
                printf("data data name: %s\n", data_data_name_json->valuestring);

                // 获取type字段的值
                cJSON* data_data_type_json = cJSON_GetObjectItem(data_data_item_json, "type");
                printf("data data type: %s\n", data_data_type_json->valuestring);

                // 获取data字段的值
                cJSON* data_data_data_json = cJSON_GetObjectItem(data_data_item_json, "data");
                printf("data data data: %s\n", data_data_data_json->valuestring);
            }
        }
        else
        {
            // 获取data字段的值
            cJSON* data_data_data_json = cJSON_GetObjectItem(data_item_json, "data");
            printf("data data: %s\n", data_data_data_json->valuestring);
        }
    }

    // 释放内存
    cJSON_Delete(json);

    return 0;
}

上述代码中，我们首先使用`cJSON_Parse`函数将数据字符串解析为一个`cJSON`对象。然后通过`cJSON_GetObjectItem`函数获取对象中的字段，并使用`cJSON_IsArray`函数判断该字段是否为一个数组。如果是数组，则使用`cJSON_ArrayForEach`函数遍历数组中的每个元素，获取元素中的字段的值。最后使用`cJSON_Delete`函数释放内存。