5 if (at_resp_parse_line_args_by_kw()函数解析AT接受的地址

发布于 2023-03-28 10:00:05 浏览：348 订阅该版

之前在用AT组件包 实现WIFI、蓝牙功能的时候，联网需要先进行地址获取，因用的EC200模组和FC41的指令函数不同，所以我在设备初始化成功之后，新增任务去自动获取模组地址，通过AT+QGETIP指令，出现如下问题：
at反馈回来的地址显示为：包含两行，0D 0A为一行，很奇怪的回显方式
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230328/7fd8010c3e7d8de6edf2ccad1e9a2c38.png)
我无法用换行识别获取，所以我利用关键字匹配来获取地址，函数如下
```c
static void ec200x_get_netdev_info(struct rt_work *work, void *work_data)
{
#define AT_ADDR_LEN 32
#define EC200X_INFO_RESP_SIZE 128

at_response_t resp = RT_NULL;
    char ip[AT_ADDR_LEN] = {0};
    char gateway[AT_ADDR_LEN] = {0};
    char netmask[AT_ADDR_LEN] = {0};
    char dns[AT_ADDR_LEN] = {0};
    char mac[AT_ADDR_LEN] = {0};

ip_addr_t ip_addr;
    rt_uint32_t mac_addr[6] = {0};
    rt_uint32_t num = 0;
    // rt_uint32_t dhcp_stat = 0;
    // char dns_server1[AT_ADDR_LEN] = {0}, dns_server2[AT_ADDR_LEN] = {0};

struct at_device *device = (struct at_device *)work_data;
    struct netdev *netdev = device->netdev;
    struct at_client *client = device->client;
    rt_err_t result = RT_EOK;
    int retry_num = 3;

if (work != RT_NULL)
    {
        rt_free(work);
    }

resp = at_create_resp(EC200X_INFO_RESP_SIZE, 2, rt_tick_from_millisecond(1000));
    if (resp == RT_NULL)
    {
        LOG_E("no memory for resp create.");
        goto __exit;
    }
while (retry_num--)
    {
        at_obj_exec_cmd(device->client, resp, "AT+QGETIP=station");

if (at_resp_parse_line_args_by_kw(resp, "+QGETIP:","+QGETIP:ip:%[^\"],gate:%[^\"],mask:%[^\"],dns:%[^\"],%*s", 
        ip, gateway, netmask, dns) <= 0)
        {
            at_resp_parse_line_args_by_kw(resp,"+QGETIP:","+QGETIP:gate:%[^\"],%*s",gateway);
            at_resp_parse_line_args_by_kw(resp,"+QGETIP:","+QGETIP:ip:%[^\"],%*s",ip);

continue;
        }
        else
        {
            break;
        }
    }

if (retry_num < 0)
    {
        goto __exit;
    }

LOG_D("%s device primary ip address: %s", device->name, ip);
LOG_D("%s device primary gate address: %s", device->name, gateway);

inet_aton(ip, &ip_addr);
    netdev_low_level_set_ipaddr(netdev, &ip_addr);
    at_netif_refresh(&ip_addr, RT_NULL, RT_NULL); // 网卡写入IP地址

/* set netdev info */
    inet_aton(gateway, &ip_addr);
    netdev_low_level_set_gw(netdev, &ip_addr);
    at_netif_refresh(RT_NULL, RT_NULL, &ip_addr); // 网卡写入网关

inet_aton(netmask, &ip_addr);
    netdev_low_level_set_netmask(netdev, &ip_addr);
    at_netif_refresh(RT_NULL, &ip_addr, RT_NULL); // 网卡写入子网掩码

inet_aton(dns, &ip_addr);
    netdev_low_level_set_netmask(netdev, &ip_addr);
    at_netif_refresh(RT_NULL, &ip_addr, RT_NULL); // 网卡写入dns地址
 netdev_low_level_set_dhcp_status(netdev, RT_TRUE);

result = RT_EOK; // yuanyuan加入
__exit:
    if (resp)
    {
        at_delete_resp(resp);
    }
}
```
获取地址语句为：
```c
if (at_resp_parse_line_args_by_kw(resp, "+QGETIP:","+QGETIP:ip:%[^\"],gate:%[^\"],mask:%[^\"],dns:%[^\"],%*s", ip, gateway, netmask, dns) <= 0)
```

但最终的结果为：用了`%*s`，但，后面的回显还是没有屏蔽掉，并且所有的地址全部赋值给了IP
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230328/5b6ed8d2d003294c22a2eeae796cb1a0.png)

我想问一下，这样的地址要怎么获取，只能通过区字符串吗？