sscanf 提取AT命令返回结果中的有效数据

C语言 | 如何使用 sscanf 提取AT命令返回结果中的有效数据 - 云+社区 - 腾讯云 (tencent.com)

 

正则表达式提取不定长字符

AT命令返回结果为：

1 +CWLAP:(4,"TP-LINK_PocketAP_DFBCD4",-57,"38:83:45:df:bc:d4",6)
2 +CWLAP:(3,"LSTM",-61,"8c:21:0a:bc:8e:70",13)
3 +CWLAP:(3,"LabWiFi",-62,"68:3b:78:8f:16:23",1)
4 +CWLAP:(0,"GuestWiFi",-64,"68:3b:78:8f:16:22",1)
5 
6 OK

先找到+CWLAP：

 1 strstr(buffer+offset, "+CWLAP:"); 

使用sscanf+正则表达式提取ssid、mac、rssi：

 1 sscanf(str+strlen("+CWLAP:"), "(%d,\"%[^\"]\",%d,\"%[^\"]\",", &ecn, ssid, &rssi, mac); 

读取之后，将str指针移动到该行结束，进行下一轮的查找：

 1 while (*str++ != '\n') { 2 offset++; 3 } 

 

sscanf函数用法详解

 测试

 1 #include <stdio.h>
 2 #include <string.h>
 3 #include <iostream>
 4 char* str = 
 5 "+CWLAP:(4,\"TP-LINK_PocketAP_DFBCD4\",-57,\"38:83:45:df:bc:d4\",6)\r\n\
 6 +CWLAP:(3,\"LSTM\",-61,\"8c:21:0a:bc:8e:70\",13)\r\n\
 7 +CWLAP:(3,\"LabWiFi\",-62,\"68:3b:78:8f:16:23\",1)\r\n\
 8 +CWLAP:(0,\"GuestWiFi\",-64,\"68:3b:78:8f:16:22\",1)\r\n\
 9 \r\n\
10 OK\r\n";
11 
12 int ecn;
13 char ssid[32];
14 int rssi;
15 char mac[32];
16 int channel; 
17 char* ptr = NULL;
18 int offset = 0;
19 int main()
20 {
21     while(1){
22         ptr = strstr(str+offset,"+CWLAP");
23         if(!ptr)break;
24         sscanf(ptr,"+CWLAP:(%d,\"%[^\"]\",%d,\"%[^\"]\",%d",&ecn, ssid, &rssi, mac,&channel);
25         printf(" ecn = %d\r\n ssid =%s\r\n rssi =%d\r\n mac =%s\r\n channel = %d\r\n",ecn, ssid, rssi, mac,channel);
26         printf("==========================\r\n");
27         while (*ptr++ != '\n') 
28         {  
29             offset++; 
30         }
31     }
32     system("pause");
33     return 0;
34 
35 }

 

posted @ 2021-12-25 00:04  M&D  阅读(520)  评论(0)  编辑  收藏  举报