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千年破晓

json格式里的嵌套部分的数据应该怎么提取出来

比如这个  {"error_code":0,"error_msg":"SUCCESS","log_id":1012589256565,"timestamp":1632905469,"cached":0,"result":{"face_token":"879c7006f8af0c0d25b1da462c1","user_list":[{"group_id":"test01","user_id":"001","user_info":"","score":96.729072570801}]}}

我要提取这个"score" 里面的值怎么弄，下面是我写的，我只会提取没有嵌套的部分，嵌套的怎么提取出来

StaticJsonDocument<200> doc;
        DeserializationError error = deserializeJson(doc, response);
         if (error)
        {
          Serial.print(F("deserializeJson() failed: "));
          Serial.println(error.c_str());
        }

        const char* sensor = doc["error_msg"];
        //float fs = doc["result"]["user_list"][0]["score"];

XlinliY.Zhang

1. StaticJsonDocument<384> doc;
   
2. 
   
3. DeserializationError error = deserializeJson(doc, input);
   
4. 
   
5. if (error) {
   
6.   Serial.print(F("deserializeJson() failed: "));
   
7.   Serial.println(error.f_str());
   
8.   return;
   
9. }
   
10. 
    
11. int error_code = doc["error_code"]; // 0
    
12. const char* error_msg = doc["error_msg"]; // "SUCCESS"
    
13. long long log_id = doc["log_id"]; // 1012589256565
    
14. long timestamp = doc["timestamp"]; // 1632905469
    
15. int cached = doc["cached"]; // 0
    
16. 
    
17. const char* result_face_token = doc["result"]["face_token"]; // "879c7006f8af0c0d25b1da462c1"
    
18. 
    
19. JsonObject result_user_list_0 = doc["result"]["user_list"][0];
    
20. const char* result_user_list_0_group_id = result_user_list_0["group_id"]; // "test01"
    
21. const char* result_user_list_0_user_id = result_user_list_0["user_id"]; // "001"
    
22. const char* result_user_list_0_user_info = result_user_list_0["user_info"]; // nullptr
    
23. double result_user_list_0_score = result_user_list_0["score"]; // 96.729072570801

复制代码

千年破晓

XlinliY.Zhang 发表于 2021-9-29 21:18

谢谢大佬，问题解决了