标签:arduino doc print json 测试 47 println 40.786 Serial
源程序
1 #include <ArduinoJson.h> 2 String st1,st2,st3; 3 4 const char* cc1; 5 const char* cc2; 6 const char* cc3; 7 int in1,in2,in3,in4; 8 void setup() { 9 10 Serial.begin(115200); 11 12 DynamicJsonDocument doc(1024); 13 14 // WARNING: the string in the input will be duplicated in the JsonDocument. 15 String input = "{\"sensor\":\"gps\",\"time\":1351824120,\"data\":\"10\"}"; 16 deserializeJson(doc, input); 17 JsonObject obj = doc.as<JsonObject>(); 18 19 // You can use a String to get an element of a JsonObject 20 // No duplication is done. 21 long time = obj[String("time")]; 22 // 23 //st1=doc["sensor"]; //此句编译不通过,可用以下两句代替,String 对象声明时可用json赋初值,之后不可以;或可采用下面第3句的方法 24 String sensor = doc["sensor"]; 25 st1=sensor; 26 27 st2=doc["data"].as<String>(); 28 st3=doc["time"].as<String>(); 29 30 cc1=doc["sensor"]; 31 cc2=doc["data"]; 32 cc3=doc["time"]; 33 34 in1=doc["time"].as<int>(); 35 in2=doc["time"]; 36 in3=doc["data"].as<int>(); 37 in4=doc["data"]; 38 Serial.println(); 39 Serial.print("st1:"); Serial.println(st1); 40 Serial.print("st2:"); Serial.println(st2); 41 Serial.print("st3:"); Serial.println(st3); 42 Serial.print("cc1:"); Serial.println(cc1); 43 Serial.print("cc2:"); Serial.println(cc2); 44 Serial.print("cc3:"); Serial.println(cc3); 45 Serial.print("in1:"); Serial.println(in1,10); 46 Serial.print("in2:"); Serial.println(in2,10); 47 Serial.print("in3:"); Serial.println(in3,10); 48 Serial.print("in4:"); Serial.println(in4,10); 49 50 double latitude = doc["data"][0]; 51 double longitude = doc["data"][1]; 52 53 // Print values. 54 Serial.println(sensor); 55 Serial.println(time); 56 Serial.println(latitude, 6); 57 Serial.println(longitude, 6); 58 59 obj["sensor"] = "new gps"; 60 obj["code"] = 200; 61 // Lastly, you can print the resulting JSON to a String 62 String output; 63 serializeJson(doc, output); 64 65 Serial.println(output); 66 } 67 68 void loop() { 69 // not used in this example 70 }View Code
串口输出:
16:47:40.786 -> st1:gps
16:47:40.786 -> st2:10
16:47:40.786 -> st3:1351824120
16:47:40.786 -> cc1:gps
16:47:40.786 -> cc2:10
16:47:40.786 -> cc3:
16:47:40.786 -> in1:1351824120
16:47:40.786 -> in2:1351824120
16:47:40.786 -> in3:10
16:47:40.786 -> in4:10
16:47:40.786 -> gps
16:47:40.786 -> 1351824120
16:47:40.786 -> 0.000000
16:47:40.786 -> 0.000000
16:47:40.786 -> {"sensor":"new gps","time":1351824120,"data":"10","code":200}
标签:arduino,doc,print,json,测试,47,println,40.786,Serial 来源: https://www.cnblogs.com/chengwh/p/16289191.html
本站声明: 1. iCode9 技术分享网(下文简称本站)提供的所有内容,仅供技术学习、探讨和分享; 2. 关于本站的所有留言、评论、转载及引用,纯属内容发起人的个人观点,与本站观点和立场无关; 3. 关于本站的所有言论和文字,纯属内容发起人的个人观点,与本站观点和立场无关; 4. 本站文章均是网友提供,不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属;如您发现该文章侵犯了您的权益,可联系我们第一时间进行删除; 5. 本站为非盈利性的个人网站,所有内容不会用来进行牟利,也不会利用任何形式的广告来间接获益,纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。