Arduino std::map returning random values

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I'm working with an arduino UNO. I would like to be able to send it set and get commands over serial and have it update class data class members accordingly by key value pair. I spoke to users in the cpp room, and they suggested I try using map to map every key to value.



command structure
command:key:value



ex. set:key1:20
ex. get:key2



I created a class called Uno, assigned all my keys to private data members, and defined set and get functions. However, I am experiencing unintended behavior.



Unintended behavior
The set function ends up setting key1 and key2 to the same value, and the get function returns a random integer value that wasn't assigned. 



 #include <ArduinoSTL.h>
 #include <string.h>
 #include <map>

class Uno
 //private
 int key1;
 int key2;
 std::map<String, int Uno::*> keys;
 public:
 //Constructor
 Uno()
 key1 = 0;
 key2 = 0;
 keys["key1"] = &Uno::key1;
 keys["key2"] = &Uno::key2;
 
 bool setKey(String key, int value)
 if (keys.count(key)) 
 this->*keys[key] = value;
 return true;
 
 return false;
 
 int getKey(String key)
 if (keys.count(key)) 
 return this->*keys[key];
 
 
;


String inputString = ""; // a String to hold incoming data
bool stringComplete = false; // whether the string is complete
bool scan = false; // whether a scan is in progress
Uno myMS; // global declaration of Mass Spec Class

void setup() 
 // initialize serial:
 Serial.begin(9600);
 // reserve 250 bytes for the inputString:
 inputString.reserve(250);


void loop() 
 if (stringComplete) 
 t(inputString); // tokenize and process string

 //RESET STRING
 inputString = "";
 stringComplete = false;
 



void serialEvent() 
 while (Serial.available()) 
 // get the new byte:
 char inChar = (char)Serial.read();
 // add it to the inputString:
 inputString += inChar;
 // if the incoming character is a newline, set a flag so the main loop can
 // do something about it:
 if (inChar == 'n') 
 stringComplete = true;
 
 




void t(String inputString) 
 //get command
 String command = getValue(inputString, ':', 0);

 if(command == "set")
 // get key, get value
 String key = getValue(inputString, ':', 1);
 int value = (getValue(inputString, ':', 2)).toInt();
 Serial.println(myMS.setKey(key,value));
 
 else if(command == "get")
 String key = getValue(inputString, ':', 1);
 int value = myMS.getKey(key);
 Serial.println(value);
 
 else if(command == "stop")
 scan = false; 
 
 else if(command == "scan")
 scan = true;
 while(scan)
// Serial.println(myMS.scan());
 
 
 else
 Serial.println("not recognized");
 



String getValue(String data, char separator, int index)

 int found = 0;
 int strIndex = 0, -1;
 int maxIndex = data.length()-1;

 for(int i=0; i<=maxIndex && found<=index; i++) i==maxIndex)
 found++;
 strIndex[0] = strIndex[1]+1;
 strIndex[1] = (i == maxIndex) ? i+1 : i;
 
 
 return found>index ? data.substring(strIndex[0], strIndex[1]) : "";



EDIT: Here is a REPL IT working demo of concept provided by nwp.
https://repl.it/repls/AntiqueProductiveMineral



Sample output



set:key1:10 ===> 1 (GOOD)
get:key1 ===> 32512





c++ map







share|improve this question









New contributor




ex080 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.



















  • why do you think that this is an Arduino question? ... it appears to be a C/C++ question
    – jsotola
    3 hours ago






  • 1




    @jsotola It is an arduino question, because I am running the code on the arduino using the arduino String type. I am also using Serial on the arduino. I'm open to other arduino methods for storing key value pairs.
    – ex080
    3 hours ago











  • the 32512 is the return value of getKey if it didn't found the key
    – Juraj
    1 hour ago










  • Ok, but that is confusing because I am using the same method to set. I know the set function is working correctly, because if I do Serial.println(key1); from inside the class it prints the correct value.
    – ex080
    1 hour ago














up vote
2
down vote

favorite












I'm working with an arduino UNO. I would like to be able to send it set and get commands over serial and have it update class data class members accordingly by key value pair. I spoke to users in the cpp room, and they suggested I try using map to map every key to value.



command structure
command:key:value



ex. set:key1:20
ex. get:key2



I created a class called Uno, assigned all my keys to private data members, and defined set and get functions. However, I am experiencing unintended behavior.



Unintended behavior
The set function ends up setting key1 and key2 to the same value, and the get function returns a random integer value that wasn't assigned. 



 #include <ArduinoSTL.h>
 #include <string.h>
 #include <map>

class Uno
 //private
 int key1;
 int key2;
 std::map<String, int Uno::*> keys;
 public:
 //Constructor
 Uno()
 key1 = 0;
 key2 = 0;
 keys["key1"] = &Uno::key1;
 keys["key2"] = &Uno::key2;
 
 bool setKey(String key, int value)
 if (keys.count(key)) 
 this->*keys[key] = value;
 return true;
 
 return false;
 
 int getKey(String key)
 if (keys.count(key)) 
 return this->*keys[key];
 
 
;


String inputString = ""; // a String to hold incoming data
bool stringComplete = false; // whether the string is complete
bool scan = false; // whether a scan is in progress
Uno myMS; // global declaration of Mass Spec Class

void setup() 
 // initialize serial:
 Serial.begin(9600);
 // reserve 250 bytes for the inputString:
 inputString.reserve(250);


void loop() 
 if (stringComplete) 
 t(inputString); // tokenize and process string

 //RESET STRING
 inputString = "";
 stringComplete = false;
 



void serialEvent() 
 while (Serial.available()) 
 // get the new byte:
 char inChar = (char)Serial.read();
 // add it to the inputString:
 inputString += inChar;
 // if the incoming character is a newline, set a flag so the main loop can
 // do something about it:
 if (inChar == 'n') 
 stringComplete = true;
 
 




void t(String inputString) 
 //get command
 String command = getValue(inputString, ':', 0);

 if(command == "set")
 // get key, get value
 String key = getValue(inputString, ':', 1);
 int value = (getValue(inputString, ':', 2)).toInt();
 Serial.println(myMS.setKey(key,value));
 
 else if(command == "get")
 String key = getValue(inputString, ':', 1);
 int value = myMS.getKey(key);
 Serial.println(value);
 
 else if(command == "stop")
 scan = false; 
 
 else if(command == "scan")
 scan = true;
 while(scan)
// Serial.println(myMS.scan());
 
 
 else
 Serial.println("not recognized");
 



String getValue(String data, char separator, int index)

 int found = 0;
 int strIndex = 0, -1;
 int maxIndex = data.length()-1;

 for(int i=0; i<=maxIndex && found<=index; i++) i==maxIndex)
 found++;
 strIndex[0] = strIndex[1]+1;
 strIndex[1] = (i == maxIndex) ? i+1 : i;
 
 
 return found>index ? data.substring(strIndex[0], strIndex[1]) : "";



EDIT: Here is a REPL IT working demo of concept provided by nwp.
https://repl.it/repls/AntiqueProductiveMineral



Sample output



set:key1:10 ===> 1 (GOOD)
get:key1 ===> 32512





c++ map







share|improve this question









New contributor




ex080 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.



















  • why do you think that this is an Arduino question? ... it appears to be a C/C++ question
    – jsotola
    3 hours ago






  • 1




    @jsotola It is an arduino question, because I am running the code on the arduino using the arduino String type. I am also using Serial on the arduino. I'm open to other arduino methods for storing key value pairs.
    – ex080
    3 hours ago











  • the 32512 is the return value of getKey if it didn't found the key
    – Juraj
    1 hour ago










  • Ok, but that is confusing because I am using the same method to set. I know the set function is working correctly, because if I do Serial.println(key1); from inside the class it prints the correct value.
    – ex080
    1 hour ago












up vote
2
down vote

favorite









up vote
2
down vote

favorite











I'm working with an arduino UNO. I would like to be able to send it set and get commands over serial and have it update class data class members accordingly by key value pair. I spoke to users in the cpp room, and they suggested I try using map to map every key to value.



command structure
command:key:value



ex. set:key1:20
ex. get:key2



I created a class called Uno, assigned all my keys to private data members, and defined set and get functions. However, I am experiencing unintended behavior.



Unintended behavior
The set function ends up setting key1 and key2 to the same value, and the get function returns a random integer value that wasn't assigned. 



 #include <ArduinoSTL.h>
 #include <string.h>
 #include <map>

class Uno
 //private
 int key1;
 int key2;
 std::map<String, int Uno::*> keys;
 public:
 //Constructor
 Uno()
 key1 = 0;
 key2 = 0;
 keys["key1"] = &Uno::key1;
 keys["key2"] = &Uno::key2;
 
 bool setKey(String key, int value)
 if (keys.count(key)) 
 this->*keys[key] = value;
 return true;
 
 return false;
 
 int getKey(String key)
 if (keys.count(key)) 
 return this->*keys[key];
 
 
;


String inputString = ""; // a String to hold incoming data
bool stringComplete = false; // whether the string is complete
bool scan = false; // whether a scan is in progress
Uno myMS; // global declaration of Mass Spec Class

void setup() 
 // initialize serial:
 Serial.begin(9600);
 // reserve 250 bytes for the inputString:
 inputString.reserve(250);


void loop() 
 if (stringComplete) 
 t(inputString); // tokenize and process string

 //RESET STRING
 inputString = "";
 stringComplete = false;
 



void serialEvent() 
 while (Serial.available()) 
 // get the new byte:
 char inChar = (char)Serial.read();
 // add it to the inputString:
 inputString += inChar;
 // if the incoming character is a newline, set a flag so the main loop can
 // do something about it:
 if (inChar == 'n') 
 stringComplete = true;
 
 




void t(String inputString) 
 //get command
 String command = getValue(inputString, ':', 0);

 if(command == "set")
 // get key, get value
 String key = getValue(inputString, ':', 1);
 int value = (getValue(inputString, ':', 2)).toInt();
 Serial.println(myMS.setKey(key,value));
 
 else if(command == "get")
 String key = getValue(inputString, ':', 1);
 int value = myMS.getKey(key);
 Serial.println(value);
 
 else if(command == "stop")
 scan = false; 
 
 else if(command == "scan")
 scan = true;
 while(scan)
// Serial.println(myMS.scan());
 
 
 else
 Serial.println("not recognized");
 



String getValue(String data, char separator, int index)

 int found = 0;
 int strIndex = 0, -1;
 int maxIndex = data.length()-1;

 for(int i=0; i<=maxIndex && found<=index; i++) i==maxIndex)
 found++;
 strIndex[0] = strIndex[1]+1;
 strIndex[1] = (i == maxIndex) ? i+1 : i;
 
 
 return found>index ? data.substring(strIndex[0], strIndex[1]) : "";



EDIT: Here is a REPL IT working demo of concept provided by nwp.
https://repl.it/repls/AntiqueProductiveMineral



Sample output



set:key1:10 ===> 1 (GOOD)
get:key1 ===> 32512





c++ map







share|improve this question









New contributor




ex080 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











I'm working with an arduino UNO. I would like to be able to send it set and get commands over serial and have it update class data class members accordingly by key value pair. I spoke to users in the cpp room, and they suggested I try using map to map every key to value.



command structure
command:key:value



ex. set:key1:20
ex. get:key2



I created a class called Uno, assigned all my keys to private data members, and defined set and get functions. However, I am experiencing unintended behavior.



Unintended behavior
The set function ends up setting key1 and key2 to the same value, and the get function returns a random integer value that wasn't assigned. 



 #include <ArduinoSTL.h>
 #include <string.h>
 #include <map>

class Uno
 //private
 int key1;
 int key2;
 std::map<String, int Uno::*> keys;
 public:
 //Constructor
 Uno()
 key1 = 0;
 key2 = 0;
 keys["key1"] = &Uno::key1;
 keys["key2"] = &Uno::key2;
 
 bool setKey(String key, int value)
 if (keys.count(key)) 
 this->*keys[key] = value;
 return true;
 
 return false;
 
 int getKey(String key)
 if (keys.count(key)) 
 return this->*keys[key];
 
 
;


String inputString = ""; // a String to hold incoming data
bool stringComplete = false; // whether the string is complete
bool scan = false; // whether a scan is in progress
Uno myMS; // global declaration of Mass Spec Class

void setup() 
 // initialize serial:
 Serial.begin(9600);
 // reserve 250 bytes for the inputString:
 inputString.reserve(250);


void loop() 
 if (stringComplete) 
 t(inputString); // tokenize and process string

 //RESET STRING
 inputString = "";
 stringComplete = false;
 



void serialEvent() 
 while (Serial.available()) 
 // get the new byte:
 char inChar = (char)Serial.read();
 // add it to the inputString:
 inputString += inChar;
 // if the incoming character is a newline, set a flag so the main loop can
 // do something about it:
 if (inChar == 'n') 
 stringComplete = true;
 
 




void t(String inputString) 
 //get command
 String command = getValue(inputString, ':', 0);

 if(command == "set")
 // get key, get value
 String key = getValue(inputString, ':', 1);
 int value = (getValue(inputString, ':', 2)).toInt();
 Serial.println(myMS.setKey(key,value));
 
 else if(command == "get")
 String key = getValue(inputString, ':', 1);
 int value = myMS.getKey(key);
 Serial.println(value);
 
 else if(command == "stop")
 scan = false; 
 
 else if(command == "scan")
 scan = true;
 while(scan)
// Serial.println(myMS.scan());
 
 
 else
 Serial.println("not recognized");
 



String getValue(String data, char separator, int index)

 int found = 0;
 int strIndex = 0, -1;
 int maxIndex = data.length()-1;

 for(int i=0; i<=maxIndex && found<=index; i++) i==maxIndex)
 found++;
 strIndex[0] = strIndex[1]+1;
 strIndex[1] = (i == maxIndex) ? i+1 : i;
 
 
 return found>index ? data.substring(strIndex[0], strIndex[1]) : "";



EDIT: Here is a REPL IT working demo of concept provided by nwp.
https://repl.it/repls/AntiqueProductiveMineral



Sample output



set:key1:10 ===> 1 (GOOD)
get:key1 ===> 32512





c++ map




c++ map






share|improve this question









New contributor




ex080 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




ex080 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 4 hours ago





















New contributor




ex080 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked 4 hours ago









ex080

112




112




New contributor




ex080 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





ex080 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






ex080 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











  • why do you think that this is an Arduino question? ... it appears to be a C/C++ question
    – jsotola
    3 hours ago






  • 1




    @jsotola It is an arduino question, because I am running the code on the arduino using the arduino String type. I am also using Serial on the arduino. I'm open to other arduino methods for storing key value pairs.
    – ex080
    3 hours ago











  • the 32512 is the return value of getKey if it didn't found the key
    – Juraj
    1 hour ago










  • Ok, but that is confusing because I am using the same method to set. I know the set function is working correctly, because if I do Serial.println(key1); from inside the class it prints the correct value.
    – ex080
    1 hour ago
















  • why do you think that this is an Arduino question? ... it appears to be a C/C++ question
    – jsotola
    3 hours ago






  • 1




    @jsotola It is an arduino question, because I am running the code on the arduino using the arduino String type. I am also using Serial on the arduino. I'm open to other arduino methods for storing key value pairs.
    – ex080
    3 hours ago











  • the 32512 is the return value of getKey if it didn't found the key
    – Juraj
    1 hour ago










  • Ok, but that is confusing because I am using the same method to set. I know the set function is working correctly, because if I do Serial.println(key1); from inside the class it prints the correct value.
    – ex080
    1 hour ago















why do you think that this is an Arduino question? ... it appears to be a C/C++ question
– jsotola
3 hours ago




why do you think that this is an Arduino question? ... it appears to be a C/C++ question
– jsotola
3 hours ago




1




1




@jsotola It is an arduino question, because I am running the code on the arduino using the arduino String type. I am also using Serial on the arduino. I'm open to other arduino methods for storing key value pairs.
– ex080
3 hours ago





@jsotola It is an arduino question, because I am running the code on the arduino using the arduino String type. I am also using Serial on the arduino. I'm open to other arduino methods for storing key value pairs.
– ex080
3 hours ago













the 32512 is the return value of getKey if it didn't found the key
– Juraj
1 hour ago




the 32512 is the return value of getKey if it didn't found the key
– Juraj
1 hour ago












Ok, but that is confusing because I am using the same method to set. I know the set function is working correctly, because if I do Serial.println(key1); from inside the class it prints the correct value.
– ex080
1 hour ago




Ok, but that is confusing because I am using the same method to set. I know the set function is working correctly, because if I do Serial.println(key1); from inside the class it prints the correct value.
– ex080
1 hour ago










1 Answer
1






active

oldest

votes

















up vote
3
down vote













You set CR/LF in Serial Monitor and you test n as end of line in code. and/or you attach the n char to the end of key. The rn or n is parsed/attached to key. The key for get is the "key1rn" or "key1r"



void serialEvent() 
 while (Serial.available()) 
 // get the new byte:
 char inChar = (char)Serial.read();
 if (inChar == 'n') 
 stringComplete = true;
 else 
 inputString += inChar;



there are obsolete things in your code, like the this->* or Uno::






share|improve this answer






















  • I have Newline only and it's not working anyways
    – KIIV
    30 mins ago










  • change the serialEvent to not to attach the n to the string
    – Juraj
    29 mins ago










  • Right, he's not skipping it in that parser :D
    – KIIV
    23 mins ago










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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
3
down vote













You set CR/LF in Serial Monitor and you test n as end of line in code. and/or you attach the n char to the end of key. The rn or n is parsed/attached to key. The key for get is the "key1rn" or "key1r"



void serialEvent() 
 while (Serial.available()) 
 // get the new byte:
 char inChar = (char)Serial.read();
 if (inChar == 'n') 
 stringComplete = true;
 else 
 inputString += inChar;



there are obsolete things in your code, like the this->* or Uno::






share|improve this answer






















  • I have Newline only and it's not working anyways
    – KIIV
    30 mins ago










  • change the serialEvent to not to attach the n to the string
    – Juraj
    29 mins ago










  • Right, he's not skipping it in that parser :D
    – KIIV
    23 mins ago














up vote
3
down vote













You set CR/LF in Serial Monitor and you test n as end of line in code. and/or you attach the n char to the end of key. The rn or n is parsed/attached to key. The key for get is the "key1rn" or "key1r"



void serialEvent() 
 while (Serial.available()) 
 // get the new byte:
 char inChar = (char)Serial.read();
 if (inChar == 'n') 
 stringComplete = true;
 else 
 inputString += inChar;



there are obsolete things in your code, like the this->* or Uno::






share|improve this answer






















  • I have Newline only and it's not working anyways
    – KIIV
    30 mins ago










  • change the serialEvent to not to attach the n to the string
    – Juraj
    29 mins ago










  • Right, he's not skipping it in that parser :D
    – KIIV
    23 mins ago












up vote
3
down vote










up vote
3
down vote









You set CR/LF in Serial Monitor and you test n as end of line in code. and/or you attach the n char to the end of key. The rn or n is parsed/attached to key. The key for get is the "key1rn" or "key1r"



void serialEvent() 
 while (Serial.available()) 
 // get the new byte:
 char inChar = (char)Serial.read();
 if (inChar == 'n') 
 stringComplete = true;
 else 
 inputString += inChar;



there are obsolete things in your code, like the this->* or Uno::






share|improve this answer














You set CR/LF in Serial Monitor and you test n as end of line in code. and/or you attach the n char to the end of key. The rn or n is parsed/attached to key. The key for get is the "key1rn" or "key1r"



void serialEvent() 
 while (Serial.available()) 
 // get the new byte:
 char inChar = (char)Serial.read();
 if (inChar == 'n') 
 stringComplete = true;
 else 
 inputString += inChar;



there are obsolete things in your code, like the this->* or Uno::







share|improve this answer














share|improve this answer



share|improve this answer








edited 23 mins ago

























answered 38 mins ago









Juraj

3,8842517




3,8842517











  • I have Newline only and it's not working anyways
    – KIIV
    30 mins ago










  • change the serialEvent to not to attach the n to the string
    – Juraj
    29 mins ago










  • Right, he's not skipping it in that parser :D
    – KIIV
    23 mins ago
















  • I have Newline only and it's not working anyways
    – KIIV
    30 mins ago










  • change the serialEvent to not to attach the n to the string
    – Juraj
    29 mins ago










  • Right, he's not skipping it in that parser :D
    – KIIV
    23 mins ago















I have Newline only and it's not working anyways
– KIIV
30 mins ago




I have Newline only and it's not working anyways
– KIIV
30 mins ago












change the serialEvent to not to attach the n to the string
– Juraj
29 mins ago




change the serialEvent to not to attach the n to the string
– Juraj
29 mins ago












Right, he's not skipping it in that parser :D
– KIIV
23 mins ago




Right, he's not skipping it in that parser :D
– KIIV
23 mins ago










ex080 is a new contributor. Be nice, and check out our Code of Conduct.









 

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What does second last employer means? [closed]

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Clash Royale CLAN TAG #URR8PPP .everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty margin-bottom:0; up vote -3 down vote favorite Say, for example I have worked in the following companies, Company A => 2010 - 2011 Company B => 2011 - 2012 Company C => 2012 - Till Date Company D => Have offer Now assume Company D is asking to submit documents from my second last employer. So from the list of companies given, which company would be qualified as second last employer? software-industry employer share | improve this question asked Aug 10 '14 at 5:16 Rajaprabhu Aravindasamy 559 1 6 13 closed as off-topic by Jim G., jmort253 ♦ Aug 11 '14 at 1:58 This question appears to be off-topic. The users who voted to close gave this specific reason: "Questions seeking advice on company-specific regulations, agreements, or policies should be directed to your manager or HR department. Questions that address...
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Installing NextGIS Connect into QGIS 3?

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Clash Royale CLAN TAG #URR8PPP .everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty margin-bottom:0; up vote 1 down vote favorite Just acquired free version of NEXTGIS and trying to install the plugin for QGIS. It tells me it was not designed for version 3 of QGIS. How do I set up the QGIS-NEXTGIS interface then? qgis qgis-plugins nextgis share | improve this question edited 3 hours ago PolyGeo ♦ 51.9k 17 77 233 asked 4 hours ago IanGS 16 4 New contributor IanGS is a new contributor to this site. Take care in asking for clarification, commenting, and answering. Check out our Code of Conduct. add a comment  |  up vote 1 down vote favorite Just acquired free version of NEXTGIS and trying to install the plugin for QGIS. It tells me it was not designed for version 3 of QGIS. How do I set up the QGIS-NEXTGIS interface then? qgis qgis-plugin...
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One-line joke

A one-liner is a joke that is delivered in a single line. A good one-liner is said to be pithy - concise and meaningful. [1] Comedians and actors use this comedic method as part of their act, e.g. Jimmy Carr, Tommy Cooper, Rodney Dangerfield, Norm Macdonald, Ken Dodd, Stewart Francis, Zach Galifianakis, Mitch Hedberg, Anthony Jeselnik, Milton Jones, Shappi Khorsandi, Jay London, Mark Linn-Baker, Demetri Martin, Groucho Marx, Dan Mintz, Emo Philips, Tim Vine, Steven Wright and Henny Youngman and Arnold Schwarzenegger. [ citation needed ] Many fictional characters are also known to deliver one-liners, including James Bond, who usually includes pithy and laconic quips after disposing of a villain. [ citation needed ] Examples "A baby seal walks into a club." "A dyslexic man walks into a bra." (Anonymous) "There are three types of people, those who can count and those who can't." "Venison's dear, isn't it?" (Jimmy Carr) "An escala...
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