EEPROM help on writing long data

Projects Programming
1

Hi, i have created a EEPROM write and read to store a userlist that consists of fingerid and employeeno

below are the codes that i use to read and write.

My problem is that when i write in the current address, it looks like the other address data that run before the upcoming data became random number.

struct strUsers {
  byte fingerid;
  long empid;
} user;

//The data is pass from the html inputs and the 200 and 400 address set is the slots i plan to use
void writeUser(byte fingerid, long empid)
{
  Serial.println("Writing User");
  EEPROM.write(200 + (int)fingerid, fingerid);
  EEPROMWritelong(400 + (int)fingerid, empid);

  EEPROM.commit();
}


void readUser()
{
  int a = 0;
  while (a <= 100)
  {
  byte checkfinger = EEPROM.read(200 + a);
  long checkemp = EEPROMReadlong(400 + a);   
  Serial.println("No." + (String)a + " " + (String)checkfinger +" "+ (String)checkemp);
    a++;
  }
}

below this is the helper code for EEPROM write/read long

void EEPROMWritelong(int address, long value)
      {
      byte four = (value & 0xFF);
      byte three = ((value >> 8) & 0xFF);
      byte two = ((value >> 16) & 0xFF);
      byte one = ((value >> 24) & 0xFF);

      //Write the 4 bytes into the eeprom memory.
      EEPROM.write(address, four);
      EEPROM.write(address + 1, three);
      EEPROM.write(address + 2, two);
      EEPROM.write(address + 3, one);
      }
long EEPROMReadlong(long address)
      {
      //Read the 4 bytes from the eeprom memory.
      long four = EEPROM.read(address);
      long three = EEPROM.read(address + 1);
      long two = EEPROM.read(address + 2);
      long one = EEPROM.read(address + 3);

      //Return the recomposed long by using bitshift.
      return ((four << 0) & 0xFF) + ((three << 8) & 0xFFFF) + ((two << 16) & 0xFFFFFF) + ((one << 24) & 0xFFFFFFFF);
}

below image is the sample output i get when i write it, the No.1 should be fingerid 1 and employeeid 9001 before i submit the No.2, but it somehow became random number for employeeid

2 
EEPROMWritelong(400 + (int)fingerid, empid);

if you're writing a 4 byte long, shouldn't the address be incrementing by 4?

EEPROMWritelong(400 + sizeof(long) * fingerid, empid);
3

...or you could use the EEPROM library's put and get methods.

4

gcjr:

EEPROMWritelong(400 + (int)fingerid, empid);

if you're writing a 4 byte long, shouldn't the address be incrementing by 4?

EEPROMWritelong(400 + sizeof(long) * fingerid, empid);

Thank you so much guys ! this one work, dang totally forgotten the basic.